WO2024069937A1 - 核酸増幅用反応槽、カートリッジ及び核酸増幅方法 - Google Patents
核酸増幅用反応槽、カートリッジ及び核酸増幅方法 Download PDFInfo
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- WO2024069937A1 WO2024069937A1 PCT/JP2022/036722 JP2022036722W WO2024069937A1 WO 2024069937 A1 WO2024069937 A1 WO 2024069937A1 JP 2022036722 W JP2022036722 W JP 2022036722W WO 2024069937 A1 WO2024069937 A1 WO 2024069937A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
- B01L3/502746—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by the means for controlling flow resistance, e.g. flow controllers, baffles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
- B01L2200/0605—Metering of fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/06—Fluid handling related problems
- B01L2200/0684—Venting, avoiding backpressure, avoid gas bubbles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0861—Configuration of multiple channels and/or chambers in a single devices
- B01L2300/0864—Configuration of multiple channels and/or chambers in a single devices comprising only one inlet and multiple receiving wells, e.g. for separation, splitting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/16—Surface properties and coatings
- B01L2300/161—Control and use of surface tension forces, e.g. hydrophobic, hydrophilic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
- B01L2400/0487—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure fluid pressure, pneumatics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/04—Moving fluids with specific forces or mechanical means
- B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
- B01L2400/0487—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure fluid pressure, pneumatics
- B01L2400/049—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure fluid pressure, pneumatics vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2400/00—Moving or stopping fluids
- B01L2400/08—Regulating or influencing the flow resistance
- B01L2400/084—Passive control of flow resistance
- B01L2400/086—Passive control of flow resistance using baffles or other fixed flow obstructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
- B01L7/52—Heating or cooling apparatus; Heat insulating devices with provision for submitting samples to a predetermined sequence of different temperatures, e.g. for treating nucleic acid samples
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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
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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
- C12Q1/70—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving virus or bacteriophage
- C12Q1/701—Specific hybridization probes
Definitions
- the present invention relates to a reaction chamber for nucleic acid amplification, a cartridge, and a method for amplifying nucleic acid.
- Patent Document 1 discloses a small, portable amplification and detection device that makes it easier to amplify and detect nucleic acids.
- Patent Document 1 International Publication No. WO 2018/123837, the entire disclosure of which is expressly incorporated herein by reference.
- Patent Document 1 The device described in Patent Document 1 is a device that collects nucleic acid separately from a specimen, and then amplifies and detects the collected nucleic acid.
- this method requires that nucleic acid be collected separately from the specimen, and it is not possible to detect viruses from the specimen all at once.
- the inventors have come up with a plan to use the sample as is without pretreatment, and to recover nucleic acid from the sample, amplify the recovered nucleic acid, and detect the amplified nucleic acid in a single device.
- This device is designed to automatically carry out the above steps sequentially in chambers connected by microchannels, but they have discovered that false positives occur due to the nucleic acid amplification reaction chamber that amplifies the recovered nucleic acid.
- the problem to be solved by the present invention is to provide a nucleic acid amplification reaction vessel capable of suppressing the occurrence of false positives, a nucleic acid amplification cartridge containing the same, and a nucleic acid amplification method using this cartridge, and the present invention aims to provide a nucleic acid amplification reaction vessel capable of suppressing the occurrence of false positives, a nucleic acid amplification cartridge containing the same, and a nucleic acid amplification method using this cartridge.
- reaction liquid in a method in which the reaction liquid is supplied to the reaction liquid supply space from the reaction liquid supply port of the reaction vessel by sucking it to the outside from the exhaust port, bubbles are generated when the reaction liquid is supplied, and if bubbles remain, the reaction liquid may not be positioned at the specified position, and nucleic acid amplification and detection in this situation may cause false positives.
- This tendency is particularly noticeable when the reaction liquid volume is, for example, 10 to 500 ⁇ L or 10 to 100 ⁇ L.
