WO2010008010A1 - Hcv/gbv-bキメラウイルス - Google Patents
Hcv/gbv-bキメラウイルス Download PDFInfo
- Publication number
- WO2010008010A1 WO2010008010A1 PCT/JP2009/062786 JP2009062786W WO2010008010A1 WO 2010008010 A1 WO2010008010 A1 WO 2010008010A1 JP 2009062786 W JP2009062786 W JP 2009062786W WO 2010008010 A1 WO2010008010 A1 WO 2010008010A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rna
- hcv
- protein
- gbv
- chimeric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/005—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from viruses
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N7/00—Viruses; Bacteriophages; Compositions thereof; Preparation or purification thereof
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2770/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses positive-sense
- C12N2770/00011—Details
- C12N2770/24011—Flaviviridae
- C12N2770/24211—Hepacivirus, e.g. hepatitis C virus, hepatitis G virus
- C12N2770/24221—Viruses as such, e.g. new isolates, mutants or their genomic sequences
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2770/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses positive-sense
- C12N2770/00011—Details
- C12N2770/24011—Flaviviridae
- C12N2770/24211—Hepacivirus, e.g. hepatitis C virus, hepatitis G virus
- C12N2770/24222—New viral proteins or individual genes, new structural or functional aspects of known viral proteins or genes
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2770/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses positive-sense
- C12N2770/00011—Details
- C12N2770/24011—Flaviviridae
- C12N2770/24211—Hepacivirus, e.g. hepatitis C virus, hepatitis G virus
- C12N2770/24241—Use of virus, viral particle or viral elements as a vector
- C12N2770/24243—Use of virus, viral particle or viral elements as a vector viral genome or elements thereof as genetic vector
Definitions
- the present invention relates to a chimeric RNA of hepatitis C virus (hereinafter sometimes referred to as “HCV”) and GB virus B (hereinafter sometimes referred to as “GBV-B”) and a chimeric virus comprising the chimeric RNA.
- HCV hepatitis C virus
- GBV-B GB virus B
- HCV is a causative factor of chronic hepatitis C, and according to WHO statistics, it is estimated that there are 1.7 billion infected people worldwide.
- HCV is a virus classified into the Flaviviridae family and the genus Flavivirus, and is considered to infect via blood and blood components and to proliferate in the liver.
- Infected individuals with HCV only cause relatively minor symptoms in the early stages of infection, but become chronic at a high frequency and develop chronic hepatitis after a certain period of asymptomatic period. And as the infection lasts longer, the condition worsens to cirrhosis and frequently leads to liver cancer.
- Hepatitis virus is involved in 95% of liver cancers, 80% of which are thought to be due to HCV infection.
- HCV has a plus-strand RNA of about 9600 bases as a genome, and it is presumed that at least 6 types of genotypes exist from the analysis of gene sequences.
- the genome of about 9600 bases functions as mRNA in the host cell after infection, a continuous polyprotein of about 3000 amino acids in length is synthesized, and encoded by the host signal peptidase, signal peptidyl peptidase, and HCV genome Cleaved by protease.
- 10 types of proteins core (core), E1, E2, p7, NS2, NS3, NS4A, NS4B, NS5A, and NS5B are produced.
- an untranslated region is present at the 5 'end and 3' end, and is responsible for translational regulation and genome replication regulation.
- the cores, E1 and E2 are structural proteins constituting the virus, and the viral genome is packaged by the core protein, forms a capsid, is surrounded by E1 and E2 coat proteins anchored to the lipid bilayer, and virus particles ( Virion).
- the function of p7 is not clear, but it has been reported to be essential for virus growth.
- NS2 is a metal protease and is required for its own cleavage, but its other functions are unknown.
- NS3 to NS5B are considered to form a complex, and together with the host protein, form an RNA replication apparatus to replicate genomic RNA.
- Interferon is widely used for the treatment of chronic hepatitis C.
- the rate at which HCV is exterminated from the body and completely cured has been gradually increased by improving the dosage form of interferon and improving administration methods such as combination therapy of interferon and ribavirin.
- the complete cure rate by interferon administration is still about 50%, and there are many cases that cannot be applied to serious side effects due to interferon administration or the elderly, and the development of effective treatments and drugs for HCV is desired. .
- HCV is infected through blood or blood components in humans, but in non-human organisms, it can infect apes (chimpanzees), and hepatitis may occur due to infection, leading to chronic hepatitis.
- small experimental animals that are easy to breed are not known to infect HCV at a high rate.
- Non-patent Document 1 a virus that inoculates serum collected from surgeons who developed acute hepatitis into small primate tamarins induced hepatitis.
- GBV-A and GBV-B Two types of viruses, GBV-A and GBV-B, were identified by analyzing the blood of transfusion hepatitis monkeys of unknown cause by molecular biological techniques (Non-patent Document 1). Of these, GBV-B is most closely related to HCV in molecular structure, and it was found that it infects tamarins and marmosets of New World monkeys and induces hepatitis (Non-patent Document 2).
- HCV has a narrow infection host range and there is no appropriate animal model
- the animal model of GBV-B and tamarin can be used as an alternative model of HCV infection growth.
- amino acid homology with HCV is as low as about 28%, and as a system for developing and evaluating drugs that specifically act on HCV, GBV- Even if an animal model of B and tamarin is used as it is, a drug that specifically acts on HCV cannot be screened.
- HVR1 of HCV was inserted into hypervariable region 1 (HVR1) of coat protein E2 of GBV-B, and confirmed infection with marmoset (Non-patent Document 4).
- HVR1 of HCV hypervariable region 1
- HVR1 of coat protein E2 of GBV-B hypervariable region 1
- Mart Document 4 infection with marmoset
- HCV has been difficult to develop drugs efficiently because there is no animal model that infects and proliferates other than chimpanzees. Chimpanzees are prohibited from being used in animal experiments due to the application of animal protection laws. For these reasons, the currently widely used interferon treatment has been developed and improved directly on patients as subjects, which has imposed a great burden on patients. Therefore, it is important to develop and evaluate pharmaceuticals using small animal models in preclinical studies.
- GBV-B that infects small primate tamarins is expected to be an animal model of HCV because it has a gene structure similar to HCV and induces hepatitis symptoms.
- the object of the present invention is to construct an HCV animal model that can be used in the development and evaluation system of HCV therapeutic agents, and maintain HCV replication function and can infect tamarin or marmoset. It is to provide a chimeric virus.
- HCV / GBV-B chimeric viruses that can be used for the development of drugs that specifically and effectively act on HCV, and the first in the amino acid sequence of the polyprotein of hepatitis C virus.
- HCV RNA containing RNA encoding NS4B protein containing 1804 leucine and 1966 lysine and GBV-B RNA are linked to maintain the replication function as HCV, and tamarin and marmoset HCV / GBV-B chimeric RNA that can be persistently infected and proliferated was prepared.
- the replication efficiency of this HCV / GBV-B chimeric RNA in the human liver cancer-derived cell line was higher than that of the parental HCV.
- the present inventor found that the obtained HCV / GBV-B chimeric RNA sufficiently maintained the replication function of HCV. Furthermore, when this HCV / GBV-B chimeric RNA was introduced into marmoset primary hepatocytes, the HCV / GBV-B chimeric RNA proliferated autonomously within the cell and released the core protein continuously into the cell supernatant. did. That is, the present inventor has found that a HCV / GBV-B chimeric virus capable of reinfection can be produced by transfecting HCV / GBV-B chimeric RNA into marmoset primary hepatocytes. The present invention is based on these findings.
- the present invention relates to a HCV / GBV-B chimeric RNA comprising hepatitis C virus RNA and GB virus-B RNA, wherein the hepatitis C virus RNA is an amino acid sequence of a polyprotein of hepatitis C virus.
- the present invention relates to an HCV / GBV-B chimeric RNA comprising an RNA encoding NS4B protein comprising leucine No. 1804 and lysine No. 1966.
- HCV / GBV-B chimeric RNA of the present invention (A) HCV-5 ′ RNA containing 5 ′ untranslated region RNA of hepatitis C virus, (B) GBV-B-RNA containing RNA encoding E1 protein and E2 protein of GB virus-B, and (C) NS3 protein, NS4A protein, NS4B protein, NS5A protein and NS5B protein of hepatitis C virus HCV-3 ′ RNA including RNA encoding 3 ′ and RNA of 3 ′ untranslated region, GBV-B-RNA (B) is inserted between the HCV-5 ′ RNA (A) and the HCV-3 ′ RNA (C).
- the HCV-5 ′ RNA comprises 5 ′ untranslated region RNA and RNA encoding part or all of the core protein.
- the GBV-B-RNA includes RNA encoding a part of the core protein, the E1 protein, the E2 protein, and the p6 protein;
- the HCV-3 ′ RNA includes p7 protein, NS2 protein, NS3 protein, NS4A protein, NS4B protein, NS5A protein and NS5B protein RNA, and 3 ′ untranslated region RNA. Is an RNA consisting of the base sequence represented by SEQ ID NO: 55.
- the present invention also relates to a HCV / GBV-B negative strand chimeric RNA complementary to the HCV / GBV-B chimeric RNA.
- the present invention also relates to an HCV / GBV-B chimeric virus comprising the HCV / GBV-B chimeric RNA.
- the present invention also relates to HCV / GBV-B chimeric DNA encoding the HCV / GBV-B chimeric RNA.
- the present invention also relates to an HCV / GBV-B chimeric protein translated from the RNA or the DNA of claim 7.
- the present invention also relates to an HCV / GBV-B chimeric RNA replicating cell comprising the HCV / GBV-B chimeric RNA.
- the present invention also relates to a non-human animal inoculated with the HCV / GBV-B chimeric RNA or the HCV / GBV-B chimeric virus according to claim 6.
- the HCV / GBV-B chimeric gene means HCV / GBV-B chimeric RNA and HCV / GBV-B chimeric DNA.
- HCV / GBV-B chimeric RNA of the present invention it is possible to provide a replicon RNA that can be replicated with high efficiency in vitro in cells derived from human liver.
- HCV / GBV-B chimeric virus particles that replicate autonomously in marmoset primary hepatocytes and are capable of persistent infection and reinfection can be produced.
- an HCV animal model using tamarin and marmoset which are small primates, can be constructed.
- the present invention also provides a cell in which this HCV / GBV-B chimeric gene replicates. Using this HCV / GBV-B chimeric replication system for cells in which the HCV / GBV-B chimeric gene is replicated, it is possible to screen for drugs that inhibit HCV proliferation. Animal models are also effective as a method for evaluating the effects of screened drugs. In this case, it is important to evaluate the drug by this method, and if it is essential for the management of the drug, it can be used as a method for manufacturing the drug.
- FIG. 3 is a graph showing the concentration of HCV core protein in the supernatant after transfection of Huh-7 cells with the HCV / GBV-B chimeric RNA of the present invention after 4 hours, 24 hours, 48 hours, and 72 hours.
- FIG. 3 is a graph showing the concentration of HCV core protein in the supernatant after transfection of tamarin primary hepatocytes with the HCV / GBV-B chimeric RNA of the present invention.
- FIG. 3 is a graph showing the number of HCV genomes in a supernatant obtained by infecting primary hepatocytes of tamarin with the in vitro synthesized HCV / GBV-B chimeric virus of the present invention.
- the HCV / GBV-B chimeric RNA of the present invention is a ligation of hepatitis C virus RNA and GB virus-B RNA. It contains RNA encoding NS4B protein containing 1966 lysine.
- the HCV / GBV-B chimeric RNA of the present invention encodes a viral particle that can grow in the liver cells of primate mammals such as tamarin and marmoset.
- the amino acid numbers of the 1804th leucine and the 1966th lysine indicate the amino acid numbers in the full-length polyprotein of hepatitis C virus consisting of 3010 amino acids.
- the 1804th leucine and the 1966th lysine are amino acids contained in the NS4B protein.
- RNA of hepatitis C virus containing a base sequence encoding these amino acids Patent Document 1
- NS4B protein containing these amino acids HCV polyproteins containing these amino acids and RNA replicons containing polynucleotides encoding these amino acids have not been reported.
- the HCV polyprotein is, for example, the core protein consisting of the first to 191st amino acid sequences and the 192nd to 383rd amino acids in the genotype 1b hepatitis C virus consisting of 3010 amino acids.
- E1 protein comprising the sequence
- E2 protein comprising the 384th to 746th amino acid sequence
- p7 protein comprising the 747th to 809th amino acid sequence
- NS2 protein comprising the 810th to 1026th amino acid sequence
- NS3 protein consisting of the 1027th to 1657th amino acid sequence
- NS4A protein consisting of the 1658th to 1711th amino acid sequence
- NS4B protein consisting of the 1712th to 1972th amino acid sequence, 1973th to 24th NS5A protein of nine amino acid sequence, or consists of NS5B protein consisting of the 2420 th to 3010 th amino acid sequence.
- the HCV polyprotein means a continuous protein translated from HCV RNA. For example, in HCV
- the HCV / GBV-B chimeric RNA of the present invention contains a polynucleotide encoding leucine No. 1804 and lysine No. 1966 in the full-length polyprotein of hepatitis C virus consisting of 3010 amino acids.
- HCV / GBV-B chimeric virus particles that can replicate in liver-derived cells and replicate autonomously in marmoset primary hepatocytes and can be reinfected.
- the HCV / GBV-B chimeric RNA can further include RNA that does not substantially inhibit the replication and infection of the chimeric RNA.
- RNA that does not substantially inhibit the replication and infection of the chimeric RNA For example, a selectable marker gene, reporter gene, or IRES sequence can be included.
- the HCV / GBV-B chimeric RNA of the present invention is not limited as long as it includes the polynucleotides encoding the 1804th leucine and the 1966th lysine, but preferably the HCV 5 ′ RNA, GBV A chimeric RNA comprising a base sequence represented by SEQ ID NO: 55, including three parts of -B-RNA and HCV 3'-side RNA.
- HCV 5 ′ RNA The RNA on the 5 ′ side of HCV includes at least the RNA of the 5 ′ untranslated region of HCV. Furthermore, RNA encoding part or all of the core protein of HCV can be included.
- the general HCV gene of genotype 1b is 5 ′ untranslated region RNA (No. 1 to No. 341: hereinafter sometimes referred to as 5 ′ UTR), followed by RNA encoding the core protein which is the virus structural protein (No. 342 to No. 914), RNA encoding the E1 protein (No. 915 to No. 1490), and RNA encoding the E2 protein (No. 1491 to 2579), RNA encoding p7 protein which is a nonstructural protein (2580 to 2768), RNA encoding NS2 protein (2769 to 3419), NS3 protein RNA (No. 3420 to 5312), RNA encoding NS4A protein (No. 5313 to No.
