JP2011004733A - Microarray for detecting target nucleic acid in a plurality of specimens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for quickly and readily analyzing a plurality of specimens while reducing an inspection cost per specimen.SOLUTION: The microarray for detecting the target nucleic acid in the plurality of specimens has a probe region on which probes having a sequence complementary to a tag sequence for identifying the specimen, and a sequence complementary to the target sequence contained in the specimen are immobilized.

Description

The present invention relates to nucleic acid analysis means .

DNA chip, 10 to 10 ⁵ different DNA nucleic acid strands in each of the slide glass or silicon substrate few cm is immobilized device as probes. When a sample is analyzed using a DNA chip, the contained nucleic acid is first labeled with a fluorescent dye or a radioisotope, and then reacted with a probe on the chip. Hybridization occurs if the nucleic acid in the sample contains a nucleic acid complementary to the probe on the chip. The arrangement and fixing position of the probe fixed on the chip are clear. Therefore, by specifying the position on the chip where the signal derived from the label is obtained, the sequence of the nucleic acid contained in the sample can be determined (Non-Patent Document 1). The DNA chip is a very useful device (testing instrument) for analyzing many genes at one time for one sample. Usually, one chip is used for one sample. When looking at the difference in the expression level of two samples, two chips are used on one chip.

  On the other hand, for example, in the field of infectious diseases, the number of genes examined is small, but the number of specimens may be large. However, conventionally, since it is necessary to use a large number of chips according to the number of specimens, the inspection cost including the chip, labor, and time is high.

Pease et al. Proc Natl Acac Sci U S A. 1994, 91, 5022-5026

In view of the above circumstances, an object of the present invention is to provide a means for reducing a test cost per specimen and analyzing a plurality of specimens quickly and easily.

In order to achieve the above object, the present invention provides:
A target in a plurality of samples characterized by having a probe region in which a probe having a sequence complementary to a tag sequence for identifying a sample and a sequence complementary to a target sequence contained in the sample is immobilized A microarray for detecting nucleic acids .

According to the method of the present invention, since a plurality of specimens can be examined with a single chip, a means for analyzing a plurality of specimens quickly and simply is provided with a low cost of examination per specimen.

The figure which shows a tag arrangement | sequence introduction primer and a nucleic acid probe. The scheme figure which shows an amplification process. The figure which shows a detection process. The scheme figure which shows an amplification process. The figure which shows a primer. The figure which shows the intermediate product of LAMP amplification. The scheme figure which shows an amplification process. The figure which shows a detection process. The figure which shows a primer. The scheme figure which shows an amplification process. The top view of a DNA chip. The top view of a DNA chip. The figure which shows the result of having cleaved the amplification product by the restriction enzyme treatment. The figure which shows the result of having detected multiple samples. The figure which shows the result of having detected multiple samples. The figure which shows the result of having detected multiple samples.

[Definition]
As used herein, the term “nucleic acid” is a generic term for substances capable of representing a part of their structure by nucleotide sequence, such as DNA, RNA, PNA, LNA, S-oligo, and methylphosphonate oligo. It is shown.

  The “specimen” is a target to be subjected to the analysis method according to the present invention, and may be any sample that may contain a nucleic acid. The specimen is preferably in a state that does not interfere with the amplification reaction and / or the hybridization reaction. For example, in order to use a material obtained from a living body or the like as a specimen according to the present invention, pretreatment may be performed by any means known per se. For example, the specimen may be a liquid, in which case it may be referred to as a “test liquid”. Therefore, the “test solution” may be understood as a solution in which a nucleic acid or a template nucleic acid may exist.

  The terms “multiple samples” and “plural samples” refer to two or more samples and can be used interchangeably.

  The nucleic acid contained in the sample is referred to as “sample nucleic acid”. Among the sample nucleic acids, the sequence to be amplified by the primer according to the present invention is referred to as “template sequence”. A nucleic acid containing a template sequence is referred to as a “template nucleic acid” or “template”. A partial sequence contained in the template nucleic acid is referred to as a “partial nucleic acid sequence”. The partial nucleic acid sequence is the sequence or base to be analyzed, and the primer according to the present invention is designed to amplify the region containing the partial nucleic acid sequence. The partial nucleic acid sequence may be equal to or included in the template sequence.

  “Target nucleic acid” refers to an amplification product obtained by amplifying a template nucleic acid or a template sequence using a forward primer and a reverse primer according to the present invention. The target nucleic acid includes a target sequence in a part thereof.

  The “target sequence” consists of a tag sequence and a partial sequence of the template sequence. The target sequence is used to detect a target nucleic acid using a nucleic acid probe.

  A “nucleic acid probe” is a nucleic acid containing a sequence complementary to a target sequence. The nucleic acid probe is used by being immobilized on a solid phase such as a substrate and forms a hybrid with an amplification product containing a region derived from the template sequence.

  The “region derived from the template sequence” means a region in which the template sequence is reflected in a region other than the region to which the primer binds among the regions amplified by the primer. When detecting gene polymorphisms or gene mutations, the sites are designed to fit within this region.

  A “DNA chip” is an apparatus that analyzes a nucleic acid using a hybridization reaction between a nucleic acid probe having a sequence complementary to the nucleic acid to be detected and the nucleic acid to be detected. The term DNA chip is synonymous with commonly used terms such as “nucleic acid chip”, “microarray” and “DNA array”, and is used interchangeably.

  “Analyze multiple specimens” refers to analyzing a plurality of specimens simultaneously. “Analyzing a plurality of nucleic acid sequences in a specimen” refers to simultaneously analyzing a plurality of partial nucleic acid sequences contained in one specimen. A plurality of partial nucleic acid sequences to be analyzed simultaneously may be included in one template nucleic acid, or may be included in different types of sample nucleic acids included in the sample.

  The analyzed items include, for example, detection of specific nucleic acids such as genes derived from viruses and / or bacteria, measurement of gene expression levels, identification of genotypes for polymorphisms and / or detection of the presence or absence of mutations. And so on. However, the present invention is not limited to this.

[Implementation]
Hereinafter, embodiments of the present invention will be described.

  FIG. 1 is a diagram showing a tag sequence introduction primer and a nucleic acid probe.

<Primer>
As exemplified by the tag introduction F primer in FIG. 1, a sequence that binds to the primer binding site of the template nucleic acid and a tag sequence for analyzing multiple samples are introduced into the primer.

