WO2009081967A1 - 標的核酸配列の増幅方法およびそれに用いるプローブ - Google Patents
標的核酸配列の増幅方法およびそれに用いるプローブ Download PDFInfo
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- WO2009081967A1 WO2009081967A1 PCT/JP2008/073537 JP2008073537W WO2009081967A1 WO 2009081967 A1 WO2009081967 A1 WO 2009081967A1 JP 2008073537 W JP2008073537 W JP 2008073537W WO 2009081967 A1 WO2009081967 A1 WO 2009081967A1
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- 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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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
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- 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
- C12Q1/6813—Hybridisation assays
- C12Q1/6827—Hybridisation assays for detection of mutation or polymorphism
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- 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
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
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- C12Q2527/00—Reactions demanding special reaction conditions
- C12Q2527/107—Temperature of melting, i.e. Tm
Definitions
- the present invention relates to a method for amplifying a target nucleic acid sequence in the presence of a probe and a probe used therefor.
- the present invention also relates to a method for suppressing amplification inhibition of a target nucleic acid sequence in the presence of a probe, and a method for analyzing a target nucleic acid sequence.
- Tm melting temperature
- the absorbance is about 1.5 times the absorbance at the start of heating (absorbance of only double-stranded nucleic acids), thereby melting. It can be judged that it has been completed. Based on this phenomenon, the melting temperature Tm (° C.) is generally defined as the temperature at which the absorbance reaches 50% of the total increase in absorbance.
- the single nucleotide polymorphism is caused by single base substitution (point mutation) at the detection target site. For this reason, in order to analyze what kind of polymorphism the detection target site is, it is necessary to determine the difference of one base. Therefore, in the above-described Tm analysis, this single base difference is analyzed by a difference in Tm value. This will be specifically described below.
- the polymorphism in the detection target site is referred to as a mutant type and a wild type for convenience.
- the Tm value is higher as the homology of the double-stranded nucleic acid is higher, and lower as the homology is lower. Therefore, for example, when a detection probe (hereinafter referred to as “mutant probe”) that is completely complementary to a target nucleic acid sequence including a mutant detection target site is designed, the mutant probe and the detection target site are mutated.
- a Tm mut value of a double-stranded nucleic acid with a target sequence that is a type is higher than a Tm wild value of a double-stranded nucleic acid with a target sequence in which the mutant probe and the target site to be detected are a wild type; Become.
- polymorphism can be analyzed as follows.
- the Tm mut value and the Tm wild value when the mutant probe is used are determined in advance as evaluation criteria. Subsequently, a double-stranded nucleic acid is formed between the target nucleic acid sequence to be analyzed whose base of the detection target site is unknown and the mutant probe, and the formed double-stranded nucleic acid is subjected to a heat treatment, and the temperature rises. A signal value such as absorbance indicating the dissociation of the double-stranded nucleic acid is measured. Then, a melting curve showing the fluctuation of the signal value accompanying the temperature change is created, and it is confirmed whether a peak exists in any of the previously determined Tm mut value and Tm wild value.
- the detection target site in the target nucleic acid sequence is a mutant polymorph.
- the detection target site in the target nucleic acid sequence is a wild-type polymorphism. It can also be determined whether the polymorphism is homozygous or heterozygous.
- wild-type probe when using a detection probe that is completely complementary to a target nucleic acid sequence including a wild-type detection target site (hereinafter referred to as “wild-type probe”), the wild-type probe and the detection target site are used as evaluation criteria.
- the Tm wild value of a double-stranded nucleic acid with a target sequence that is a wild type and the Tm mut value of a double-stranded nucleic acid with a target sequence whose detection target site is a mutant type are set. , Can be judged in the same way.
- the Tm wild value of a double-stranded nucleic acid between the wild-type probe and a target sequence whose detection target site is wild-type is the target sequence whose mutant type is the wild-type probe and detection target site.
- a higher value than the Tm mut value of the double-stranded nucleic acid is a higher value than the Tm mut value of the double-stranded nucleic acid.
- the target nucleic acid sequence is amplified in the presence of the detection probe, and the reaction solution after the amplification reaction As is, signal values are measured.
- the step of separately adding the detection probe to the reaction solution after the amplification reaction can be omitted, so that simplification is possible.
- a detection probe is added to the reaction solution in advance, for example, the sealed state of the reaction solution can be maintained, so that contamination can be prevented.
- a probe is added to the reaction solution to perform Tm analysis, and an amplification reaction is performed in the presence of the probe, and the reaction solution is used for Tm analysis.
- the latter method has the following problems. That is, even when using a target nucleic acid sequence whose polymorphism is known, i.e., a target nucleic acid sequence whose peak is known in which of Tm wild value and Tm mut value is used, it is difficult to discriminate because the peak is small, Or it is a problem that a peak is not seen.
- an object of the present invention is to provide an amplification method capable of amplifying a target nucleic acid sequence even in the presence of a probe, a method for suppressing amplification inhibition by the probe, a method for analyzing a target nucleic acid sequence, and a probe used therefor To do.
- the amplification method of the present invention is a method of amplifying a target nucleic acid sequence in a template nucleic acid in the presence of a probe, Amplifying the target nucleic acid sequence by an extension reaction from a primer in the presence of a probe capable of hybridizing to the target nucleic acid sequence;
- a probe a probe having a melting temperature of a double-stranded nucleic acid formed from the probe and a complementary strand to the probe is equal to or lower than a reaction temperature of the extension reaction is used.
- the target nucleic acid sequence is also referred to as a target sequence in the present invention.
- the method for suppressing amplification inhibition according to the present invention is a method for suppressing amplification inhibition that suppresses the inhibition of amplification of the target nucleic acid sequence in the amplification of the target nucleic acid sequence in the template nucleic acid in the presence of the probe.
- the amplification method is the amplification method of the present invention.
- the analysis method of the present invention is a method for analyzing a target nucleic acid sequence using a probe capable of hybridizing to the target nucleic acid sequence, and includes the following steps (A) and (B).
- (A) The step of amplifying the target nucleic acid sequence in the template nucleic acid in the presence of the probe by the amplification method of the present invention
- (B) After the step (A), the temperature of the reaction solution in the step (A) is changed.
- the probe of the present invention is a probe for use in the amplification method of the present invention, and when the double-stranded nucleic acid is formed with the probe and a complementary strand to the probe, the double-stranded nucleic acid
- the probe is characterized in that the melting temperature of the probe is not higher than the reaction temperature of the extension reaction.