- RNA encoding NS4B protein No. 5475 to No. 6257
- RNA encoding NS5A protein No. 6258 to No. 7598
- RNA encoding NS5B protein No. 7599 to No. 9371
- 3′UTR RNA of the 3 ′ untranslated region
- the 5 ′ UTR usually consists of 341 nucleotides in the genotype 1b hepatitis C virus gene, and the 5 ′ RNA of HCV preferably contains the full-length nucleotide sequence.
- the RNA encoding the core protein consists of 573 nucleotides from No. 342 to No. 914, and the RNA on the 5 ′ side of HCV can contain all or part of the nucleotides.
- the base sequence of the 5 ′ RNA of HCV is not particularly limited, but is preferably 90% or more, more preferably 93% or more, most preferably relative to the base sequence of the region corresponding to SEQ ID NO: 55. It has a homology of 95% or more.
- the HCV / GBV-B chimeric RNA can be screened for an agent that inhibits the function of the 5 ′ UTR RNA or the RNA encoding the core protein by including the 5 ′ RNA of HCV.
- GBV-B-RNA preferably contains at least RNA encoding E1 protein and RNA encoding E2 protein. Furthermore, a part or all of the RNA encoding the core protein and / or a part or all of the RNA encoding the p6 protein can be included.
- the gene of GBV-B encodes RNA in the 5 ′ untranslated region (No. 1 to No. 445: hereinafter sometimes referred to as 5 ′ UTR), followed by a core protein that is a structural protein of the virus.
- RNA No. 446 to No. 913
- RNA encoding E1 protein No. 914 to No. 1489
- RNA encoding E2 protein No. 1490 to No.
- RNA encoding a certain p6 protein No. 2285 to No. 2452
- RNA encoding a p7 protein No. 2453 to No. 2641
- RNA encoding an NS2 protein No. 2642 to No. 3265
- NS3 RNA encoding protein No. 3266 to No. 5125
- RNA encoding NS4A protein No. 512
- RNA encoding NS4B protein No. 5291 to No. 6034
- RNA encoding NS5A protein No. 6035 to No. 7267
- RNA encoding NS5B protein No.
- 3′UTR RNA of the 3 ′ untranslated region (from 9038 onward: hereinafter sometimes referred to as 3′UTR).
- the structural difference from the HCV gene is that GBV-B has a region encoding the p6 protein.
- the RNA encoding the E1 protein of GBV-B is preferably composed of 576 nucleotides from No. 914 to No. 1489 and includes the full length nucleotide sequence.
- the RNA encoding the E2 protein consists of 795 nucleotides from 1490th to 2284th, and preferably includes the full length nucleotide.
- the RNA encoding the core protein consists of 468th nucleotides from No. 446 to No. 913, and GBV-B-RNA can contain all or part of the nucleotides. Furthermore, the p6 protein consists of 168 nucleotides from number 2285 to number 2452, and GBV-B-RNA can contain all or part of the nucleotides.
- the base sequence of GBV-B-RNA is not particularly limited as long as it functions as a protein of translated GBV-B, that is, the produced chimeric virus has the ability to infect experimental animals such as tamarin and marmoset.
- RNA on the 3 ′ side of HCV is at least RNA encoding NS3 protein, RNA encoding NS4A protein, RNA encoding NS4B protein, RNA encoding NS5A protein, RNA encoding NS5B protein, and 3 ′ non-RNA Contains RNA of the translation region.
- RNA encoding HCV p7 protein and RNA encoding NS2 protein can be included.
- the RNA encoding the p7 protein consists of 189 nucleotides from 2580th to 2768th, and may contain all or part of the nucleotides.
- the RNA encoding NS2 protein is composed of 651 nucleotides from 2769 to 3419, and can contain the full length nucleotide.
- the RNA encoding the NS3 protein consists of 1893 nucleotides from 3420th to 5312th, and preferably contains the full length nucleotide.
- the RNA encoding NS4A protein consists of 162 nucleotides from 5313 to 5474, and preferably contains the full length nucleotide.
- the RNA encoding NS4B protein consists of 783 nucleotides from 5475th to 6257th, and preferably includes the full length nucleotide.
- the RNA encoding the NS5A protein is composed of 1341 nucleotides ranging from Nos. 6258 to 7598, and preferably comprises the full length nucleotides.
- the RNA encoding the NS5B protein consists of 1773 nucleotides from the 7599th to the 9371th, and preferably contains the full length nucleotide.
- the 3 ′ UTR RNA is RNA after 9372, and the length varies depending on the virus strain. Usually, the variable region is 41 nucleotides, the poly U region is different in length depending on the strain, and the 3′X of 98 nucleotides. Consists of regions.
- the HCV 3 ′ RNA preferably contains the full length 3 ′ UTR.
- HCV / GBV-B chimeric RNA is RNA encoding the core of HCV, RNA encoding the core of GBV-B, or RNA encoding the core of the chimera of HCV and GBV-B as RNA encoding the core. Can be included. These core proteins translated from HCV / GBV-B chimeric RNA can be included in HCV / GBV-B chimeric virus particles.
- HCV / GBV-B chimeric RNA is all or part of RNA encoding GBV-B p6 protein, all or part of RNA encoding p7 protein of HCV, and / or all of RNA encoding NS2 protein. Or a part can be included.
- the 3′-side RNA of HCV includes RNA encoding leucine at 1804 and lysine at 1966 in the amino acid sequence of the hepatitis C virus polyprotein. This amino acid is contained in the NS4B protein, and includes RNA encoding the two amino acid sequences, and more preferably includes RNA encoding the NS4B protein including the two amino acid sequences.
- HCV / GBV-B chimeric RNA is considered to be able to replicate RNA and produce chimeric virus even in primary marmoset hepatocytes.
- the base sequence of the 3′-side RNA of HCV is not particularly limited, but is preferably 80% or more, more preferably 90% or more, and most preferably relative to the base sequence of the region corresponding to SEQ ID NO: 55. It has a homology of 95% or more.
- the HCV / GBV-B chimeric RNA can be screened or evaluated for an agent that inhibits the function of the nonstructural protein by containing the HCV 3 ′ RNA, and an agent that inhibits the function of the 3′UTR RNA. it can.
- the HCV / GBV-B chimeric RNA of the present invention is obtained by binding the HCV 5′-side RNA (A), GBV-B-RNA (B), and the HCV 3′-side RNA (C) in that order. preferable. That is, it is preferable that GBV-B-RNA (B) is inserted between 5'-side RNA (A) and HCV 3'-side RNA (C).
- the genotype of HCV-RNA is not particularly limited, but HCV genotype 1b is preferred.
- HCV genes can be classified into at least six types of genotypes according to their base sequences, and genotype 1b is a subtype belonging to genotype 1.
- the HCV of genotype 1b is classified based on the base sequence of the RNA. For example, HCV having a polynucleotide comprising a base sequence showing 90% or more homology to the base sequence of SEQ ID NO: 57 is included. .
- the HCV / GBV-B chimeric RNA of the present invention can be replicated intracellularly, for example, human hepatocytes, tamarin hepatocytes, and marmoset hepatocytes. That is, it can function as a replicon RNA.
- the HCV / GBV-B chimeric RNA of the present invention functions as a plus-strand RNA that serves as a protein template, ie, mRNA.
- Minus strand RNA is synthesized from the plus strand RNA, and plus strand RNA can be synthesized using the minus strand RNA as a template.
- the HCV / GBV-B minus-strand chimeric RNA of the present invention is also useful in that it serves as a template for the HCV / GBV-B chimeric RNA that is a plus strand.
- the HCV / GBV-B chimeric virus of the present invention contains the HCV / GBV-B chimeric RNA, and can contain several proteins constituting the virus translated from the HCV / GBV-B chimera.
- the protein constituting the virus is not limited, but, for example, a core protein of HCV, a chimeric core protein comprising a part of the core protein of HCV and a part of the core protein of GBV-B, E1 of GBV-B Mention may be made of proteins and E2 proteins.
- the HCV / GBV-B chimeric DNA of the present invention is not limited as long as it is a DNA corresponding to the HCV / GBV-B chimeric RNA.
- the HCV / GBV-B chimeric RNA can be obtained by reverse transcriptase from the HCV / GBV-B chimeric RNA. Examples thereof include a synthesized single-stranded cDNA, a double-stranded DNA composed of the single-stranded cDNA and its complementary strand, or a double-stranded DNA incorporated into a plasmid.
- the vector of the present invention is a vector containing the HCV / GBV-B chimeric DNA.
- plasmid vectors linear double-stranded DNA vectors, and viral vectors such as adenovirus vectors, adeno-associated virus vectors, retrovirus vectors, and lentivirus vectors can be exemplified.
- a plasmid vector is preferred.
- the HCV / GBV-B chimeric protein of the present invention is a protein translated from the HCV / GBV-B chimeric RNA.
- the HCV / GBV-B chimeric RNA of the present invention can be prepared using any genetic engineering technique. Although it does not limit, chimera RNA can be produced with the following methods, for example.
- DNA encoding the HCV / GBV-B chimeric RNA is inserted into a cloning vector by a conventional method to prepare a DNA clone.
- the obtained DNA is inserted downstream of the RNA promoter to produce a DNA clone capable of producing replicon RNA. More specifically, for example, a gene lacking the core protein 156 to E2 protein of TPF1 clone (Patent Document 1) isolated from a patient with fulminant hepatitis C is constructed, and the core protein of GBV-B is constructed.
- Patent Document 1 a gene lacking the core protein 156 to E2 protein of TPF1 clone isolated from a patient with fulminant hepatitis C is constructed, and the core protein of GBV-B is constructed.
- a gene from the 124th protein to the p6 protein can be chemically synthesized and inserted and linked to the deleted portion of HCV to construct an HCV / GBV-B chimeric gene.
- the RNA promoter is preferably contained in a plasmid clone. Examples of the RNA promoter include, but are not limited to, a T7 RNA promoter, an SP6 RNA promoter, and an SP3 RNA promoter, and a T7 RNA promoter is particularly preferable.
- the HCV / GBV-B chimeric RNA is (A) HCV-5 ′ RNA comprising 5 ′ untranslated region RNA of hepatitis C virus and RNA encoding a part of core protein and E1 protein, (B) GBV-B-RNA containing a part of E1 protein of GB virus-B and RNA encoding E2 protein, and (C) NS3 protein, NS4A protein, NS4B protein, NS5A protein of hepatitis C virus And RNA encoding NS5B protein, and RNA of 3 ′ untranslated region, preferably RNA encoding p7 protein, NS2 protein, NS3 protein, NS4A protein, NS4B protein, NS5A protein and NS5B protein, and 3 ′ HCV-3 ′ RNA containing untranslated region RNA, including.
- GBV-B-RNA (B) is inserted between the HCV-5′-side RNA (A) and the HCV-3′-side RNA (C), and is encoded by the HCV-5′-side RNA (A).
- a part of the E1 protein is a part on the N-terminal side of the E1 protein
- a part of the E1 protein encoded by the GBV-B-RNA (B) is a part on the C-terminal side of the E1 protein.
- the fusion of both parts covers the full length of the E1 protein.
- the RNA of the 5 ′ untranslated region and the core protein in the HCV-5 ′ RNA (A) are as described above, and preferably the region corresponding to the base sequence shown in SEQ ID NO: 57 (ie, The RNA of the 5 ′ untranslated region is the nucleotide sequence Nos. 1 to 341 of the nucleotide sequence shown in SEQ ID NO: 57, and the core protein coding region is the nucleotide sequence of the nucleotide sequence Nos. 342 to 914 of the nucleotide sequence shown in SEQ ID NO: 57).
- nucleotide sequence having a homology of 90% or more, more preferably 93% or more, more preferably 95% or more, more preferably 99% or more with the nucleotide sequence can be propagated in primate liver cells. Those capable of constructing simple virus particles are preferred.
- the “homology” of the nucleotide sequences is a percentage obtained by aligning both sequences so that the bases in the two nucleotide sequences to be compared match as much as possible, and dividing the number of matching bases by the total number of bases. It is a representation. In the above alignment, a gap is appropriately inserted in one or both of the two sequences to be compared as necessary.
- sequence alignment can be performed using a known program such as BLAST, FASTA, CLUSTAL W, and the like.
- the total number of bases is a number obtained by counting one gap as one base.
- the homology (%) is calculated by dividing the total number of bases by the total number of bases of the longer sequence.
- the HCV-5 'RNA (A) also includes a region encoding a part of the N-terminal side of the E1 protein.
- the E1 protein of HCV is No. 915 to No. 1490 of the base sequence shown in SEQ ID NO: 57. Therefore, a partial region on the 5 ′ side of this sequence or 90% or more thereof, more preferably 93 % Or more, more preferably 95% or more, more preferably 99% or more of a base sequence capable of constructing virus particles capable of growing in primate liver cells such as tamarin and marmoset. preferable.
- the region encoding part of the N-terminal side of the E1 protein is preferably a region of 30 amino acids or less from the N-terminus of the E1 protein, from the viewpoint of proliferation in primate liver cells.
- HCV-5 ′ RNA (A) was used to construct a v11-E12 chimeric RNA encoding 11 amino acids and a v27-E12 chimeric RNA encoding 27 amino acids from the N-terminus of the E1 protein.
- GB virus-B RNA (GBV-B-RNA) (B) encodes a portion of the E1 protein on the C-terminal side and the E2 protein.
- the “part on the C-terminal side” means the C-terminal side of the partial region of the E1 protein encoded by the HCV-5′-side RNA (A).
- the majority is encoded by GBV-B-RNA (B).
- SEQ ID NO: 99 shows the full-length base sequence of GBV-B-RNA
- SEQ ID NO: 100 shows the amino acid sequence encoded thereby.
- the E1 protein coding region is numbered 914 to 1489
- the E2 protein coding region is numbered 1490 to 2284.
- GBV-B-RNA (B) preferably further encodes a p6 protein.
- the p6 protein coding region is from No. 2285 to No. 2452.
- GBV-B-RNA (B) has the nucleotide sequence of the corresponding region shown in SEQ ID NO: 99 or 90% or more, more preferably 93% or more, more preferably 95% or more, more preferably 99% or more.
- a nucleotide sequence having homology and capable of constructing a virus particle capable of growing in a primate liver cell is preferred.
- the E1 protein is encoded by both HCV-5 ′ RNA (A) and GBV-B-RNA (B), but the fusion of both parts covers the full length of the E1 protein.
- the areas encoded by both may partially overlap.