Different tag sequences are used depending on the specimen. For example, in the case of preparing a tag sequence 5 bases, and A, T, C, when composed of four bases G, the tag sequence of 4 ⁵ next 1024 are candidates. However, when a tag sequence having a difference of one base is used, there is a high risk of mismatch hybridization, and therefore, tag sequences having different sequences of two or more bases are preferably prepared. The number of tag sequences to be prepared may be as many as the number of samples constituting the sample group to be analyzed at a time. Thereby, it is possible to identify all the samples constituting the sample group.

  The tag sequence is designed such that when the primer containing it binds to the template nucleic acid, the tag sequence portion does not bind to the template nucleic acid and loops out. The length of the tag sequence may be within a range that allows loop-out and that includes a primer that can amplify the template nucleic acid. Although not limited thereto, it may be 20 bases or less, preferably 10 bases or less. For example, what is necessary is just 1-20 bases, 2-20 bases, 1-10 bases, and 2-10 bases.

  The length of the primer may be 13-40 bases, for example 15-30 bases.

  The place where the tag sequence is inserted into the primer may be at least one base from the 3 'end of the primer, but the primer must loop out of the tag sequence and bind to the template. It is preferable that the position is 3 bases or more from the 3 ′ end. Further, as shown in FIG. 1, when detecting a polymorphism such as a mutation or a single nucleotide polymorphism, the nucleic acid probe needs to contain both a tag sequence and a sequence derived from the template sequence. In this case, if the insertion site is positioned on the 5 'end side, the probe becomes longer and the specificity is lowered. From this, the insertion site is preferably closer to the 3 'end as long as the primer can be amplified by looping out, and is within 25 bases, more preferably within 15 bases from the 3' end.

  When PCR is used as an amplification method, the primer into which the tag sequence to be used is introduced may be either a Forward primer (F primer) or a Reverse primer (R primer). A tag sequence may be introduced.

  When the LAMP method is used as an amplification method, a primer in which the tag sequence is introduced into the F2 region and / or the B2 region is prepared.

  The type of nucleic acid constituting the tag sequence is not particularly limited as long as it is a substance capable of representing a partial structure by a base sequence, such as DNA, RNA, PNA, LNA, S-oligo, and methylphosphonate oligo.

<Nucleic acid probe>
The nucleic acid probe is designed to include a sequence complementary to the tag sequence in order to detect the tag sequence contained in the target nucleic acid. Furthermore, as shown in FIG. 1, it is designed to include a sequence complementary to a region derived from the template sequence.

  For example, when detecting gene mutation and / or polymorphism of a nucleic acid in a specimen, the gene mutation and / or gene polymorphism site is located in a region derived from the template sequence near the primer binding site. A wild type detection nucleic acid probe and a wild type detection nucleic acid probe, each having a tag sequence detection sequence and a gene mutation and / or polymorphism detection sequence, are used. The target genotype can be determined by comparing the amount of hybridization between the target nucleic acid and the nucleic acid probe for detecting the mutant type and the target nucleic acid.

  In addition, when identifying a plurality of species classified into the same genus of bacteria, for example, the tag introduction primer that amplifies in common with the genus is prepared for each specimen and amplified. At this time, a region characteristic of each species and specific to other species is located in a region derived from the template sequence in the vicinity of the primer binding site. The amount of hybridization between the nucleic acid probe for identifying the species and the target nucleic acid having the sequence for detecting the tag sequence, the sequence characteristic to each species, and the nucleic acid probe for the negative control indicating the sequence unrelated to the species and the target nucleic acid The species can be identified by comparing.

  As an index for analysis, when detecting the presence or absence of amplification of a nucleic acid in a specimen, a sequence complementary to a region derived from a template sequence is included.

  The chain length of the nucleic acid probe according to the present invention is not particularly limited, but is preferably in the range of 5 to 50 bases, more preferably in the range of 10 to 40 bases, and still more preferably in the range of 15 to 35 bases.

  The nucleic acid probe may be modified with a reactive functional group such as an amino group, a carboxyl group, a hydrosyl group, a thiol group or a sulfone group, or a substance such as avidin or biotin in order to be immobilized on the substrate. It is also possible to introduce a spacer between the functional group and the nucleotide. As the spacer, for example, an alkane skeleton, an ethylene glycol skeleton or the like may be used.

  The solid phase for immobilizing the nucleic acid probe may be any substrate generally used as a solid phase for a DNA chip. Such a substrate may be composed of glass, silicon, nitrocellulose film, nylon film, microtiter plate, electrode, magnet, bead, plastic, latex, synthetic resin, natural resin, or optical fiber, but is not limited thereto. Not. A DNA chip may be constructed by immobilizing a plurality of types of nucleic acid probes on these substrates.

<Method>
Next, a method for analyzing multiple samples using a primer into which a tag sequence has been introduced and a DNA chip will be described.

  As shown in FIG. 2, first, primers (sample 1 primer, sample sequence 1, tag 2 and tag 3) introduced with tag sequences (tag sequence 1, tag sequence 2, tag sequence 3) having different sequences for each sample (sample 1, sample 2, sample 3). (Sample 2 primer, Sample 3 primer) are prepared, and amplification is performed in an independent reaction system for each sample. The reaction system independent for each sample may be a reaction system in which each sample does not mix. For example, amplification may be performed in a separate tube for each specimen. The “reaction system” refers to a space in which a reaction is performed, and may be a container such as a tube and a well, for example.

  After amplification, amplification products whose partial sequences differ depending on the specimen are obtained. When the template nucleic acid does not exist (specimen 2), amplification does not occur and an amplification product is not obtained. The amplification product obtained in each reaction system includes a tag sequence and a region derived from the template nucleic acid that are different for each sample (sample 1, sample 3). Therefore, it is possible to specify the specimen by identifying the tag sequence contained in the amplification product.

  This amplified product is mixed and hybridized with a nucleic acid probe containing a sequence complementary to each tag sequence immobilized on a substrate as shown in FIG. Thereafter, hybridization between the amplification product and the nucleic acid probe is detected by an appropriate detection method.

  Although FIG. 2 and FIG. 3 show examples using three samples, it is clear that the number of samples is not limited to this. In addition, as shown in FIG. 1, if a primer is designed so that a mutation or polymorphic site is located in a region derived from the template sequence of the amplification product, the tag sequence and these mutations and / or polymorphisms are detected or identified. Mutation and / or polymorphism analysis can be performed by using a nucleic acid probe having a sequence and containing a sequence derived from a template sequence.

