WO2006005235A1 - Comparing method for expression amount of the same gene from different sources by base sequence measurement - Google Patents
Comparing method for expression amount of the same gene from different sources by base sequence measurement Download PDFInfo
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- WO2006005235A1 WO2006005235A1 PCT/CN2004/001333 CN2004001333W WO2006005235A1 WO 2006005235 A1 WO2006005235 A1 WO 2006005235A1 CN 2004001333 W CN2004001333 W CN 2004001333W WO 2006005235 A1 WO2006005235 A1 WO 2006005235A1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6809—Methods for determination or identification of nucleic acids involving differential detection
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6844—Nucleic acid amplification reactions
- C12Q1/6853—Nucleic acid amplification reactions using modified primers or templates
- C12Q1/6855—Ligating adaptors
Definitions
- the present invention relates to a method for quantitatively comparing the relative expression levels of the same gene in tissues or cells of different origins, in particular, a method for using the same gene to compare the expression levels of the same gene in different sources.
- the method of base sequencing simultaneously measures the relative content of each DNA fragment in a mixture of DNA fragments labeled with different base sequences.
- the analytical methods for the difference in expression amount mainly include SAGE method [4], RT-PCR method [5] and microarray method (ie gene chip) [6], but these methods still have some shortcomings, mainly in one comparison.
- SAGE method is quite complicated, the steps are many, difficult to master, and the cost is high, which is difficult to popularize; RT-PCR method
- the measurement requires the use of special instruments, and requires the use of internal standards to determine the complexity of the lock.
- the micro-display method is a high-throughput method. Although the measurement volume is large, several genes can be simultaneously measured on one chip.
- Bioluminescence assay using the nucleotide sequence is a newly developed a new technique [7-8], the method is simple and fast, the instrument is cheap, the measurement cost is low, and it is easy to automate. However, since only 10-30 base sequences can be determined, the method is limited to analysis of gene mutations and gene polymorphisms [9].
- the object of the present invention is to use a technique for determining the relative expression of the same gene in different sources by the technique of base sequence determination, that is, how to determine the relative expression amount of the gene by measuring the sequence of several bases, High sensitivity, good quantitative, inexpensive, easy to operate, and used for clinical diagnosis.
- the technical solution of the present invention is as follows, and the measurement principle thereof is as shown in FIG.
- Base sequence method can be used to label the same gene from different sources.
- the first method is DM adapter labeling, which first extracts total RNA or mRNA from different sources or cells and reverses it.
- the double-stranded cDNA is recorded, and the cDNAs of different origins are cut into DNA fragments of different lengths by restriction endonucleases, and the cDNA enzymatic products of each source are respectively connected with the DNA adapters which can distinguish different sources, so that the sources are
- the 'cDNA' tag is sequenced on a different DNA adapter.
- the DNA adapter consists of two single-stranded DNAs that are not completely complementary. The structure is shown in Figure 2.
- One end contains a sequence 1 complementary to the restriction endonuclease nick, and can be ligated with a double-stranded cDNA enzyme under the action of ligase.
- the fragment is ligated; the other end is a "Y"-shaped structure consisting of a non-complementary base sequence 2 and 3.
- sequence 3 can be designed to be complementary to sequence 2, but the 3' end of sequence 3 must be appropriate. The modification prevents it from undergoing an extension reaction under the action of a polymerase.
- Sequence 2 contains a gene-specific sequence 4 and contains a base sequence 5 that does not vary with the source of the gene between the sequence and the 5' end of the strand.
- Different gene-source-specific DNA adapters can be designed to differ only in the base sequence at sequence 4, while the base species and number that make up the sequence are the same.
- the second method is reverse transcription primer labeling, which first extracts total RNA or mRNA from tissues or cells of different origins, and reverse-transcribes them into cDNAs with different primers, so that the cDNA sequences of each source are labeled. Different DNA fragments.