- the size of the overlapping region is preferably about 1 to 24 amino acids.
- 11 amino acids from the N terminus of the E1 protein are encoded by HCV-5 ′ RNA (A), while E1 protein is encoded by GBV-B-RNA (B). Is encoded from the 3rd amino acid from the N-terminal, so that 8 amino acids overlap.
- the subsequent HCV-3 ′ RNA (C) is the same as described above, and includes an RNA encoding NS3 protein, NS4A protein, NS4B protein, NS5A protein and NS5B protein, and RNA of 3 ′ untranslated region, , RNA encoding the p7 protein, NS2 protein, NS3 protein, NS4A protein, NS4B protein, NS5A protein and NS5B protein, and RNA of the 3 ′ untranslated region.
- the p7 protein has the p7 protein coding region from 2580 to 2768, the NS2 protein coding region from 2769 to 3419, and the NS3 protein coding. The region is Nos.
- the NS4A protein coding region is Nos. 5313 to 5474
- the NS4B protein coding region is Nos. 5475 to 6257
- the NS5A protein coding region is No. 6258.
- No. 7598 and the NS5B protein coding region is No. 7599 to No. 9371
- the RNA of the 3 ′ untranslated region is No. 9372 or later.
- the HCV-3 ′ RNA (C) is 90% or more, more preferably 93% or more, more preferably 95% or more, more preferably the nucleotide sequence of these regions in the nucleotide sequence shown in SEQ ID NO: 57.
- a nucleotide sequence having a homology of 99% or more and capable of constructing virus particles capable of growing in primate liver cells is preferable.
- the regions (A), (B), and (C) are linked together in the reading frame, and the protein encoded thereby can be propagated in the liver cells of primates such as tamarin and marmoset. It codes for viral particles.
- the E1 fusion type include v11-E12 chimeric RNA (SEQ ID NO: 93) and v27-E12 chimeric RNA (SEQ ID NO: 95) constructed in the following Examples, and preferably 90% or more, more preferably 95 %, More preferably 99% or more of homology, and those that encode viral particles that can grow in primate liver cells.
- core GB type RNA containing 5 ′ untranslated region RNA of hepatitis C virus
- B GBV-B-RNA containing RNA encoding E1 protein and E2 protein of GB virus-B
- C NS3 protein, NS4A protein, NS4B protein, NS5A protein and NS5B protein of hepatitis C virus
- RNA encoding 3 'untranslated region preferably RNA encoding p7 protein, NS2 protein, NS3 protein, NS4A protein, NS4B protein, NS5A protein and NS5B protein, and 3' untranslated region HCV-3 ′ RNA containing the RNA of including.
- the RNA of the 5 ′ untranslated region in the HCV-5 ′ side RNA is the same as the RNA of the 5 ′ untranslated region of the E1 fusion type, and the preferred one is also the E1 fusion type. It is the same as the case of.
- the subsequent core protein is encoded by GBV-B-RNA (B).
- the core protein coding region in GBV-B-RNA is Nos. 446 to 913 in the nucleotide sequence shown in SEQ ID NO: 99, and the core GB type core protein coding region is the region of SEQ ID NO: 99.
- the full length of the subsequent E1 protein coding region is also encoded by GBV-B-RNA (B).
- the E1 protein coding region is Nos. 914 to 1489, and the E2 protein coding region is Nos. 1490 to 2284.
- GBV-B-RNA (B) preferably further encodes a p6 protein.
- the p6 protein coding region is from No. 2285 to No. 2452.
- GBV-B-RNA (B) has the nucleotide sequence of the corresponding region shown in SEQ ID NO: 99 or 90% or more, more preferably 93% or more, more preferably 95% or more, more preferably 99% or more.
- a nucleotide sequence having homology and capable of constructing a virus particle capable of growing in a primate liver cell is preferred.
- the structure downstream of the E1 protein coding region (including the HCV-3 ′ RNA (C)) is the same as that of the above-mentioned E1 fusion type, and the description of these regions for the above-mentioned E1 fusion type is applied as it is. .
- the regions (A), (B), and (C) are linked together in the reading frame, and the protein encoded thereby can be propagated in the liver cells of primates such as tamarin and marmoset. It codes for viral particles.
- the core GB type include C6 chimeric RNA (SEQ ID NO: 97) constructed in the following example and preferably 90% or more, more preferably 95% or more, and more preferably 99% or more homology with this. And those that encode viral particles that can be propagated in primate liver cells.
- the E1 fusion type and the core GB type can also be produced using any genetic engineering technique as described above. Although it does not limit, chimera RNA can be produced with the following methods, for example.
- the DNA encoding the HCV / GBV-B chimeric RNA is inserted into a cloning vector by a conventional method to prepare a DNA clone.
- the obtained DNA is inserted downstream of the RNA promoter to produce a DNA clone capable of producing replicon RNA.
- a TPF1 clone isolated from a patient with fulminant hepatitis C was mutated so that the amino acid sequence encoded by it was leucine at position 1804 and lysine at position 1966 ( DNA lacking the region encoded by GBV-B-RNA (B) in Patent Document 1, SEQ ID NO: 57) is constructed, while the DNA of GBV-B-RNA (B) is chemically synthesized
- the HCV / GBV-B chimeric DNA can be constructed by inserting and ligating to the deleted portion of HCV.
- the RNA promoter is preferably contained in a plasmid clone.
- RNA promoter examples include, but are not limited to, T7 RNA promoter, SP6 RNA promoter, SP3 RNA promoter, and T7 RNA promoter is particularly preferable.
- T7 RNA promoter examples include, but are not limited to, T7 RNA promoter, SP6 RNA promoter, SP3 RNA promoter, and T7 RNA promoter is particularly preferable.
- the specific construction methods of preferred examples of the E1 fusion type and the core GB type are described in detail in the following examples.
- HCV / GBV-B chimeric RNA of the present invention can be prepared from a vector into which the above DNA has been inserted.
- RNA is synthesized by RNA polymerase using the DNA clone as a template.
- RNA synthesis can be initiated from the 5 'untranslated region by conventional methods.
- the template DNA is a plasmid clone
- the DNA region linked downstream of the RNA promoter is cut out from the plasmid clone with a restriction enzyme, and RNA can be synthesized using the DNA fragment as a template.
- HCV genomic RNA can be synthesized by T7 RNA polymerase.
- the replicating cell of the present invention can be prepared by introducing the HCV / GBV-B chimeric RNA described above into any cell.
- the cell into which the HCV / GBV-B chimeric RNA is introduced is not particularly limited, but monkey liver-derived cells or human liver-derived cells are preferred.
- monkey liver-derived cells include marmoset primary hepatocytes or tamarin primary hepatocytes.
- human liver cancer-derived cells include Huh7 cells, HepG2 cells, or Hep3B cells, or IMY-N9 cells.
- Other cancer cells include HeLa cells, CHO cells, COS cells, and Vero cells. Or 293 cells.
- HCV / GBV-B chimeric RNA can be introduced into cells by any transfection method.
- introduction methods include electroporation, particle gun method, and lipofection method.
- electroporation is particularly preferred when introduced into Huh7 cells of a human liver cancer-derived cell line.
- the lipofection method is preferred.
- Controlling infection with hepatitis C virus means, for example, control of HCV RNA replication (for example, promotion or suppression) and control of RNA-to-protein translation (for example, promotion or suppression).
- the test substance can be screened by contacting the replicating cells with the test substance and analyzing the degree of increase in the HCV / GBV-B chimeric RNA.
- the degree of increase in HCV / GBV-B chimeric RNA means a change in the speed or amount of replication of the replicon RNA.
- test substance by detecting or measuring the amount of HCV / GBV-B chimeric RNA in replicating cells and comparing it with the amount of HCV / GBV-B chimeric RNA in replicating cells that are not in contact with the control test substance, A test substance can be screened. In addition, the amount of hepatitis C virus protein, GBV-B protein, or HCV / GBV-B chimeric protein in the cell or supernatant is detected or measured, and that of a replicated cell that does not come into contact with the control test substance It is possible to screen a test substance also by comparing.
- the hepatitis C virus protein that can be detected or measured in the screening is not particularly limited, but is preferably a core protein, and the core protein can also be measured using a commercially available kit. It is also possible to adapt to a high-throughput screening method by automating the screening method.
- the replicating cell of the present invention can produce HCV / GBV-B chimeric RNA, HCV / GBV-B chimeric protein, and HCV / GBV-B chimeric virus. Further, the replication of the HCV / GBV-B chimeric RNA in the replicating cell of the present invention may be either transient replication or continuous replication. Furthermore, when an HCV / GBV-B chimeric virus is produced by replicating cells, the produced virus can reinfect the cells.
- a model animal for HCV infection can be prepared.
- the non-human experimental animal is not particularly limited as long as the HCV / GBV-B chimeric virus replicates or infects, but is preferably a small primate, more preferably a marmoset or tamarin.
- the method for administering HCV / GBV-B chimeric RNA to an experimental animal is not particularly limited, but is intraperitoneal, intramuscular, intrathecal, intracranial, intravenous, respiratory, oral, or liver Intrahepatic administration can be mentioned, and direct administration into the liver is preferred. Further, the method of administering the HCV / GBV-B chimeric virus to the experimental animal is not particularly limited, but intraperitoneal, intramuscular, intrathecal, intracranial, intravenous, intrarespiratory, oral administration, or Intrahepatic administration can be mentioned, and intravenous administration is preferred.
- test substance can be screened or evaluated by administering a test substance to an experimental animal and analyzing the degree of increase in HCV / GBV-B chimeric virus, the onset of hepatitis, and the like.
- the HCV RNA used for the HCV / GBV-B chimeric RNA of the present invention includes an RNA encoding NS4B protein containing the 1804th leucine and the 1966th lysine in the amino acid sequence of the hepatitis C virus polyprotein.
- the 1804th amino acid is glutamine and the 1966th amino acid is glutamic acid.
- RNA replication efficiency is improved. Astonishingly rising. Therefore, the chimeric virus containing the RNA is considered to have high replication and proliferation efficiency in tamarin cells or in vivo, or marmoset cells or in vivo.
- the HCV RNA is considered to be able to replicate in tamarin and marmoset cells even when it is not a chimeric virus.
- the replication efficiency or infection efficiency is increased.
- HCV genotype 1b RNA containing 1804th leucine and 1966 lysine is considered to increase the replication efficiency. Therefore, the HCV RNA used for the chimeric RNA is preferably genotype 1b.
- the HCV / GBV-B chimeric RNA or HCV / GBV-B chimeric virus of the present invention has a replication function in Huh-7 cells and is considered to maintain the replication function as HCV. . Therefore, the non-human animal of the present invention is useful for developing preventive and therapeutic agents for HCV.
- (D) Determination of base sequence The base sequence of HCV cDNA was determined using primers designed based on the base sequence of HCV genotype 1b. Using the CEQ DTCS Quick Start Kit (Beckman Coulter), the reaction was carried out according to the method recommended by the manufacturer, and analyzed by CEQ2000 XL DNA analysis system (Software version 4.0.0, Beckman Coulter). The obtained data was analyzed by Sequencher (Version 4.1.2, Gene Codes Corporation). The obtained HCV clone was named pTPF1-0193.
- the first PCR was performed using Takara LA Taq DNA polymerase (Takara Shuzo) with 5'RACE Abridged Anchor primer and KY78 primer attached to the kit. A portion of this PCR product was used as a template, and PCR was performed a second time using Takara LA Taq DNA polymerase (Takara Shuzo) with the UTP primer and KM2 primer attached to the kit. This PCR product was cloned into the pGEM-T easy vector, and the nucleotide sequence was determined according to the step (D). An HCV cDNA clone containing positions 1 to 709 in the obtained sequence was named pTPF1-0007.
- the obtained HCV strain was named TPF1 strain.
- the TPF1 strain was a full length 9594 base HCV.
- the obtained polynucleotide of the TPF1 strain had a translation region encoding 3010 continuous amino acids between positions 342 to 9374.
- pTPF1 structural protein coding region and a part of the nonstructural protein coding region were divided into neomycin resistance gene (neomycin phosphotransferase, NPT-II) and EMCV-IRES (encephalomyocarditis virus internal ribosome).
- neomycin resistance gene neomycin phosphotransferase, NPT-II
- EMCV-IRES encephalomyocarditis virus internal ribosome
- pTPF1 was first cleaved with restriction enzymes AgeI and BsrGI, and the 5′UTR-to-Core region sequence derived from pTPF1 and the neomycin resistance gene derived from pcDNA3.1 (+) were obtained by PCR amplification at the cleavage site.
- the amplified fragment cleaved with restriction enzymes AgeI and PmeI, and the sequence from EMCV-IRES to NS3 region were combined by PCR amplification, and the fragment cleaved with restriction enzymes PmeI and BsrGI were ligated and inserted.
- RNA was synthesized using Megascript T7 kit (Ambion) using the plasmid ⁇ DNA pRepTPF1 cleaved with XbaI as a template. RNA was purified by the method recommended by the manufacturer.
- Human hepatoma cells (Huh7, JCRB0403) are 10% fetal bovine serum (FBS), penicillin and streptomycin at 50DU / mL and 50 ⁇ g / mL respectively in Dulbecco's modified Eagle medium (D-MEM, IWAKI) The added solution was cultured at 37 ° C with 5% carbon dioxide added. Cells before confluence are detached from the culture dish by trypsin and EDTA treatment, and trypsin is inactivated by resuspending in a serum-supplemented medium.
- FBS fetal bovine serum
- penicillin and streptomycin 50DU / mL and 50 ⁇ g / mL respectively in Dulbecco's modified Eagle medium (D-MEM, IWAKI)
- D-MEM Dulbecco's modified Eagle medium
- RNA After adding an appropriate amount of RNA to the cells, cool on ice for 5 minutes. Pulses are applied at 960 uF, 250 V with an electroporator (Bio-Rad). Immediately resuspend in 8 mL of medium and plate a portion. After culturing for a certain time, G418 (neomycin) was added to the culture plate at a concentration of 1 mg / mL. Thereafter, the culture was continued while changing the culture solution at intervals of 4 days. A colony of viable cells was cloned from the culture plate after about 20 days of culture from the time of seeding, and the culture was continued. By cloning such colonies, cells in which the pRepTPF1 replicon RNA replicates autonomously could be established. The presence or absence of replicon RNA replication was analyzed by quantitative RT-PCR for the copy number of the replication replicon RNA contained in cellular RNA.
- Reference Example 3 Analysis of adaptive mutation >> From the replicon RNA-replicating cell line established by transfecting RNA synthesized in vitro with pRepTPF1 as a template into Huh7 cells according to Reference Example 2, using ISOGEN (Nippon Gene), intracellular RNA was extracted.