- the inventors of the present invention conducted intensive studies to elucidate the cause of the above-described problems when performing an amplification reaction in the presence of a probe and performing a Tm analysis using the reaction solution.
- the probe previously added to the reaction solution before the amplification reaction hybridizes to the template nucleic acid during the amplification reaction, for example, by inhibiting primer annealing or extension from the annealed primer.
- amplification will not occur sufficiently despite the presence of the target sequence, and as a result it is difficult to detect the peak. It seems that there is a problem. Therefore, the present inventors have found that the above problem can be avoided by designing a probe whose Tm value and extension reaction temperature satisfy the above relationship. This is due to the following reasons.
- the probe In polymorphism analysis using a probe, the probe is usually designed to specifically hybridize to a target sequence in order to improve analysis accuracy. In order to specifically hybridize the probe in this way, generally, a method of relatively increasing the length of the probe is taken. However, the longer the probe, the higher its Tm value (ie, the Tm value of a double-stranded nucleic acid consisting of a sequence completely complementary to the probe, for example). Is formed, the probe is difficult to dissociate from the template unless the temperature is higher.
- the present inventors have found that the conventional problem that it is difficult to detect a peak is that a probe designed to specifically hybridize to a target nucleic acid for polymorphism Tm analysis after nucleic acid amplification is used for nucleic acid amplification. At that time, it was found that it hybridized with the template nucleic acid and inhibited the primer annealing and the extension reaction from the annealed primer.
- the base sequence of the probe is changed to its Tm value, that is, the complementary strand to the probe (for example, a complete strand)
- the present invention has been conceived by setting the base sequence in which the Tm value of a double-stranded nucleic acid (complementary strand) is equal to or lower than the extension reaction temperature. According to the present invention, even when the target sequence is amplified in the presence of the probe, the probe is difficult to hybridize to the template nucleic acid at the reaction temperature of the extension reaction. For this reason, the nucleic acid amplification of the target sequence is hardly inhibited by the probe.
- the annealing of the primer to the template nucleic acid or the extension reaction from the primer is difficult to inhibit. As a result, the amplification of the target sequence is prevented. Can be sufficiently performed.
- the Tm value of a complementary strand that is completely complementary to the probe and the Tm value of a complementary strand that differs from the probe only by one base are higher in the former, and thus, conventionally, only one base is used. It is considered that target sequences that are completely complementary are more susceptible to the influence of the probe than target sequences that differ.
- the probe of the present invention such a problem can be avoided. For example, as described above, even with a heterozygous template nucleic acid, the same amplification efficiency can be realized.
- the peak in the Tm analysis can be detected. Therefore, according to the present invention, for example, in Tm analysis, the presence or absence of a peak can be determined with higher reliability than in the past. Therefore, the present invention can be said to be a very useful technique particularly in the field of gene analysis.
- the problems given to Tm analysis when nucleic acid amplification is performed in the presence of a probe and the cause thereof are findings obtained by the present inventors for the first time.
- the probe in order to specifically hybridize the probe to the target sequence, the probe may be set to a relatively high Tm value, but the probe gives nucleic acid amplification as in the present invention.
- the present invention is the first to design a probe from the temperature relationship between the Tm value and the extension reaction.
- FIG. 1 is a graph showing the results of Tm analysis in a comparative example.
- FIG. 2 is a graph showing the results of Tm analysis in the example of the present invention.
- FIG. 3 is a graph showing the results of Tm analysis in the example of the present invention.
- the amplification method of the present invention is a method of amplifying a target nucleic acid sequence in a template nucleic acid in the presence of a probe, wherein the target nucleic acid sequence is amplified by an extension reaction from a primer in the presence of the probe.
- the probe of the present invention that is, a probe whose melting temperature of a double-stranded nucleic acid formed from the probe and a complementary strand to the probe is lower than the reaction temperature of the extension reaction, is used. To do.
- the probe used in the present invention is hereinafter referred to as the probe of the present invention.
- the probe is preferably a probe whose melting temperature of a double-stranded nucleic acid formed from the probe and a completely complementary strand to the probe is equal to or lower than the reaction temperature of the extension reaction. .
- the amplification method of the present invention is characterized by using a probe that satisfies the above conditions, and the type and conditions of the nucleic acid amplification method are not limited at all.
- the probe and the above-mentioned The melting temperature of the double-stranded nucleic acid formed from the perfect complementary strand to the probe is equal to or lower than the reaction temperature of the extension reaction ”. That is, the “completely complementary strand” is a condition for specifying the nature of the probe to be used, and the probe forms a double-stranded nucleic acid with the completely complementary strand in use. Is not a condition.
- the present invention does not require, for example, a step of forming a double-stranded nucleic acid from the probe and a completely complementary strand to the primer.
- the target to which the probe hybridizes is a complete complementary strand to the probe.
- the probe may be hybridized to a complementary strand having a mismatch of one base or several bases.
- perfect match means that the probe is perfectly complementary to the probe
- perfect match complementary strand means a complementary strand that perfectly matches the probe, and the probe and the perfect match complementary strand.
- Tm Per value The double-stranded nucleic acid formed from the “perfect match double-stranded nucleic acid” is referred to as “Tm Per value”.
- mismatch means that the probe is completely complementary except for one base (or a plurality of bases)
- mismatch complementary strand means a complementary strand mismatching with the probe, and the probe and the mismatch complementary strand.
- the sequence amplified by the nucleic acid amplification method may be a target sequence and a sequence complementary thereto, or may be a sequence consisting of a region containing the target sequence and a sequence complementary thereto. .
- the probe of the present invention may be any probe as long as the relationship between the Tm Per value of the perfect match and the extension reaction temperature satisfies “Tm Per value ⁇ extension reaction temperature (° C.)”.
- the number is not limited at all.
- Nucleic acid amplification usually includes three steps: melting of double-stranded nucleic acid (dissociation into single-stranded nucleic acid), annealing of primer to single-stranded nucleic acid, and extension of complementary strand from the annealed primer. It is.
- the extension reaction is premised on annealing, and in nucleic acid amplification, for example, the annealing temperature and the extension reaction are generally set to the same temperature. In this case, the “elongation reaction temperature” in the present invention can be replaced with, for example, an annealing temperature.
- the base sequence of the probe of the present invention can be designed so that the Tm value is equal to or lower than the extension reaction temperature.