  Furthermore, as shown in FIG. 4, it is also possible to multi-amplify a plurality of template sequences having different sequences within one reaction system. After amplification, a plurality of template sequences can be detected by detecting the DNA chip on the amplification product of the specimen. Detection is performed by hybridization with a nucleic acid probe containing a sequence complementary to each tag sequence immobilized on the substrate. Thereafter, hybridization between the amplification product and the nucleic acid probe is detected by an appropriate detection method. Although FIG. 4 shows an example of three template sequences, it is clear that the number of template nucleic acids is not limited to this. In addition, if a primer is designed in the region derived from the template sequence of the amplification product so that a site characteristic of the species to be mutated, polymorphic and / or identified and specific to other species can be located, the tag sequence and By using a nucleic acid probe containing a sequence derived from a template sequence having a sequence for detecting or identifying a site characteristic of these mutations, polymorphisms and / or species, mutations, polymorphisms, species, etc. Can be analyzed.

  The detection target in the present invention includes, for example, individual genomic DNA, genomic RNA, mRNA and the like. Individuals include, but are not limited to, humans, non-human animals, plants, and microorganisms such as viruses, bacteria, bacteria, yeasts and mycoplasmas.

  These nucleic acids are extracted from samples collected from individuals, such as blood, serum, leukocytes, urine, stool, semen, saliva, tissue, biopsy, oral mucosa, cultured cells, sputum and the like. Alternatively, it is extracted directly from the microorganism. Nucleic acid extraction can be performed using, but not limited to, commercially available nucleic acid extraction kits such as QIAamp (manufactured by QIAGEN), Sumitest (manufactured by Sumitomo Metals), and the like. A solution containing nucleic acid extracted from an individual sample or a microorganism is used as a test solution.

  The specimen is amplified by the amplification method according to the method of the present invention. When the detection target is RNA, it can be converted into complementary strand DNA by, for example, reverse transcriptase before amplification. Both reverse transcriptase and DNA polymerase may be added in the same tube, and reverse transcription and DNA amplification may be performed simultaneously.

  Examples of the amplification method include Polymerase chain reaction method (PCR method), Loop mediated isothermal amplification method (LAMP method), Isothermal and chimeric primer-initiated amplification of nucleic acids (ICAN method), Nucleic acid sequence-based amplification method (NASBA). Method), Strand displacement amplification (SDA method), Ligase chain reaction (LCR method), Rolling Circle Amplification method (RCA method), etc. can be used. The obtained amplification product is fragmented or single-stranded as necessary. Examples of means for forming a single strand include heat denaturation, a method using beads and enzymes, and a method of performing a transcription reaction using T7 RNA polymerase. When amplified by the LAMP method, ICAN method or the like and a single-stranded region is present in the product and this single-stranded region is used as a target sequence, it can be directly subjected to a hybridization step.

  Since this single-stranded step is not necessary, the target nucleic acid obtained by amplification preferably has a stem-loop structure. The amplification product having a stem-loop structure can conveniently use the sequence of the single-stranded loop portion for the reaction with the probe.

  For amplification of the target nucleic acid, the LAMP method (see, for example, Japanese Patent No. 3313358) is preferably used. The LAMP method is a rapid and simple gene amplification method, and the amplification product has a stem-loop structure.

  FIG. 5 is a diagram showing an example of basic primer design used in the LAMP method. The principle of the LAMP method will be briefly described with reference to the schematic diagram of FIG. In the LAMP method, six types of primers that recognize a maximum of eight regions of a template nucleic acid and a strand displacement type DNA synthase are used. The template nucleic acid is amplified under isothermal (60-65 ° C.) conditions. The eight regions are defined as F3 region, F2 region, LF region, F1 region, B3c region, B2c region, LBc region, and B1c region in this order from the 5 'end side of the template nucleic acid. The F1c, F2c, F3c, B1, B2, and B3 regions indicate regions in the complementary strands of the F1, F2, F3, B1c, B2c, and B3c regions, respectively. The eight types of primers shown in FIG. 5 have a FIP inner primer having a sequence complementary to F1 on the 5 ′ end side and the same sequence as F2 on the 3 ′ end side, and the same sequence as B1c on the 5 ′ end side. 'BIP inner primer with sequence complementary to B2c on the terminal side, F3 primer with the same sequence as F3 region, B3 primer with sequence complementary to B3c region, LFc primer with sequence complementary to LF region, LBc primer having the same sequence as the LBc region. Indispensable for the amplification reaction are the FIP inner primer and the BIP inner primer, and the F3 primer, B3 primer, LF primer and LB primer are added to increase the amplification efficiency.

  A loop structure as shown in Fig. 6 is formed in the amplified product by the LAMP method, between F2 region and F1 region, between F2c region and F1c region, between B2 region and B1 region, and between B2c region and B1c region. Is a single-stranded region. Therefore, if a target sequence is designed in this region, the target nucleic acid can be detected easily and with high sensitivity (see, for example, JP-A-2005-143492). When the target sequence overlaps with the LF primer and / or LB primer, it is preferable not to add the LF primer and / or LB primer.

  A multi-sample analysis method using a tag sequence introduction primer and a DNA chip when the LAMP method is used will be described with reference to FIG.

  First, a primer having the tag sequence introduced into the F2 region and / or B2 region is prepared for each sample.

  Next, amplification is performed for each specimen in a reaction system independent for each specimen using the primer. For example, amplification may be performed in a separate tube for each specimen. After amplification, amplification products having partial sequences that differ depending on the specimen are obtained in the single-stranded loop portion. If no template nucleic acid is present, amplification does not occur and no amplification product is obtained. This amplified product is mixed and hybridized with a nucleic acid probe containing a sequence complementary to each tag sequence immobilized on a substrate as shown in FIG. Thereafter, hybridization between the amplification product and the nucleic acid probe is detected by an appropriate detection method.

  Although FIG. 7 and FIG. 8 show examples using three samples, it is clear that the number of samples is not limited to this.

  In addition, as shown in FIG. 9, the region derived from the template sequence detected by the nucleic acid probe, that is, between the F2 region and the F1 region, between the F2c region and the F1c region, between the B2 region and the B1 region, and between the B2c region and the B1c region. If mutations or polymorphic sites are located between them, detection can be performed by using a nucleic acid probe that detects these mutations or polymorphisms.