- RNA covering almost the entire region of the replicon RNA was amplified in the same manner as the gene was obtained from TPF1 in Reference Example 1. Specifically, cDNA for replicon RNA was synthesized using the extracted intracellular RNA as a template with SuperSucript II reverse reversease (Invitrogen) and XR58R primer.
- the effect of the amino acid substitution on replication of replicon RNA was examined.
- the HCV RNA replicon pRepTPF1 prepared in Reference Example 2 was subjected to an adaptive mutation of amino acid number 1804 (Q to L) and amino acid number 1906 (E to K) using Quick Mutagenesis Kit (Stratagene) according to the manufacturer's recommended method. Introduced.
- the replicon RNA into which this amino acid substitution was introduced was named pRep4B.
- RNA was synthesized using Megascript-T7-kit (Ambion) using pRepTPF1 having no base sequence causing mutation and pRep4B having amino acid mutation as a template obtained by cleaving with plasmid DNA.
- RNA was purified by the method recommended by the manufacturer. Each purified RNA was transfected into Huh7 cells, cultured in the presence of G418 for about 20 days, and viable cells were stained with crystal violet. The number of stained colonies was counted, and the number of colonies per 1 ⁇ g of transfected replicon RNA amount was calculated.
- Reference Example 4 Effect of adaptive mutation on HCV RNA replication >> The full-length HCV DNA pTPF1 prepared in Reference Example 2 was cleaved with the restriction enzyme SfiI, and a fragment obtained by cleaving pRep4B with the restriction enzyme SfiI was ligated and inserted into the cleaved site. pTPF1 / 4B was prepared. This base sequence (indicated by RNA) is shown in SEQ ID NO: 57, and the amino acid sequence encoded by this is shown in SEQ ID NO: 58.
- Example 1 Construction of HCV / GBV-B chimeric gene (1) C156 chimeric gene (SEQ ID NO: 55)
- the above-mentioned pTPF1 / 4B containing the HCV gene that has been confirmed to grow in a human hepatoma cell line is obtained by using Age I primer 5′-GGAACCGGTGGATACACCCGGAATTGCCAGG-3 ′ (SEQ ID NO: 101) and 5′-ACCCGTACGCCATGCGCGCGGGCCCTGGCAG-3 ′ (Spl I primer).
- the amplified fragments were separated by 0.7% agarose gel electrophoresis, and the DNA fragments were collected by a method recommended by the manufacturer using a QIAquick gel purification kit (QIAGEN).
- the recovered TPF1 fragment was ligated with a pGEM-T easy vector (Promega) according to the method recommended by the manufacturer, and the DH5 ⁇ strain was transformed with the plasmid.
- Transformants that were resistant to ampicillin and formed white colonies by plating on an agar medium supplemented with IPTG and X-gal were selected and cultured in 2YT medium supplemented with ampicillin at 100 ⁇ g / mL. Plasmid was purified from the cultured cells using Wizard Plus SV Miniprep DNA Purification System.
- the sequence of the TPF1 fragment incorporated in the purified plasmid is reacted according to the method recommended by the manufacturer using CEQ DTCS Quick Start Kit (Beckman Coulter) using primers prepared as appropriate for the vector and HCV sequences. Analysis was performed using CEQ2000 XL DNA analysis system (Software version 4.0.0, Beckman Coulter). Based on the obtained data, sequence data were integrated and analyzed using Sequencer (Version 4.1.2, Gene Codes Corporation), and the base sequence of pTPF1-AgeSpl was confirmed.
- GBBC-s1 (SEQ ID NO: 1): 5′-CGTACCGCTTGCTGGAGGATGGAGTCAACTGGGCCTACTGGTTGGTTCGGTGTCCACCCTTT-3 ′
- GBBCE1-s2 (SEQ ID NO: 2): 5'-TGTGGTATGTCTGCCTATTTTGGCCTGTCCCCTTAGTAGGGGGCGCGGGTCACTGACCCAGA-3 '
- GBBE1-s3 SEQ ID NO: 3): 5'-CACAAATACCACAATCCCTGACCAATTGCTGCCCACGTAATCAGGTTATTCTATTGTTCTC-3 ' GBBE1-s4 (SEQ ID NO: 4): 5′-TTCCACTTGCCTACACGAGCTCTGGTTGGTGATCTGTGCGGACGAGTGCTGGGTTCCCGC-3 ′ GBBE1-s5 (SEQ ID NO: 1): 5′-CGTACCGCTTGCTGGAGGATGGAGTCAACTGGGCCTACTGGTTGGTTCGGTGTCCACCCT
- phosphorylation was performed using T4 Polynucleotide Kinase (Takara Shuzo). These phosphorylated products were mixed and gradually cooled from 95 ° C. to room temperature to anneal each synthetic gene, and a ligation reaction was performed using Takara Ligation Kit (Takara Shuzo). The ligated product was subjected to blunting of double-stranded DNA ends using Klenow Fragment (Takara Shuzo). This double-stranded DNA was cloned into the pGEM-T easy vector, the base sequence was determined, and the target GBV-B gene was confirmed.
- the gene mutation from T to C at the base number 9594 in pTPF1 / 4B was performed according to the manufacturer's recommended method using Quick Mutagenesis Kit (Stratagene). Mutation was introduced.
- the plasmid introduced with this mutation was named pTPF1 / 4B-Xho.
- the Age I-Spl I fragment cloned by PCR from pTPF1 / 4B and digested with restriction enzymes, the BbvC I-Rsr II fragment digested with restriction enzymes from pTPF1 / 4B, and GBV-B digested with restriction enzymes The Spl I-BbvC I fragment of the gene is ligated to a vector digested with Age I-Rsr II of pTPF1 / 4B-Xho, thereby HCV / GBV-B chimeric plasmid pTPF / GBB-C156E12 having GBV-B coat protein.
- v11 chimeric gene (SEQ ID NO: 93) pTPF1 / 4B using Takara EX Taq DNA polymerase (Takara Shuzo Co., Ltd.) in the presence of the aforementioned Age I primer and EcoR V (v11) primer 5′-GASATCGTACAGCCCGGATACGTTGCGCAC-3 ′ (SEQ ID NO: 103), 94 ° C., 20 seconds PCR was carried out by 20 thermal cycle reactions consisting of 68 ° C. and 30 seconds to amplify the 5′UTR of the TPF1 genome to the 11th E1 protein.
- the amplified product was subjected to a ligation reaction with the pGEM-Teasy vector using the same method as that for obtaining the HCV gene fragment (pTPF1-AgeSpl) in Example 1, and the sequence was determined according to a conventional method. As a result, the base sequence of pTPF1-AgeEcoR (v11) was confirmed.
- pTPF / GBB-C156E12 was transformed into SnaBI primer 5'-TACGTAACTGACCCAGACACAAATACCACA-3 '(SEQ ID NO: 104) and BbvCI primer 5'-CCTCAGCCCATGGCACAAACCTAAAAGGG-3'
- Takara EX Taq DNA polymerase (Takara Shuzo) was used to perform PCR by 20 thermal cycle reactions consisting of 94 ° C., 20 seconds, 68 ° C., and 90 seconds, whereby 3 GB of E1 protein of GBV-B genome was obtained.
- From the second to the p6 protein was amplified.
- the amplified product was ligated with the pGEM-T easy vector to determine the sequence.
- the base sequence of pGBV-B SnaBbv was confirmed.
- Age I-EcoR V (v11) fragment cloned by PCR from pTPF1 / 4B and digested with the restriction enzyme and the Sna BI-BbvC I fragment of the GBV-B gene digested with the restriction enzyme were pTPF1 / 4B-Xho.
- HCV / GBV-B chimeric plasmid pTPF / GBB-v11E12 having GBV-B coat protein was constructed by ligation to a vector digested with the above-mentioned Age I-BbvCI.
- v27 chimeric gene (SEQ ID NO: 95) Using the above-mentioned Age I primer and EcoR V (v27) primer 5′-GATATCCCTGCCTCCATACACAATGCTTGA-3 ′ (SEQ ID NO: 106) in Takara EX Taq DNA polymerase (Takara Shuzo) at 94 ° C., 20 ° C. By performing PCR by 20 thermal cycle reactions consisting of seconds, 68 ° C., and 90 seconds, the 5′UTR of the TPF1 genome to the 27th of the E1 protein were amplified.
- the amplified product was subjected to a ligation reaction with the pGEM-Teasy vector using the same method as that for obtaining the HCV gene fragment (pTPF1-AgeSpl) in Example 1, and the sequence was determined according to a conventional method. As a result, the base sequence of pTPF1-AgeEcoR (v27) was confirmed.
- Age I-EcoR V (v27) fragment cloned by PCR from pTPF1 / 4B and digested with the restriction enzyme and the fragment obtained by digesting the above-described pGBV-B SnaBbv with the restriction enzyme Sna BI-BbvC I are pTPF1 / 4B-
- An HCV / GBV-B chimeric plasmid pTPF / GBB-v27E12 having a GBV-B coat protein was constructed by ligation to a vector digested with Xho's Age I-BbvCI.
- C6 chimeric gene (SEQ ID NO: 97) Genes from the core protein of GBV-B having 5′UTR of TPF1 to the 125th position of E1 were constructed using the following synthetic genes.
- GBBC-s28 (SEQ ID NO: 59): 5′-ACCGGTGAGTACACCCGGAATTGCCAGACGACCGGGTCCCTTTCTTGGATCACCCGCTCCA-3 ′
- GBBC-s29 SEQ ID NO: 60): 5′-ATGCCTGGAGATTTGGGCGGTCCCCCCGCGAGACTGCTAGCCGAGTAGTGTTGGGTCGGCGA-3 ′
- GBBC-s30 (SEQ ID NO: 61): 5′-AAGGCCCTTGGTTACTGCCTGATAGGGGTCTTGCGAGTGCCCCGGGAGGTCTCGTAGACC-3 ′
- GBBC-s31 (SEQ ID NO: 62): 5′-GTGCATCATGCCTGTTTATTCTACTCAAACAAGTCCTGTACCTGCG
- phosphorylation was performed using T4 Polynucleotide Kinase (Takara Shuzo). These phosphorylated products were mixed and gradually cooled from 95 ° C. to room temperature to anneal each synthetic gene, and a ligation reaction was performed using Takara Ligation Kit (Takara Shuzo). The ligated product was subjected to blunting of double-stranded DNA ends using Klenow Fragment (Takara Shuzo).
- This double-stranded DNA is cloned into the pGEM-T easy vector, the nucleotide sequence is determined, and it is confirmed that the gene is from the core protein of GBV-B having the target gene TPF1 5'UTR to the 125th gene of E1. did.
- the gene fragment obtained by digesting the TPF1 5′UTR and GBV-B core protein synthesized above with the restriction enzyme AgeI-AvrII from the core protein of E1 to the 125th E1 is HCV / GBV-B chimeric plasmid pTPF / GBB-
- an HCV / GBV-B chimeric plasmid pTPF / GBB-C6 having a core protein of GBV-B to a p6 protein was constructed.
- Example 2 Proliferation of HCV / GBV-B chimeric gene in Huh7 cells
- the pTPF / GBB-C156E12 constructed in Example 1 was cleaved with XhoI, and using that as a template, Megascript T7 kit (Ambion) or Ampliscribe T7-Flash transcription kit (Epicentre) was used to synthesize RNA.
- RNA was purified by the method recommended by the manufacturer.
- Human liver cancer cells (Huh7, JCRB0403) were added to Dulbecco's modified Eagle medium (D-MEM, IWAKI) to 10% fetal bovine serum (FBS), penicillin to 50 U / mL and streptomycin to 50 ⁇ g / mL. Cultured at 37 ° C. with 5% carbon dioxide added. Cells before confluence were detached from the culture dish by trypsin and EDTA treatment, and trypsin was inactivated by resuspending in a serum-supplemented medium.
- D-MEM Dulbecco's modified Eagle medium
- FBS fetal bovine serum
- Cytomix 120 mM Potassium Chloride, 10 mM Potassium Phosphate, 5 mM Magnesium Chloride, 25 mM HEPES, 0.15 mM Calcium Chloride, 2 mMEG7, re-suspended in 2mMEG. Transfer to a 0.4 cm electroporation cuvette.
- RNA After adding 10 ⁇ g of RNA to the cells, cool on ice for 5 minutes. Pulse with an electroporator (Bio-Rad) at 960 ⁇ F, 250V. The transfected cells were immediately resuspended in 10 mL medium, and 1 mL each was seeded on a 12-well plate (diameter 22.1 mm), and culture was started. Culture supernatants were collected at 4, 24, 48 and 72 hours. The collected culture supernatant was centrifuged at 2 krpm for 10 minutes to collect the supernatant. 100 ⁇ L of the supernatant was measured using an HCV core antigen kit (Fujirebio, Lumipulse).
- the measured value of the core antigen in the experimental group (with electroporation) in which RNA was introduced into cells using an electroporator increased from 24 hours and increased after 72 hours.
- the control group no electroporation
- the measured value of the core antigen in the supernatant was below the detection limit.
- Example 3 Proliferation of HCV / GBV-B chimeric gene in marmoset primary liver cells
- Example 2 it was attempted to evaluate whether the HCV / GBV-B chimeric genotype that could replicate in Huh7 cells could replicate in marmoset primary liver cells.
- pTPF / GBB-C156E12 RNA was synthesized.
- the marmoset primary liver cells (BIOPREDIC INTERNATIONAL) were cultured by the method recommended by the manufacturer. Specifically, frozen marmoset primary hepatocytes were lysed in a 37 ° C water bath, and 1% GlutaMAX-I Supplement (Invitrogen) was added to Leibovitz's L-15 medium (Invitrogen) previously warmed to 37 ° C. In 30 mL of the culture broth.
- the supernatant of the cells was removed by centrifugation at 1 krpm (160 ⁇ g) for 1 minute, and the cell pellet was added to William's medium E (Invitrogen) with 1% Glutamax-I supplement (Invitrogen), 4 ⁇ g / mL Bovine insulin and 10% bovine. Resuspended to about 6 ⁇ 10 5 cells / mL with a culture solution containing fetal serum (FBS). The resuspended cells were seeded in a collagen type I-coated 24-well plate (diameter: 15.6 mm) at 0.5 mL each, 5% carbon dioxide was added, and culture was started at 37 ° C.
- Purified TPF / GBB-C156E12 and gene transfer reagent HilyMax were added at 2 ⁇ g and 4 ⁇ L per well to the marmoset primary liver cells cultured for 1 day, respectively, added with 5% carbon dioxide, and cultured at 37 ° C. for 4 hours. went.
