WO2006064745A1 - 塩基多型の同定方法 - Google Patents
塩基多型の同定方法 Download PDFInfo
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- WO2006064745A1 WO2006064745A1 PCT/JP2005/022741 JP2005022741W WO2006064745A1 WO 2006064745 A1 WO2006064745 A1 WO 2006064745A1 JP 2005022741 W JP2005022741 W JP 2005022741W WO 2006064745 A1 WO2006064745 A1 WO 2006064745A1
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- oligonucleotide
- nucleotide polymorphism
- enzyme
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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
- C12Q1/6813—Hybridisation assays
- C12Q1/6827—Hybridisation assays for detection of mutation or polymorphism
Definitions
- the present invention relates to a method for analyzing a nucleic acid sequence. More specifically, the present invention relates to a nucleic acid sequence analysis method capable of simultaneously detecting a plurality of nucleotide polymorphisms contained in a sample.
- the nucleic acid sequence analysis method of the present invention is useful in genetic engineering, molecular biology, and related industrial fields.
- the nucleotide polymorphism is a genotype having a sequence different from the wild type, and the polymorphic gene plays an important role as a cause of inter-individual variation in the occurrence of side effects and treatment failures in drug metabolism.
- the polymorphic gene plays an important role as a cause of inter-individual variation in the occurrence of side effects and treatment failures in drug metabolism.
- It is also known as a cause of individual differences such as basal metabolism known as constitution.
- they also serve as genetic markers for many diseases. Therefore, elucidation of these mutations is clinically important, and routine phenotyping is particularly recommended for psychiatric patients and volunteers in clinical studies (see, for example, Non-Patent Documents 1 and 2). Therefore, a nucleic acid sequence analysis method for detection of each genotype following identification of the causative polymorphic gene is desirable.
- nucleic acid sequencing can detect and identify nucleotide polymorphisms contained in nucleic acid sequences, but it requires a great deal of effort to prepare vertical nucleic acids, polymerase reactions, polyacrylamide gel electrophoresis, and analysis of nucleic acid sequences. And time is needed. In addition, there is a problem that an expensive device that can save labor by using an automatic sequencer in recent years is required.
- a Southern hybridization method see, for example, Non-Patent Document 3
- a DNA region having a base sequence complementary to a labeled DNA probe can be identified. That is, in the Southern hybridization method, nucleic acid fragments are electrophoresed on a flat plate of agarose gel or polyacrylamide gel, and the size of the fragments is determined.
- nucleic acid fragments After separation by (length), it is denatured into a single strand, and -trocellulose or A membrane such as nylon is affixed, the nucleic acid fragments are transferred and fixed as they are in the electrophoresis pattern, and then hybridized with a nucleotide polymorphism-specific DNA probe labeled with RI (radioisotope) or the like to form a probe. Detect nucleic acid fragments on the complementary membrane by autoradiography or the like.
- the Southern hybridization method it is possible to determine the electrophoresis position and molecular weight of the target nucleic acid fragment, but it takes a long time for operations such as electrophoresis and autoradiography. Since it is detected only by the fact that it cannot be analyzed quickly, or by the ability to hybridize with nucleotide polymorphism-specific DNA probes, the presence or absence of nucleotide polymorphisms must be determined without strict probe specificity. There were problems such as difficulty in identifying similar sequences for detection.
- a method for identifying a nucleic acid sequence using an enzyme a method using a ligase (for example, see Patent Documents 1 and 2) and a method using a nuclease (for example, see Patent Document 3) are known.
- OLA oligonucleotide ligation assembly
- two probes or probe elements that span the desired target region are hybridized to the target region.
- the probe element makes a base pair with an adjacent target base
- the opposite ends of the probe element are linked by a ligation reaction, for example, by ligase treatment.
- the ligated probe element is assayed to reveal the presence of the target sequence.
