KR20150079394A - Method and Kit for Analyzing the Gene Variation of the Target Nucleic Acids - Google Patents
Method and Kit for Analyzing the Gene Variation of the Target Nucleic Acids Download PDFInfo
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Abstract
The present invention relates to a method for analyzing gene mutation using probes, which comprises specifically preparing probes that completely complementarily bind to a specific region of a gene mutation to be analyzed, and analyzing gene mutations included in the biological sample by multiple examinations, Methods and kits for determining the biological significance of gene mutations are provided.
Description
The present invention relates to a probe set used for discriminating a kind of a gene mutation in a target nucleic acid and a method for discriminating a mutation. The present invention also relates to a probe set for discriminating a target nucleic acid including an Ebola virus and the like, and a method and kit for discriminating a mutation.
Gene variants include single nucleotide polymorphism (SNP) and structural variability. Genetic mutations are known to determine individual differences, such as phenotype changes, susceptibility to disease, and response to therapeutic agents. In particular, mutations involved in disease development and progression are known as disease-associated genetic mutations (Disease-associated Genetic Variants).
Genetic mutations (including base polymorphisms) are factors that greatly affect the phenotype of an organism, and predicting the phenotype or predicting the effect of a drug is frequently performed by examining the type of mutation. As a method for discriminating the type of mutant base, there are known a direct sequencing method, an Invader method, a method using a DNA chip immobilized with a polymorphism-specific probe, an allele specific PCR method, and the like. It is not sufficient in terms of detection sensitivity, and development of a method capable of discriminating the kind of gene mutation with a simpler and higher sensitivity is desired.
Ebola virus is a virus that causes acute febrile infection. Ebola virus infection is caused by sudden headache, myalgia, fever, and general anesthesia and dysfunction, skin rash, hypotension and often systemic bleeding. It is a serious infectious disease of about 60%. In March 2014, Ebola virus was detected in patients with fever, vomiting, and severe diarrhea in Guinea. In the past, Ebola virus disease occurred mainly in central Africa, and in West Africa, only one person had been infected in 1994 on the Ivory Coast. The epidemic of Ebola virus in West Africa in 2014 has spread to more than 9,02,000 as of October 20, 2014 and has spread to Guinea, Sierra Leone, Liberia, Nigeria, Lagos, USA and Spain. It was identified as Zaire Ebola virus which was popular in the center.
Ebola virus (Ebolavirus) is a single-stranded RNA virus belonging to the filovirus family together with Marburg virus. The Ebola virus has four subspecies (Zaire, Sudan, Cote dlvoire, Reston) named according to where they were first discovered. All but the Reston subspecies originating in the Philippines are viruses of African origin. The prevalence of Ebola virus hemorrhagic fever is usually caused by a virus that is transmitted to the people around a person after the virus has been transferred from the host in a natural environment. The host of this disease has not yet been identified, but bat, rodent, and ape have been reported to be the host of the virus. Hosts causing the pandemic in 2014 are also unclear, but bats are presumed to be the cause.
Early symptoms of Ebola virus infection are nonspecific symptoms that are difficult to distinguish from other infectious diseases such as typhoid fever, malaria, and Lassa fever. Clinically clear bleeding symptoms are known to occur only in about one-third of all patients. Until now, there is no specific treatment for viruses, and there is no conservative treatment for shock and blood loss, bleeding tendency. Humanized monoclonal antibodies, such as ZMapp, have been used experimentally in the West African Ebola virus disease in 2014, but their effectiveness and safety are unclear.
The existing Ebola virus diagnosis technology is to confirm the presence of nucleic acid by amplifying the viral nucleic acid using a reverse transcription-polymerase chain reaction (RT-PCR) in a suspected blood sample through an antigen-antibody test will be.
Recently, Ebola virus, an RNA nucleic acid, has been reported to have a very high frequency of genetic mutations and to report 395 mutations, including 50 fixed nonsynonymous changes, including 8 of well-conserved positions in Ebola virus (Gire, SK, Goba, A, et Genomic surveillance elucidates Ebola virus origin and transmission during the 2014 outbreak. Science, 2014 DOI: 10.1126 / science.1259657). Of course, these gene mutations have little or no biologic and medical significance, but in general, gene mutations are very important both academically and medically.