- Figure 4 shows a situation in which reaction liquid RS is retained on the wall of a vertically elongated reaction tank 50 having an exhaust port 51 at the top and a reaction liquid supply port 52 near the bottom, and the reaction liquid RS cannot be stored in the reaction liquid storage space at the bottom in the longitudinal direction.
- the reaction liquid is transferred inside this reaction tank 50 by creating negative pressure inside the tank through suction from the exhaust port 51, and sucking the reaction liquid in a separate chamber out to the supply port near the bottom.
- the reaction liquid may adhere to the wall of the reaction tank and become foamy, as shown in Figure 4.
- the reaction tank in order to eliminate the foamy reaction liquid adhering to the wall surface inside the reaction tank and to store the reaction liquid at a specified position inside the reaction tank, the reaction tank has a reaction liquid supply port and an exhaust port in the reaction liquid supply space, and the reaction liquid supply port is located below the exhaust port in the longitudinal direction of the reaction tank. By positioning the reaction liquid supply port below the exhaust port, the reaction liquid supplied from the reaction liquid supply port flows downward, and bubbles tend to escape upward.
- a protrusion is provided facing inward on at least a part of the boundary between the upper and lower parts of the reaction tank. Bubbles tend to disappear at the tip of the protrusion, and as a result, the liquid tends to collect at the bottom.
- reaction liquid supply port below the exhaust port and above the protrusion, rather than near the bottom, bubble generation can be more effectively suppressed and the reaction liquid is more likely to be stored in the space below the protrusion, thereby more effectively suppressing the occurrence of false positives due to the reaction liquid not being in the designated position.
- the present invention is as follows.
- a reaction tank having a vertically elongated shape, the lower part in the longitudinal direction being a space for containing a reaction liquid, and the upper part being a space for supplying a reaction liquid, the space for supplying a reaction liquid having a reaction liquid supply port and an exhaust port,
- a reaction tank for nucleic acid amplification, the reaction solution supply port being located below the exhaust port in the longitudinal direction.
- the reaction vessel according to [1] which is used in a method in which a reaction liquid is supplied from a reaction liquid supply port to a reaction liquid supply space by suctioning the reaction liquid from an exhaust port to the outside.
- a reaction vessel for nucleic acid amplification having a vertically elongated shape, a lower portion in the longitudinal direction being a space for containing a reaction liquid, and an upper portion being a space for supplying a reaction liquid, and having a protrusion toward the inside of the reaction vessel in at least a portion near the boundary between the space for supplying a reaction liquid and the space for containing a reaction liquid.
- the reaction vessel according to [1] or [2] which has a protrusion toward the inside of the reaction vessel in at least a part near the boundary between the reaction liquid supply space and the reaction liquid storage space.
- reaction vessel according to any one of [1] to [8], wherein the reaction liquid accommodation space has a volume in the range of 10 to 500 ⁇ L.
- the reaction tank according to any one of items [4] to [9], wherein a ratio L1:L2:L3 of a distance L1 between the exhaust port and the reaction liquid supply port, a distance L2 between the protrusion and the reaction liquid supply port, and a distance L3 between the protrusion and a bottom of the reaction liquid accommodating space can be in a range of, for example, 1:0.1 to 1:0.1 to 1, and when L1+L2+L3 is 1, L2+L3 is in a range of, for example, 0.3 to 0.7.
- the surface roughness Ra of at least a part or all of the inner surface of the reaction vessel is 25 nm or less.
- a cartridge (10) for nucleic acid amplification comprising one or more nucleic acid amplification reaction chambers (20) connected to the chambers via microchannels (30 and 31), A cartridge, wherein the reaction vessel (20) is the reaction vessel according to any one of [1] to [14].
- a nucleic acid amplification method using the cartridge according to [15] A reaction solution containing the nucleic acid to be amplified is supplied to the reaction solution supply space from the reaction solution supply port by creating a negative pressure in the reaction tank through suction from the exhaust port;
- a method for amplifying nucleic acid comprising: subjecting a reaction solution which has spontaneously migrated from a reaction solution supply space to a reaction solution storage space to a nucleic acid amplification reaction.