- the probe design method considering the Tm value is not particularly limited, and a conventionally known method can be adopted.
- the sequence and Tm value of the probe can be determined by, for example, the conventionally known MELTCALC software (http://www.meltcalc.com/) or the nearest base method (Nearest Neighbor Method).
- MELTCALC software http://www.meltcalc.com/
- the nearest base method Nearest Neighbor Method
- the probe of the present invention determines the base sequence according to the extension reaction temperature as described above, and sets the extension reaction temperature according to the Tm Per value of the probe. Conditions may be provided. That is, in the probe of the present invention, it is only necessary that the Tm Per value and the extension reaction temperature of the probe finally satisfy the equation “Tm Per value ⁇ the extension reaction temperature”. Either the base sequence of the probe or the extension reaction temperature may be adjusted.
- the Tm Per value of the double-stranded nucleic acid formed from the probe and the perfect match complementary strand only needs to satisfy “Tm Per value ⁇ extension reaction temperature (° C.)”.
- the difference between the Tm Per value and the extension reaction temperature is, for example, 0 ° C. or more (about 0 ° C. or more), and the upper limit is not particularly limited, but for example, preferably 0 to 30 ° C., more preferably 0 to 20 ° C, more preferably 0 to 10 ° C, particularly preferably 0 to 2 ° C.
- the probe of the present invention comprises a Tm Per value of a double stranded nucleic acid formed from the probe and the perfect match complementary strand, and a Tm Mis value of a double stranded nucleic acid formed from the probe and the mismatch complementary strand. Is preferably 1 ° C. or higher (about 1 ° C. or higher), more preferably 3 ° C. or higher (about 3 ° C. or higher), and particularly preferably 5 ° C. or higher (about 5 ° C.
- the length of the probe is not particularly limited.
- the probe is preferably a relatively long sequence because it can specifically hybridize with a target sequence.
- the length is, for example, 5 to 50 bases, preferably 10 to 30 bases.
- the probe of the present invention may be, for example, an unlabeled probe or a labeled probe labeled with a labeling substance, and the labeled probe is particularly preferable.
- the signal of the labeling substance is measured as a signal value indicating the melting state of the double-stranded nucleic acid between the amplification product and the probe. Can do.
- the labeling substance examples include fluorescent substances such as fluorescent dyes and fluorophores.
- a probe that is labeled with the fluorescent substance exhibits fluorescence alone, and decreases in fluorescence (for example, quenching) by hybridization is preferable.
- a probe using such a fluorescence quenching phenomenon is generally called a fluorescence quenching probe.
- the probe the 3 ′ end or 5 ′ end of the polynucleotide is preferably labeled with a fluorescent substance, and the base at the end to be labeled is preferably C.
- the base that is paired with the terminal base C of the labeled probe or the base that is 1 to 3 bases away from the paired base is G. It is preferable to design the base sequence of the labeled probe.
- a probe is generally called a guanine quenching probe and is known as a so-called QProbe (registered trademark).
- QProbe registered trademark
- the fluorescent substance is not particularly limited, and examples thereof include fluorescent dyes such as fluorescein, phosphor, rhodamine, and polymethine dye derivatives.
- fluorescent dyes such as fluorescein, phosphor, rhodamine, and polymethine dye derivatives.
- commercially available fluorescent substances include BODIPY FL (trademark, manufactured by Molecular Probe Co., Ltd.). ), FluorePrime (trade name, manufactured by Amersham Pharmacia), Fluoredite (trade name, manufactured by Millipore), FAM (manufactured by ABI), Cy3 and Cy5 (manufactured by Amersham Pharmacia), TAMRA (manufactured by Molecular Probes), etc. Pigments.
- each probe When using two or more kinds of probes of the present invention in one reaction system, for example, it is preferable to label each probe with a different fluorescent substance (fluorescent substance detected at different wavelengths).
- the combination of the fluorescent substances is not particularly limited as long as it can be detected under different conditions. For example, Pacific Blue (detection wavelength 450 to 480 nm), TAMRA (detection wavelength 585 to 700 nm) and BODIPY FL (detection wavelength 515 to 555 nm) ) And the like.
- a labeled probe in which a fluorescent dye is labeled at the 5 ′ end may be added with a phosphate group at the 3 ′ end in order to prevent the probe itself from extending in an amplification reaction, for example. Good.
- the nucleic acid amplification method is not particularly limited, and for example, PCR (Polymerase Chain Reaction) method, NASBA (Nucleic acid sequence based amplification) method, TMA (Transcription-mediated amplification) method, SDA (Strand Displacement Amplification).
- PCR Polymerase Chain Reaction
- NASBA Nucleic acid sequence based amplification
- TMA Transcription-mediated amplification
- SDA String Displacement Amplification
- the PCR method is preferable.
- the present invention will be described by taking the PCR method as an example, but the present invention is not limited thereto.
- the sample to which the present invention is applied is not particularly limited as long as it contains a nucleic acid serving as a template, for example.
- Specific examples include, for example, whole blood, oral cells (eg, oral mucosa), somatic cells such as nails and hair, germ cells, sputum, amniotic fluid, paraffin-embedded tissue, urine, gastric juice (eg, gastric lavage fluid), etc. And suspensions thereof.
- the sample addition ratio in the reaction solution for nucleic acid amplification is not particularly limited.
- the lower limit of the addition ratio in the reaction solution is preferably 0.01% by volume or more, and more preferably 0.05% by volume. % Or more, more preferably 0.1% by volume or more.
- the upper limit of the addition ratio is not particularly limited, but is preferably 2% by volume or less, more preferably 1% by volume or less, and still more preferably 0.5% by volume or less.
- the addition ratio of a biological sample such as a whole blood sample in the reaction solution is For example, it is preferably set to 0.1 to 0.5% by volume.
- heat treatment is usually performed for nucleic acid denaturation (dissociation into single-stranded nucleic acid), but this heat treatment denatures sugars and proteins contained in the sample, resulting in insoluble precipitates and turbidity. Etc. may occur.
- the occurrence of such a precipitate or turbidity may affect the measurement accuracy.
- the addition ratio of the whole blood sample in the reaction solution is set within the above-mentioned range, the mechanism is unknown.
- Measurement accuracy by the method can be improved.
- the inhibition of PCR by contaminants in the whole blood sample is sufficiently suppressed, the amplification efficiency can be further improved.