Future Ebola virus mutations will play a major role in Ebola virus diagnosis, vaccination and treatment. Currently, virus drugs and the like have been developed. However, there have been many reports of mutant viruses that do not respond to antiviral agents depending on the genetic mutation of viruses. In order to effectively proceed therapy, gene mutations are detected in advance, It is important to determine the dosing policy. Therefore, the present invention provides a method for efficiently analyzing gene mutation of Ebola virus.
Many methods have been developed to accurately and more conveniently detect gene mutations. In order to detect the mutation of the virus, PCR was performed directly after the PCR, restriction enzyme digestion, electrophoresis, restriction enzyme digestion, mass spectrometry (PCR-RFMP method), LightCycler probe hybridization and primer-specific real-time PCR method, and the like. However, it is difficult to detect a low copy number of virus in the conventional inspection method, and a method that can detect the virus with higher sensitivity is required. Although TaqMan Mismatch Amplification Mutation Assay has been reported as a method for analyzing virus genetic mutation, this method is a method in which an amplification signal is detected only in the case of a target sequence mutation by putting a mismatch in a primer, In the case of negative, there is a problem that a separate analysis is required to identify the mutation of the site.
The present inventors have developed a method for overcoming this problem and examining the target nucleic acid gene mutation by an oligonucleotide ligase assay (OLA) method having a minimum detection limit superior to qPCR. The present invention relates to a method for inspecting a gene mutation of a target nucleic acid using an OLA and a universal PCR primer, and a gene mutation diagnosis kit using the same, wherein a mutation of a target nucleic acid in a blood or tissue is high Specificity of the target nucleic acid, and the test method that has been tested through various steps in the conventional test method can be used to quickly and inexpensively diagnose the gene mutation of the target nucleic acid by a single test method.
It is an object of the present invention to provide a method for discriminating gene mutation more easily and with high sensitivity, and to provide a reagent therefor. The present invention also provides a method for identifying a gene mutation in a target nucleic acid containing an ebola viral nucleic acid and a reagent used therefor, more specifically, a method for determining a gene mutation of an individual, It is intended to provide reagents.
In order to accomplish the above object, the present invention provides a mutant type specific oligonucleotide comprising a target nucleic acid gene mutation including the Ebola virus to be analyzed and a complementary base sequence of the nucleic acid nucleic acid strand in the 5 ' -Specific Oligonucleotide (ASO) and a complementary base sequence of the nucleic acid single strand at a distance in the 3 'direction from the mutation of the gene is a Locus-Specific Oligonucleotide (LSO) probe , A region including nucleotide sequences that indicate gene mutation, and a complementary base sequence of a universal PCR primer. The target nucleic acid, the probe set, and the PCR amplified by the universal PCR primer Genetic mutation analysis method and kit for analyzing product to provide.
The present invention also provides a method and kit for gene mutation analysis using the probe set, characterized in that the ASO probe is divided into wild type or mutant type and the gene mutation is analyzed.
The present invention may also be used to analyze a gene mutation by designing a detection probe based on the nucleotide sequence of the target nucleic acid located between the positions where the ASO probe and the LSO probe bind. Wherein the detection probe is a base sequence comprising a base sequence region between nucleotide sequences in which the ASO probe and the LSO probe are complementarily bound to each other, A nucleotide sequence or a nucleotide sequence complementary to the above nucleotide sequence and having a fluorophore at the 5 'end, a quencher at the 3' end, and a melting temperature of the probe being 3 or more higher than the melting temperature of the PCR primer There is provided a method and kit for gene mutation analysis using a probe, characterized in that real-time PCR is carried out using a probe including a detection probe containing an oligonucleotide to discriminate the objective mutation with a simple and high sensitivity.
The present invention also relates to a method for producing a partial double-stranded nucleic acid, comprising the steps of: preparing the ASO probe and the LSO probe; nucleic acid comprising the gene mutation; hybridizing the ASO probe and the LSO probe to form a partial double- Preparing a complete double-stranded nucleic acid by PCR with a universal PCR primer to produce an amplification product, and analyzing the amplification product to determine the gene mutation. A method and a kit for gene analysis using probes are provided.
The present invention also relates to a gene analysis method and a kit using the probe, characterized by analyzing the PCR amplification product and analyzing the frequency of occurrence of the wild type and mutation type of the mutation in a biological sample containing the mutation to provide.
The present invention is also characterized in that the present invention is carried out through a gene analysis method using a probe, and comprises a sample processing device for preparing a nucleic acid in a sample containing the nucleic acid nucleic acid, the ASO probe, the LSO probe, There is provided a gene analysis apparatus using a probe characterized by a gene analysis system comprising a module for producing a partial double stranded nucleic acid as a complete double strand and amplifying the amplified product, and a module for analyzing the amplified product.