- the present invention makes it possible to suppress the occurrence of false positives in detection after nucleic acid amplification.
- FIG. 1 is a schematic diagram illustrating a portion of a cartridge of the present invention having a reaction vessel as an example.
- FIG. 2 is a schematic diagram of a reaction vessel according to an embodiment of the present invention.
- FIG. 3-1 is a schematic diagram of a reaction vessel according to an embodiment of the present invention.
- FIG. 3-2 is a schematic diagram of a reaction vessel according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram of a reaction vessel other than that of the present invention.
- FIG. 5 is a schematic diagram of a reaction vessel according to an embodiment of the present invention.
- the first aspect of the present invention relates to a reaction vessel for nucleic acid amplification, which is a vertically elongated reaction vessel, the lower part in the longitudinal direction being a space for containing a reaction liquid and the upper part being a space for supplying a reaction liquid, the reaction liquid supply space having a reaction liquid supply port and an exhaust port, and the reaction liquid supply port being located below the exhaust port in the longitudinal direction.
- the second aspect of the present invention relates to a reaction vessel for nucleic acid amplification that is an elongated reaction vessel, the lower part in the longitudinal direction is a space for containing a reaction liquid, the upper part is a space for supplying a reaction liquid, and at least a part near the boundary between the space for supplying a reaction liquid and the space for containing a reaction liquid has a protrusion toward the inside of the reaction vessel.
- the preferred nucleic acid amplification reaction vessel of the present invention is a reaction vessel having a vertical shape, which is a common part between the first and second embodiments, the lower part in the longitudinal direction being a space for containing reaction liquid, the upper part being a space for supplying reaction liquid, the reaction liquid supply space having a reaction liquid supply port and an exhaust port, the reaction liquid supply port being located below the exhaust port in the longitudinal direction, and the reaction liquid amplification reaction vessel having a protrusion toward the inside of the reaction vessel in at least a part near the boundary between the reaction liquid supply space and the reaction liquid containing space.
- FIGS. 1 and 2 are schematic diagrams illustrating an example of a nucleic acid amplification reaction vessel of the present invention.
- the nucleic acid amplification reaction vessel of the present invention will be described with reference to FIGS. 1 and 2.
- the nucleic acid amplification reaction tank 20 of the present invention is a vertically elongated reaction tank, with the lower part in the longitudinal direction being the reaction liquid storage space 21 and the upper part being the reaction liquid supply space 22.
- the reaction liquid supply space 22 has a reaction liquid supply port 32 and an exhaust port 24. At least a part near the boundary between the reaction liquid supply space 22 and the reaction liquid storage space 21 has a protrusion 25 facing the inside of the reaction tank.
- a in FIG. 2 shows a cross section on the same plane as FIG. 1, and B shows a cross section of the reaction tank 20 when rotated 90° about the vertical axis (longitudinal axis).
- the space up to the protrusion 25 of the reaction liquid supply space 22 is a rectangular parallelepiped.
- the reaction liquid supply space 22 can also be cylindrical, and the protrusion 25 can also be circular with a circular opening in the center.
- the reaction liquid supply space 22 may have a columnar part 23 extending from the side wall inside the reaction tank 20 near the reaction liquid supply port 32 or the protrusion 25.
- the reaction liquid storage space is a space for storing the reaction liquid and amplifying the nucleic acid contained in the reaction liquid, and there is no particular limit to its volume, but from the viewpoint of being able to amplify and detect with high sensitivity the nucleic acid in a small amount of sample, it is, for example, in the range of 10 to 500 ⁇ L, and preferably in the range of 10 to 100 ⁇ L. However, it is not intended to be limited to this numerical range.
- the protrusion 25 near the boundary between the reaction liquid supply space 22 and the reaction liquid storage space 21 is present on part or all of the boundary, and it is preferable that it is present on the entire boundary.