- the ratio of the whole blood sample in the reaction solution is expressed not by the volume ratio (for example, 0.1 to 0.5% by volume) as described above but by the weight ratio of hemoglobin (hereinafter referred to as “Hb”). You can also.
- the ratio of the whole blood sample in the reaction solution is preferably, for example, in the range of 0.565 to 113 g / L, more preferably in the range of 2.825 to 56.5 g / L, in terms of Hb amount. More preferably, it is in the range of 5.65 to 28.25 g / L.
- the addition ratio of the whole blood sample in the reaction solution may satisfy, for example, both the volume ratio and the Hb weight ratio, or may satisfy either one.
- the whole blood may be any of hemolyzed whole blood, unhemolyzed whole blood, anticoagulated whole blood, whole blood containing a coagulated fraction, and the like.
- the template nucleic acid contained in the sample is, for example, DNA.
- the DNA may be DNA originally contained in a sample such as a biological sample, or may be amplification product DNA amplified by nucleic acid amplification. In the latter case, cDNA generated by reverse transcription reaction from RNA (total RNA, mRNA, etc.) originally contained in the sample can be mentioned.
- albumin it is preferable to add albumin to the reaction solution prior to the start of nucleic acid amplification.
- albumin for example, it is possible to further reduce the influence due to the occurrence of precipitates and turbidity as described above, and to further improve the amplification efficiency.
- the addition ratio of albumin in the reaction solution is, for example, in the range of 0.01 to 2% by weight, preferably 0.1 to 1% by weight, more preferably 0.2 to 0.8% by weight.
- the albumin is not particularly limited, and examples thereof include bovine serum albumin (BSA), human serum albumin, rat serum albumin, horse serum albumin and the like. Any one of these may be used, or two or more may be used in combination. May be.
- the target nucleic acid is amplified by PCR using DNA as a template nucleic acid and a primer for amplifying the target nucleic acid in the presence of the probe of the whole blood sample.
- PCR PCR
- a primer for amplifying the target nucleic acid in the presence of the probe of the whole blood sample An example will be described.
- the present invention is characterized by using the probe of the present invention, and other configurations and conditions are not limited at all.
- a PCR reaction solution is prepared.
- the addition ratio of the probe in the reaction solution is not particularly limited, but for example, it is preferably added to the reaction solution so as to be in the range of 10 to 400 nmol / L, more preferably 20 to 200 nmol / L.
- a fluorescent substance is used as a probe label
- an unlabeled probe having the same sequence as the labeled probe may be used in combination.
- Phosphoric acid may be added to the 3 ′ end.
- the molar ratio of labeled probe to unlabeled probe is preferably, for example, 1:10 to 10: 1.
- the addition ratio of the primer in the reaction solution is not particularly limited, but for example, it is preferably added to be 0.1 to 2 ⁇ mol / L, more preferably 0.25 to 1.5 ⁇ mol / L, and particularly 0.5 to 1 ⁇ mol / L is preferred.
- a primer a pair of primer set which consists of a forward primer and a reverse primer can be used, In this case, it is preferable to add both primers in the above-mentioned range.
- the addition ratio (molar ratio F: R) of the forward primer (F) and the reverse primer (R) is not particularly limited, but is preferably 1: 0.25 to 1: 4, and more preferably 1: 0. 5 to 1: 2.
- the primer and the primer set may be, for example, one type or two or more types.
- the primer to be used can be appropriately used depending on the number of target sequences to be amplified in one reaction solution, for example.
- the ratio of the whole blood sample in the reaction solution is not particularly limited, but the above-mentioned range is preferable.
- the whole blood sample may be added to the reaction solution as it is, or may be diluted with a solvent such as water or a buffer solution in advance and then added to the reaction solution.
- the dilution rate is not particularly limited.
- the final whole blood addition ratio in the reaction solution can be set to fall within the above range, but is, for example, 100 to 2000 times. Preferably, it is 200 to 1000 times.
- composition components in the reaction solution are not particularly limited, and examples thereof include conventionally known components, and their ratios are not particularly limited.
- the composition component include DNA polymerase, nucleotide (nucleoside triphosphate (dNTP)), and solvent.
- the reaction solution preferably further contains albumin.
- the addition order of each composition component is not restrict
- the DNA polymerase is not particularly limited, and for example, a conventionally known heat-resistant bacterium-derived polymerase can be used. Specific examples include DNA polymerase derived from Thermus aquaticus (US Pat. Nos. 4,889,818 and 5,079,352) (trade name Taq polymerase), Thermus thermophilus ( Thermus thermophilus ).
- DNA polymerase (WO 91/09950) (rTth DNA polymerase), Pyrococcus furiosus DNA polymerase (WO 92/9689) (manufactured by Stratagene), Thermococcus litoralis ( Thermococcus ) DNA polymerase (EP-A 455 430) (Trademark: Vent: New England Biolabs), derived from Thermococcus kodakaraensis DNA polymerase (trade name KOD DNA polymerase) and the like are commercially available. Among them, thermostable DNA polymerase derived from Thermus aquaticus is preferable.
- the addition rate of DNA polymerase in the reaction solution is not particularly limited, but is, for example, 1 to 100 U / mL, preferably 5 to 50 U / mL, and more preferably 20 to 30 U / mL.
- the activity unit (U) of DNA polymerase is generally an activity that incorporates 10 nmol of all nucleotides into an acid-insoluble precipitate in an activity measurement reaction solution at 74 ° C. for 30 minutes using activated salmon sperm DNA as a template primer. Is 1U.
- the composition of the reaction liquid for activity measurement is, for example, 25 mmol / L TAPS buffer (pH 9.3, 25 ° C.), 50 mmol / L KCl, 2 mmol / L MgCl 2 , 1 mmol / L mercaptoethanol, 200 ⁇ mol / L dATP, 200 ⁇ mol / L dGTP, 200 ⁇ mol / L dTTP, 100 ⁇ mol / L [ ⁇ - 32 P] dCTP, 0.25 mg / mL activated salmon sperm DNA.
- nucleoside triphosphate usually include dNTP (dATP, dCTP, dGTP, dTTP, and / or dUTP).
- dNTP dATP, dCTP, dGTP, dTTP, and / or dUTP.
- the addition rate of dNTP in the reaction solution is not particularly limited, but is, for example, 0.01 to 1 mmol / L, preferably 0.05 to 0.5 mmol / L, more preferably 0.1 to 0. .3 mmol / L.