The present invention can identify the biological significance of a mutation in a biological sample by analyzing a target nucleic acid gene mutation including Ebola virus with a simple and high sensitivity using a probe. Furthermore, by analyzing various gene mutations in a single test, the method provides a method for efficiently determining differences between individuals, such as a change in phenotype, sensitivity to disease, and response to a therapeutic agent in a biological sample.
1 shows the structure of an ASO probe and an LSO probe,
FIG. 2 is a flow chart for analyzing gene mutations by analyzing amplification products using a nucleotide sequence site that directs a gene mutation to ASO probe and LSO probe, wherein a is a wild type and b is a mutation type. At the same time,
FIG. 3 is a flow chart for analyzing gene mutation with qPCR and a detection probe after securing a site having a gene mutation using an ASO probe and an LSO probe,
FIG. 4 shows the results of analysis of the SNPs at the mutation positions 6175, 6909 and 7044 of the Ebola virus gene in terms of amplification product size
The present invention seeks to analyze a target nucleic acid gene mutation including Ebola virus using a probe set and a universal PCR primer.
The probe set used in the present specification and the gene analysis method and kit using the universal PCR primer are characterized in that a mutation type specific oligonucleotide (ASO) probe comprising the gene mutation and complementary base sequences of the gene in the 5 ' (LSO) probe comprising a complementary base sequence of the gene at a certain distance in the 3 'direction from the gene mutation, and a nucleotide sequence that is complementary to the nucleotide sequence that directs the gene mutation And a complementary base sequence of a universal PCR primer. The gene mutation can be analyzed by analyzing the PCR amplification product obtained using the target nucleic acid, the probe set, and the universal PCR primer.
In the present invention, a nucleic acid of a nucleic acid has a meaning including a DNA (gDNA and cDNA) and an RNA molecule, and in the nucleic acid molecule, a nucleotide which is a basic constituent unit is not only a natural nucleotide but also an analogue (Scheit, Nucleotide Analogs, John Wiley, New York (1980); Uhlman and Peyman, 1990, Chemical Reviews, 90: 543-584).
The gene refers to a gene of interest among genes included in a specific sample. The target gene may be DNA or RNA having an artificial sequence that is artificially created, and means all genes obtained from cells of animals and plants, including viruses and microorganisms obtained from nature.
The SNP, the structural variation, the CNV, the methylation, and the like mean the gene mutation. Genetic mutations are known to determine individual differences, such as phenotypic changes, susceptibility to disease, and response to therapeutic agents. In particular, mutations involved in disease development and progression are called disease-associated gene mutations.
The locus is a position of a specific mutation on the gene, and the allele is a wild type or variant of a specific mutation.
Preferably, the present invention provides an ASO probe and an LSO probe for gene mutation analysis using a base sequence indicating the gene mutation or a base sequence between the binding of the AS0 probe and the LSO probe to the target nucleic acid.
The construction of the ASO probe comprises: (i) a region (P) in which a forward primer of a pair of universal PCR primers is completely complementarily bound to amplify a region containing the mutated target gene; (ii) (Iii) a mutation adjacent specific region (H) having a substantially complementary base sequence with the target gene, and (iv) a mutation specific to the mutation site And an area probe (X) or the like (Fig. 1).
Wherein the ASO probe is represented by the following general formula I:
5'-P? -R? -H? -X? -3 '(I)
In the above general formula (I), P is a region in which a forward primer is completely complementary to a pair of universal PCR primers, and R is a base sequence for directing gene mutation, (Gerry, NP., Et al., 1999. Journal of Molecular Biology, 292: 251-262). Alternatively, when the size of the PCR product is used, poly A may be preferably used have.
H is a mutation-adjacent specific region having a substantially complementary hybridization sequence with the hybridizing target nucleic acid, and V is a mutation-specific region corresponding to the mutation. ?,? and? are the number of nucleotides,? and? are integers of 8 to 30,? is an integer of 0 to 40,? is an integer of 1 to 3, and preferably?