- the structure of the reverse transcription primer is shown in Figure 3, Sequence 3 at the 3' end consists of multiple thymidine bases; there is a gene-specific sequence 2 between the T-terminus and the 5'-end, and in sequence 2 and the 5' end of the strand. There is a base sequence 3 that does not change with the source of the gene.
- Different gene-derived specific reverse transcription primers can be designed to differ only in the base sequence at sequence 2, and the base species and number of the sequences constituting the segment are the same.
- primer CP does not extend. . Since a pair of common primers CP and GSP are used to amplify the same gene fragment from different sources, and the Tm values of the amplified products are identical (the length and the base type are the same), the proportional amplification of the PCR can be ensured.
- arm 3 will extend under the action of DNA polymerase, creating a template for primer CP annealing, which will not allow equal-proportional PCR amplification of genes from different sources.
- the invention adopts a sequencing method based on PPi measurement to determine the sequence of the amplified products of different sources, and distinguishes the genes of each source according to the types of bases in the sequence, according to the peak intensity. Determine the difference in gene expression levels from different sources.
- Gene expression analysis is an important part of genomics research, and the present invention aims to use sequencing techniques for comparative analysis of gene expression differences.
- its innovation is characterized by the fact that the difference in expression of the same gene in multiple different individuals can be simultaneously measured by one analysis without additional measurement costs. Easy to instrument, no need for lasers, gels, fluorescent labels and electrophoresis.
- the method of the invention has high sensitivity, good quantitative property, low price and convenient operation, and has great application prospects.
- FIG. 1 is a schematic diagram showing the difference in gene expression amount of the present invention.
- 2 is a schematic view showing the configuration of a DNA adapter.
- Figure 3 Schematic diagram of the structure of the reverse transcription primer.
- Fig. 4 is a view showing the results of sequencing when the P53 gene in human brain cancer tissues, normal tissues, and liver cancer tissues is labeled by the DNA adapter method.
- Fig. 1 is a schematic diagram showing the difference in gene expression amount of the present invention.
- 2 is a schematic view showing the configuration of a DNA adapter.
- Figure 3 Schematic diagram of the structure of the reverse transcription primer.
- Fig. 4 is a view showing the results of sequencing when the P53 gene in human brain cancer tissues, normal tissues, and liver cancer tissues is labeled by the DNA adapter method.
- FIG. 5 is a diagram showing the results of sequencing when the P53 gene in human liver cancer cells and human bladder cancer cells was labeled by a reverse transcription primer method.
- DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The above methods are illustrated by specific examples. The main experimental steps are as follows -
- Fragments of a certain length are ligated with a DNA adapter containing a gene-specific sequence, and then cDNA fragments of each source labeled with a DNA adapter are mixed as a template for a PCR amplification reaction.
- a reverse transcription primer labeling method When labeled with a reverse transcription primer labeling method, mRNAs are reverse transcribed into cDNA using reverse transcription primers corresponding to each source, purified and mixed, and used as a template for a PCR amplification reaction.
- the DNA template in (1) was subjected to PCR amplification using a common primer (CP) unrelated to the gene source, and a gene specific primer (GSP). Since the same gene is amplified from multiple sources by the same pair of primers CP and GSP, the relative proportion of the gene in each source remains unchanged during the amplification process, ie, the same ratio is amplified, and It changes as the number of amplifications increases. To separately determine the difference in the expression levels of multiple genes in the above different sources, only the gene-specific primer GSP needs to be changed.
- CP common primer
- GSP gene specific primer
- the sequence of the base is determined by bioluminescence sequencing, that is, dNTP or ddNTP corresponding to the source of the gene is separately added to the solution containing the substrate, and if the added dNTP or ddNTP is complementary to the template, the pyrophosphate is released ( PPi), PPi can be rapidly converted to ATP by the action of enzyme, and ATP reacts with luciferin and luciferase to generate optical signals.
- the base sequence in the obtained results represents different sources of the gene, and the signal intensity represents the amount of gene expression from each source. According to the difference in the amount of gene expression of each individual, the function of the gene and the discovery of functional genes related to the disease can be quickly determined.