- the gene transfer method was performed according to the method recommended by the manufacturer. After 4 hours of incubation, wash 3 times with PBS, add 1% Glutamax-I supplement (Invitrogen) to William's medium E (Invitrogen), add Bovine insulin and Hydrocortisone hemisuccinate to 4 ⁇ M / ml, and add 4 ⁇ M to 4 ⁇ M / ml.
- the culture was started at 37 ° C.
- culture supernatants were collected at 4 hours, 24 hours, 48 hours, 72 hours, 96 hours, 144 hours, 192 hours, 240 hours, 288 hours and 336 hours.
- the collected culture supernatant was centrifuged at 2 krpm for 10 minutes to collect the supernatant. 100 ⁇ L of the supernatant was measured using an HCV core antigen kit (Fujirebio, Lumipulse).
- the measured value of the core antigen was higher than that of the control group (no electroporation) at 24 hours, 144 hours and 240 hours.
- This result indicates that the HCV / GBV-B chimeric gene of the present invention continuously replicates in marmoset primary liver cells and sporadically secretes the core protein into the supernatant.
- Example 4 Infection of marmoset primary liver cells with HCV / GBV-B chimeric virus PTPF / GBB-C156E12, pTPF1 / GBB-v11E12, pTPF / GBB-v27E12 and pTPF / GBB-C6 constructed in Example 1 were cleaved with XhoI, and RNA was synthesized using the same method as in Example 2.
- Marmoset primary liver cells were cultured by the method described in Example 3. The resuspended cells were seeded on a collagen type I-coated 6-well plate (diameter: 34.6 mm) 2 mL each, 5% carbon dioxide added, and culture was started at 37 ° C.
- TPF / GBB chimeric RNA and gene transfer reagent HilyMax were added to each marmoset primary liver cell cultured for 1 day at 5 ⁇ g and 15 ⁇ L per well, respectively, 5% carbon dioxide was added, and cultured at 37 ° C. for 4 hours. .
- the gene transfer method was performed according to the method recommended by the manufacturer. After culturing for 4 hours, after washing 3 times with PBS, growth medium was added, and 5% carbon dioxide was added, and cultivation was started at 37 ° C. The culture supernatant was collected at 48 hours, and the collected culture supernatant was centrifuged at 2 krpm for 10 minutes to collect the supernatant. The collected culture supernatant was stored at ⁇ 80 ° C. until used for infection test.
- marmoset primary liver cells were newly lysed as infected cells and cultured on collagen type I-coated 6-well plates.
- 500 ⁇ L of the culture supernatant (diluted 5 times) collected 48 hours after gene introduction was added, and the cells were cultured at 37 ° C. for 6 hours with 5% carbon dioxide.
- the cells were washed 3 times with PBS, added with a growth medium, added with 5% carbon dioxide, and cultured at 37 ° C.
- Culture supernatants were collected at 24 hours, 48 hours, 72 hours, 96 hours, 120 hours, 144 hours, 168 hours, 192 hours and 216 hours.
- the collected culture supernatant was centrifuged at 2 krpm for 10 minutes to collect the supernatant.
- the presence or absence of reinfection of the TPF1 / GBB chimera was measured by quantitative RT-PCR based on the number of genomes of the chimeric virus contained in the culture supernatant.
- HCV animal models can be constructed by infecting the HCV / GBV-B chimeric virus of the present invention with small primates such as tamarin and marmoset. By using this animal model, it is possible to develop and evaluate pharmaceuticals that suppress or inhibit the severity of hepatitis, and to develop and evaluate more effective preventive and therapeutic agents for infection. .
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Genetics & Genomics (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Virology (AREA)
- Engineering & Computer Science (AREA)
- Medicinal Chemistry (AREA)
- Microbiology (AREA)
- Biotechnology (AREA)
- General Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Immunology (AREA)
- Gastroenterology & Hepatology (AREA)
- Biophysics (AREA)
- Molecular Biology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Peptides Or Proteins (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Description
このHCV/GBV-BキメラRNAの、ヒト肝がん由来細胞株における複製効率は、親株のHCVの複製効率と比較して上昇していた。すなわち、本発明者は、得られたHCV/GBV-BキメラRNAが、HCVの複製機能を充分維持していることを見出した。
更に、このHCV/GBV-BキメラRNAをマーモセットの初代肝細胞に導入したところ、HCV/GBV-BキメラRNAは細胞内で自律的に増殖し、細胞上清中にコア蛋白を持続的に放出した。すなわち、本発明者は、HCV/GBV-BキメラRNAをマーモセットの初代肝細胞にトランスフェクションすることで、再感染可能なHCV/GBV-Bキメラウイルスを産生できることを見出した。
本発明は、こうした知見に基づくものである。
本発明のHCV/GBV-BキメラRNAの好ましい態様においては、
(A)C型肝炎ウイルスの、5’非翻訳領域のRNAを含むHCV-5’側RNA、
(B)GBウイルス-Bの、E1タンパク質及びE2タンパク質をコードするRNAを含むGBV-B-RNA、並びに
(C)C型肝炎ウイルスの、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含むHCV-3’側RNA、
を含み、前記HCV-5’側RNA(A)及びHCV-3’側RNA(C)の間に、GBV-B-RNA(B)が挿入される。
本発明のHCV/GBV-BキメラRNAの別の好ましい態様においては、前記HCV-5’側RNA(A)が、5’非翻訳領域のRNA及びコアタンパク質の一部又は全部をコードするRNAを含み、
前記GBV-B-RNA(B)が、コアタンパク質の一部、E1タンパク質、E2タンパク質、及びp6タンパク質をコードするRNAを含み、
前記HCV-3’側RNA(C)が、p7タンパク質、NS2タンパク質、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含み、より好ましくは、配列番号55で表される塩基配列からなるRNAである。
また、本発明は、前記HCV/GBV-BキメラRNAの相補的なHCV/GBV-Bマイナス鎖キメラRNAに関する。
また、本発明は、前記HCV/GBV-BキメラRNAを含むHCV/GBV-Bキメラウイルスに関する。
また、本発明は、前記HCV/GBV-BキメラRNAをコードする、HCV/GBV-BキメラDNAに関する。
また、本発明は、前記RNA又は請求項7に記載のDNAから翻訳されるHCV/GBV-Bキメラタンパク質に関する。
また、本発明は、前記HCV/GBV-BキメラRNAを含む、HCV/GBV-BキメラRNA複製細胞に関する。
また、本発明は、前記HCV/GBV-BキメラRNA、又は請求項6に記載のHCV/GBV-Bキメラウイルスを接種された非ヒト動物に関する。
本明細書において、HCV/GBV-Bキメラ遺伝子は、HCV/GBV-BキメラRNA及びHCV/GBV-BキメラDNAを意味する。
本発明のHCV/GBV-Bキメラウイルスを用いることにより、小型霊長類であるタマリンやマーモセットを用いたHCV動物モデルを構築することができる。そして、この動物モデルを利用することにより、HCVの基礎研究はもとより、肝炎の重症化を抑制、又は阻害する医薬品の開発や評価を行うことができ、より有効な感染の予防薬及び治療薬の開発及び評価が可能となる。
また、本発明は、このHCV/GBV-Bキメラ遺伝子が複製する細胞を提供する。このHCV/GBV-Bキメラ遺伝子が複製している細胞のHCV/GBV-Bキメラ複製系を用いて、HCVの増殖を抑制する薬剤のスクリーニングができる。また、動物モデルはスクリーニングされた薬剤の効果を評価する方法としても有効である。この場合、薬剤の評価をこの方法で行うことが重要であり、薬剤の管理に必須であれば、薬剤を製造する方法としても利用できる。
第1804番のロイシン及び第1966番のリジンのそれぞれのアミノ酸番号は、3010個のアミノ酸からなるC型肝炎ウイルスの全長のポリプロテインにおけるアミノ酸番号を示している。第1804番のロイシン及び第1966番のリジンは、NS4Bタンパク質に含まれるアミノ酸である。本発明者らは、先にこれらのアミノ酸をコードする塩基配列を含むC型肝炎ウイルスのRNAを報告した(特許文献1)が、それまで、これらのアミノ酸を含むNS4Bタンパク質は報告されていなかった。従って、これらのアミノ酸を含むHCVポリプロテイン、これらのアミノ酸をコードするポリヌクレオチドを含むRNAレプリコンも報告されていなかった。
(A)HCVの5’側RNA
HCVの5’側のRNAは、少なくともHCVの5’非翻訳領域のRNAを含む。更に、HCVのコアタンパク質の一部又は全部をコードするRNAを含むことができる。
HCVの遺伝子においては、例えば、一般的な遺伝子型1bのHCV遺伝子は、5’非翻訳領域のRNA(第1番~第341番:以下、5’UTRと称することがある)と、それに続いて、前記のウイルス構造タンパク質であるコアタンパク質をコードするRNA(第342番~第914番)、E1タンパク質をコードするRNA(第915番~第1490番)、及びE2タンパク質をコードするRNA(第1491番~第2579番)、並びに非構造タンパク質であるp7タンパク質をコードするRNA(第2580番~第2768番)、NS2タンパク質をコードするRNA(第2769番~第3419番)、NS3蛋白をコードするRNA(第3420番~第5312番)、NS4Aタンパク質をコードするRNA(第5313番~第5474番)、NS4Bタンパク質をコードするRNA(第5475番~第6257番)、NS5Aタンパク質をコードするRNA(第6258番~第7598番)、及びNS5Bタンパク質をコードするRNA(第7599番~第9371番)と、更に3’非翻訳領域のRNA(第9372番以降:以下、3’UTRと称することがある)とからなっている。
また、コアタンパク質をコードするRNAは、第342番~第914番の573個のヌクレオチドからなり、HCVの5’側のRNAは、その全部又は一部のヌクレオチドを含むことができる。
HCVの5’側RNAの塩基配列は、特に限定されるものではないが、配列番号55の相当する領域の塩基配列に対して、好ましくは90%以上、より好ましくは93%以上、最も好ましくは95%以上の相同性を有する。HCV/GBV-BキメラRNAは、HCVの5’側RNAを含むことにより、5’UTRのRNA又はコアタンパク質をコードするRNAの機能を阻害する薬剤をスクリーニングすることができる。
GBV-B-RNAは、少なくともE1タンパク質をコードするRNA、E2タンパク質をコードするRNAを含むことが好ましい。更に、コアタンパク質をコードするRNAの一部又は全部、及び/又はp6タンパク質をコードするRNAの一部又は全部を含むことができる。
GBV-Bの遺伝子は、5’非翻訳領域のRNA(第1番~第445番:以下、5’UTRと称することがある)と、それに続いて、ウイルスの構造タンパク質であるコアタンパク質をコードするRNA(第446番~第913番)、E1タンパク質をコードするRNA(第914番~第1489番)、及びE2タンパク質をコードするRNA(第1490番~第2284番)、並びに非構造タンパク質であるp6タンパク質をコードするRNA(第2285番~第2452番)、p7タンパク質をコードするRNA(第2453番~第2641番)、NS2タンパク質をコードするRNA(第2642番~第3265番)、NS3蛋白をコードするRNA(第3266番~第5125番)、NS4Aタンパク質をコードするRNA(第5126番~第5290番)、NS4Bタンパク質をコードするRNA(第5291番~第6034番)、NS5Aタンパク質をコードするRNA(第6035番~第7267番)、及びNS5Bタンパク質をコードするRNA(第7268番~第9037番)と、更に3’非翻訳領域のRNA(第9038番以降:以下、3’UTRと称することがある)とからなっている。HCVの遺伝子との構造上の違いは、GBV-Bがp6タンパク質をコードする領域を有していることである。
E1タンパク質をコードするRNA、E2タンパク質をコードするRNAを含むことにより、HCV/GBV-BキメラRNAは、タマリン及びマーモセットなどの実験動物、又はこれらの動物由来の細胞に感染することが可能になる。
更に、p6タンパク質は、第2285番~第2452番の168個のヌクレオチドからなり、GBV-B-RNAは、その全部又は一部のヌクレオチドを含むことができる。
GBV-B-RNAの塩基配列は、翻訳されたGBV-Bのタンパク質としての機能、すなわち、産生されたキメラウイルスがタマリン及びマーモセットなどの実験動物への感染能を有する限り、特に限定されない。