As the ASO probe, a perfectly complementary sequence may be used in the sequence including the mutation, but a substantially complementary sequence may be used so long as it does not interfere with the specific hybridization. Preferably, the ASO probe comprises a sequence capable of hybridizing to a sequence comprising 10 to 30 consecutive nucleotide residues comprising a mutation. More preferably, the 3'-end of the ASO probe has a complementary base in the mutated base. In general, the stability of the duplex formed by hybridization tends to be determined by the match of the terminal sequence, so that the terminal region is not hybridized in the ASO probe with the complementary base at the 3 ' -terminal base Otherwise, such a duplex can be disjointed under stringent conditions.
Preferably, the ASO probe may be composed of two or more kinds of probes such as a wild type and a mutated type according to a mutation-specific region (X) having mutation information.
The construction of the LSO probe includes (i) a nucleotide sequence region (H) in which the target nucleic acid is completely complementary to a base at a certain distance from the 3 'end of the ASO probe, (ii) (R) consisting of a base sequence, and (iii) a base sequence region (P) in which a reverse primer is complementary to a pair of universal PCR primers (Fig. 1).
In the above, the LSO probe is represented by the following general formula II:
5'-Hα-Rβ-Pγ-3 '(II)
In the above formula (II), H is a region in which the target nucleic acid is completely complementary to a base at a certain distance from the 3 'end of the LSO probe, and R is a nucleotide sequence for directing gene mutation When the amplification product is classified into a base sequence, zip-code or a product of PCR can preferably be used. P is the region where the reverse primer completes complementary binding in the universal PCR primer pair. ?,? and? are the number of nucleotides,? and? are integers of 8 to 30, and? is an integer of 0 to 40.
Preferably, the nucleic acid, the ASO probe and the LSO probe are hybridized, elongated and ligated, or when the ASO probe and the LSO probe are immediately adjacent to each other, hybridization or ligation reaction is performed, followed by PCR using universal PCR primer pairs PCR amplification products are used to analyze mutation types and mutation positions as a result of analysis of nucleotide sequences that direct gene mutation.
The ASO probe and the LSO probe used in the present invention are hybridized or annealed at one site of the template to form double strands. Nucleic acid hybridization conditions suitable for forming such a double stranded structure can be found in Nucleic Acid Hybridization < RTI ID = 0.0 > (" , A Practical Approach, IRL Press, Washington, DC (1985).
Preferably, the melting temperature (Tm) of the ASO probe and the LSO probe is 50 to 55 ° C.
Preferably, the distance between the constant position of the ASO probe that makes a complementary binding to the gene and the LSO probe position that makes a complementary binding to the gene is 0-1,000 bp.
The nucleotide sequence that directs the gene mutation may be zip code (Gerry, N. P., et al., 1999. Journal of Molecular Biology. 292: 251-262). For the analysis of the zip code base sequence in the above PCR product, a hybridization method in which the base sequence is generally analyzed as a complementary base sequence can be used.
Or by using a hybridization or restriction enzyme to a site containing a restriction enzyme recognition site.
Preferably, the distance between the gene and complementary binding sites of the ASO probe and the LSO probe is determined according to the mutation position, and the length of the ASO probe and the LSO probe as the probe are determined according to the mutation type, The position and type of mutation of one or more of these genes can be known at the same time by the length of the amplification product (FIG. 1).
The size of the amplified product can be determined by gel electrophoresis or capillary electrophoresis, and the position and type of the mutation can be analyzed (FIG. 2).
Preferably, the R region of the ASO probe and the LSO probe may be located on either side, or the R region may not be used. In all of these cases, the base sequence between the ASO probe and the LSO probe binding site (FIG. 3). In addition, the probe can be designed to detect a gene mutation (FIG. 3).
Wherein the detection probe is a base sequence comprising a base sequence region between an ASO probe and an LSO probe and has a nucleotide sequence complementary to the nucleotide sequence of the ASO probe and the LSO probe or a nucleotide sequence complementary to the nucleotide sequence at the 5 ' Real-time PCR is performed using a detection probe to which a fluorophore is attached, a quencher is added to the 3 'end, and the melting temperature of the probe is higher than the melting temperature of the PCR primer by 3 or more , It is possible to discriminate the object variation with a simple and high sensitivity.