- a hybridization using a solid phase called a DNA microarray (DNA chip) in which a plurality of detection oligonucleotide probes are bound to the solid phase.
- DNA chip DNA microarray
- a number of liquid processing steps are required and several incubation and wash temperatures must be carefully controlled to maintain the stringency required for single nucleotide mismatch identification. Since the optimal hybridization conditions vary greatly depending on the probe sequence, this method is difficult to multiplex.
- a method has also been disclosed in which polymorphisms can be analyzed by DNA microarray using several tens of oligonucleotides per one polymorphic sequence to solve this problem (see, for example, Patent Document 4).
- analysis is performed using a specialized array of probes that are tiled based on each polymorphic form.
- Tiling refers to the use of a group of related fixed probe probes, some exhibiting complete complementarity to the reference sequence, and others indicating a reference sequence power mismatch. (For example, see Patent Document 5).
- this method is very costly because several tens of oligonucleotides are used for one type of polymorphism.
- a method of measuring a plurality of polymorphisms with a DNA microarray by ligating a polymorphism with a ligase and specifically measuring with a DNA microarray is also disclosed (see, for example, Patent Document 6).
- This method can reduce the number of oligonucleotides on the DNA microarray. Since only ligase is used for ligation of oligonucleotides, an oligonucleotide with a phosphate group attached to the end is necessary and the cost is high.
- a ligation reaction occurs with any oligonucleotide adjacent to the oligonucleotide, and nonspecific ligation is likely to occur. In particular, the risk increases as the number of polymorphs to be analyzed increases.
- Patent Document 1 Japanese Patent Publication No. 6-44880
- Patent Document 2 Japanese Patent No. 2622255
- Patent Document 3 JP-A-3-43098
- Patent Document 4 Japanese Patent Laid-Open No. 2002-514091
- Patent Document 5 EP730663
- Patent Document 6 Japanese Patent Laid-Open No. 2000-511060
- Non-Special Reference 1 European Consensus Conference on Pharmacogenetics.
- Non-Patent Document 2 European Journal Of Clinical Pharmacology 36, pp. 51-554 (issued in 1989)
- Non-Patent Document 3 Laboratory Manual Genetic Engineering Supplement, Pages 70-75 (issued in 1996) Brief Description of Drawings
- FIG. 1 A diagram showing a part of the reaction mechanism of the present invention.
- an object of the present invention is to provide a nucleic acid sequence analysis method excellent in easily and simultaneously detecting the types of a plurality of nucleotide polymorphisms contained in a sample.
- the present invention relates to a method for simultaneously identifying a plurality of nucleotide polymorphisms.
- the first oligonucleotide and the second oligonucleotide are ligated using an enzyme having a nuclease activity and an enzyme having a ligase activity to generate a ligated oligonucleotide, which is complementary to the ligated oligonucleotide.
- Arrangement A method for identifying a polynucleotide polymorphism characterized by identifying the type of the linked oligonucleotide using a detection probe having a sequence.
- the first oligonucleotide for detecting the wild type and the first oligonucleotide for detecting the polymorphism are labeled with fluorescent substances having different fluorescence wavelengths. 6 Or 7 multiple nucleotide polymorphism identification method.
- the detection probe comprises a sequence complementary to at least a part of the first oligonucleotide and the second oligonucleotide.
- any one of 1 to 3 characterized in that the detection probe includes a portion of a polymorphic sequence The multiple nucleotide polymorphism identification method.
- a 14-nucleotide polymorphism identification method wherein the solid phase on which the detection probe is immobilized is a DNA microarray.
- a method for identifying 16 multi-nucleotide polymorphisms characterized in that the amplification method is any method selected from the group consisting of PCR, NASBA, LCR, SDA, RCR and TMA.
- An 18-nucleotide polymorphism identification method wherein the amplification method is any method selected from the group consisting of PCR, NASBA, LCR, SDA, RCR and TMA.