- the presence of the protrusion 25 makes it easier to eliminate bubbles that occur when the reaction liquid is supplied, making it easier to store the reaction liquid in the reaction liquid storage space 21.
- the opening 26 formed by the protrusion 25 serves as an entrance through which the reaction liquid supplied to the reaction liquid supply space 22 moves to the reaction liquid storage space 21, and has the function of determining the area where the liquid surface of the reaction liquid after moving to the reaction liquid storage space 21 comes into contact with the air in the reaction liquid supply space 22.
- the amount of reaction liquid By setting the amount of reaction liquid to an amount at which the liquid surface of the reaction liquid is positioned at approximately the same height as the opening 26, the liquid surface of the reaction liquid becomes approximately equal to the area of the opening 26 and is smaller than when the protrusion 25 is not present, making it easier for the reaction liquid to stay in the reaction liquid storage space 21. As shown in FIG. 3-1, when the protrusions 25 are present, the reaction liquid is more likely to remain in the reaction liquid storage space 21 so that the surface area is minimized by interfacial tension.
- the ratio of the horizontal cross section at the position where the protrusion is located i.e., the area of the opening 26, is preferably in the range of 30 to 95, more preferably in the range of 60 to 80.
- the area of the opening 26 in the horizontal cross section at the position where the protrusion 25 is located may be in the range of, for example, 1 to 10 mm2, depending on the horizontal cross-sectional area of the reaction vessel.
- the horizontal cross-sectional area of the reaction vessel may be in the range of, for example, 2 to 20 mm2. However, it is not intended to be limited to these numerical ranges.
- the reaction liquid supply port 32 is located below the exhaust port 24 and above the protrusion 25 from the viewpoint that the reaction liquid is easily stored as a lump in the reaction liquid storage space 21.
- the exhaust port 24 is located near the top, so that the reaction liquid supplied from the reaction liquid supply port 32 tends to remain in a space other than the reaction liquid storage space 21 as shown in FIG. 5, and it tends to be difficult to store the reaction liquid as a lump in the reaction liquid storage space 21. As shown in FIG.
- the ratio L1:L2:L3 of the distance L1 between the exhaust port 24 and the reaction liquid supply port 32, the distance L2 between the protrusion 25 and the reaction liquid supply port 32, and the distance L3 between the protrusion 25 and the bottom of the reaction liquid storage space 21 can be, for example, in the range of 1:0.1 to 1:0.1 to 1, and can be in the range of 1:0.3 to 0.8:0.3 to 0.8.
- L1+L2+L3 is 1, L2+L3 can be in the range of 0.3 to 0.7, for example. However, it is not intended to be limited to these numerical ranges.
- the side wall of the reaction liquid storage space is optically transparent.
- the horizontal cross-sectional area of the reaction liquid storage space e.g., the maximum cross-sectional area
- the horizontal cross-sectional area of the reaction liquid storage space can be smaller than the horizontal cross-sectional area of the reaction liquid supply space.
- the surface roughness Ra of at least a part or all of the inner surface of the reaction liquid storage space 21 is 25 nm or less. From the viewpoint of further suppressing the occurrence of false positives, it is even more preferable that the surface roughness Ra of at least a part or all of the inner surface of the reaction liquid supply space 22 is 25 nm or less. However, it is not intended to be limited to this numerical range.
- At least a part or all of the inner surface of the reaction liquid storage space 21 is wax-coated in order to control the surface roughness and further suppress the occurrence of false positives. It is also preferable that at least a part or all of the inner surface of the reaction liquid supply space 22 is wax-coated in order to further suppress the occurrence of false positives.
- the present invention relates to a cartridge 10 for nucleic acid amplification, which has chambers connected by microchannels and includes one or more reaction chambers 20 for nucleic acid amplification connected to the chambers via microchannels 30 and 31, wherein the reaction chambers 20 are the reaction chambers of the present invention.
- FIG. 1 shows an example of a cartridge having four reaction vessels 20.
- the microchannel 30 from the upstream chamber branches into two along the way to form microchannels 31, which further branch into two to form a total of four channels, and these channels are connected to the reaction liquid supply ports 32 of each reaction vessel.