In the present invention, genetic mutation analysis using a detection probe is performed by hybridizing fluorescence real-time PCR with a template nucleic acid sequence targeting a 5 'end with a fluorescent substance and a 3' end with a quencher, When the complementary strand is elongated from the primer by the action of a merase, the probe is decomposed to generate fluorescence, and the target sequence is detected and quantified based on the fluorescence intensity. That is, since the probe is specifically hybridized to the template DNA in the annealing step and the quenching material exists on the probe, generation of fluorescence is suppressed even when the excitation light is normally applied (FRET (fluorescence resonance energy transfer) phenomenon) , And when the probe hybridized to the template is decomposed by the 5'3 'exonuclease activity of the DNA polymerase in the subsequent elongation reaction step, the fluorescent dye is liberated from the probe, the inhibition by the extinction substance is released, . As such a probe, for example, a taxane (registered trademark) probe is used.
In the detection probe included in the probe set of the present invention, the 5 ' and 3 ' ends are labeled with a fluorescent dye having a negative charge such as the dye of the fluorescein family, or a neutral charge Or a fluorescent dye having a positive charge such as the dye of the cyanine family can be used. The pigments of the fluorescein family include, for example, FAM, HEX, TET, JOE, NAN and ZOE. The Rhodamine family pigments include Texas Red, ROX, R110, R6G and TAMRA. FAM, HEX, TET, JOE, NAN, ZOE, ROX, R110, R6G and TAMRA are commercially available from Perkin-Elmer (Foster City, Calif.), Texas Red is available from Molecular Probes , Inc. (Eugene, OR). The pigments of the cyanine family include Cy2, Cy3, Cy5 and Cy7, which are commercially available from Amersham (Amersham Place, Little Chalfont, Buckinghamshire, England). Iwoa, DABCYL, and EDANS can also be used.
From among these materials, a combination of a fluorescent substance capable of causing FRET and a light extinction substance can be appropriately selected and used. For example, FAM is most efficiently excited by light with a wavelength of 488 nm and emits light with a spectrum of 500 to 650 nm and a radiation maximum of 525 nm. FAM is a suitable donor label for use with, for example, TAMRA as a quencher with a maximum excitation of 514 nm. A combination of FAM and Iowa can also be used.
The detection probe is a base sequence including a mutation site, and has a nucleotide sequence comprising a desired nucleotide at the mutation site, or a nucleotide sequence complementary to the nucleotide sequence. Here, the term "target mutation" refers to a base to be detected. For example, in the case where A is specifically detected when the base of the mutation site is A or G, the detection probe has a base of the mutation site of A T in the case of complementary printing). The length of the detection probe may be a length capable of hybridizing specifically to the target sequence, but is preferably a sequence of 15 to 18 bases.
The Tm predictive value of the detection probe is preferably 70 to 80 캜, particularly 70 to 76 캜, more preferably 74 to 76 캜. The reaction temperature and the annealing temperature are preferably 60-65 ° C, and the Tm of the primer DNA is preferably positioned in the middle (+ 5 ° C, 65-70 ° C).
As the primer, two types of primer (sense primer) which hybridize to the 5'-side of the region where the probe is hybridized in the target nucleic acid and 3'-side primer (antisense primer) which hybridizes to the 3'-side are used. One can hybridize to the sense single stranded nucleic acid of the target gene and the other to the antisense single stranded nucleic acid and amplify the region between the two primers by PCR. It is preferable that the primer is set in a region reserved in the target nucleic acid. It is also preferable to set the amplification region at a position capable of amplifying a region of 100 to 250 nucleotides in length.
The length of the primer is preferably 15 to 25 bases, and it is practical that the Tm predicted by using the calculation formula of the oligonucleotide or DNA oligonucleotide is lower than the Tm of the detection probe and higher than the Tm predicted value of the counter probe, The Tm predicted value is preferably 60 to 69 占 폚, particularly preferably 65 to 69 占 폚. Primers for the target Tm predicted value can be designed using software such as Primer Express (Applied Biosystems).
The real-time PCR using the probe of the present invention can be carried out in a buffer containing the probe, the primer, the target nucleic acid as a template, the deoxyribonucleotide mixture (dNTP) and the thermostable DNA polymerase under conditions .
In order to exhibit the effect of the present invention, the annealing temperature in the PCR reaction is preferably 60 to 69 DEG C, and preferably lower than the Tm of the probe. Normally, the elongation reaction is carried out at a temperature higher than the annealing temperature, but the annealing and the elongation reaction may be performed at the same temperature.
The temperature cycle of the PCR can be detected by repeating a sufficient number of cycles to detect the target sequence and detecting the fluorescence based on the amplification with the fluorescence detector.