- Enzyme containing ligase activity is T4 DNA ligase, Ecoli DNA ligase, RNA ligase zeta, or at least one selected enzyme, One to three polynucleotide polymorphisms Identification method.
- thermostable enzyme is derived from Tth, Taq, KOD or Pfo Nucleotide polymorphism identification method.
- Tth-derived metathermic DNA polymerase One or two species selected from the group consisting of Tth-derived metathermic DNA polymerase, Taq-derived metathermic D ⁇ polymerase, KOD-derived metathermic DNA polymerase, and Pfo-derived metathermic DNA polymerase 26.
- nucleotide polymorphism includes any of a single nucleotide polymorphism, an insertion, and a deletion polymorphism.
- a multiple nucleotide polymorphism identification method characterized by detecting using a plurality of types of detection probes.
- a kit for simultaneously identifying a plurality of types of nucleotide polymorphisms contained in a sample comprising at least the following (0 to ( ⁇ ):
- V a detection probe complementary to at least a part of the second oligonucleotide and / or a detection probe complementary to at least a part of the second oligonucleotide and the first oligonucleotide
- a kit for simultaneously identifying a plurality of types of nucleotide polymorphisms contained in a sample comprising at least the following (0 to (vi):
- kits containing a solid phase on which detection probes are pre-fixed are pre-fixed.
- kits characterized in that the solid phase is a DNA microarray.
- nucleotide polymorphism-specifically linked oligonucleotide is detected in a gene-specific manner, so that a plurality of nucleotide polymorphisms can be obtained. It can be easily detected.
- a chromosome containing a specific nucleotide polymorphism site or a fragment thereof contained in a sample is a target nucleic acid containing a nucleotide polymorphism site that carries information on the target gene. If there is, there is no particular limitation.
- the target nucleic acid include Alu sequences, exons, introns and promoters of genes encoding proteins. More specifically, genes related to various diseases including genetic diseases, drug metabolism, lifestyle-related diseases (hypertension, diabetes, etc.) can be mentioned. For example, the ACE gene can be mentioned as hypertension.
- polymorphic nucleic acid of a chromosome or a nucleic acid fragment refers to a wild-type nucleic acid in which at least one nucleotide is point-mutated and replaced with another nucleotide, or one of the wild-type nucleic acids. It is a nucleic acid containing an insertion or deletion sequence in the part. It has been elucidated that the constitution is different depending on such a base polymorphism, and the method of the present invention examines whether or not the nucleic acid in the sample has such an expected polymorphism. Is the method.
- the method for detecting a base polymorphism in the present invention is characterized in that an enzyme containing a nuclease activity and an enzyme containing a ligase activity are used sequentially and Z or simultaneously.
- the activity can be performed by, for example, an enzyme, and an enzyme having both activities can also be used.
- examples of the enzyme having nuclease activity include Mung bean nuclease, S1 nuclease, and exonucleases I to VII.
- Enzymes containing ligase activity include T4DNA
- thermostable enzymes examples include ligase, E. coli DNA ligase, RNA ligase and the like. It is preferable that the enzyme containing nuclease activity and the enzyme containing ligase activity are thermostable enzymes.
- the thermostable enzyme should be derived from Tth, Taq, KOD, Pfo.
- the enzyme having nuclease activity may be a DNA polymerase.
- a heat-resistant DNA polymerase derived from Tth, Taq, KOD, or Pfo may be used.
- a specific embodiment of the method for detecting a base polymorphism of the present invention is a method for identifying a plurality of base polymorphisms contained in a sample
- a first oligonucleotide containing a nucleotide polymorphism sequence portion is prepared, complementary to the strand strand nucleic acid to which the first oligonucleotide hybridizes, and hybridized adjacent to the first oligonucleotide.
- Preparing a second oligonucleotide comprising a sequence in which the polymorphic sequence portion does not form a complementary strand to either of the polymorphic sequences;
- the base pair of the second nucleotide is not formed!