- solvent examples include buffer solutions such as Tris-HCl, Tricine, MES, MOPS, HEPES, and CAPS, and commercially available buffer solutions for PCR and commercially available PCR kits can be used.
- the PCR reaction solution may further contain glycerol, heparin, betaine, KCl, MgCl 2 , MgSO 4 , DMSO, etc., and the addition ratio thereof may be set within a range that does not inhibit the PCR reaction, for example. That's fine.
- the total volume of the reaction solution is not particularly limited and can be appropriately determined depending on, for example, the equipment (thermal cycler) to be used, a container such as a tube or a chip, and is usually 1 to 500 ⁇ L, preferably 10 ⁇ 100 ⁇ L.
- PCR is performed.
- PCR usually involves three steps: (1) dissociation of double-stranded nucleic acid into single-stranded nucleic acid, (2) annealing of primer to single-stranded nucleic acid, and (3) extension of annealed primer (polymerase reaction).
- the temperature condition in each step is not particularly limited as long as the extension reaction temperature in (3) is equal to or higher than the Tm Per value of the probe as described above.
- the dissociation step (1) is, for example, 1 to 120 seconds at 90 to 99 ° C., preferably 1 to 60 seconds at 92 to 95 ° C.
- the annealing step (2) is, for example, 1 at 40 to 70 ° C. -300 seconds, preferably 50-70 ° C. for 5-60 seconds
- the extension step (3) is, for example, conditions of 50-80 ° C., 1-300 seconds, preferably 50-75 ° C., 5-60 seconds However, it is not limited to this.
- the number of PCR cycles is not particularly limited, but is preferably, for example, 30 cycles or more, and the upper limit is not particularly limited.
- the total number is 100 cycles or less, preferably 70 cycles or less, and more preferably 50 cycles or less.
- the target sequence can be amplified in the presence of the probe of the present invention.
- the target sequence since the annealing of the primer to the template nucleic acid and the extension from the annealed primer are difficult to be inhibited by the probe, the target sequence has a complementary strand of a perfect match and a complementary complement of the probe. Even if it contains any of the strands, it is possible to amplify with higher efficiency than before.
- the amplification method of the present invention can also be said to be a method for producing an amplified product of a target sequence.
- the amplification method of the present invention may further include a step of detecting an amplification product of the target sequence obtained by the amplification reaction described above. Thereby, the presence or absence of the amplification product and the polymorphism in the target sequence can also be detected.
- the one form is demonstrated below as a target sequence analysis method of the present invention.
- the target sequence analysis method of the present invention is a method for analyzing a target nucleic acid sequence using a probe capable of hybridizing to the target nucleic acid sequence, and includes the following steps (A) and (B): It is characterized by.
- the target sequence analysis method of the present invention for example, presence / absence of amplification of the target sequence, discrimination of polymorphism in the target sequence, and the like can be performed.
- the analysis method of the present invention is characterized in that the target sequence is amplified by the amplification method of the present invention, that is, the target sequence is amplified in the presence of the probe of the present invention. Etc. are not limited at all.
- the target sequence analysis method of the present invention preferably further includes the following step (C).
- step (C) A step of analyzing the target sequence from a change in the signal value accompanying a temperature change
- the step (C) is preferably a melting curve analysis using a melting curve representing a change in signal value accompanying a temperature change.
- the melting curve is generally a graph showing the relationship between each temperature and a signal value indicating the melting state of the sample or a differential value of the signal value (hereinafter referred to as “signal differential value”).
- signal differential value a signal value indicating the melting state of the sample or a differential value of the signal value.
- the melting curve is preferably a graph showing the relationship between the temperature and the signal differential value because the amount of change in signal is easy to judge.
- the signal differential value may be represented by “dF / dT” or “ ⁇ dF / dT”, for example.
- dF represents the amount of change in signal value
- dT represents the amount of change in temperature.
- the melting curve in which the signal differential value is represented by “dF / dT” has a valley-shaped peak, and the signal differential value is represented by “ ⁇ dF / dT”. In the curve, the peak has a mountain shape.
- the peak is a mountain shape, and the melting curve in which the signal differential value is represented by “ ⁇ dF / dT”.
- the peak is valley-shaped.
- the signal may be generated by, for example, non-melting of the sample, and may be suppressed by melting of the sample. Conversely, the signal may be suppressed by non-melting of the sample and generated by melting of the sample. There may be. Whether the signal is generated by melting or non-melting of the sample, and when the signal differential value is expressed by any of the above formulas, the peak size is evaluated by the absolute value of the signal differential value. Is possible.
- the target sequence is a sequence having a detection target site that causes the polymorphism
- the probe of the present invention is complementary to this. It becomes an array.
- part of the said target sequence can be analyzed from the fluctuation
- the probe is a mutant probe, if a peak is detected in the vicinity of the Tm Per value (that is, the Tm mut value), the polymorphism is a mutant type, and the peak is in the vicinity of the Tm Mis value (that is, the Tm wild value).
- the polymorphism can be determined as a wild type. Further, if a peak is detected only in one Tm value, it can be determined as a homozygous polymorphism, and if a peak is detected in both Tm values, it can be determined as a heterozygous polymorphism.
- polymorphisms in the detection target site are referred to as a mutant type and a wild type, but this is for convenience and does not limit the present invention.
- the signal value indicating the melting state of the double-stranded nucleic acid between the amplification product and the probe may be measured by measuring the absorbance at 260 nm as described above, or by measuring the signal of the labeling substance.
- the former is preferably employed, for example, when the probe of the present invention is an unlabeled probe.
- the latter is preferably employed, for example, when the probe of the present invention is a labeled probe labeled with a labeling substance.
- the labeled probe include a labeled probe that shows a signal alone and does not show a signal by hybridization, or a labeled probe that does not show a signal alone and shows a signal by hybridization.
- two or more target sequences can be analyzed in the same reaction solution, or polymorphisms of two or more detection target sites in one target sequence can be analyzed.
- two or more kinds of probes of the present invention may be added to the nucleic acid amplification reaction solution in the step (A) according to the target sequence to be analyzed and the site to be detected.
- each is labeled with a different labeling substance that can be detected under different conditions.
- a PCR reaction solution containing a labeled probe and a primer for amplifying the target sequence is prepared, PCR is performed, and the target sequence is amplified.
- the reaction solution includes, for example, a sample containing the probe, primer, DNA polymerase, dNTP and template nucleic acid of the present invention.