The method and kit for analyzing a gene using a probe used in the present invention include a step of preparing the ASO probe and the LSO probe, a nucleic acid containing the gene mutation, the hybridization of the ASO probe and the LSO probe to produce a partial double stranded nucleic acid Preparing the partial double-stranded nucleic acid with a complete double-stranded nucleic acid, PCR-amplifying the complete double-stranded nucleic acid with a universal PCR primer to prepare an amplification product, and analyzing the amplification product to determine the gene mutation Step and so on.
In the present invention, in the partial double-stranded nucleic acid formed by hybridization of the nucleic acid, the ASO probe and the LSO probe, if there is an extension region between the ASO probe and the LSO probe, a stretch reaction and a coupling reaction are performed to form a complete double- And a kit for analyzing a gene using the probe.
The method and kit for gene analysis using a probe as used herein include a nucleic acid comprising a target gene, hybridizing the ASO probe and the LSO probe to form a partial double-stranded nucleic acid, and forming the partial double- The step of preparing the nucleic acid may be carried out one or more times.
By analyzing the gene mutation, the frequency of occurrence of the wild type and mutation type of the mutation in the biological sample containing the mutation can be analyzed.
As used herein, "stretch region" refers to nucleotides of sufficient length to allow extension of the probe through nucleic acid polymerisation activity. The "stretch region" is present in some embodiments of the target and template nucleic acid. The "extension region ", if present, is between the upstream and downstream probes of the target or template nucleic acid. The "stretch region" is about 1 nucleotide to about 1000 nucleotides in length and a preferred range is about 1 to 100 nucleotides, more preferably 3 to 50 nucleotides, and most preferably 3 to 10 nucleotides in length.
The extension reaction refers to a reaction capable of catalyzing a reaction in which a nucleotide sequence is added at the 3-terminal of a primer by a DNA polymerase. After a specific length of the probe is complementarily bound to the target sequence, the 3 'end of the partial double strand formed at this time is subjected to a conventional elongation reaction based on the principle of addition of a common base by a DNA polymerase to a target sequence And a single strand is synthesized by the addition of a complementary base. Therefore, enzymes conventionally used in the art can be used without limitation as a DNA polymerase that induces the linkage of nucleic acids. The enzyme used in the elongation reaction may be selected from the group consisting of a DNA polymerase having no 5 'to 3' exonuclease activity of a general DNA polymerase.
The linking reaction refers to a reaction capable of catalyzing the linkage of a nucleotide sequence by a ligase. Two probes of a specific length are hybridized to the target sequence side by side. The nick sites of the double helix formed at this time are ligated to the 2 < RTI ID = 0.0 > It is a reaction that connects a probe of a species in a single stranded state. Therefore, enzymes conventionally used in the art can be used without limitation as a ligase for inducing the linkage of nucleic acids.
The enzyme used in the coupling reaction may be selected from the group consisting of E. coli DNA ligase, Taq DNA ligase, T4 DNA ligase and Ampligase ligase, but not limited thereto, DNA binding activity Can be used.
In addition, the elongation and ligation reaction can be performed in a single reaction using a plurality of probes recognizing a plurality of targets as well as a single target gene or mutation analysis. In this case, it is possible to select probes corresponding to respective mutation positions so that the error of the Tm value of the portion of each probe nucleotide sequence hybridized with the target gene is within 5.
The forward primer (P1 or P2) in the pair of PCR primers is composed of a heat sequence that completely complementarily binds to the base sequence of the region to which the PCR primer binds in the structure of the ASO probe, and may be preferably a universal PCR primer The length of the PCR primer can be determined according to the mutation of the target gene, and the size of the amplification product is used to terminate the hybridization reaction and determine the mutation. The universal PCR primer is a probe that is a base sequence commonly used for nucleotide sequencing or PCR, and has many commercial cloning vectors.
The universal PCR primer refers to an oligonucleotide ranging from 14 to 40 moles. The primer extension primer refers to an oligonucleotide having a length of 14 to 40 mers. The primer extension primer includes a nucleotide and a polymerase such as a DNA polymerase, Lt; / RTI > and pH conditions. Preferably, the primer is a deoxyribonucleotide and a single stranded nucleic acid. The primers used in the present invention may include dNMP (i.e., dAMP, dGMP, dCMP and dTMP), modified nucleotides or non-natural nucleotides. In addition, the primers may also include ribonucleotides.
The primer can be an extension primer that is annealed to the target nucleic acid and forms a sequence complementary to the target nucleic acid by the template-dependent nucleic acid polymerase, which is extended to the position where the immobilization probe is annealed to anneal the probe Occupies the site.