- the base is removed by an enzyme containing nuclease activity.
- the phosphate group remains and the base is removed. That is, a phosphate group is generated for the first time by an enzyme having a nuclease activity, and the first oligonucleotide and the second oligonucleotide are linked by an enzyme having a ligase activity.
- the nucleotide polymorphism of a specific nucleic acid sequence contained in a sample is identified by detecting the linked oligonucleotide.
- the first oligonucleotide is an oligonucleotide containing a base complementary to a predicted sequence portion of the nucleotide polymorphism.
- the portion at which the nucleotide polymorphism is expected is at the 3rd end of the first nucleotide.
- the second oligonucleotide is preferably located on the third side of the first oligonucleotide.
- an oligonucleotide containing a base that is not complementary to the expected sequence portion of the nucleotide polymorphism is preferable.
- the base that is not complementary to the expected sequence portion of the nucleotide polymorphism is at the 5 ′ end of the second oligonucleotide.
- the design method of the first oligonucleotide and the second oligonucleotide will be described.
- the first oligonucleotide and the second oligonucleotide are brought into contact with a target nucleic acid containing an expected sequence portion of the nucleotide polymorphism.
- a target nucleic acid containing an expected sequence portion of the nucleotide polymorphism.
- the 3 'end of the first oligonucleotide is designed to hybridize with the expected sequence of the nucleotide polymorphism, and the 5th end of the second oligonucleotide is predicted to be the nucleotide polymorphism.
- the length that does not hybridize with the expected sequence portion of the nucleotide polymorphism at the 5 ′ end of the second oligonucleotide may be at least one base.
- the enzyme containing ligase activity causes the first and second oligonucleotides to react with each other. Design so that nucleotides can be combined!
- the length of the first oligonucleotide and the second oligonucleotide in the present invention is 13 to 35 bases, preferably 16 to 30 bases.
- the 3 ′ terminal base of the first oligonucleotide is designed to be the expected oligonucleotide of the nucleotide polymorphism site
- the wild-type first oligonucleotide is a base complementary to the base of the wild-type nucleic acid
- the polymorphic first oligonucleotide places a base complementary to the base of the polymorphic nucleic acid.
- the overlapping base of the second oligonucleotide is complementary to both the wild type and the polymorphism. Select something other than the correct base. By selecting bases that are not complementary to both the wild type and polymorphism, only one type of second oligonucleotide needs to be prepared when measuring one type of base polymorphism.
- the second oligonucleotide can be used only in the combination of the wild-type first oligonucleotide Z second oligonucleotide Z wild-type nucleic acid and polymorphic first nucleotide Z second oligonucleotide Z polymorphic nucleic acid. Except for the overlapping portion of nucleotides, the bases that overlap the second oligonucleotide are removed by the enzyme containing the nuclease activity because they match completely. At this time, the phosphate group remains and is removed, so that the first oligonucleotide and the second oligonucleotide are linked together by the action of an enzyme containing ligase activity.
- the 3 'end of the first oligonucleotide is not complementary, so ligase activity is reduced. Ligation by the containing enzyme does not occur.
- the wild-type first oligonucleotide and the polymorphic first oligonucleotide are allowed to act simultaneously.
- the first oligonucleotide and the second oligonucleotide are hybridized to a chromosome or nucleic acid fragment containing a base polymorphism.
- the conditions for performing the ibridization may be the conditions that are normally used. For example, it can be performed according to the method described in Molecular Cloning (issued in 1989).
- the overlapping part of the second oligonucleotide contains the nuclease activity. Cleave with a suitable enzyme.
- the enzyme activity that can be used is as described above.
- an exonuclease such as a DNA polymerase that has an exonuclease activity is preferable.
- the 5 ′ end of the second oligonucleotide overlaps with the first oligonucleotide, use an exonuclease to cleave the overlapping portion of the second oligonucleotide and Make the group protrude.