- the reaction solution may contain various additives that can be used for nucleic acid amplification.
- dissociation of the obtained amplification product for example, dissociation into single-stranded nucleic acid such as double-stranded DNA
- dissociated single-stranded nucleic acid and the labeled probe Hybridize with This can be performed, for example, by changing the temperature of the reaction solution.
- the heating temperature in the dissociation step is not particularly limited as long as the amplification product can be dissociated, and is, for example, 85 to 95 ° C.
- the heating time is not particularly limited, but is usually 1 second to 10 minutes, preferably 1 second to 5 minutes.
- Hybridization of the dissociated single-stranded nucleic acid and the labeled probe can be performed, for example, by lowering the heating temperature in the dissociation step after the dissociation step.
- the temperature condition is not particularly limited, but it is preferably lower than the Tm Per value of the labeled probe when confirming whether the target sequence is a perfect match for the probe. Moreover, when confirming whether a target sequence is a mismatch with respect to the said probe, and also confirming whether it is a perfect match or a mismatch, it is preferable that it is lower than Tm Mis value.
- the hybridization temperature is not particularly limited, but is generally 40 to 50 ° C., for example.
- the temperature of the reaction solution is changed, and a signal value indicating the melting state of the hybridized product of the amplification product and the labeled probe is measured.
- the reaction solution hybridized body of the single-stranded DNA and the labeled probe
- a change in signal value accompanying a temperature rise is measured.
- the fluorescence decreases (or quenches) in the hybridized state with the single-stranded DNA, and in the dissociated state. Emits fluorescence. Therefore, for example, the hybrid formed body in which the fluorescence is decreased (or quenched) may be gradually heated, and the increase in the fluorescence intensity accompanying the temperature increase may be measured.
- the temperature range for measuring the fluctuation of the fluorescence intensity is not particularly limited.
- the start temperature is room temperature to 85 ° C., preferably 25 to 70 ° C.
- the end temperature is 40 to 105 ° C., for example. is there.
- the rate of temperature increase is not particularly limited, but is, for example, 0.1 to 20 ° C./second, preferably 0.3 to 5 ° C./second.
- the target sequence is analyzed from the fluctuation of the signal.
- the Tm Per value and the Tm Mis value are determined in advance.
- the amount of change in fluorescence intensity per unit time at each temperature is calculated from the obtained fluorescence intensity, and it is confirmed whether any of the Tm Per value and Tm Mis value shows the largest absolute value. .
- a melting curve in which the temperature and “ ⁇ d fluorescence intensity increase / dT” are plotted is created, and a valley type that shows the lowest value in either of the Tm Per value and the Tm Mis value is prepared. Check if a peak exists.
- either of the Tm Per value and the Tm Mis value has a mountain-shaped peak indicating the highest value. Check if it exists. As a result, if a peak is confirmed near the Tm Per value, it can be determined that the target sequence is a perfect match with the probe, and if a peak is confirmed near the Tm Mis value, the target sequence is It can be determined that there is a mismatch with the probe.
- the perfect match is a variant for the polymorphism
- the mismatch is the wild type for the polymorphism
- the perfect match is A polymorphism can be determined to be a wild type, and a mismatch can be determined to be a mutant type.
- fluorescence is emitted when hybridized with single-stranded DNA, and fluorescence is emitted when dissociated with a probe that reduces (or quenches) fluorescence. What is necessary is just to heat a hybrid body gradually and to measure the reduction
- the present invention instead of the method of measuring the signal fluctuation accompanying the temperature rise by raising the temperature of the reaction solution containing the probe, for example, measuring the signal fluctuation at the time of hybridization. You may go. That is, when the hybrid is formed by lowering the temperature of the reaction solution containing the probe, the signal fluctuation accompanying the temperature drop may be measured.
- a labeled probe for example, a guanine quenching probe
- a labeled probe that shows a signal alone and does not show a signal by hybridization
- the temperature of the reaction solution may be gradually decreased to measure the decrease in fluorescence intensity accompanying the temperature decrease.
- a labeled probe that does not show a signal alone and shows a signal by hybridization it does not emit fluorescence when the single-stranded DNA and the probe are dissociated, but the hybrid is not released due to a decrease in temperature. Once formed, it will fluoresce. Therefore, for example, the temperature of the reaction solution may be gradually lowered and the increase in fluorescence intensity accompanying the temperature drop may be measured.
- the method for suppressing amplification inhibition according to the present invention is a method for suppressing amplification inhibition that suppresses the inhibition of amplification of the target sequence in the amplification of the target sequence in the presence of a probe.
- the method is the amplification method of the present invention.
- the present invention is characterized in that in the amplification of a target sequence in the presence of a probe, the amplification method of the present invention is performed, that is, the target sequence is amplified in the presence of the probe of the present invention. There are no restrictions.
- the present invention can be performed in the same manner as the amplification method of the present invention.
- the probe of the present invention is a probe for use in the amplification method of the present invention or the amplification inhibition suppression method of the present invention, and is formed by two probes formed from the probe and a complementary strand to the probe.
- the probe is characterized in that the melting temperature of the strand nucleic acid is a probe showing a temperature equal to or lower than the reaction temperature of the extension reaction. It is preferable that the probe has a melting temperature of a double-stranded nucleic acid formed from the probe and a completely complementary strand to the probe that is equal to or lower than the reaction temperature of the extension reaction. Specifically, it is as described in the amplification method of the present invention.
- the probe of the present invention can be used in the suppression method, amplification method and analysis method of the present invention.
- the amplification reagent of the present invention is a reagent for use in the amplification method, suppression method or analysis method of the present invention, and is characterized by including the probe of the present invention.
- the amplification reagent of the present invention is not limited as long as it contains the probe of the present invention.
- the amplification reagent of the present invention may further contain, for example, a primer for amplifying the target sequence, a polymerase such as DNA polymerase, dNTP and the like.
- the form of the amplification reagent of the present invention is not particularly limited, and may be, for example, a liquid reagent or a dry reagent suspended in a solvent before use. Further, the content of the probe of the present invention and other components such as the primer is not particularly limited.
- the amplification reagent of the present invention may be, for example, an amplification kit. For example, each reagent may be contained in the same container or a separate container. The amplification kit preferably further includes instructions for use.
- the probe designing method of the present invention is a method for designing a probe for use in a method for amplifying a target nucleic acid sequence in a template nucleic acid in the presence of a probe, the probe comprising the probe and a complementary strand to the probe.