The extension primer comprises a complementary base sequence to the target gene at the 3-terminus. The term complementary means that under certain hybridization conditions the primer is sufficiently complementary to selectively hybridize to the target gene sequence and is meant to encompass both substantially complementary and perfectly complementary And preferably means completely complementary.
In the present specification, the terms used in connection with the primer sequence, the substantially complementary base sequence are not limited to the nucleotide sequence which is completely matched, but also the sequence of the base sequence to be compared with the reference sequence, It is also meant to include sequences that partially disagree.
The universal PCR primer should be long enough to be able to prime the synthesis of the extension product in the presence of the partial double strand. The suitable length of the primer is typically 15-30 nucleotides, depending on a number of factors, such as temperature and application. Short primer molecules generally require lower temperatures to form a sufficiently stable hybridization complex with the template. Hybridization or priming refers to the complementary binding of a probe to a template nucleic acid, and the complementary binding allows the polymerase to polymerize the probe to form a template nucleic acid or complementary nucleic acid molecule.
"Polymerase chain reaction" or "PCR" refers to a reaction to amplify a target nucleic acid molecule. A variety of amplification reactions have been reported in the art, including polymerase chain reaction (PCR) (US Pat. Nos. 4,683,195, 4,683,202 and 4,800,159), reverse-transcription polymerase chain reaction (RT-PCR) (Sambrook et al., Molecular Cloning. A Laboratory Manual, 3rd Ed. Cold Spring Harbor Press (2001)), multiplex PCR (McPherson and Moller, 2000), ligase chain reaction (LCR) (Stemmer, WP, et al., 1995 , Gap-LCR (WO 90/01069), repair chain reaction (EP 439,182), and Gap-LCR (Gene, 164, 49-53; CarLSO, B., 2008, Genet Eng Biotechn N, 28, Transcription-mediated amplification (TMA) (SantaLucia, J., 1998, Proc Natl Acad Sci USA, 95, 1460-1465.) Self- sustained sequence replication, a target polynucleotide sequence Selective amplification of target polynucleotide sequences (U.S. Patent No. 6,410,276), consensus sequence primer polymerase kinetics (U.S. Patent No. 4,437,975), an arbitrarily primed polymerase chain reaction (AP-PCR) (U.S. Patent Nos. 5,413,909 and 5,861,245), a nucleic acid base But are not limited to, nucleic acid sequence based amplification (NASBA) (US Pat. Nos. 5,130,238, 5,409,818, 5,554,517, and 6,063,603) and strand displacement amplification .
"Amplification product" means the product of a polynucleotide amplification reaction. That is, it is generally a polynucleotide population that is double-stranded and replicated from one or more start sequences. The one or more starting sequences may be one or more copies of the same sequence, or it may be a mixture of different sequences. The amplification product can be produced by a variety of amplification reactions, wherein the product of the amplification reaction is multiple copies of one or more target nucleic acids. Generally, the amplification reaction in which the amplification product is generated is "template-dependent" in that base pairing of the reactants that are either nucleotides or oligonucleotides has a complement in the template polynucleotides necessary for the production of the reaction products. The template-dependent reaction is oligonucleotide-linked reaction using primer extension or nucleic acid ligase using nucleic acid polymerase.
A "target nucleic acid" refers to a nucleic acid such as DNA or RNA that can be amplified by a PCR reaction and contains one or more base mutation sites. May be derived from human or non-human mammals, bacteria, yeasts, viruses, viroids, fungi, fungi, plants, or any other organism, or may originate from any recombinant source, . ≪ / RTI > Alternatively, the reaction may be carried out using a sample containing the target nucleic acid.
Herein, the term "sample" refers to a sample such as tissue or body fluid isolated from an individual, and includes, but not limited to, tissue biopsy material, plasma, serum, whole blood, sap, lymph, Urinary tract, tears, saliva, milk, blood cells, tumors, organs, and the like. A sample obtained from soil or drainage may also be used.
When the mutation of the virus is detected, the cDNA can be synthesized using the reverse transcriptase based on the RNA nucleic acid of the virus, and the amplification product of the obtained cDNA or cDNA can be used as the target nucleic acid.
The apparatus for analyzing a gene using a probe is characterized in that it is carried out through a gene analysis method using a probe. The sample processing apparatus for preparing a nucleic acid from a sample containing the gene, the ASO probe, the LSO probe and the nucleic acid are hybridized A module for preparing and amplifying complete double strands in the partially double-stranded nucleic acid formed, and a module for analyzing the amplified product.