- the phosphate group protruding to the 5th side of the second oligonucleotide and the first oligonucleotide 3 ′ side are combined with an enzyme having a ligase activity to form one oligonucleotide.
- the site corresponding to the nucleotide polymorphism in the first oligonucleotide is not complementary, the site corresponding to the nucleotide polymorphism is not complementary even when cleaved by endonuclease. Cannot bind to one oligonucleotide.
- an enzyme containing nuclease activity and an enzyme containing ligase activity are used for the sample nucleic acid using a wild-type first oligonucleotide, it reacts with the 1S polymorphism that is single-stranded if the sample nucleic acid is wild-type. Does not happen.
- an enzyme containing nuclease activity and an enzyme containing ligase activity are used for the sample nucleic acid using the polymorphic first oligonucleotide, if the sample nucleic acid is polymorphic, it will be a single strand. The reaction will not occur.
- humans and higher organisms have the ability to have one gene each from the father and one from the mother for each type of gene. It can also be distinguished whether the polymorphism is homo or hetero.
- the present invention also provides a method for causing the measured! /, Multiple types of polymorphisms to act on an enzyme containing a nuclease activity and an enzyme containing a ligase activity in the same reaction system.
- the term “plural types” means that at least one type or two or more types of base polymorphisms are measured.
- the first oligonucleotides for wild type and polymorphism are used. It is preferable to apply a different label to the tide, for example, a fluorescent label capable of distinguishing the fluorescence wavelength. At least the fluorescent labeling for labeling the first oligonucleotide for wild type and polymorphism is different! / If the first oligonucleotide and the second oligonucleotide for identifying multiple types of nucleotide polymorphisms are different You can mix them up.
- the nucleic acid fragment containing the polymorphic sequence may be amplified by the amplification reaction shown below before the above hybridization. Is possible.
- the amplification method is not particularly limited, but PCR (Polymerase
- the enzyme containing nuclease activity and the enzyme containing ligase activity are allowed to act to bind oligonucleotides, and then the bound products are amplified in the amplification reaction described above to enable detection. Is possible.
- a sequence on which the primer used in the amplification reaction acts can be added to the 5 ′ end side of the first oligonucleotide and the 3 ′ end side of the second oligonucleotide.
- the linked oligonucleotide obtained by the above reaction is detected as follows using a detection probe.
- nucleotide having oligotin, linker arm, fluorescent substance, or oligo dGTP, oligo dATP, oligo dTTP, oligo dCTP, etc. may be added to the terminal at the end of the synthesis to introduce a modifying group.
- nucleotides with piotin, linker arm, fluorescent substance, etc. instead of nucleotides in the tide sequence, substitution may be carried out by synthesis and introduction of a modifying group.
- Labels of known oligonucleotides such as radioactive substances such as 32 P and 35 S, synthesized enzymes such as ALP and POD, and fluorescent substances such as FITC, HEX, 6-FAM, and TET. May be introduced.
- different oligonucleotide sequences may be added to the wild-type first oligonucleotide and the nucleotide polymorphism first oligonucleotide, respectively.
- a first oligonucleotide labeled with a fluorescent substance or the like and a second nucleic acid are hybridized with a specific nucleic acid, and an enzyme having a ligase activity and an enzyme having a nuclease activity are sequentially and Z or simultaneously acting, then dissociated, hybridized with polymorphism-specific detection probe and wild-type detection probe bound to the solid phase, and washing the hybridized forceful nucleic acid
- it is detected whether or not it is hybridized by labeling the first oligonucleotide of the nucleic acid hybridized with each detection probe, and the base polymorphism is wild type or polymorphic or mixed depending on the detection signal ratio of each detection probe
- detection of wild-type and polymorphism can be performed by adding a mixed base to the sequence of the base polymorphism part. It can also be performed with the single detection probe used.