  Furthermore, as shown in FIG. 10, it is possible to multi-amplify a plurality of types of template sequences having different sequences within one reaction system. After amplification, if a DNA chip is detected for the amplification product of the specimen, it is possible to analyze a plurality of specimens for a plurality of target sequences. Detection is performed by hybridization with a nucleic acid probe containing a sequence complementary to each tag sequence immobilized on the substrate. Thereafter, hybridization between the amplification product and the nucleic acid probe is detected by an appropriate detection method. FIG. 10 shows an example of three template nucleic acids, but it is clear that the number of template nucleic acids is not limited to this. In addition, if a primer is designed in the region derived from the template sequence of the amplification product so that a mutation or polymorphic site, and / or a site characteristic of the species to be identified and specific to other species can be located, the tag sequence And analysis of mutations, polymorphisms, biological species, etc. by using nucleic acid probes comprising sequences derived from template sequences having sequences for detecting or identifying these mutations, polymorphisms and / or biological species It can be carried out.

<DNA chip>
The DNA chip used in the present invention may be provided with a substrate and a nucleic acid probe immobilized on the substrate. The substrate of the DNA chip may be any conventionally known microarray substrate such as an electrochemical detection type represented by a current detection type, a fluorescence detection type, a chemical color development type, and a radioactivity detection type.

  Any kind of microarray can be produced by a method known per se. For example, in the case of a current detection type microarray, the negative control probe immobilization region and the detection probe immobilization region may be arranged on different electrodes.

  An example of a DNA chip is shown in FIG. 11 as a schematic diagram, but is not limited thereto. The DNA chip has an immobilization region 2 on a substrate 1. The nucleic acid probe is immobilized on the immobilization region 2. Such a DNA chip can be manufactured by a method well known in the art. A person skilled in the art can appropriately change the design of the number and the arrangement of the immobilization regions 2 arranged on the substrate 1 as necessary. Such a DNA chip may be suitably used for a detection method using fluorescence.

  Another example of the DNA chip is shown in FIG. The DNA chip of FIG. 12 includes an electrode 12 on a base 11. The nucleic acid probe is immobilized on the electrode 12. The electrode 12 is connected to the pad 13. Electrical information from the electrode 12 is acquired via the pad 13. Such a DNA chip can be manufactured by a method well known in the art. A person skilled in the art can appropriately change the design of the number and arrangement of the electrodes 12 arranged on the substrate 11 as necessary. Furthermore, the DNA chip of this example may include a reference electrode and a counter electrode as necessary.

  The electrode is composed of a simple metal such as gold, gold alloy, silver, platinum, mercury, nickel, palladium, silicon, germanium, gallium or tungsten, or an alloy thereof, or carbon such as graphite or glassy carbon, or a material thereof. Although an oxide or a compound can be used, it is not limited to them.

  The DNA chip as in this example may be suitably used for an electrochemical detection method.

<Hybridization conditions>
Hybridization may be performed under appropriate conditions that allow sufficient hybridization. Appropriate conditions vary depending on the type and structure of the target nucleic acid, the type of base contained in the target sequence, and the type of nucleic acid probe. For example, hybridization may be performed in a buffer solution having an ionic strength in the range of 0.01 to 5 and a pH in the range of 5 to 9. The reaction temperature may range from 10 ° C to 90 ° C. The reaction efficiency may be increased by stirring or shaking. In the reaction solution, a hybridization accelerator such as dextran sulfate, salmon sperm DNA, and bovine thymus DNA, EDTA, or a surfactant may be added.

<Cleaning conditions>
A washing solution for washing the DNA chip after hybridization has an ionic strength in the range of 0.01 to 5, and a buffer solution in the range of pH 5 to 9 is preferably used. The cleaning liquid preferably contains a salt and a surfactant. For example, an SSC solution, Tris-HCl solution, Tween 20 solution, or SDS solution prepared using sodium chloride or sodium citrate is preferably used. The washing temperature is, for example, in the range of 10 ° C to 70 ° C. The washing solution passes or stays on the surface of the probe-immobilized substrate or the region where the nucleic acid probe is immobilized. Alternatively, the DNA chip may be immersed in a cleaning solution. In this case, the cleaning liquid is preferably stored in a temperature-controllable container.

<Detection method>
The detection of the hybrid produced by the hybridization process can utilize a fluorescence detection method and an electrochemical detection method.

(a) Fluorescence detection method Detection is performed using a fluorescent labeling substance. Primers used in the nucleic acid amplification step may be labeled with a fluorescently active substance such as a fluorescent dye such as FITC, Cy3, Cy5, or rhodamine. Alternatively, a second probe labeled with these substances may be used. A plurality of labeling substances may be used simultaneously. The detection device detects the labeled sequence or the label in the secondary probe. Use an appropriate detection device depending on the label used. For example, when a fluorescent substance is used as a label, it is detected using a fluorescence detector.

(b) Electrochemical detection method A double-stranded recognition substance well known in the art is used. The double-stranded recognition substance may be selected from Hoechst 33258, acridine orange, quinacrine, dounomycin, metallointercalator, bisintercalator such as bisacridine, trisintercalator and polyintercalator. Further, these double strand recognition substances may be modified with an electrochemically active metal complex such as ferrocene or viologen.

  Although the double-stranded recognition substance varies depending on the type, it is generally used at a concentration in the range of 1 ng / mL to 1 mg / mL. In this case, a buffer solution having an ionic strength in the range of 0.001 to 5 and a pH in the range of 5 to 10 can be used.

  In the measurement, for example, a potential equal to or higher than the potential at which the double-stranded recognition substance reacts electrochemically is applied, and the reaction current value derived from the double-stranded recognition substance is measured. At this time, the potential may be applied at a constant speed, may be applied in pulses, or a constant potential may be applied. The current and voltage may be controlled using devices such as a potentiostat, a digital multimeter, and a function generator. Electrochemical detection can be performed by methods well known in the art. For example, the method described in JP-A-10-146183 can be used.

[Assay Kit]
The present invention also provides an assay kit for use in the nucleic acid analysis method described above. Such an assay kit is
A tag sequence having a different sequence for each specimen, wherein the tag sequence is designed to loop out when hybridized to a template sequence in a template nucleic acid for each specimen; A primer set comprising a second primer used in pairs and a primer; and a DNA chip comprising a substrate and a nucleic acid probe complementary to a target sequence comprising the tag sequence immobilized on the substrate;
What is necessary is just to comprise.