- the supply of reaction liquid to the reaction vessel 20 through the microchannels 30 and 31 is performed by applying negative pressure to the reaction liquid supply space 22 from the exhaust port 24 located in the reaction liquid supply space 22. Negative pressure can be applied by connecting, for example, a vacuum pump to the exhaust port 24.
- the vacuum pump can be provided separately from the cartridge.
- the reaction liquid can be stored in a predetermined position in each of the reaction tanks.
- the reaction liquid can be stored in a predetermined position in each of the reaction tanks.
- the present invention encompasses a method for amplifying nucleic acid using the cartridge of the present invention, which comprises: (1) creating a negative pressure in the reaction tank by suctioning from an exhaust port, thereby supplying a reaction solution containing nucleic acid to be amplified from a reaction solution supply port to a reaction solution supply space, and (2) subjecting the reaction solution that spontaneously moves from the reaction solution supply space to a reaction solution storage space to a nucleic acid amplification reaction.
- step (1) the reaction liquid containing the nucleic acid to be amplified is supplied to the reaction liquid supply space from the reaction liquid supply port.
- the reaction liquid is supplied by creating a negative pressure in the reaction tank by sucking air from the exhaust port.
- the reaction liquid is supplied to the reaction liquid supply space from the reaction liquid supply port 32, which is located below the exhaust port 24 and above the protrusion 25, thereby preventing bubbles from forming in the reaction liquid and further reducing the occurrence of false positives in detection after nucleic acid amplification.
- the amount of reaction liquid supplied to the reaction liquid supply space is set to a volume equivalent to the volume of the reaction liquid storage space. This makes it easier for the reaction liquid to be stored as a single mass in the reaction liquid storage space due to the action of the protrusion, and further reduces the occurrence of false positives in detection after nucleic acid amplification.
- step (2) the reaction liquid that spontaneously migrates from the reaction liquid supply space to the reaction liquid storage space is subjected to a nucleic acid amplification reaction.
- the reaction liquid contains the nucleic acid to be amplified, and in addition, a nucleic acid amplification enzyme and a nucleic acid amplification primer or probe.
- the enzyme and primer or probe can be added to the reaction liquid before it is supplied to the reaction tank, but they can also be added inside the reaction tank. Addition inside the reaction tank can be performed by placing water-soluble beads containing a nucleic acid amplification enzyme and water-soluble beads containing a nucleic acid amplification primer or probe between the reaction liquid supply port and the protrusion of the reaction liquid supply space.
- the nucleic acid to be amplified in the reaction solution is not particularly limited and can be appropriately selected depending on the intended use of the cartridge of the present invention.
- the nucleic acid to be amplified is not particularly limited, and can be, for example, RNA or DNA.
- the nucleic acid amplification reaction can be an isothermal amplification reaction or a thermocycling amplification reaction of nucleic acid.
- the isothermal amplification reaction can be, for example, the LAMP method or the SmartAmp method.
- the thermocycling amplification reaction can be a PCR amplification reaction.
- the nucleic acid amplification enzyme is not particularly limited, but may be, for example, an enzyme for isothermal amplification reaction of nucleic acid or an enzyme for thermocycle amplification reaction.
- the isothermal amplification reaction of nucleic acid may be, for example, the LAMP method or the SmartAmp method of nucleic acid, and may be an enzyme for amplification reaction of nucleic acid using a strand displacement reaction.
- the polymerase which is an enzyme for nucleic acid amplification reactions having strand displacement activity, can be any known enzyme.
- the polymerase described in WO 2004/040019 can be mentioned, but is not intended to be limited thereto.
- the polymerase having strand displacement activity can also be DNA polymerase (Aac), which is disclosed in WO 2009/054510 (Japanese Patent No. 4450867).
- any of those that are normal, mesophilic, or thermostable can be suitably used.
- this polymerase may be either a natural form or a mutant with an artificial mutation.