- a different label for example, a fluorescent label capable of distinguishing the fluorescence wavelength, is added to the wild-type and polymorphic first oligonucleotides so that a plurality of types of polymorphisms can be simultaneously activated in at least one reaction system.
- An enzyme containing ligase and an enzyme containing ligase activity may be allowed to act.
- the first oligonucleotide and the second oligonucleotide for identifying multiple types of base polymorphisms May be mixed.
- the fluorescent label for labeling the first oligonucleotide for the wild type and the polymorph it is more preferable if the fluorescence wavelengths can be distinguished, and it is more preferable to use fluorescent dyes having different colors.
- the wild-type first oligonucleotide may be labeled with Cy3 at the end and Cy5 with the polymorphic first oligonucleotide at Cy5, and vice versa. .
- the target nucleic acid is a polymorphic nucleic acid, and the 5 'end is modified with Cy3.
- the case where the prepared wild-type first oligonucleotide and the polymorphic first oligonucleotide whose 5 ′ end is modified with Cy5 is used is shown.
- the second oligonucleotide is set with the “probable sequence portion of the nucleotide polymorphism” at the 5th end thereof, and complemented with the “sequence portion of the nucleotide polymorphism expected”.
- the wrong base is set.
- the bases located at the 5th and the end of the second oligonucleotide should be set as non-complementary bases even when the target nucleic acid is a wild type.
- the polymorphic first oligonucleotide is designed so that the A at the end and the G at the 5 'end of the second oligonucleotide overlap.
- it is designed so that the 3, terminal C of the wild type first oligonucleotide overlaps the 5, 5 terminal G of the second oligonucleotide.
- Fig. 1 (1) shows a case in which the polymorphic first oligonucleotide and the second oligonucleotide act on the polymorphic nucleic acid.
- a at the 3rd end of the first polymorphic oligonucleotide is hybridized to the polymorphic site, and 5th from the 5th end of the second oligonucleotide is hybridized to the adjacent site.
- G at the 5th end of the second oligonucleotide is not complementary because it is not complementary to the polymorphic site.
- the enzyme at the end of the second oligonucleotide is cleaved by the action of an enzyme containing nuclease activity, and a phosphate group is generated.
- an enzyme containing ligase activity acts to link two oligonucleotides.
- Fig. 1 (2) shows a case where a wild-type first oligonucleotide and a second oligonucleotide act on a polymorphic nucleic acid.
- the third end of the wild-type first oligonucleotide is non-complementary to the polymorphic site, so it should be neutralized.
- the G at the 5 'end of the second oligonucleotide is not complementary because it is not complementary to the polymorphic site.
- an enzyme containing nuclease activity cannot cleave the 5th and 5nd ends of the second oligonucleotide. Therefore, an enzyme containing ligase activity cannot act and the two oligonucleotides are not linked.
- the target nucleic acid is a wild-type nucleic acid
- the result is opposite to that in FIG. 1, and the polymorphic first oligonucleotide and the second oligonucleotide are not linked, and the wild-type first oligonucleotide and A second oligonucleotide is linked.
- the target nucleic acid is a homologue of only the polymorphic nucleic acid
- only the linked polymorphic first oligonucleotide and second oligonucleotide are obtained, and the target nucleic acid is only the wild-type nucleic acid.
- a 1: 1 mixture will be obtained.
- FIG. 1 illustrates the case of one type of base polymorphism for easy explanation.
- the present invention provides a method for measuring at least one type or two or more types of base polymorphisms.
- at least the fluorescent labels for labeling the first oligonucleotide for wild type and for the polymorphism are different! / If there is a difference, the first oligonucleotide and the second oligonucleotide for identifying multiple types of nucleotide polymorphisms
- An oligonucleotide may be mixed and an enzyme containing nuclease activity and an enzyme containing ligase activity may be allowed to act in the same reaction system.
- an enzyme containing nuclease activity and an enzyme containing ligase activity may be allowed to act in the same reaction system.