HCVの3’側のRNAは、少なくともNS3タンパク質をコードするRNA、NS4Aタンパク質をコードするRNA、NS4Bタンパク質をコードするRNA、NS5Aタンパク質をコードするRNA、及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含む。更に、HCVのp7タンパク質をコードするRNA、NS2タンパク質をコードするRNAを含むことができる。
p7タンパク質をコードするRNAは、第2580番~第2768番の189個のヌクレオチドからなり、その全部又は一部のヌクレオチドを含むことができる。NS2タンパク質をコードするRNAは、第2769番~第3419番の651個のヌクレオチドからなり、その全長のヌクレオチドを含むことができる。
NS3タンパク質をコードするRNAは、第3420番~第5312番の1893個のヌクレオチドからなり、その全長のヌクレオチドを含むことが好ましい。
NS4Aタンパク質をコードするRNAは、第5313番~第5474番の162個のヌクレオチドからなり、その全長のヌクレオチドを含むことが好ましい。
NS4Bタンパク質をコードするRNAは、第5475番~第6257番の783個のヌクレオチドからなり、その全長のヌクレオチドを含むことが好ましい。
NS5Aタンパク質をコードするRNAは、第6258番~第7598番の1341個のヌクレオチドからなり、その全長のヌクレオチドを含むことが好ましい。
NS5Bタンパク質をコードするRNAは、第7599番~第9371番の1773個のヌクレオチドからなり、その全長のヌクレオチドを含むことが好ましい。
3’UTRのRNAは、第9372番以降のRNAであり、ウイルス株によってその長さは異なるが、通常41ヌクレオチドの可変領域、株により長さの異なるポリU領域、及び98ヌクレオチドの3’X領域からなる。HCVの3’側RNAは、その全長の3’UTRを含むことが好ましい。
HCV/GBV-BキメラRNAは、GBV-Bのp6タンパク質をコードするRNAの全部又は一部、HCVのp7タンパク質をコードするRNAの全部又は一部、及び/又はNS2タンパク質をコードするRNAの全部又は一部を含むことができる。
HCVの3’側RNAの塩基配列は、特に限定されるものではないが、配列番号55の相当する領域の塩基配列に対して、好ましくは80%以上、より好ましくは90%以上、最も好ましくは95%以上の相同性を有する。
前記のHCV/GBV-BキメラRNAをコードするDNAを、常法によりクローニングベクターに挿入して、DNAクローンを作製する。得られたDNAをRNAプロモーターの下流に挿入して、レプリコンRNAを産生することのできるDNAクローンを作製する。より具体的には、例えば、劇症C型肝炎患者から単離されたTPF1クローン(特許文献1)のコア蛋白156番目からE2蛋白までを欠失した遺伝子を構築し、GBV-Bのコア蛋白124番目からp6蛋白までの遺伝子を化学合成し、HCVの欠失させた部分に挿入・連結し、HCV/GBV-Bキメラ遺伝子を構築することができる。前記RNAプロモーターは、プラスミドクローン中に含まれるものであることが好ましい。RNAプロモーターとしては、限定するものではないが、T7 RNAプロモーター、SP6 RNAプロモーター、SP3 RNAプロモーターが挙げられ、T7 RNAプロモーターが特に好ましい。
(A)C型肝炎ウイルスの、5’非翻訳領域のRNA並びにコアタンパク質及びE1タンパク質の一部をコードするRNAを含むHCV-5’側RNA、
(B)GBウイルス-Bの、E1タンパク質の一部及びE2タンパク質をコードするRNAを含むGBV-B-RNA、並びに
(C)C型肝炎ウイルスの、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含み、好ましくは、p7タンパク質、NS2タンパク質、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含むHCV-3’側RNA、
を含む。そして、前記HCV-5’側RNA(A)及びHCV-3’側RNA(C)の間に、GBV-B-RNA(B)が挿入され、前記HCV-5’側RNA(A)によりコードされるE1タンパク質の一部は、E1タンパク質のN末端側の一部分であり、前記GBV-B-RNA(B)によりコードされるE1タンパク質の一部は、E1タンパク質のC末端側の一部分であり、これらの両方の部分の融合によりE1タンパク質の全長がカバーされる。
(A)C型肝炎ウイルスの、5’非翻訳領域のRNAを含むHCV-5’側RNA、
(B)GBウイルス-Bの、E1タンパク質及びE2タンパク質をコードするRNAを含むGBV-B-RNA、並びに
(C)C型肝炎ウイルスの、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含み、好ましくは、p7タンパク質、NS2タンパク質、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含むHCV-3’側RNA、
を含む。
具体的には、複製細胞と試験物質を接触させ、HCV/GBV-BキメラRNAの増加度を分析することによって試験物質のスクリーニングを行うことができる。HCV/GBV-BキメラRNAの増加度とは、レプリコンRNAの複製の速度又は量の変化を意味する。具体的には、複製細胞中のHCV/GBV-BキメラRNAの量を検出又は測定し、対照の被検物質と接触しない複製細胞のHCV/GBV-BキメラRNAの量と比較することによって、被検物質をスクリーニングすることができる。また、細胞中又は上清中のC型肝炎ウイルスのタンパク質、GBV-Bのタンパク質、又はHCV/GBV-Bキメラタンパク質の量を検出又は測定し、対照の被検物質と接触しない複製細胞のそれと比較することによっても、被検物質をスクリーニングすることが可能である。スクリーニングにおいて検出又は測定することのできるC型肝炎ウイルスタンパク質は、特に限定されないが、好ましくは、コアタンパク質であり、市販のキットを用いてコアタンパク質を測定することも可能である。また、スクリーニング方法を自動化することによって、ハイスループットのスクリーニング方法に適応することも可能である。
非ヒトの実験動物としては、HCV/GBV-Bキメラウイルスが複製又は感染するものであれば、特に限定されないが、好ましくは小型霊長類であり、より好ましくはマーモセット又はタマリンである。
例えば、実験動物に試験物質を投与し、HCV/GBV-Bキメラウイルスの増加度、肝炎の発症などを分析することによって試験物質のスクリーニング又は評価を行うことができる。
本発明のHCV/GBV-BキメラRNAに用いるHCVのRNAは、C型肝炎ウイルスのポリプロテインのアミノ酸配列における第1804番のロイシン及び第1966番のリジンを含むNS4Bタンパク質をコードするRNAを含む。一般的なHCVでは、第1804番のアミノ酸はグルタミンであり、第1966番のアミノ酸はグルタミン酸であるが、第1804番のロイシン及び第1966番のリジンと置換されることにより、RNAの複製効率が驚異的に上昇する。そのため、前記RNAを含むキメラウイルスは、タマリンの細胞、若しくは生体内、又はマーモセットの細胞若しくは生体内での複製及び増殖の効率が高いと考えられる。前記のHCVのRNAは、キメラウイルスでない場合でも、タマリンやマーモセットの細胞で複製することができると考えられるが、GBV-BのRNAとのキメラRNAとすることによって、複製効率又は感染効率が上昇すると考えられる。特に、第1804番のロイシン及び第1966番のリジンを含む、HCVの遺伝子型1bのRNAにおいて、複製効率が上昇すると考えられるため、キメラRNAに用いるHCVのRNAは、遺伝子型1bが好ましい。更に、本発明のHCV/GBV-BキメラRNA、又はHCV/GBV-Bキメラウイルスは、Huh-7の細胞における複製機能を有しており、HCVとしての複製機能を維持していると考えられる。そのため、本発明の非ヒト動物は、HCVの予防薬及び治療薬の開発するために有用である。
(A)血清からのRNAの抽出
劇症肝炎患者の急性期に採取した血清250μLより、High Pure Viral Nucleic Acid Kit (Roche diagnostics corporation)を用い、メーカーの推奨する方法に従い、RNAを精製した。
精製したRNAにXR58Rプライマーを加え、SuperSucript II reverse transcriptase (Invitrogen社)により、メーカーの推奨する方法に従い、42℃、1時間逆転写反応を行わせ、cDNAを得た。得られた反応液にRNaseH(Invitrogen)を加え、37℃、30分反応させ、RNAを分解した。この反応液を、HC-LongA1プライマーと1b9405Rプライマー及びTakara LA Taq DNA polymerase (宝酒造)を用い、94℃、20秒、68℃、9分間からなる30回のサーマルサイクル反応によるポリメラーゼチェインリアクション(PCR)を行い、cDNAを増幅した。更に、得られた反応液の一部を、HC85FとHC9302Rプライマーを用いてPCRを行い、HCV cDNAを増幅した。
増幅したDNA断片は、0.7%アガロースゲルを用い電気泳動によって分離し、QIAquick gel purification kit (QIAGEN社)を用い、メーカーの推奨する方法に従って、DNA断片を回収した。回収したDNA断片は、pGEM-T easyベクター(Promega社)と連結反応させ、そのプラスミドによりDH5α株を形質転換した。アンピシリン耐性の形質転換体を選択し、2YT培地を用いて培養した。培養した菌体からWizard Plus SV Miniprep DNA Purification Systemを用いプラスミドを精製した。
HCV cDNAの塩基配列は、HCVの遺伝子型1bの塩基配列に基づいて設計したプライマーを用い、決定した。CEQ DTCS Quick Start Kit(ベックマン・コールター)を用い、メーカーの推奨する方法に従い、反応を行い、CEQ2000 XL DNA analysis system (Software version 4.0.0、ベックマン・コールター)により解析した。得られたデータをSequencher (Version 4.1.2、Gene Codes Corporation)により解析した。得られたHCVクローンをpTPF1-0193と命名した。
更に、前記の(A)の工程で得られたRNAより、5’RACE法により、5’非翻訳領域の末端のcDNAを取得した。5’RACE System for Rapid Amplification of cDNA Ends, Version2.0 (Invitrogen社)のキットを用い、添付の指示書に従って、実施した。
cDNA合成のためのアンチセンスプライマーは、Chiba-asを使用した。SuperScript II Reverse Transcriptase(Invitrogen)でcDNAを合成し、S.N.A.P columnで精製後、cDNAにTdT-tailing反応を行い、dCTPを付加した。キットに添付の5’RACE Abridged Anchorプライマー及びKY78プライマーでTakara LA Taq DNA polymerase(宝酒造)を用いて、1回目のPCRを行った。このPCR産物の一部を鋳型として、キットに添付のUTPプライマーとKM2プライマーで、Takara LA Taq DNA polymerase(宝酒造)を用いて2回目のPCRを行い、PCR産物を得た。このPCR産物をpGEM-T easyベクターにクローニングし、前記(D)の工程に従い、塩基配列を決定した。得られた配列における第1位から第709位までを含むHCV cDNAクローンをpTPF1-0007と命名した。
前記の(A)の工程で得られたRNAより、3’RACE法により、3’非翻訳領域の末端のcDNAを取得した。まず、患者のRNAにPoly(A) Tailing Kit(Ambion)を用いて、添付の指示書に従い、Poly(A)を付加した。XR58Rプライマーの代わりにdT-Adpプライマーを、1st PCRのプライマーとして3UTR-1Fプライマー及びAdpプライマーを、2nd PCRのプライマーとしてXR58F及びAdpプライマーを用いた以外は、前記工程(B)~(D)の操作を繰り返した。得られたHCV cDNAクローンを pTPF1-8994と命名した。
C型肝炎ウイルスTPF1株の全長のポリヌクレオチドを、pBluescriptIISK(+)のT7 RNAプロモーター配列の下流に挿入した(以下、pTPF1と称する)。
レプリコンRNAの自律複製が起こっていることは、細胞中にHCV RNAの5’UTR領域のマイナス鎖が検出できるか否かで調べた。マイナス鎖の特異的な定量法は特願平08-187097号公報に記載のマイナス鎖RNAの特異的検出法と同様の方法で行った。
pRepTPF-1を鋳型にin vitroで合成したRNAをエレクトロポレーションで導入した細胞から、有意な量のマイナス鎖が検出でき、細胞内においてレプリコンRNAが自律的に複製していることが確認された。
参考例2に従って、pRepTPF1を鋳型にin vitroで合成したRNAをHuh7細胞へトランスフェクションすることで樹立したレプリコンRNA複製細胞株から、ISOGEN(日本ジーン)を用いて、メーカーの推奨する条件に従い細胞内RNAを抽出した。
参考例2において作成した完全長HCV DNA pTPF1を制限酵素SfiIで切断し、その切断部位に、pRep4Bを制限酵素SfiIで切断した断片を連結挿入することで、適応変異が挿入された完全長HCV DNA pTPF1/4Bを作製した。この塩基配列(RNAで 表記)を配列番号57、これがコードするアミノ酸配列を配列番号58に示す。
(1)C156キメラ遺伝子(配列番号55)
ヒト肝がん細胞株で増殖が確認されているHCV遺伝子を含む上記pTPF1/4BをAge Iプライマー5’-GGAACCGGTGAGTACACCGGAATTGCCAGG-3’(配列番号101)とSpl Iプライマーの5’-ACCCGTACGCCATGCGCCAGGGCCCTGGCAG-3’(配列番号102)の存在下で、Takara EX Taq DNA polymerase(宝酒造)を用い、94℃、20秒、68℃、30秒間からなる20回のサーマルサイクル反応によるポリメラーゼチェインリアクション(PCR)を行うことにより、TPF1ゲノムの5’UTRからコア蛋白の156番目までを増幅した。
GBBC-s1(配列番号1):5’-CGTACGCTTGCTGGAGGATGGAGTCAACTGGGCTACTGGTTGGTTCGGTGTCCACCTTTT-3’
GBBCE1-s2(配列番号2):5’-TGTGGTATGTCTGCTATCTTTGGCCTGTCCCTGTAGTGGGGCGCGGGTCACTGACCCAGA-3’
GBBE1-s3(配列番号3):5’-CACAAATACCACAATCCTGACCAATTGCTGCCAGCGTAATCAGGTTATCTATTGTTCTCC-3’
GBBE1-s4(配列番号4):5’-TTCCACTTGCCTACACGAGCCTGGTTGTGTGATCTGTGCGGACGAGTGCTGGGTTCCCGC-3’
GBBE1-s5(配列番号5):5’-CAATCCGTACATCTCACACCCTTCCAATTGGACTGGCACGGACTCCTTCTTGGCTGACCA-3’
GBBE1-s6(配列番号6):5’-CATTGATTTTGTTATGGGCGCTCTTGTGACCTGTGACGCCCTTGACATTGGTGAGTTGTG-3’
GBBE1-s7(配列番号7):5’-TGGTGCGTGTGTATTAGTCGGTGACTGGCTTGTCAGGCACTGGCTTATTCACATAGACCT-3’
GBBE1-s8(配列番号8):5’-CAATGAAACTGGTACTTGTTACCTGGAAGTGCCCACTGGAATAGATCCTGGGTTCCTAGG-3’
GBBE1-s9(配列番号9):5’-GTTTATCGGGTGGATGGCCGGCAAGGTCGAGGCTGTCATCTTCTTGACCAAACTGGCTTC-3’
GBBE1-s10(配列番号10):5’-ACAAGTACCATACGCTATTGCGACTATGTTTAGCAGTGTACACTACCTGGCGGTTGGCGC-3’
GBBE1-s11(配列番号11):5’-TCTGATCTACTATGCCTCTCGGGGCAAGTGGTATCAGTTGCTCCTAGCGCTTATGCTTTA-3’
GBBE12-s12(配列番号12):5’-CATAGAAGCGACCTCTGGAAACCCCATCAGGGTGCCCACTGGATGCTCAATAGCTGAGTT-3’
GBBE2-s13(配列番号13):5’-TTGCTCGCCTTTGATGATACCATGTCCTTGCCACTCTTATTTGAGTGAGAATGTGTCAGA-3’
GBBE2-s14(配列番号14):5’-AGTCATTTGTTACAGTCCAAAGTGGACCAGGCCTATCACTCTAGAGTATAACAACTCCAT-3’
GBBE2-s15(配列番号15):5’-ATCTTGGTACCCCTATACAATCCCTGGTGCGAGGGGATGTATGGTTAAATTCAAAAATAA-3’
GBBE2-s16(配列番号16):5’-CACATGGGGTTGCTGCCGTATTCGCAATGTGCCATCGTACTGCACTATGGGCACTGATGC-3’
GBBE2-s17(配列番号17):5’-AGTGTGGAACGACACTCGCAACACTTACGAAGCATGCGGTGTAACACCATGGCTAACAAC-3’
GBBE2-s18(配列番号18):5’-CGCATGGCACAACGGCTCAGCCCTGAAATTGGCTATATTACAATACCCTGGGTCTAAAGA-3’
GBBE2-s19(配列番号19):5’-AATGTTTAAACCTCATAATTGGATGTCAGGCCATTTGTATTTTGAGGGATCAGATACCCC-3’