- Such a polymerase includes DNA polymerase.
- DNA polymerase includes mutants of DNA polymerase derived from thermophilic Bacillus bacteria such as Bacillus stearothermophilus (hereinafter referred to as "B.st”) and Bacillus caldotenax (hereinafter referred to as "B.ca”) that lack 5' ⁇ 3' exonuclease activity, and Klenow fragment of DNA polymerase I derived from Escherichia coli (E.
- DNA polymerases used in nucleic acid amplification reactions include Vent DNA polymerase, Vent (Exo-) DNA polymerase, DeepVent DNA polymerase, DeepVent (Exo-) DNA polymerase, ⁇ 29 phage DNA polymerase, MS-2 phage DNA polymerase, Z-Taq DNA polymerase, Pfu DNA polymerase, Pfu turbo DNA polymerase, KOD DNA polymerase, 9°Nm DNA polymerase, Therminator DNA polymerase, and Taq DNA polymerase.
- RNA When the nucleic acid to be amplified is RNA, a reverse transcriptase can be used in addition to the DNA polymerase, or a DNA polymerase that also has reverse transcription activity can be used as the DNA polymerase.
- the reverse transcriptase is not particularly limited as long as it has cDNA synthesis activity using RNA as a template, and examples of the reverse transcriptase include reverse transcriptases of various origins, such as avian myeloblastosis virus reverse transcriptase (AMVRTase), Rous-associated virus 2 reverse transcriptase (RAV-2RTase), and Moloney murine leukemia virus reverse transcriptase (MMLVRTase).
- AMVRTase avian myeloblastosis virus reverse transcriptase
- RAV-2RTase Rous-associated virus 2 reverse transcriptase
- MMLVRTase Moloney murine leukemia virus reverse transcriptase
- the primer is appropriately selected depending on the enzyme used for the nucleic acid amplification reaction.
- the enzyme for the nucleic acid amplification reaction is an enzyme for the nucleic acid amplification reaction using a strand displacement reaction
- examples of the primers include those described in International Publication No. 2004/040019, Japanese Patent Application Publication No. 2009-171935, Japanese Patent Application Publication No. 2011-50380, etc.
- the method of the present invention may further include a step of optically detecting, electrically detecting, or detecting by surface plasmon resonance the nucleic acid amplified in the reaction vessel after the nucleic acid amplification operation.
- the amplified nucleic acid may be detected by using a fluorogenic primer as the primer and labeling the fluorogenic primer.
- the amplified nucleic acid may be detected by utilizing the exciton effect by using an exciton primer or an exciton probe in the amplification reaction.
- the method of optically detecting the nucleic acid may be a method using an intercalating dye.
- the nucleic acid amplification reaction it is preferable to carry out the nucleic acid amplification reaction by the SmartAmp method or the LAMP method, and to detect the labeling with an exciton primer or an exciton probe.
- nucleic acid melting curve can be drawn, and the melting curve can be used to determine the properties of the amplified product, such as whether it is a false positive or true positive.
- the present invention is useful in fields related to nucleic acid amplification and detection.