- a solid phase in which multiple types of detection probes for detecting these nucleotide polymorphisms are immobilized without crossing each type is used. This is possible.
- the enzyme containing nuclease activity and the enzyme containing ligase activity a DNA microarray with the above detection oligonucleotides immobilized May be used. Advantages of using DNA microarrays Considering cost and ease of operation, it is advantageous.
- the present invention also provides a detection system using a DNA microarray that is convenient and advantageous in terms of cost.
- the detection probe used in the present invention requires a base sequence that includes a nucleotide polymorphism part, and preferably has a strength of at least 15 consecutive bases, more preferably at least 18 consecutive bases.
- those containing a sequence complementary to a part of the second oligonucleotide, or those containing a sequence complementary to a part of the first oligonucleotide and a part of the second oligonucleotide are good.
- the detection probe can be prepared by chemical synthesis or biological methods using DNA, RNA, or PNA as long as it forms a complementary strand with a specific nucleic acid sequence.
- D of Perkin Elma It can be synthesized by phosphoramidite method using NA synthesizer type 391. Purification may be carried out with FPL C on a MONO-Q column or reverse phase column.
- Other synthesis methods include the phosphoric acid triester method, the H-phosphonate method, and the thiophosphite method.
- the polymorphic sequence portion of the detection probe may be a mixed base.
- the mixed base means a base including a base complementary to either the wild type or the polymorphic force.
- the polymorphic sequence portion may be a base of T or G.
- a specific adjustment method will be described with an example. It can be synthesized by mixing T and G at the time of synthesis by the phosphoramidite method or the like.
- the ratio of the bases in the detection probe varies depending on the synthesis ratio of mixing, but the ratio can be selected if a desired signal is obtained. Preferably, 1: 1 is good.
- the case where the wild type is C and the polymorphism is A has been described as an example. However, when there are multiple polymorphisms, there may be more than three types of mixed bases.
- a DNA microarray using the detection probe to be used in the present invention an existing method may be used.
- Known methods for producing a DNA microarray include a method of directly synthesizing a probe on the surface of a solid support (on-chip method) and a method of fixing a probe prepared in advance on the surface of a solid substrate.
- the DNA microarray is preferably prepared by the latter method.
- a probe having a functional group introduced therein is synthesized, and the probe is spotted on the surface of the solid phase substrate that has been surface-treated and covalently bonded (for example, Lamture,
- a probe is covalently bonded to a surface-treated solid phase substrate via a spacer or a crosslinker.
- a method of aligning a small piece of polyacrylamide gel on a glass surface and covalently binding a probe to it (Yershov,
- the DNA microarray of the present invention can be produced by any of the above methods.
- spotting when spotting is performed by dropping a probe onto the surface of a solid phase substrate, it can be performed by a pin method, or an ink disclosed in JP-A-2001-116750 or JP-A-2001-186881. It is also possible to adopt a jet method. After spotting, each spot is fixed on a solid phase substrate by cooling, adding moisture to the spot (humidity is kept at about 80% for a certain period of time), immobilizing treatment by baking and drying, etc. Can be completed.
- the solid phase substrate of the DNA microarray can be obtained by using plastic, silicone, ceramic, etc., in addition to the glass (slide glass) used for ordinary DNA microarrays.
- the DNA microarray provided by the present invention and the first and second oligonucleotides linked by ligase are at least about 26 to 70 bases, the reactivity with the detection probe is good on the DNA microarray. Has the feature that it can be easily operated
- a first oligonucleotide for wild type in order to identify a single-base polymorphism, a first oligonucleotide for wild type, a first oligonucleotide for polymorphism labeled with fluorescent substances having different fluorescence wavelengths, and a second oligonucleotide are used. If one type of nucleotide is prepared for each, it is sufficient to prepare at least one type of detection probe containing a mixed base. Therefore, the present invention is far superior to the conventional method in simultaneously measuring a plurality of types of polymorphs.