GBBE2-s20(配列番号20):5’-TATAGTTTACTTTTATGACCCTGTGAATTCCACTCTCCTACCACCGGAGAGGTGGGCTAG-3’
GBBE2-s21(配列番号21):5’-GTTGCCCGGTACCCCACCTGTGGTACGTGGTTCTTGGTTACAGGTTCCGCAAGGGTTTTA-3’
GBBE2-s22(配列番号22):5’-CAGTGATGTGAAAGACCTAGCCACAGGATTGATCACCAAAGACAAAGCCTGGAAAAATTA-3’
GBBE2-s23(配列番号23):5’-TCAGGTCTTATATTCCGCCACGGGTGCTTTGTCTCTTACGGGAGTTACCACCAAGGCCGT-3’
GBBE2-s24(配列番号24):5’-GGTGCTAATTCTGTTGGGGTTGTGTGGCAGCAAGTATCTTATTTTAGCCTACCTCTGTTA-3’
GBBE2P6-s25(配列番号25):5’-CTTGTCCCTTTGTTTTGGGCGCGCTTCTGGTTACCCTTTGCGTCCTGTGCTCCCATCCCA-3’
GBBP6-s26(配列番号26):5’-GTCGTATCTCCAAGCTGGCTGGGATGTTTTGTCTAAAGCTCAAGTAGCTCCTTTTGCTTT-3’
GBBP6-s27(配列番号27):5’-GATTTTCTTCATCTGTTGCTATCTCCGCTGCAGGCTACGTTATGCTGCCCTTTTAGGGTT-3’
GBBP6-as1(配列番号28):5’-GCCCGCAGCCATGGGCACAAACCCTAAAAGGGCAGCATAACGTAGCCTG-3’
GBBP6-as2(配列番号29):5’-CAGCGGAGATAGCAACAGATGAAGAAAATCAAAGCAAAAGGAGCTACTTGAGCTTTAGAC-3’
GBBP6-as3(配列番号30):5’-AAAACATCCCAGCCAGCTTGGAGATACGACTGGGATGGGAGCACAGGACGCAAAGGGTAA-3’
GBBE2-as4(配列番号31):5’-CCAGAAGCGCGCCCAAAACAAAGGGACAAGTAACAGAGGTAGGCTAAAATAAGATACTTG-3’
GBBE2-as5(配列番号32):5’-CTGCCACACAACCCCAACAGAATTAGCACCACGGCCTTGGTGGTAACTCCCGTAAGAGAC-3’
GBBE2-as6(配列番号33):5’-AAAGCACCCGTGGCGGAATATAAGACCTGATAATTTTTCCAGGCTTTGTCTTTGGTGATC-3’
GBBE2-as7(配列番号34):5’-AATCCTGTGGCTAGGTCTTTCACATCACTGTAAAACCCTTGCGGAACCTGTAACCAAGAA-3’
GBBE2-as8(配列番号35):5’-CCACGTACCACAGGTGGGGTACCGGGCAACCTAGCCCACCTCTCCGGTGGTAGGAGAGTG-3’
GBBE2-as9(配列番号36):5’-GAATTCACAGGGTCATAAAAGTAAACTATAGGGGTATCTGATCCCTCAAAATACAAATGG-3’
GBBE2-as10(配列番号37):5’-CCTGACATCCAATTATGAGGTTTAAACATTTCTTTAGACCCAGGGTATTGTAATATAGCC-3’
GBBE2-as11(配列番号38):5’-AATTTCAGGGCTGAGCCGTTGTGCCATGCGGTTGTTAGCCATGGTGTTACACCGCATGCT-3’
GBBE2-as12(配列番号39):5’-TCGTAAGTGTTGCGAGTGTCGTTCCACACTGCATCAGTGCCCATAGTGCAGTACGATGGC-3’
GBBE2-as13(配列番号40):5’-ACATTGCGAATACGGCAGCAACCCCATGTGTTATTTTTGAATTTAACCATACATCCCCTC-3’
GBBE2-as14(配列番号41):5’-GCACCAGGGATTGTATAGGGGTACCAAGATATGGAGTTGTTATACTCTAGAGTGATAGGC-3’
GBBE2-as15(配列番号42):5’-CTGGTCCACTTTGGACTGTAACAAATGACTTCTGACACATTCTCACTCAAATAAGAGTGG-3’
GBBE2-as16(配列番号43):5’-CAAGGACATGGTATCATCAAAGGCGAGCAAAACTCAGCTATTGAGCATCCAGTGGGCACC-3’
GBBE21-as17(配列番号44):5’-CTGATGGGGTTTCCAGAGGTCGCTTCTATGTAAAGCATAAGCGCTAGGAGCAACTGATAC-3’
GBBE1-as18(配列番号45):5’-CACTTGCCCCGAGAGGCATAGTAGATCAGAGCGCCAACCGCCAGGTAGTGTACACTGCTA-3’
GBBE1-as19(配列番号46):5’-AACATAGTCGCAATAGCGTATGGTACTTGTGAAGCCAGTTTGGTCAAGAAGATGACAGCC-3’
GBBE1-as20(配列番号47):5’-TCGACCTTGCCGGCCATCCACCCGATAAACCCTAGGAACCCAGGATCTATTCCAGTGGGC-3’
GBBE1-as21(配列番号48):5’-ACTTCCAGGTAACAAGTACCAGTTTCATTGAGGTCTATGTGAATAAGCCAGTGCCTGACA-3’
GBBE1-as22(配列番号49):5’-AGCCAGTCACCGACTAATACACACGCACCACACAACTCACCAATGTCAAGGGCGTCACAG-3’
GBBE1-as23(配列番号50):5’-GTCACAAGAGCGCCCATAACAAAATCAATGTGGTCAGCCAAGAAGGAGTCCGTGCCAGTC-3’
GBBE1-as24(配列番号51):5’-CAATTGGAAGGGTGTGAGATGTACGGATTGGCGGGAACCCAGCACTCGTCCGCACAGATC-3’
GBBE1-as25(配列番号52):5’-ACACAACCAGGCTCGTGTAGGCAAGTGGAAGGAGAACAATAGATAACCTGATTACGCTGG-3’
GBBE1C-as26(配列番号53):5’-CAGCAATTGGTCAGGATTGTGGTATTTGTGTCTGGGTCAGTGACCCGCGCCCCACTACAG-3’
GBBC-as27(配列番号54):5’-GGACAGGCCAAAGATAGCAGACATACCACAAAAAGGTGGACACCGAACCAACCAGTAGCCCA-3’
pTPF1/4Bを前述のAge IプライマーとEcoR V(v11)プライマーの5’-GATATCGTACAGCCCGGATACGTTGCGCAC-3’(配列番号103)の存在下で、Takara EX Taq DNA polymerase(宝酒造)を用い、94℃、20秒、68℃、30秒間からなる20回のサーマルサイクル反応によるPCRを行うことにより、TPF1ゲノムの5’UTRからE1蛋白の11番目までを増幅した。この増幅産物を実施例1でHCV遺伝子断片(pTPF1-AgeSpl)を取得したのと同様の手法を用いpGEM-Teasyベクターと連結反応を行い、常法に従い配列を決定した。その結果、pTPF1-AgeEcoR(v11)の塩基配列を確認した。
上記pTPF1/4Bを前述のAge IプライマーとEcoR V(v27)プライマーの5’-GATATCCGCTGCCTCATACACAATGCTTGA-3’(配列番号106)の存在下で、Takara EX Taq DNA polymerase(宝酒造)を用い、94℃、20秒、68℃、90秒間からなる20回のサーマルサイクル反応によるPCRを行うことにより、TPF1ゲノムの5’UTRからE1蛋白の27番目までを増幅した。この増幅産物を実施例1でHCV遺伝子断片(pTPF1-AgeSpl)を取得したのと同様の手法を用いpGEM-Teasyベクターと連結反応を行い、常法に従い配列を決定した。その結果、pTPF1-AgeEcoR(v27)の塩基配列を確認した。
TPF1の5‘UTRを有するGBV-Bのコア蛋白からE1の125番目までの遺伝子を以下の合成遺伝子を用いて構築した。
GBBC-s28(配列番号59):5‘-ACCGGTGAGTACACCGGAATTGCCAGGACGACCGGGTCCTTTCTTGGATCAACCCGCTCA-3’
GBBC-s29(配列番号60):5‘-ATGCCTGGAGATTTGGGCGTGCCCCCGCGAGACTGCTAGCCGAGTAGTGTTGGGTCGCGA-3’
GBBC-s30(配列番号61):5‘-AAGGCCTTGTGGTACTGCCTGATAGGGTGCTTGCGAGTGCCCCGGGAGGTCTCGTAGACC-3’
GBBC-s31(配列番号62):5‘-GTGCATCATGCCTGTTATTTCTACTCAAACAAGTCCTGTACCTGCGCCCAGAACGCGCAA-3’
GBBC-s32(配列番号63):5‘-GAACAAGCAGACGCAGGCTTCATATCCTGTGTCCATTAAAACATCTGTTGAAAGGGGACA-3’
GBBC-s33(配列番号64):5‘-ACGAGCAAAGCGCAAAGTCCAGCGCGATGCTCGGCCTCGTAATTACAAAATTGCTGGTAT-3’
GBBC-s34(配列番号65):5‘-CCATGATGGCTTGCAGACATTGGCTCAGGCTGCTTTGCCAGCTCATGGTTGGGGACGCCA-3’
GBBC-s35(配列番号66):5‘-AGACCCTCGCCATAAGTCTCGCAATCTTGGAATCCTTCTGGATTACCCTTTGGGGTGGAT-3’
GBBC-s36(配列番号67):5‘-TGGTGATGTTACAACTCACACACCTCTAGTAGGCCCGCTGGTGGCAGGAGCGGTCGTTCG-3’
GBBC-s37(配列番号68):5‘-ACCAGTCTGCCAGATAGTACGCTTGCTGGAGGATGGAGTCAACTGGGCTACTGGTTGGTT-3’
GBBC-s38(配列番号69):5‘-CGGTGTCCACCTTTTTGTGGTATGTCTGCTATCTTTGGCCTGTCCCTGTAGTGGGGCGCG-3’
GBBC-s39(配列番号70):5‘-GGTCACTGACCCAGACACAAATACCACAATCCTGACCAATTGCTGCCAGCGTAATCAGGT-3’
GBBC-s40(配列番号71):5‘-TATCTATTGTTCTCCTTCCACTTGCCTACACGAGCCTGGTTGTGTGATCTGTGCGGACGA-3’
GBBC-s41(配列番号72):5‘-GTGCTGGGTTCCCGCCAATCCGTACATCTCACACCCTTCCAATTGGACTGGCACGGACTC-3’
GBBC-s42(配列番号73):5‘-CTTCTTGGCTGACCACATTGATTTTGTTATGGGCGCTCTTGTGACCTGTGACGCCCTTGA-3’
GBBC-s43(配列番号74):5‘-CATTGGTGAGTTGTGTGGTGCGTGTGTATTAGTCGGTGACTGGCTTGTCAGGCACTGGCT-3’
GBBC-s44(配列番号75):5‘-TATTCACATAGACCTCAATGAAACTGGTACTTGTTACCTGGAAGTGCCCACTGGAATAGA-3’
GBBC-as28(配列番号76):5‘-CCTAGGAACCCAGGATCTATTCCAGTGGGCACTTCCAGGTAACAAGTACCAGTTTCATTG-3’
GBBC-as29(配列番号77):5‘-AGGTCTATGTGAATAAGCCAGTGCCTGACAAGCCAGTCACCGACTAATACACACGCACCA-3’
GBBC-as30(配列番号78):5‘-CACAACTCACCAATGTCAAGGGCGTCACAGGTCACAAGAGCGCCCATAACAAAATCAATG-3’
GBBC-as31(配列番号79):5‘-TGGTCAGCCAAGAAGGAGTCCGTGCCAGTCCAATTGGAAGGGTGTGAGATGTACGGATTG-3’
GBBC-as32(配列番号80):5‘-GCGGGAACCCAGCACTCGTCCGCACAGATCACACAACCAGGCTCGTGTAGGCAAGTGGAA-3’
GBBC-as33(配列番号81):5‘-GGAGAACAATAGATAACCTGATTACGCTGGCAGCAATTGGTCAGGATTGTGGTATTTGTG-3’
GBBC-as34(配列番号82):5‘-TCTGGGTCAGTGACCCGCGCCCCACTACAGGGACAGGCCAAAGATAGCAGACATACCACA-3’
GBBC-as35(配列番号83):5‘-AAAAGGTGGACACCGAACCAACCAGTAGCCCAGTTGACTCCATCCTCCAGCAAGCGTACT-3’
GBBC-as36(配列番号84):5‘-ATCTGGCAGACTGGTCGAACGACCGCTCCTGCCACCAGCGGGCCTACTAGAGGTGTGTGA-3’
GBBC-as37(配列番号85):5‘-GTTGTAACATCACCAATCCACCCCAAAGGGTAATCCAGAAGGATTCCAAGATTGCGAGAC-3’
GBBC-as38(配列番号86):5‘-TTATGGCGAGGGTCTTGGCGTCCCCAACCATGAGCTGGCAAAGCAGCCTGAGCCAATGTC-3’
GBBC-as39(配列番号87):5‘-TGCAAGCCATCATGGATACCAGCAATTTTGTAATTACGAGGCCGAGCATCGCGCTGGACT-3’
GBBC-as40(配列番号88):5‘-TTGCGCTTTGCTCGTTGTCCCCTTTCAACAGATGTTTTAATGGACACAGGATATGAAGCC-3’
GBBC-as41(配列番号89):5‘-TGCGTCTGCTTGTTCTTGCGCGTTCTGGGCGCAGGTACAGGACTTGTTTGAGTAGAAATA-3’
GBBC-as42(配列番号90):5‘-ACAGGCATGATGCACGGTCTACGAGACCTCCCGGGGCACTCGCAAGCACCCTATCAGGCA-3’
GBBC-as43(配列番号91):5‘-GTACCACAAGGCCTTTCGCGACCCAACACTACTCGGCTAGCAGTCTCGCGGGGGCACGCC-3’
GBBC-as44(配列番号92):5‘-CAAATCTCCAGGCATTGAGCGGGTTGATCCAAGAAAGGACCCGGTCGTCCTGGCAATTCC-3’
実施例1において構築したpTPF/GBB-C156E12をXhoIで切断し、それを鋳型に、Megascript T7 kit(Ambion)又はAmpliScribe T7-Flash transcription kit(Epicentre)を用いてRNAを合成した。メーカーの推奨する方法にてRNAを精製した。
実施例2においてHuh7細胞において複製可能であったHCV/GBV-Bキメラ遺伝子型が、マーモセット初代肝臓細胞において複製可能か評価を試みた。実施例2と同様の方法を用いてpTPF/GBB-C156E12のRNAを合成した。
実施例1において構築したpTPF/GBB-C156E12、pTPF1/GBB-v11E12、pTPF/GBB-v27E12およびpTPF/GBB-C6をXhoIで切断し、実施例2と同様の方法を用いてRNAを合成した。
Claims (19)
- C型肝炎ウイルスのRNA及びGBウイルス-BのRNAを含むHCV/GBV-BキメラRNAであって、前記C型肝炎ウイルスのRNAが、C型肝炎ウイルスのポリプロテインのアミノ酸配列における第1804番のロイシン及び第1966番のリジンを含むNS4Bタンパク質をコードするRNAを含むことを特徴とする、HCV/GBV-BキメラRNA。
- (A)C型肝炎ウイルスの、5’非翻訳領域のRNAを含むHCV-5’側RNA、
(B)GBウイルス-Bの、E1タンパク質及びE2タンパク質をコードするRNAを含むGBV-B-RNA、並びに
(C)C型肝炎ウイルスの、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含むHCV-3’側RNA、
を含み、前記HCV-5’側RNA(A)及びHCV-3’側RNA(C)の間に、GBV-B-RNA(B)が挿入される、請求項1に記載のHCV/GBV-BキメラRNA。 - 前記HCV-5’側RNA(A)が、5’非翻訳領域のRNA及びコアタンパク質の一部又は全部をコードするRNAを含み、
前記GBV-B-RNA(B)が、コアタンパク質の一部、E1タンパク質、E2タンパク質、及びp6タンパク質をコードするRNAを含み、
前記HCV-3’側RNA(C)が、p7タンパク質、NS2タンパク質、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含む、
請求項2に記載のHCV/GBV-BキメラRNA。 - 前記HCV-5’側RNA(A)及び前記HCV-3’側RNA(C)が、それぞれ、配列番号57で示される塩基配列の相当する領域の塩基配列、又は該塩基配列と95%以上の相同性を有する塩基配列を有し、霊長類の肝臓細胞内で増殖可能なウイルス粒子をコードする請求項1~3のいずれか1項に記載のHCV/GBV-BキメラRNA。
- 前記GBV-B-RNA(B)が、コアタンパク質の全部、E1タンパク質、E2タンパク質、及びp6タンパク質をコードするRNAを含み、
前記HCV-3’側RNA(C)が、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含む、