- the melting temperature of the double-stranded nucleic acid formed from is designed so as to be lower than the reaction temperature of the extension reaction.
- the probe is preferably designed so that the melting temperature of the double-stranded nucleic acid formed from the probe and a completely complementary strand to the probe is lower than the reaction temperature of the extension reaction.
- the design method of the present invention can be performed in the same manner as the method described in the amplification method of the present invention.
- the present invention can also be referred to as a probe manufacturing method, and includes a step of designing a probe as described above.
- the genome was purified from the blood of a subject exhibiting heterozygous polymorphism CYP2C9 * 3 using a kit (trade name: QIAamp DNA Mini kit; manufactured by QIAGEN).
- the purified genome was diluted 1/10 (volume) with TE (10 mmol / L Tris-HCl, 1 mmol / L EDTA). 1 ⁇ L of this diluted purified genome was added to 49 ⁇ L of PCR reagent having the following composition, and PCR was performed using a thermal cycler. As PCR conditions, after treatment at 95 ° C. for 60 seconds, a double-strand dissociation treatment of 1 second and an extension reaction treatment of 15 seconds were repeated for 50 cycles.
- the temperature of the dissociation treatment was 95 ° C.
- the temperature of the extension reaction treatment (including annealing treatment) was a predetermined temperature (52 ° C., 58 ° C. or 60 ° C.).
- the reaction solution is further treated at 95 ° C. for 1 second and at 40 ° C. for 60 seconds, followed by heating from 40 ° C. to 95 ° C. with a temperature increase rate of 1 ° C./3 seconds.
- the change in fluorescence intensity over time was measured.
- the measurement wavelength was 515 to 555 nm (detection of fluorescent dye BODIPY FL).
- CYP2C9 * 3 F primer (SEQ ID NO: 1) 5'-gagcccctgcatgcaa-3 ' CYP2C9 * 3 R primer (SEQ ID NO: 2) 5'-gatactatgaatttggggacttcgaa-3 ' (Mutant detection probe) CYP2C9 * 3 probe (SEQ ID NO: 3) 5'-gggagaagGtcaAGgTatc- (BODIPY FL) -3 '
- the Tm Per value of a hybrid (perfect match double strand) of a CYP2C9 * 3 probe for detecting a mutant type and a complementary strand perfectly complementary to the probe is 58 ° C.
- the Tm Mis value of a hybrid (mismatched duplex) of the CYP2C9 * 3 probe and a complementary strand that is completely complementary to the probe except for one base of the detection target site is 53 ° C.
- FIGS. These results are shown in FIGS. These graphs are graphs of melting curves showing changes in fluorescence intensity with increasing temperature, the differential value on the vertical axis indicates “ ⁇ d fluorescence intensity increase / dT” ( ⁇ dF / dT), and the horizontal axis on the horizontal axis. Indicates temperature.
- FIG. 1 is a graph showing a melting curve when the PCR extension reaction temperature is set to 52 ° C.
- FIG. 2 is a graph showing a melting curve when the extension reaction temperature is set to 58 ° C.
- FIG. It is a graph which shows a melting curve at the time of setting the said extension reaction temperature to 60 degreeC.
- the extension reaction temperature is 58 ° C.
- the extension reaction temperature is In the case of 60 ° C.
- the relationship between the Tm value of the perfect match duplex and the extension reaction temperature is “Tm Per value ⁇ extension reaction temperature”, which satisfies the conditions of the present invention.
- the present invention even when the target sequence is amplified in the presence of the probe, the probe is difficult to hybridize to the template nucleic acid at the reaction temperature of the extension reaction. For this reason, the annealing of the primer to the template nucleic acid and the extension reaction from the primer are hardly inhibited by the probe, and as a result, the target sequence can be sufficiently amplified. Therefore, according to the present invention, for example, in Tm analysis, the presence or absence of a peak can be determined with higher reliability than in the past. Therefore, the present invention can be said to be a very useful technique particularly in the field of gene analysis.
Abstract
Description
前記標的核酸配列にハイブリダイズ可能なプローブの存在下、プライマーからの伸長反応により前記標的核酸配列を増幅する工程を含み、
前記プローブとして、前記プローブと前記プローブに対する相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブを使用することを特徴とする。本発明において、以下、標的核酸配列を標的配列ともいう。
(A)本発明の増幅方法により、前記プローブの存在下、鋳型核酸における前記標的核酸配列の増幅を行う工程
(B)前記(A)工程の後、前記(A)工程の反応液の温度を変化させ、得られた増幅産物と前記プローブとの二本鎖核酸の融解状態を示すシグナル値を測定する工程