- Example 1 Measurement of the difference in the expression level of P53 gene in human normal tissues, brain cancer tissues and liver cancer tissues.
- This example describes the relative expression levels of P53 genes in three different source tissues as determined by DNA adapter labeling. Three different DNA adapters were first designed and ligated to restriction endonuclease-digested cDNA fragments, which were then mixed for PCR amplification.
- Digestion reaction Take 10 l of double-stranded cDNA, add 10 ⁇ l buffer solution 2 ⁇ , Mbo I TaKaRa endonuclease (10 U) 1 ⁇ , sterilized distilled water 7 ⁇ , total 20 ⁇ reaction system, set The reaction was carried out in a 37 ° C water bath for 2 h and then at 70 ° C for 10 min to inactivate the Mbo I enzyme.
- the Mbo endonuclease is characterized by the ability to recognize the 5'-3' GATC sequence in DNA and cleave it to form a sticky end of the 5'-end GATC.
- adp-1 and adp-4 form another DNA adapter 3 and both have a structure with a 5' end protruding four bases GATC .
- DNA adapters 1, 2 and 3 were used to label the P53 gene in human normal tissues, brain cancer tissues and liver cancer tissues, respectively. Take 1 ⁇ l of the enzyme digestion solution, add 2 ⁇ l of each single strand (10 pmol/L) which constitutes the DNA adapter, 2 ⁇ l of 10 times ⁇ 4 DNA ligase buffer, sterilize distilled water 11 ⁇ l, and place at 70 ° C for 10 min. Then, the temperature was lowered to 16 ° C at a rate of 0.2 ° C / s, T4 DNA ligase (4 U / ⁇ ⁇ ) 2 ⁇ was added, and the reaction was carried out for 2 h.
- PCR amplification The above three different sources of the ligation products are mixed in the same reaction tube in a ratio of 1: 1: 1, and the common primers CCP, 5, -ccc cac ttc ttgttc tct cat-3, respectively, are added. (10 pmol/L) 2 ⁇ , specific primer for biotinylated P53 gene
- Base sequence assay compares the relative expression of the same gene in different source tissues.
- the single-stranded DNA sample (microspheres in step 3) was prepared to contain 25 mM Mg 2+ and 5 mM Tris (pH 7.7).
- the solution was added with 5 priiol of the common primer CP, and after heating at 70 ° C for 10 min, it was naturally cooled to room temperature. Take 1 ⁇ 5 ⁇ and add to 100 ⁇ sequence determination In the standard mixture, dNTPs were sequentially added to carry out the sequencing reaction.
- the sequence standard mixture composition is: 0. l MTris-HAc (pH 7.7), 2 mM EDTA, 10 mM Mg(Ac) 2 , 0.1% albumin (BSA), ImM dithiothreitol (DTT), 3 ⁇ 5, - phosphorylated adenosine monophosphate (APS), O.4 mg/ml polyvinylpyrrolidone (PVP), 0.4 mM fluorescein, 200 mU/ml adenosine triphosphate sulfatase, 2 U/ml adenosine diphosphatase (apyrase) , 1 U DNAzyme Klenow without exonuclease activity, and an appropriate amount of luciferase.
- the first base “C” of the sequence shown in the figure is from DNA adapter 2, representing the expression level of P53 gene in brain cancer tissue A1; the second base “G” is from DNA adapter 1, representing the expression level of P53 gene in normal tissues A2; the third base “A” is derived from earning adapter 3, representing the expression level of P53 gene in liver cancer tissue A3, the peak height ratio of these three base sequences Represents the difference in expression of the P53 gene in these three sources.
- the results of the two measurements (Al: A2: A3) are: 28.20: 24.9: 46.9 and 28.1: 22.4: 49.5, average ratio (Al: A2: A3) For: 28.15: 23.65: 48.2.
- Example 2 Measurement of the difference in the expression level of P53 gene in human liver cancer cells and bladder cancer cells.