  In this case, the nucleic acid probe may be a nucleic acid probe complementary to a target sequence including a tag sequence and at least a part of a sequence derived from a template sequence in a specimen.

The assay kit is
A tag sequence having a different sequence for each nucleic acid partial sequence, wherein the tag sequence is designed to loop out when hybridized to a template sequence for each nucleic acid partial sequence; A primer set comprising a second primer used in pairs and a primer; and a DNA chip comprising a substrate and a nucleic acid probe complementary to a target sequence comprising the tag sequence immobilized on the substrate;
What is necessary is just to comprise.

  In this case, the nucleic acid probe may be a nucleic acid probe complementary to a target sequence including a tag sequence and at least a part of a sequence derived from a template sequence for each nucleic acid partial sequence.

  In addition, the first primer included in the assay kit includes the kind and amount of primer necessary for use in at least one analysis. When n samples are analyzed simultaneously, n types of first primers are used. When different types of first primers are compared in terms of sequence, the sequences may be identical except for the tag sequence.

  The second primer included in the assay kit includes an amount of primer necessary for use in at least one analysis. In addition to the first primer, the second primer may include a tag sequence. In that case, the second primer may comprise the type and amount of primer necessary for use in at least one analysis. When n samples are analyzed simultaneously, n types of second primers are used. When different types of second primers are compared in terms of sequence, the sequences may be the same except for the tag sequence.

  When the assay kit uses the PCR method, the first primer includes, for example, a tag sequence associated with at least n analytes that can contain at least a template nucleic acid, and a partial sequence of the template nucleic acid. There may be n kinds of forward primers or reverse primers including a complementary sequence (where n is an integer of 2 or more). The second primer contains the amount of primer necessary for use in at least one analysis. Such a second primer may be at least one reverse primer or forward primer used in pairs with the first primer. If the first primer is a forward primer, the second primer is a reverse primer, and if the first primer is a reverse primer, the second primer may be a forward primer.

An assay kit for analytical methods utilizing the LAMP method is also provided. When F3 region, F2 region, LF region and F1 region are designed from the 5 ′ end side of the template sequence, and B3c region, B2c region, LBc region and B1c region are designed from the 3 ′ end side, the following 1 to 9 A primer set selected from at least one selected from the group consisting of:
1． FIP primer (first primer) having a sequence complementary to F1 on the 5 ′ end side, the same sequence as F2 on the 3 ′ end side, and a tag sequence that differs depending on the specimen in the F2 sequence, and 5 ′ BIP primer (second primer) having the same sequence as B1c on the terminal side and a sequence complementary to B2c on the 3 'terminal side;
2． FIP primer (second primer) having the same sequence as F2 on the 3 'end side with the sequence complementary to F1 on the 5' end side, and the same sequence as B1c on the 5 'end side, on the 3' end side BIP primer (first primer) having a sequence complementary to B2c and having a tag sequence that differs depending on the sample inserted in the B2c sequence;
3． FIP primer (first primer) having a sequence complementary to F1 on the 5 ′ end side, the same sequence as F2 on the 3 ′ end side, and a tag sequence that differs depending on the specimen in the F2 sequence, and 5 ′ BIP primer (second primer) having the same sequence as B1c on the terminal side, a sequence complementary to B2c on the 3 'terminal side, and a tag sequence that differs depending on the specimen inserted in the B2c sequence;
Four. FIP primer (first primer) that has a sequence complementary to F1 on the 5 'end, the same sequence as F2 on the 3' end, and a tag sequence that differs depending on the sample in the F2 sequence (first primer), 5 'end A BIP primer (second primer) having the same sequence as B1c on the side and a sequence complementary to B2c on the 3 'end side, an F3 primer (third primer) having the same sequence as the F3 region, and a B3c region B3 primer with a complementary sequence (fourth primer);
Five. FIP primer (second primer) that has the same sequence as F2 on the 3 'end with the sequence complementary to F1 on the 5' end, the same sequence as B1c on the 5 'end, and B2c on the 3' end A BIP primer (first primer) having a sequence complementary to the B2c sequence and a tag sequence that differs depending on the sample, and an F3 primer (third primer) having the same sequence as the F3 region, and the B3c region B3 primer with a complementary sequence (fourth primer);
6． FIP primer (first primer) that has a sequence complementary to F1 on the 5 'end, the same sequence as F2 on the 3' end, and a tag sequence that differs depending on the sample in the F2 sequence (first primer), 5 'end BIP primer (second primer) that has the same sequence as B1c on the side, a sequence complementary to B2c on the 3 'end side, and a tag sequence that differs depending on the sample in the B2c sequence, the same sequence as the F3 region An F3 primer (third primer), and a B3 primer (fourth primer) having a sequence complementary to the B3c region;
7． FIP primer (first primer) that has a sequence complementary to F1 on the 5 'end, the same sequence as F2 on the 3' end, and a tag sequence that differs depending on the sample in the F2 sequence (first primer), 5 'end A BIP primer (second primer) having the same sequence as B1c on the side and a sequence complementary to B2c on the 3 'end side, an F3 primer (third primer) having the same sequence as the F3 region, and a B3c region B3 primer having a complementary sequence (fourth primer) and LFc primer having a sequence complementary to the LF region (fifth primer) and / or LBc primer having the same sequence as the LBc region (sixth primer) Primer);
8． FIP primer (second primer) that has the same sequence as F2 on the 3 'end with the sequence complementary to F1 on the 5' end, the same sequence as B1c on the 5 'end, and B2c on the 3' end A BIP primer (first primer) having a sequence complementary to the B2c sequence and a tag sequence that differs depending on the sample, and an F3 primer (third primer) having the same sequence as the F3 region, and the B3c region B3 primer having a complementary sequence (fourth primer) and LFc primer having a sequence complementary to the LF region (fifth primer) and / or LBc primer having the same sequence as the LBc region (sixth primer) Primer);
9． FIP primer (first primer) that has a sequence complementary to F1 on the 5 'end, the same sequence as F2 on the 3' end, and a tag sequence that differs depending on the sample in the F2 sequence (first primer), 5 'end BIP primer (second primer) that has the same sequence as B1c on the side, a sequence complementary to B2c on the 3 'end side, and a tag sequence that differs depending on the sample in the B2c sequence, the same sequence as the F3 region F3 primer (third primer), and B3 primer (fourth primer) having a sequence complementary to the B3c region, and LFc primer (fifth primer) having a sequence complementary to the LF region, and / or Or an LBc primer (sixth primer) having the same sequence as the LBc region.