本発明の増幅方法は、前述のように、プローブ存在下で鋳型核酸における標的核酸配列を増幅する方法であって、前記プローブの存在下、プライマーからの伸長反応により前記標的核酸配列を増幅する工程を含み、
前記プローブとして、本発明のプローブ、すなわち、前記プローブと前記プローブに対する相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブを使用することを特徴とする。本発明において使用する前記プローブを、以下、本発明のプローブという。本発明の増幅方法において、前記プローブは、前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブであることが好ましい。
本発明の標的配列の解析方法は、前述のように、標的核酸配列にハイブリダイズ可能なプローブを用いた前記標的核酸配列の解析方法であって、下記(A)および(B)工程を有することを特徴とする。
(A)本発明の増幅方法により、前記プローブの存在下、前記標的核酸配列の増幅を行う工程
(B)前記(A)工程の後、前記(A)工程の反応液の温度を変化させ、得られた増幅産物と前記プローブとの二本鎖核酸の融解状態を示すシグナル値を測定する工程
(C)温度変化に伴う前記シグナル値の変動から、前記標的配列の解析を行う工程
本発明の増幅阻害の抑制方法は、前述のように、プローブ存在下での標的配列の増幅において、前記標的配列の増幅の阻害を抑制する増幅阻害の抑制方法であって、前記標的配列の増幅方法が、本発明の増幅方法であることを特徴とする。本発明は、プローブ存在下での標的配列の増幅において、本発明の増幅方法を行うこと、すなわち、本発明のプローブ存在下で標的配列を増幅することが特徴であり、その他の構成や条件は何ら制限されない。なお、本発明は、前記本発明の増幅方法と同様にして行うことができる。
本発明のプローブは、前述のように、本発明の増幅方法または本発明の増幅阻害の抑制方法に使用するためのプローブであって、前記プローブと前記プローブに対する相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブであることを特徴とする。前記プローブは、前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すことが好ましい。具体的には、本発明の増幅方法で記載した通りである。本発明のプローブは、本発明の抑制方法、増幅方法および解析方法に使用できる。
本発明の増幅用試薬は、本発明の増幅方法、抑制方法または解析方法に使用するための試薬であって、本発明のプローブを含むことを特徴とする。本発明の増幅用試薬は、本発明のプローブを含んでいればよく、その他の構成は何ら制限されない。本発明の増幅試薬は、例えば、さらに、標的配列を増幅するためのプライマー、DNAポリメラーゼ等のポリメラーゼ、dNTP等を含んでもよい。
本発明のプローブの設計方法は、プローブ存在下で鋳型核酸における標的核酸配列を増幅する方法に使用するための前記プローブの設計方法であって、前記プローブを、前記プローブと前記プローブに対する相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すように設計することを特徴とする。本発明において、前記プローブは、前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すように設計することが好ましい。本発明の設計方法は、具体的には、前記本発明の増幅方法において説明した方法と同様に行うことができる。また、本発明は、プローブの製造法ともいうことができ、前述のようにプローブを設計する工程を含む。
CYP2C9*3 Fプライマー (配列番号1)
5'-gagcccctgcatgcaa-3'
CYP2C9*3 Rプライマー (配列番号2)
5'-gatactatgaatttggggacttcgaa-3'
(変異型検出用プローブ)
CYP2C9*3 プローブ (配列番号3)
5'-gggagaagGtcaAGgTatc-(BODIPY FL)-3'
Claims (22)
- プローブ存在下で鋳型核酸における標的核酸配列を増幅する方法であって、
前記標的核酸配列にハイブリダイズ可能なプローブの存在下、プライマーからの伸長反応により前記標的核酸配列を増幅する工程を含み、
前記プローブとして、前記プローブと前記プローブに対する相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブを使用することを特徴とする増幅方法。 - 前記プローブとして、前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブを使用する、請求の範囲1記載の増幅方法。
- 前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度と、前記伸長反応の反応温度との差が、約0℃以上である、請求の範囲2記載の増幅方法。
- 前記プローブが、
前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度と、前記プローブと前記プローブに対して1塩基を除いて完全な相補鎖とから形成される二本鎖核酸の融解温度との差が、約1℃以上を示すプローブである、請求の範囲2記載の増幅方法。 - 前記プローブが、標識物質で標識化された標識化プローブである、請求の範囲1記載の増幅方法。
- 前記標識物質が、蛍光物質である、請求の範囲4記載の増幅方法。
- プローブ存在下での鋳型核酸における標的核酸配列の増幅において、前記標的核酸配列の増幅の阻害を抑制する増幅阻害の抑制方法であって、
前記標的核酸配列の増幅方法が、請求の範囲1記載の増幅方法であることを特徴とする抑制方法。 - 標的核酸配列にハイブリダイズ可能なプローブを用いた前記標的核酸配列の解析方法であって、
下記(A)および(B)工程を有することを特徴とする標的核酸配列の解析方法。
(A)請求の範囲1記載の増幅方法により、前記プローブの存在下、鋳型核酸における前記標的核酸配列の増幅を行う工程
(B)前記(A)工程の後、前記(A)工程の反応液の温度を変化させ、得られた増幅産物と前記プローブとの二本鎖核酸の融解状態を示すシグナル値を測定する工程 - さらに、下記(C)工程を有する、請求の範囲8記載の解析方法。
(C)温度変化に伴う前記シグナル値の変動から、前記標的配列の解析を行う工程 - 前記(C)工程が、温度変化に伴うシグナル値の変動を表す融解曲線を用いた融解曲線解析である、請求の範囲9記載の解析方法。
- 前記標的核酸配列が、多型を生じる検出対象部位を有する配列であり、
前記(C)工程において、前記シグナル値の変動から、前記標的核酸配列の検出対象部位における多型を解析する、請求の範囲9記載の解析方法。 - 前記(C)工程において、前記シグナル値の変動から、前記標的核酸配列の増幅の有無を解析する、請求の範囲9記載の解析方法。
- 前記プローブが、標識物質で標識化された標識化プローブである、請求の範囲8記載の解析方法。
- 前記標識物質が蛍光物質であり、前記(B)工程におけるシグナル値が、蛍光強度である、請求の範囲13記載の解析方法。
- 請求の範囲1記載の増幅方法に使用するためのプローブであって、
前記プローブが、
前記プローブと前記プローブに対する相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブであることを特徴とするプローブ。 - 前記プローブが、
前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すプローブである、請求の範囲15記載のプローブ。 - 前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度と、前記伸長反応の反応温度との差が、約0℃以上である、請求の範囲16記載のプローブ。
- 前記プローブと前記プローブに対して完全に相補的な相補鎖とから形成される二本鎖核酸の融解温度と、前記プローブと前記プローブに対して1塩基を除いて完全な相補鎖とから形成される二本鎖核酸の融解温度との差が、約1℃以上を示すプローブである、請求の範囲16記載のプローブ。
- 前記プローブが、標識物質で標識化された標識化プローブである、請求の範囲15記載のプローブ。
- 前記標識物質が、蛍光物質である、請求の範囲19記載のプローブ。
- プローブ存在下で鋳型核酸における標的核酸配列を増幅する方法に使用するための前記プローブの設計方法であって、
前記プローブを、前記プローブと前記プローブに対する相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すように設計することを特徴とするプローブ設計方法。 - 前記プローブを、前記プローブと前記プローブに対する完全な相補鎖とから形成される二本鎖核酸の融解温度が、前記伸長反応の反応温度以下を示すように設計する、請求の範囲21記載のプローブ設計方法。
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US12/810,266 US20100273173A1 (en) | 2007-12-26 | 2008-12-25 | Method for amplifying target nucleic acid sequence and probe used for the same |
JP2009522264A JPWO2009081967A1 (ja) | 2007-12-26 | 2008-12-25 | 標的核酸配列の増幅方法およびそれに用いるプローブ |
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KR20090127893A (ko) | 2009-12-14 |
US20100273173A1 (en) | 2010-10-28 |
EP2224017A1 (en) | 2010-09-01 |
EP2224017A4 (en) | 2011-05-04 |
JPWO2009081967A1 (ja) | 2011-05-06 |
CN101646786A (zh) | 2010-02-10 |
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