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Abstract
Description
特許文献1の全記載は、ここに特に開示として援用される。
[1]
縦長形状の反応槽であって、長手方向の下部が反応液収容用空間であり、上部が反応液供給用空間であり、反応液供給用空間に反応液供給口及び排気口を有し、
反応液供給口は、前記長手方向の排気口より下方に位置する、核酸増幅用反応槽。
[2]
排気口から外部に吸引することで反応液供給口から反応液供給用空間に反応液が供給される方法で用いるための、[1]に記載の反応槽。
[3]
縦長形状の反応槽であって、長手方向の下部が反応液収容用空間であり、上部が反応液供給用空間であり、反応液供給用空間と反応液収容用空間の境界近傍の少なくとも一部に、反応槽内部に向かう突起部を有する、核酸増幅用反応槽。
[4]
反応液供給用空間と反応液収容用空間の境界近傍の少なくとも一部に、反応槽内部に向かう突起部を有する、[1]または[2]に記載の反応槽。
[5]
突起部は、前記境界の全部に存在する、[3]または[4]に記載の反応槽。
[6]
反応槽の水平断面積を100としたときに、突起部を有する位置の水平断面積の比が30~95の範囲である、[3]~[5]のいずれか1項に記載の反応槽。
[7]
突起部を有する位置の水平断面における開口の面積が1~10mm2の範囲である、[3]~[6]のいずれか1項に記載の反応槽。
[8]
反応槽が反応液供給用空間に排気口を有する場合に、
反応液供給口は、排気口より下方であり、かつ突起部より上方に位置する、[4]~[7]のいずれか1項に記載の反応槽。
[9]
反応液収容用空間は、10~500μLの範囲の容積を有する、[1]~[8]のいずれか1項に記載の反応槽。
[10]
反応槽が反応液供給用空間に排気口を有する場合に、
排気口と反応液供給口との間の距離L1と、突起部と反応液供給口との間の距離L2と、突起部と反応液収容用空間の底部との間の距離L3の比L1:L2:L3は、例えば、1:0.1~1:0.1~1の範囲であることができ、L1+L2+L3を1としたとき、L2+L3は、例えば、0.3~0.7の範囲である、[4]~[9]のいずれか1項に記載の反応槽。
[11]
反応液収容用空間は、側壁の少なくとも一部が光透過性を有する、[1]~[10]のいずれか1項に記載の反応槽。
[12]
反応液収容用空間の水平断面積は、反応液供給用空間の水平断面積より小さい、[1]~[11]のいずれか1項に記載の反応槽。
[13]
反応槽の少なくとも一部または全部の内表面の表面粗さRaが25nm以下である、[1]~[12]のいずれか1項に記載の反応槽。
[14]
反応槽の少なくとも一部または全部の内表面がワックス被覆されている、[1]~[12]のいずれか1項に記載の反応槽。
[15]
マイクロ流路で連絡されたチャンバーを有し、マイクロ流路(30及び31)を介してチャンバーと連絡する1つまたは2つ以上の核酸増幅用反応槽(20)を含む核酸増幅用カートリッジカートリッジ(10)であって、
反応槽(20)が、[1]~[14]のいずれか1項に記載の反応槽である、カートリッジ。
[16]
[15]に記載のカートリッジを用いる核酸増幅方法であって、
排気口から吸引して反応槽内を陰圧にすることで、反応液供給口から増幅されるべき核酸を含有する反応液を反応液供給用空間に供給し、
反応液供給用空間から反応液収容用空間に自発的に移動した反応液を核酸増幅反応に供する、ことを含む核酸増幅方法。
本発明の第一の態様の核酸増幅用反応槽は、縦長形状の反応槽であって、長手方向の下部が反応液収容用空間であり、上部が反応液供給用空間であり、反応液供給用空間に反応液供給口及び排気口を有し、反応液供給口が、長手方向の排気口より下方に位置する、核酸増幅用反応槽に関する。
本発明は、マイクロ流路で連絡されたチャンバーを有し、マイクロ流路30及び31を介して上記チャンバーと連絡する1つまたは2つ以上の核酸増幅用反応槽20を含む核酸増幅用カートリッジ10であって、反応槽20が、上記本発明の反応槽であるカートリッジに関する。
本発明は、上記本発明のカートリッジを用いる核酸増幅方法を包含する。この方法は、(1)排気口から吸引して反応槽内を陰圧にすることで、反応液供給口から増幅されるべき核酸を含有する反応液を反応液供給用空間に供給し、(2)反応液供給用空間から反応液収容用空間に自発的に移動した反応液を核酸増幅反応に供する、ことを含む。
20 反応槽
21 反応液収容用空間
22 反応液供給用空間
23 柱状部
24 排気口
25 突起部
26 開口