- the present invention can greatly contribute to speeding up, efficiency, etc. in the industrial field of those skilled in the art.
- the detection probe on the DNA microarray for detection removes the base sequence that does not form a base pair that occurs in the sequence portion of the base polymorphism when each oligonucleotide is hybridized, and then acts on the ligase activity. It has the characteristic that it can detect the binding substance of the 1st oligonucleotide and 2nd oligonucleotide couple
- the first and second oligonucleotides may be labeled in advance with an enzyme, piotin, a fluorescent substance, a hapten, an antigen, an antibody, a radioactive substance, a luminophore, or the like as described above.
- Table 1 shows the genes to be measured and SNP sites.
- an oligonucleotide having the base sequence shown in SEQ ID NOs: 1 to 30 (see Table 2) (hereinafter sometimes abbreviated as Oligo 1 to 30) is a DNA synthesis contractor. (Japan Bioservice Co., Ltd., Saddy Co., Ltd., GENSET)
- Oligo 16-20 is separately mixed 1: 1 with the spot solution (Matsunami Glass Industrial Co., Ltd .: DSP0050).
- the mixed oligonucleotide solution is spotted on a slide glass for DNA microarray (Matsunami Glass Industrial Co., Ltd .: SDA0011). Put it in a wet box and leave it overnight. After drying, lightly wash with water and leave overnight in 1% BSA aqueous solution. Lightly wash with water twice, then centrifuge (2000 rpm, 2 minutes) and dry.
- first and second oligonucleotides are hybridized with a specific nucleic acid, ligase activity and nuclease activity are allowed to act sequentially and Z or simultaneously, and then the presence or absence of the linked first and second oligonucleotides is determined.
- the present invention provides a method for determining a sequence portion of a nucleotide polymorphism by detecting an array to which a detection probe is bound. The nuclease activity causes the phosphate group to protrude from the 5th and the 5th ends of the second oligonucleotide, thus eliminating the reaction of binding the phosphate group when preparing the oligonucleotide.
- the present invention also provides a method in which several nucleotide polymorphisms simultaneously act on nuclease activity and ligase activity in at least one reaction system. Furthermore, since the first and second oligonucleotides ligated with ligase are at least about 26 to 70 bases, they have a feature that they can be easily manipulated on an array having good reactivity with the detection probe. According to the present invention, since a plurality of nucleotide polymorphisms can be easily detected, it is expected to greatly contribute to the industry.
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WO1997031256A2 (en) * | 1996-02-09 | 1997-08-28 | Cornell Research Foundation, Inc. | Detection of nucleic acid sequence differences using the ligase detection reaction with addressable arrays |
WO2000056927A2 (en) * | 1999-03-19 | 2000-09-28 | Cornell Research Foundation, Inc. | Detection of nucleic acid sequence differences using the ligase detection reaction with addressable arrays |
WO2002002815A1 (fr) * | 2000-07-05 | 2002-01-10 | Toyo Boseki Kabushiki Kaisha | Procede de detection de polymorphismes nucleotidiques |
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CN1197976C (zh) * | 2003-01-31 | 2005-04-20 | 中国人民解放军南京军区联勤部军事医学研究所 | 基因多态性检测方法 |
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WO1997031256A2 (en) * | 1996-02-09 | 1997-08-28 | Cornell Research Foundation, Inc. | Detection of nucleic acid sequence differences using the ligase detection reaction with addressable arrays |
WO2000056927A2 (en) * | 1999-03-19 | 2000-09-28 | Cornell Research Foundation, Inc. | Detection of nucleic acid sequence differences using the ligase detection reaction with addressable arrays |
WO2002002815A1 (fr) * | 2000-07-05 | 2002-01-10 | Toyo Boseki Kabushiki Kaisha | Procede de detection de polymorphismes nucleotidiques |
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