  Further, the assay kit may include an enzyme and / or container for performing an amplification reaction, a washing solution, a buffer solution, salts for preparing a buffer solution, and the like. The DNA chip may be included in a state where the nucleic acid probe and the substrate are not integrated.

  Such an assay kit makes it possible to analyze nucleic acids more easily.

[Example]
A specific example of detection by the method of the present invention will be shown. The following example is an example of a method for analyzing a plurality of samples using a primer and a DNA chip in which different tag sequences are inserted for each sample.

(1) Amplification of template nucleic acid First, gene amplification was performed using a primer into which a tag sequence was inserted, and it was confirmed with a restriction enzyme whether the target gene product was produced. The human MTHFR gene of SEQ ID NO: 21 was used as a template nucleic acid, which was amplified by the LAMP method.

[Primer]
The synthetic DNA oligo primers used for amplification of the target nucleic acid are shown in Table 1.

FIP primer without base insertion (FIP-1; SEQ ID NO: 1), AC (FIP-2; SEQ ID NO: 2), ACAC (FIP-3; SEQ ID NO: 3) at the 4th base from the 3 ′ end side of the FIP primer, ACACAC (FIP-4; SEQ ID NO: 4), TGTG (FIP-5; SEQ ID NO: 5), TCTC (FIP-6; SEQ ID NO: 6) inserted, AC (6th base from FIP primer 3 'end) FIP-7 SEQ ID NO: 7), ACAC (FIP-8; SEQ ID NO: 8), ACACAC (FIP-9; SEQ ID NO: 9), TGTG (FIP-10; SEQ ID NO: 10), TCTC (FIP-11; SEQ ID NO: 11) 11 types of FIP primers were prepared. The BIP primer (SEQ ID NO: 12), F3 primer (SEQ ID NO: 13), B3 primer (SEQ ID NO: 14), and LBc primer (SEQ ID NO: 15) were used in common.

[LAMP reaction solution]
The composition of the reaction solution used in the LAMP method is shown in Table 2.

[Amplification of nucleic acid]
Nucleic acids were amplified by the LAMP method at 63 ° C. for 1 hour. In the negative control, sterilized water was used instead of the template nucleic acid. The rise time of amplification was determined by detecting the white turbidity of pyrophosphoric acid produced in the amplification reaction and magnesium in the solution using a Loopamp real-time turbidity measuring device.

[Confirmation of target product by restriction enzyme]
A fragment into which AC (FIP-2), ACAC (FIP-3), or ACACAC (FIP-4) was introduced at the fourth base from the 3 ′ end side of the FIP primer was cleaved with AccI. The FIP primer without base insertion (FIP-1) is not cleaved by AccI, but the insertion part of the primer is looped out when AC (FIP-2), ACAC (FIP-3), or ACACAC (FIP-4) is inserted. To anneal to the template nucleic acid. Therefore, when the target product is produced, the amplified product is cleaved with the AccI.

  Similarly, the insert containing AC (FIP-7), ACAC (FIP-8), and ACACAC (FIP-9) at the 6th base from the 3 'end side of the FIP primer was cleaved with CviQI. FIP primer without base insertion (FIP-1) is not cleaved by CviQI. When AC (FIP-7), ACAC (FIP-8), or ACACAC (FIP-9) is inserted, the primer insert loops out and anneals to the template nucleic acid. Therefore, if the target product is produced, the amplified product is cleaved with CviQI.

[result]
In the case of no base insertion (FIP-1), the rise time was 29 minutes. Sample with AC (FIP-2), ACAC (FIP-3), ACACAC (FIP-4), TGTG (FIP-5), TCTC (FIP-6) inserted at the 4th base from the 3 'end of the FIP primer The rise times were 32 minutes, 37 minutes, 38 minutes, 38 minutes, and 37 minutes. Furthermore, AC (FIP-7), ACAC (FIP-8), ACACAC (FIP-9), TGTG (FIP-10), and TCTC (FIP-11) were inserted at the 6th base from the 3 'end of the FIP primer. The rise time of the sample was 30 minutes, 38 minutes, 47 minutes, 32 minutes, and 35 minutes. Amplification did not rise in the negative control. From this, it was clarified that the amplification started without any problem within 50 minutes and the amplification product was obtained by inserting the base. Further, as shown in FIG. 13, it was confirmed that the target product was amplified by the restriction enzyme.

(2) DNA chip detection of target nucleic acid
Amplification was performed using a primer into which ACAC (FIP-3), TGTG (FIP-5), and TCTC (FIP-6) were inserted at the fourth base from the 3 ′ end side of the FIP primer. B3, F3, BIP and LBc primers were used in common (see Table 1). Two types of templates were prepared: one with the human genome added and one with sterilized water added instead of adding the human genome. Thereafter, chip detection was performed on the obtained amplification product.

[Nucleic acid probe]
The synthetic DNA oligonucleic acid probes used for detection are shown in Table 3. In this example, a nucleic acid probe having ACAC inserted at the 4th base from the 3 ′ end of the FIP primer (probe 2; SEQ ID NO: 17), TGTG inserted (probe 3: SEQ ID NO: 18), or TCTC inserted (Probe 4; SEQ ID NO: 19) and a single-base mutation (probe 5; SEQ ID NO: 20) were prepared in a portion that becomes a complementary strand of the region derived from the template sequence. As a negative control, a negative probe (probe 1; SEQ ID NO: 16) having a sequence unrelated to the MTHFR gene sequence was used. The above 5 types of probes were thiol-modified at the 3 ′ end for immobilization on the gold electrode.

[DNA chip for electrochemical detection]
The nucleic acid probe was immobilized on a gold electrode. The nucleic acid probe was immobilized using the strong covalent bond between thiol and gold. The nucleic acid probe solution was spotted on a gold electrode and allowed to stand at 25 ° C. for 1 hour. Then, it was immersed in a 1 mM mercaptohexanol solution and washed with a 0.2 × SSC solution. The same probe was spotted on each of the four electrodes. The position of the electrode of each nucleic acid probe is shown below. After washing, it was washed with ultrapure water and air-dried to obtain a DNA chip for electrochemical detection.