- the difference in expression of P53 gene in human hepatoma cells and bladder cancer cells was determined by reverse transcription primer labeling method, that is, the primers of different sequences were used to reverse-transcribe mRNAs from different sources to make cDNA markers of various origins. DNA fragments with different sequences. And compared with the results of RT-PCR measurements.
- RNA was extracted from human hepatoma cells and bladder cancer cells according to the method of [Example 1]. After the quality of the electrophoresis assay was completed, the concentration was determined by ultraviolet light, and then the final concentration was adjusted to ⁇ / ⁇ with DEPC-H20. The mRNAs in human hepatoma cells and bladder cancer cells were reverse transcribed into cDNA using reverse transcription primers ⁇ -1 and ⁇ -2, respectively.
- the sequences of the reverse transcription primers P-1 and P-2 are: P-1: 5' - ccc cac ttc ttg ttc tct cat cag ttt ttt ttt tttt-3'; P-2: 5, - ccc cac ttc ttg Ttc tct cat gac ttt ttt ttt tttttttttttttt -3, .
- reaction steps were as follows: primer P1 or P-2 (10 pmol/L) 3 ⁇ and total RNA (1 ⁇ ⁇ / ⁇ 1) 3 ⁇ l, 70 °C lO min, placed on ice, added 5 times concentration One-chain buffer 4 ⁇ l, 0.1 mol/L DTT 2 ⁇ 1, Rnase inhibitor (40 U/ ⁇ ) 1 ⁇ , dNTP mixture (2.5 mmol/L each) 4 ⁇ , DEPC-H20 2 ⁇ 1, 37 At °C for 2 min, SuperscriptTM II RNase H-reverse transcriptase ⁇ was added and chilled on ice at 42 ° C for 1 h at 70 ° C for 10 min. After purification, an equal volume of the mixture was taken as a template for the PCR reaction.
- Base sequence assay compares the relative expression of the same gene in different source tissues.
- the above single-stranded DNA sample is prepared into a solution containing 25 mM Mg 2+ and 5 mM Tris (pH 7.7), and added separately.
- the common primer CP of pmol was naturally cooled to room temperature after heating at 70 ° C for 10 min. Add 1 to 5 ⁇ M to 100 ⁇ of the standard mixture of standard assays, and then add dNTPs in sequence to perform the sequencing reaction.
- the signal intensity obtained when dCTP was added represented the gene expression level derived from human liver cancer cells; when dGTP was added The resulting signal intensity represents the amount of gene expression derived from human bladder cancer cells.
- the sequencing results are shown in Figure 5.
- the first base "C” of the sequence shown in the figure is derived from the inversion.
- Primer P-1 which represents the gene expression level of human hepatoma cells, Al;
- the second base “G” is derived from the reverse transcription primer P-2, which represents the gene expression level A2 of human bladder cancer cells.
- the peak-to-height ratio of these two base sequences represents the difference in the expression levels of the P53 gene in these three sources.
- the results of the two measurements (Al: A2) are: 82.9:17.1, 87.4:12.6, 84.2:15.8, 89.5 : 10.5, the average value is 86:14 two 6.14:1, and the standard deviation is 3.0:3.0.
- the expression levels of P53 gene in hepatoma cells and bladder cancer cells were 126359 copies/ ⁇ and 22093/ ⁇ 1, respectively, and the ratio was 5.72:1.