30,31 流路
32 反応液供給口
Claims (16)
- 縦長形状の反応槽であって、長手方向の下部が反応液収容用空間であり、上部が反応液供給用空間であり、反応液供給用空間に反応液供給口及び排気口を有し、
前記反応液供給口は、前記長手方向の排気口より下方に位置する、核酸増幅用反応槽。 - 排気口から外部に吸引することで反応液供給口から反応液供給用空間に反応液が供給される方法で用いるための、請求項1に記載の反応槽。
- 縦長形状の反応槽であって、長手方向の下部が反応液収容用空間であり、上部が反応液供給用空間であり、前記反応液供給用空間と反応液収容用空間の境界近傍の少なくとも一部に、反応槽内部に向かう突起部を有する、核酸増幅用反応槽。
- 前記反応液供給用空間と反応液収容用空間の境界近傍の少なくとも一部に、反応槽内部に向かう突起部を有する、請求項1または2に記載の反応槽。
- 前記突起部は、前記境界の全部に存在する、請求項3または4に記載の反応槽。
- 反応槽の水平断面積を100としたときに、突起部を有する位置の水平断面積の比が30~95の範囲である、請求項3~5のいずれか1項に記載の反応槽。
- 突起部を有する位置の水平断面における開口の面積が1~10mm2の範囲である、請求項3~6のいずれか1項に記載の反応槽。
- 前記反応槽が前記反応液供給用空間に排気口を有する場合に、
前記反応液供給口は、前記排気口より下方であり、かつ前記突起部より上方に位置する、請求項4~7のいずれか1項に記載の反応槽。 - 前記反応液収容用空間は、10~500μLの範囲の容積を有する、請求項1~8のいずれか1項に記載の反応槽。
- 前記反応槽が前記反応液供給用空間に排気口を有する場合に、
排気口と反応液供給口との間の距離L1と、突起部と反応液供給口との間の距離L2と、突起部と反応液収容用空間の底部との間の距離L3の比L1:L2:L3は、例えば、1:0.1~1:0.1~1の範囲であることができ、L1+L2+L3を1としたとき、L2+L3は、例えば、0.3~0.7の範囲である、請求項4~9のいずれか1項に記載の反応槽。 - 前記反応液収容用空間は、側壁の少なくとも一部が光透過性を有する、請求項1~10のいずれか1項に記載の反応槽。
- 前記反応液収容用空間の水平断面積は、前記反応液供給用空間の水平断面積より小さい、請求項1~11のいずれか1項に記載の反応槽。
- 前記反応槽の少なくとも一部または全部の内表面の表面粗さRaが25nm以下である、請求項1~12のいずれか1項に記載の反応槽。
- 前記反応槽の少なくとも一部または全部の内表面がワックス被覆されている、請求項1~12のいずれか1項に記載の反応槽。
- マイクロ流路で連絡されたチャンバーを有し、マイクロ流路(30及び31)を介して前記チャンバーと連絡する1つまたは2つ以上の核酸増幅用反応槽(20)を含む核酸増幅用カートリッジ(10)であって、
前記反応槽(20)が、請求項1~14のいずれか1項に記載の反応槽である、前記カートリッジ。 - 請求項15に記載のカートリッジを用いる核酸増幅方法であって、
排気口から吸引して反応槽内を陰圧にすることで、反応液供給口から増幅されるべき核酸を含有する反応液を反応液供給用空間に供給し、
反応液供給用空間から反応液収容用空間に自発的に移動した反応液を核酸増幅反応に供する、ことを含む前記核酸増幅方法。
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| AU2022480872A AU2022480872A1 (en) | 2022-09-30 | 2022-09-30 | Reaction vessel for nucleic acid amplification, cartridge, and nucleic acid amplification method |
| CN202280100653.XA CN120129736A (zh) | 2022-09-30 | 2022-09-30 | 核酸扩增用反应槽、试剂盒及核酸扩增方法 |
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- 2022-09-30 WO PCT/JP2022/036722 patent/WO2024069937A1/ja not_active Ceased
- 2022-09-30 CN CN202280100653.XA patent/CN120129736A/zh active Pending
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