請求項2に記載のHCV/GBV-BキメラRNA。 - (A)C型肝炎ウイルスの、5’非翻訳領域のRNA並びにコアタンパク質及びE1タンパク質の一部をコードするRNAを含むHCV-5’側RNA、
(B)GBウイルス-Bの、E1タンパク質の一部及びE2タンパク質をコードするRNAを含むGBV-B-RNA、並びに
(C)C型肝炎ウイルスの、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含むHCV-3’側RNA、
を含み、前記HCV-5’側RNA(A)及びHCV-3’側RNA(C)の間に、GBV-B-RNA(B)が挿入され、前記HCV-5’側RNA(A)によりコードされるE1タンパク質の一部は、E1タンパク質のN末端側の一部分であり、前記GBV-B-RNA(B)によりコードされるE1タンパク質の一部は、E1タンパク質のC末端側の一部分であり、これらの両方の部分の融合によりE1タンパク質の全長がカバーされる、請求項1に記載のHCV/GBV-BキメラRNA。 - 前記HCV-5’側RNA(A)によりコードされるE1タンパク質の一部は、E1タンパク質のN末端から30アミノ酸以下の領域である請求項4記載のHCV/GBV-BキメラRNA。
- 前記HCV-3’側RNA(C)が、p7タンパク質、NS2タンパク質、NS3タンパク質、NS4Aタンパク質、NS4Bタンパク質、NS5Aタンパク質及びNS5Bタンパク質をコードするRNA、並びに3’非翻訳領域のRNAを含む、請求項5又は6記載のHCV/GBV-BキメラRNA。
- 前記HCV-5’側RNA(A)及び前記HCV-3’側RNA(C)が、それぞれ、配列番号57で示される塩基配列の相当する領域の塩基配列、又は該塩基配列と95%以上の相同性を有する塩基配列を有し、前記GBV-B-RNA(B)が、配列番号99で示される塩基配列の相当する領域の塩基配列、又は該塩基配列と95%以上の相同性を有する塩基配列を有し、霊長類の肝臓細胞内で増殖可能なウイルス粒子をコードする請求項5~8のいずれか1項に記載のHCV/GBV-BキメラRNA。
- 配列番号55で表される塩基配列からなるRNAである、請求項3記載のHCV/GBV-BキメラRNA。
- 配列番号93、95若しくは97で表される塩基配列、又はこれらの塩基配列と95%以上の相同性を有する塩基配列を含み、霊長類の肝臓細胞内で増殖可能なウイルス粒子をコードする請求項1記載のHCV/GBV-BキメラRNA。
- 配列番号93、95又は97で表される塩基配列からなるRNAである、請求項11記載のHCV/GBV-BキメラRNA。
- 請求項1~12のいずれか一項に記載のHCV/GBV-BキメラRNAの相補的なHCV/GBV-Bマイナス鎖キメラRNA。
- 請求項1~12のいずれか一項に記載のHCV/GBV-BキメラRNAを含むHCV/GBV-Bキメラウイルス。
- 請求項1~12のいずれか一項に記載のHCV/GBV-BキメラRNAをコードする、HCV/GBV-BキメラDNA。
- 請求項15に記載のDNAを含むベクター。
- 請求項1~12のいずれか一項に記載のRNA又は請求項12に記載のDNAから翻訳されるHCV/GBV-Bキメラタンパク質。
- 請求項1~12のいずれか一項に記載のHCV/GBV-BキメラRNAを含む、HCV/GBV-BキメラRNA複製細胞。
- 請求項1~12のいずれか一項に記載のHCV/GBV-BキメラRNA、又は請求項11に記載のHCV/GBV-Bキメラウイルスを接種された非ヒト動物。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP09797935A EP2322609A4 (en) | 2008-07-15 | 2009-07-15 | CHIMERIC HCV / GBV B VIRUS |
| JP2010520878A JP5693957B2 (ja) | 2008-07-15 | 2009-07-15 | Hcv/gbv−bキメラウイルス |
| US13/054,356 US8741607B2 (en) | 2008-07-15 | 2009-07-15 | HCV/GBV-B chimeric virus |
| AU2009273061A AU2009273061B2 (en) | 2008-07-15 | 2009-07-15 | HCV/GBV-B chimeric virus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008184179 | 2008-07-15 | ||
| JP2008-184179 | 2008-07-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010008010A1 true WO2010008010A1 (ja) | 2010-01-21 |
Family
ID=41550412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2009/062786 Ceased WO2010008010A1 (ja) | 2008-07-15 | 2009-07-15 | Hcv/gbv-bキメラウイルス |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8741607B2 (ja) |
| EP (1) | EP2322609A4 (ja) |
| JP (1) | JP5693957B2 (ja) |
| AU (1) | AU2009273061B2 (ja) |
| WO (1) | WO2010008010A1 (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154226A (zh) * | 2011-01-10 | 2011-08-17 | 南方医科大学 | 一种丙型肝炎病毒完整囊膜蛋白与gb病毒b的嵌合病毒 |
| CN102154227A (zh) * | 2011-01-10 | 2011-08-17 | 南方医科大学 | 一种丙型肝炎病毒完整结构蛋白与gb病毒b的嵌合病毒 |
| CN102268412A (zh) * | 2011-01-10 | 2011-12-07 | 南方医科大学 | 一种丙型肝炎病毒的非结构蛋白与gb病毒b的嵌合病毒 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016061210A2 (en) * | 2014-10-14 | 2016-04-21 | The Trustees Of Columbia University In The City Of New York | Novel viruses found in rattus norvegicus and uses thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08187097A (ja) | 1994-12-28 | 1996-07-23 | Tonen Corp | Rnaウィルスのプラス鎖又はマイナス鎖遺伝子の特異的検出方法 |
| WO2004005498A1 (en) * | 2002-07-03 | 2004-01-15 | Board Of Regents, The University Of Texas System | Chimeric gb virus b (gbv-b) |
| JP2005528885A (ja) * | 2002-01-15 | 2005-09-29 | イステイチユート・デイ・リチエルケ・デイ・ビオロジア・モレコラーレ・ピ・アンジエレツテイ・エツセ・ピー・アー | Gbウイルスbレプリコン及びレプリコン強化細胞 |
| WO2006036879A2 (en) * | 2004-09-27 | 2006-04-06 | Board Of Regents, The University Of Texas System | Chimeric gb virus b (gbv-b) |
| WO2008136470A1 (ja) | 2007-04-27 | 2008-11-13 | Advanced Life Science Institute, Inc. | Hcv遺伝子 |
-
2009
- 2009-07-15 EP EP09797935A patent/EP2322609A4/en not_active Withdrawn
- 2009-07-15 AU AU2009273061A patent/AU2009273061B2/en not_active Ceased
- 2009-07-15 WO PCT/JP2009/062786 patent/WO2010008010A1/ja not_active Ceased
- 2009-07-15 US US13/054,356 patent/US8741607B2/en not_active Expired - Fee Related
- 2009-07-15 JP JP2010520878A patent/JP5693957B2/ja not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08187097A (ja) | 1994-12-28 | 1996-07-23 | Tonen Corp | Rnaウィルスのプラス鎖又はマイナス鎖遺伝子の特異的検出方法 |
| JP2005528885A (ja) * | 2002-01-15 | 2005-09-29 | イステイチユート・デイ・リチエルケ・デイ・ビオロジア・モレコラーレ・ピ・アンジエレツテイ・エツセ・ピー・アー | Gbウイルスbレプリコン及びレプリコン強化細胞 |
| WO2004005498A1 (en) * | 2002-07-03 | 2004-01-15 | Board Of Regents, The University Of Texas System | Chimeric gb virus b (gbv-b) |
| WO2006036879A2 (en) * | 2004-09-27 | 2006-04-06 | Board Of Regents, The University Of Texas System | Chimeric gb virus b (gbv-b) |
| WO2008136470A1 (ja) | 2007-04-27 | 2008-11-13 | Advanced Life Science Institute, Inc. | Hcv遺伝子 |
Non-Patent Citations (11)
| Title |
|---|
| HAQSHENAS G. ET AL.: "A chimeric GB virus B encoding the hepatitis C virus hypervariable region 1 is infectious in vivo", J. GEN. VIROL., vol. 88, 2007, pages 895 - 902, XP008135568 * |
| HEPATOLOGY, vol. 41, 2005, pages 986 - 994 |
| JOURNAL OF GENERAL VIROLOGY, vol. 88, 2007, pages 895 - 902 |
| JOURNAL OF VIROLOGY, vol. 69, 1995, pages 5621 - 5630 |
| LEMM J. A. ET AL.: "Replication-competent chimeric hepatitis C virus subgenomic replicons", INTERVIROLOGY, vol. 48, 2005, pages 183 - 91, XP008123185 * |
| LINDSTROM H. ET AL.: "Mutations of the Hepatitis C virus protein NS4B on either side of the ER membrane affect the efficiency of subgenomic replicons", VIRUS RES., vol. 121, 2006, pages 169 - 78, XP024957170 * |
| LOHMANN ET AL., SCIENCE, vol. 285, 1999, pages 10 - 113 |
| LOHMANN V. ET AL.: "Viral and cellular determinants of hepatitis C virus RNA replication in cell culture", J. VIROL., vol. 77, 2003, pages 3007 - 19, XP002556990 * |
| RIJNBRAND R. ET AL.: "A chimeric GB virus B with 5' nontranslated RNA sequence from hepatitis C virus causes hepatitis in tamarins", HEPATOLOGY, vol. 41, 2005, pages 986 - 94, XP008135569 * |
| See also references of EP2322609A4 |
| VIROLOGY, vol. 262, 1999, pages 470 - 478 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154226A (zh) * | 2011-01-10 | 2011-08-17 | 南方医科大学 | 一种丙型肝炎病毒完整囊膜蛋白与gb病毒b的嵌合病毒 |
| CN102154227A (zh) * | 2011-01-10 | 2011-08-17 | 南方医科大学 | 一种丙型肝炎病毒完整结构蛋白与gb病毒b的嵌合病毒 |
| CN102268412A (zh) * | 2011-01-10 | 2011-12-07 | 南方医科大学 | 一种丙型肝炎病毒的非结构蛋白与gb病毒b的嵌合病毒 |
| CN102154226B (zh) * | 2011-01-10 | 2012-10-17 | 南方医科大学 | 一种丙型肝炎病毒完整囊膜蛋白与gb病毒b的嵌合病毒 |
Also Published As
| Publication number | Publication date |
|---|---|
| US8741607B2 (en) | 2014-06-03 |
| JPWO2010008010A1 (ja) | 2012-01-05 |
| AU2009273061A1 (en) | 2010-01-21 |
| JP5693957B2 (ja) | 2015-04-01 |
| US20110289610A1 (en) | 2011-11-24 |
| EP2322609A4 (en) | 2013-01-30 |
| EP2322609A1 (en) | 2011-05-18 |
| AU2009273061B2 (en) | 2015-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2005275713B2 (en) | Modified human hepatitis C virus genomic RNA having autonomous replicative competence | |
| JP4694208B2 (ja) | 遺伝子型2aのC型肝炎ウイルス(HCV)ゲノム由来の核酸を含む核酸構築物、及び該核酸構築物を導入した細胞 | |
| JP2013198486A (ja) | Hcv遺伝子 | |
| JP5693957B2 (ja) | Hcv/gbv−bキメラウイルス | |
| CN1882690B (zh) | 从新hcv株衍生的核酸和基因以及使用所述基因的复制子-复制细胞 | |
| AU2011313158B2 (en) | Hepatitis C virus gene | |
| KR100894150B1 (ko) | 신규한 배열을 가진 hcv rna | |
| WO2011024875A1 (ja) | C型肝炎ウイルスの新規株由来のポリヌクレオチド及びその利用 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09797935 Country of ref document: EP Kind code of ref document: A1 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2010520878 Country of ref document: JP |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| REEP | Request for entry into the european phase |
Ref document number: 2009797935 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2009797935 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2009273061 Country of ref document: AU |
|
| ENP | Entry into the national phase |
Ref document number: 2009273061 Country of ref document: AU Date of ref document: 20090715 Kind code of ref document: A |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 13054356 Country of ref document: US |