- the relative average deviation is less than 2 ° /. , indicating that the method of the method of the present invention is relatively accurate.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/571,827 US20080286766A1 (en) | 2004-07-09 | 2004-11-22 | Comparing Method for Expression Amount of the Same Gene from Different Sources by Base Sequence Measurement |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100627512A CN1294279C (zh) | 2004-04-05 | 2004-07-09 | 采用碱基序列测定法比较同一基因在不同来源中的表达量的方法 |
| CN200410062751.2 | 2004-07-09 |
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| WO2006005235A1 true WO2006005235A1 (en) | 2006-01-19 |
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| PCT/CN2004/001333 Ceased WO2006005235A1 (en) | 2004-07-09 | 2004-11-22 | Comparing method for expression amount of the same gene from different sources by base sequence measurement |
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| WO (1) | WO2006005235A1 (zh) |
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| CN110791580A (zh) * | 2018-08-01 | 2020-02-14 | 福建省热带作物科学研究所 | 一种印度野牡丹chs基因表达量的检测方法 |
Citations (8)
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|---|---|---|---|---|
| US5830656A (en) * | 1996-06-28 | 1998-11-03 | The Ohio State Research Foundation | Detecting the expression of the catr1 gene in squamous cell carcinoma |
| JPH11155600A (ja) * | 1997-11-28 | 1999-06-15 | Shiseido Co Ltd | サイトカイン遺伝子の発現を測定するための改良方法 |
| CN1265155A (zh) * | 1997-06-16 | 2000-08-30 | 俄亥俄医学院 | 利用复合竞争性逆转录酶-聚合酶链反应定量测定基因表达的方法 |
| WO2002018616A1 (en) * | 2000-09-01 | 2002-03-07 | Hitachi Chemical Co., Ltd. | Adjusting the efficiency of nucleic acid template amplification by attenuated pcr with template-mimic oligonucleotides |
| CN1362527A (zh) * | 2001-11-19 | 2002-08-07 | 复旦大学 | 一种定量检测趋化因子表达水平的方法 |
| WO2002083922A2 (en) * | 2001-04-11 | 2002-10-24 | The Government Of The United States Of America, As Represented By The Secretary, Department Of Health & Human Services | Modified random primers for probe labeling |
| CN1398988A (zh) * | 2002-08-09 | 2003-02-26 | 周国华 | 基因表达量比较分析法 |
| US20030064373A1 (en) * | 2000-09-25 | 2003-04-03 | Shahzi Iqbal | Preferential display |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040058373A1 (en) * | 2001-01-31 | 2004-03-25 | Winkler Matthew M. | Competitive amplification of fractionated targets from multiple nucleic acid samples |
-
2004
- 2004-11-22 WO PCT/CN2004/001333 patent/WO2006005235A1/zh not_active Ceased
- 2004-11-22 US US11/571,827 patent/US20080286766A1/en not_active Abandoned
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5830656A (en) * | 1996-06-28 | 1998-11-03 | The Ohio State Research Foundation | Detecting the expression of the catr1 gene in squamous cell carcinoma |
| CN1265155A (zh) * | 1997-06-16 | 2000-08-30 | 俄亥俄医学院 | 利用复合竞争性逆转录酶-聚合酶链反应定量测定基因表达的方法 |
| JPH11155600A (ja) * | 1997-11-28 | 1999-06-15 | Shiseido Co Ltd | サイトカイン遺伝子の発現を測定するための改良方法 |
| WO2002018616A1 (en) * | 2000-09-01 | 2002-03-07 | Hitachi Chemical Co., Ltd. | Adjusting the efficiency of nucleic acid template amplification by attenuated pcr with template-mimic oligonucleotides |
| US20030064373A1 (en) * | 2000-09-25 | 2003-04-03 | Shahzi Iqbal | Preferential display |
| WO2002083922A2 (en) * | 2001-04-11 | 2002-10-24 | The Government Of The United States Of America, As Represented By The Secretary, Department Of Health & Human Services | Modified random primers for probe labeling |
| CN1362527A (zh) * | 2001-11-19 | 2002-08-07 | 复旦大学 | 一种定量检测趋化因子表达水平的方法 |
| CN1398988A (zh) * | 2002-08-09 | 2003-02-26 | 周国华 | 基因表达量比较分析法 |
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| Title |
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| XIAOYONG W. ET AL: "Di-allele-specific-amplification with artifically modified primer for I823M mutation detection of Human ABC1 Gene", CHIN.J.MED.GENET., vol. 21, no. 1, February 2004 (2004-02-01), pages 86 - 88 * |
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| US20080286766A1 (en) | 2008-11-20 |
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