[Electrode arrangement]
The correspondence between the electrode and the nucleic acid probe immobilized thereon is as follows.

1-4 electrode Negative probe (nucleic acid probe 1)
5-8 electrode ACAC detection probe (nucleic acid probe 2)
9-12 electrode TGTG detection probe (nucleic acid probe 3)
13-16 electrode TCTC detection probe (nucleic acid probe 4)
17-20 electrode ACAC single nucleotide mutation-introducing probe (nucleic acid probe 5).
[Hybridization]
The DNA chip for electrochemical detection produced as described above was immersed in a LAMP product to which 2 × SSC salt was added and allowed to stand at 55 ° C. for 10 minutes for hybridization. Thereafter, the DNA chip for electrochemical detection was washed by immersion in a 0.2 × SSC solution at 48 ° C. for 10 minutes. Next, the DNA chip for electrochemical detection was immersed in a phosphate buffer containing 50 μM Hoechst 33258 solution as an intercalating agent for 1 minute. Thereafter, the oxidation current response of Hoechst 33258 solution was measured.

[result]
FIG. 14A shows the amplification of the TGTG (FIP-5) and TCTC (FIP-6) insertion primer sets amplified by adding the ACAC (FIP-3) insertion primer set amplified by adding the human genome and sterilized water. It is a mixture of products. FIG. 14B shows amplification of the TGTG (FIP-5) insertion primer set amplified by adding the human genome and the ACAC (FIP-3) and TCTC (FIP-6) insertion primer set amplified by adding sterile water. It is a mixture of products. Similarly, FIG. 14C shows the amplification product of the TCTC (FIP-6) insertion primer set amplified by adding the human genome and the ACAC (FIP-3) and TGTG (FIP-5) insertion primer set amplified by adding sterile water. Of amplification products. As a result of chip detection, a high signal was obtained from the nucleic acid probe 2 for detecting ACAC in FIG. 14A. In FIG. 14B, a high signal was obtained from the nucleic acid probe 3 for detecting TGTG. Similarly, in FIG. 14C, a high signal was obtained from the nucleic acid probe 4 for detecting TCTC. From this, it was shown that a DNA chip can be detected simultaneously for a plurality of specimens with a primer inserted with the tag sequence of the present invention. Further, in FIG. 14A, by stricter the washing conditions, the signal for the ACAC detection probe and the nucleic acid probe 5 that is one base different from that of the nucleic acid probe 2 is low, and the region derived from the template sequence is mutated. It was suggested that the mutation was detectable by positioning.

  Although this example shows simultaneous detection of three samples, it is clear that the number of samples is not limited to this. It can be changed as necessary. Obviously, the insertion position of the tag sequence and the number of bases are not limited to this. It can be changed as necessary.

As shown in the examples, a plurality of specimens were easily and easily analyzed in a short time by the analysis method of the present invention.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
(1) A method for analyzing multiple samples,
(A) preparing a primer set including a first primer including a tag sequence having a different sequence for each specimen and a second primer used in a pair with the first primer for each specimen; Wherein the tag sequence is designed to loop out when the first primer hybridizes to a template sequence in the template nucleic acid for each specimen;
(B) a step of amplifying a template nucleic acid for each specimen using the primer set corresponding to each specimen in an independent reaction system for each specimen to obtain an amplification product into which the tag sequence has been introduced;
(C) mixing the amplification products obtained for each specimen into one;
(D) reacting a nucleic acid probe having a sequence for detecting a target sequence containing the tag sequence and immobilized on a substrate, with the amplification product mixed in step (c);
(E) detecting the presence and / or amount of the target nucleic acid for each specimen by detecting the amount of hybridization produced in step (d);
An analysis method comprising:
(2) The analysis method according to (1), wherein the nucleic acid probe has a sequence for detecting a target sequence including the tag sequence and a sequence derived from the template sequence for each specimen.
(3) The analysis method according to (1), wherein at least one of the primer sets is selected from the following group consisting of 1 to 9;
When setting F3 region, F2 region, LF region, F1 region from the 5 ′ end side of the template sequence, B3c region, B2c region, LBc region, B1c region from the 3 ′ end side,
1． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, and the same as B1c on the 5 'end side A BIP primer having a sequence and a sequence complementary to B2c on the 3 ′ end side;
2． FIP primer with a sequence complementary to F1 at the 5 'end and the same sequence as F2 at the 3' end, and a sequence complementary to B2c at the 3 'end with the same sequence as B1c at the 5' end A BIP primer having a B2c sequence and a tag sequence that differs depending on the specimen;
3． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, and the same as B1c on the 5 'end side A BIP primer having a sequence, a sequence complementary to B2c on the 3 ′ end side, and a tag sequence that differs depending on the specimen inserted in the B2c sequence;
Four. FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side A BIP primer having a sequence complementary to B2c at the 3 ′ end, an F3 primer having the same sequence as the F3 region, and a B3 primer having a sequence complementary to the B3c region;
Five. FIP primer with a sequence complementary to F1 at the 5 'end and the same sequence as F2 at the 3' end, and a sequence complementary to B2c at the 3 'end with the same sequence as B1c at the 5' end And a BIP primer having a tag sequence that differs depending on the specimen in the B2c sequence, an F3 primer having the same sequence as the F3 region, and a B3 primer having a sequence complementary to the B3c region;
6． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side A BIP primer that has a sequence complementary to B2c on the 3 'end side, and a tag sequence that differs depending on the sample is inserted in the B2c sequence, an F3 primer that has the same sequence as the F3 region, and a sequence that is complementary to the B3c region B3 primer with
7． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side BIP primer with a sequence complementary to B2c on the 3 'end side, F3 primer with the same sequence as the F3 region, B3 primer with a sequence complementary to the B3c region, LFc with a sequence complementary to the LF region A primer and an LBc primer having the same sequence as the LBc region;
8． FIP primer with a sequence complementary to F1 at the 5 'end and the same sequence as F2 at the 3' end, and a sequence complementary to B2c at the 3 'end with the same sequence as B1c at the 5' end Also, a BIP primer with a tag sequence that differs depending on the sample in the B2c sequence, an F3 primer having the same sequence as the F3 region, a B3 primer having a sequence complementary to the B3c region, and an LFc having a sequence complementary to the LF region A primer and an LBc primer having the same sequence as the LBc region;
9． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side A BIP primer with a sequence complementary to B2c on the 3 'end side, and a tag sequence that differs depending on the sample inserted in the B2c sequence, an F3 primer having the same sequence as the F3 region, and a sequence complementary to the B3c region A B3 primer having an LFc primer having a sequence complementary to the LF region, and an LBc primer having the same sequence as the LBc region;
A method in which the amplification in (b) is the LAMP method.
(4) A method for analyzing a plurality of partial nucleic acid sequences in a sample nucleic acid,
(A) For each nucleic acid partial sequence, a primer set including a first primer including a tag sequence having a different sequence for each partial nucleic acid sequence and a second primer used in a pair with the first primer. And wherein the tag sequence is designed to loop out when the first primer hybridizes to a template sequence for each nucleic acid subsequence;
(B) using the primer set, multi-amplifying a template sequence for each nucleic acid partial sequence to obtain an amplification product into which the tag sequence has been introduced;
(C) reacting the nucleic acid probe immobilized on a substrate for detecting a target sequence containing the tag sequence with the amplification product obtained in step (b);
(D) detecting the presence and / or amount of the target nucleic acid for each nucleic acid sequence by detecting the amount of hybridization produced in step (c);
An analysis method comprising:
(5) The analysis method according to (4), wherein the nucleic acid probe has a sequence for detecting a target sequence including the tag sequence and a sequence derived from a template sequence for each nucleic acid partial sequence.
(6) The analysis method according to (4), wherein the primer set is at least one selected from the group consisting of 1 to 9 below:
When setting F3 region, F2 region, LF region, F1 region from the 5 ′ end side of the template sequence, and B3c region, B2c region, LBc region, B1c region from the 3 ′ end side,
1． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, and the same as B1c on the 5 'end side A BIP primer having a sequence and a sequence complementary to B2c on the 3 ′ end side;
2． FIP primer with a sequence complementary to F1 at the 5 'end and the same sequence as F2 at the 3' end, and a sequence complementary to B2c at the 3 'end with the same sequence as B1c at the 5' end A BIP primer having a B2c sequence and a tag sequence that differs depending on the specimen;
3． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, and the same as B1c on the 5 'end side A BIP primer having a sequence, a sequence complementary to B2c on the 3 ′ end side, and a tag sequence that differs depending on the specimen inserted in the B2c sequence;
Four. FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side A BIP primer having a sequence complementary to B2c at the 3 ′ end, an F3 primer having the same sequence as the F3 region, and a B3 primer having a sequence complementary to the B3c region;
Five. FIP primer with a sequence complementary to F1 at the 5 'end and the same sequence as F2 at the 3' end, and a sequence complementary to B2c at the 3 'end with the same sequence as B1c at the 5' end And a BIP primer having a tag sequence that differs depending on the specimen in the B2c sequence, an F3 primer having the same sequence as the F3 region, and a B3 primer having a sequence complementary to the B3c region;
6． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side A BIP primer that has a sequence complementary to B2c on the 3 'end side, and a tag sequence that differs depending on the sample is inserted in the B2c sequence, an F3 primer that has the same sequence as the F3 region, and a sequence that is complementary to the B3c region B3 primer with
7． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side BIP primer with a sequence complementary to B2c on the 3 'end side, F3 primer with the same sequence as the F3 region, B3 primer with a sequence complementary to the B3c region, LFc with a sequence complementary to the LF region A primer and an LBc primer having the same sequence as the LBc region;
8． FIP primer with a sequence complementary to F1 at the 5 'end and the same sequence as F2 at the 3' end, and a sequence complementary to B2c at the 3 'end with the same sequence as B1c at the 5' end Also, a BIP primer with a tag sequence that differs depending on the sample in the B2c sequence, an F3 primer having the same sequence as the F3 region, a B3 primer having a sequence complementary to the B3c region, and an LFc having a sequence complementary to the LF region A primer and an LBc primer having the same sequence as the LBc region;
9． FIP primer with a sequence complementary to F1 on the 5 'end side, the same sequence as F2 on the 3' end side, and a tag sequence that differs depending on the sample inserted in the F2 sequence, the same sequence as B1c on the 5 'end side A BIP primer with a sequence complementary to B2c on the 3 'end side, and a tag sequence that differs depending on the sample inserted in the B2c sequence, an F3 primer having the same sequence as the F3 region, and a sequence complementary to the B3c region A B3 primer having an LFc primer having a sequence complementary to the LF region, and an LBc primer having the same sequence as the LBc region;
A method in which the amplification in (b) is the LAMP method.
(7) An assay kit for use in the method for analyzing a plurality of specimens according to (1) above,
A tag sequence having a different sequence for each specimen, wherein the tag sequence is designed to loop out when hybridized to a template sequence in a template nucleic acid for each specimen; A primer set comprising a second primer used in pairs with a second primer;
An assay kit comprising a substrate and a DNA chip comprising a nucleic acid probe complementary to a target sequence including the tag sequence immobilized on the substrate.
(8) The assay kit according to (7), wherein the nucleic acid probe is a nucleic acid probe complementary to a target sequence including the tag sequence and a sequence derived from a template sequence in the specimen.
(9) An assay kit for use in the method for analyzing a plurality of nucleic acid partial sequences according to (4),
A tag sequence having a different sequence for each nucleic acid partial sequence, wherein the tag sequence is designed to loop out when hybridized to a template sequence for each nucleic acid partial sequence; A primer set comprising a first primer and a second primer used in pairs;
An assay kit comprising a substrate and a DNA chip comprising a nucleic acid probe complementary to a target sequence including the tag sequence immobilized on the substrate.
(10) The assay kit according to (9), wherein the nucleic acid probe is a nucleic acid probe complementary to a target sequence including a sequence derived from a template sequence for each of the tag sequence and the nucleic acid partial sequence.

  The present invention is useful for analyzing nucleic acids such as genes in the fields of medicine, medicine, food, agriculture, fishery, livestock industry and horticulture.

  DESCRIPTION OF SYMBOLS 1 ... Base | substrate, 2 ... Immobilization area | region, 11 ... Base | substrate, 12 ... Electrode, 13 ... Pad

Claims (1)

A target in a plurality of samples characterized by having a probe region in which a probe having a sequence complementary to a tag sequence for identifying a sample and a sequence complementary to a target sequence contained in the sample is immobilized A microarray that detects nucleic acids.

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