In order to more efficiently measure the gene analysis method of the present invention, a sample processing apparatus for separating a nucleic acid from a sample containing a gene and an extension and connection of a partial double-stranded nucleic acid formed by hybridizing the nucleic acid, the ASO probe and the LSO probe A system for analyzing a gene using a probe comprising a module for preparing a double-stranded nucleic acid through a reaction and a module for analyzing the amplified product, the system comprising a mixing chamber, a dissolution chamber, and a sample processing unit And an amplifying device, and they may be integrated and operated.
Analysis of a sample that is believed to contain the gene of interest involves a series of sample preparation steps and is performed in a sample processing apparatus that mixes and dissolves. These steps may include filtration, cell lysis, nucleic acid and mixing with reagents.
Control of contamination of the sample preparation process may be useful to ensure confidence in the results of gene analysis. A method for preparing a sample for nucleic acid amplification reaction and verifying the effectiveness of the sample preparation is provided.
The method also includes subjecting the sample preparation control and the target entity, if present in the sample, to lysis treatment in a lysis chamber to purify the nucleic acid, exposing the nucleic acid liberated in the lysis chamber to hybridization, And analyzing the presence or absence of at least one nucleic acid marker for quality control. A positive analysis of the nucleic acid marker indicates that the sample preparation process was satisfactory, whereas the failure to analyze the nucleic acid marker indicates that the sample was improperly prepared.
The present invention provides an amplification apparatus for preparing a sample for gene mutation analysis and verifying the effectiveness of the sample preparation. The sample is considered to contain a target entity selected from the group consisting of cells, spores, microorganisms, and viruses, and the target entity comprises at least one gene. The apparatus includes a body having a first chamber for receiving a sample preparation control to be mixed with the sample. The sample preparation control is selected from the group consisting of cells, spores, microorganisms, and viruses, and the sample preparation control contains nucleic acid markers for quality control.
The apparatus further comprises an ultrasonic transducer coupled to a wall of the dissolution chamber to provide ultrasonic waves to the dissolution chamber. The apparatus may further comprise beads in the dissolution chamber to rupture the sample preparation control and the target entity.
A positive analysis of the quality control material indicates that the sample preparation process is satisfactory, while if the nucleic acid marker can not be analyzed, the sample is improperly prepared.
The method includes the step of allowing a sample mixed with the sample preparation control to flow through a chamber containing the solid phase material before the dissolution treatment to capture the sample preparation control and the target entity when present in the sample by the solid phase material .
The sample can be pre-filtered before mixing the sample with the sample preparation control. The dissolving treatment includes exposing the sample preparation control and the target entity to ultrasonic energy. The dissolution process also includes stirring the beads to rupture the sample preparation control and the target entity. Sample Preparation The control group is spores. The mixing step involves dissolving the dry beads containing the sample preparation control.
The dissolving treatment includes contacting with a chemical dissolving agent. The nucleic acid marker sequence is analyzed by amplifying the nucleic acid marker sequence and analyzing the amplified nucleic acid marker sequence. The nucleic acid marker sequence can be analyzed by determining whether the signal of the nucleic acid marker sequence exceeds a threshold value.
The reaction mixture in the reaction chamber of the reaction vessel of the amplification device is exposed to nucleic acid amplification conditions. Amplification of an RNA or DNA template using a reaction is known (U.S. Patent No. 4,683,195; U.S. Patent No. 4,683,202; PCR Protocols: A Guide to Methods and Applications (Innis et al., 1990). Nucleic acid amplification of DNA involves repetition of the cycle consisting of thermally denaturing the DNA, annealing the two oligonucleotide primers to a sequence complementary to the DNA segment to be amplified, and extending the annealed primer by a DNA polymerase . The primer binds to the opposite strand of the target sequence while the DNA synthesis by the polymerase is oriented so as to proceed across the region between the primers, effectively doubling the amount of DNA segments. In addition, since the extension products are also complementary and capable of binding primers, each successive cycle substantially doubles the amount of DNA synthesized in the previous cycle. This leads to an exponential increase in the specific target segment at a rate of 2n per cycle (where n is the number of cycles).
Methods such as amplification and ligase chain reaction (LCR) can be used to directly amplify the nucleic acid sequence of the target DNA sequence directly from mRNA, cDNA, nucleic acid library or cDNA library. Isothermal amplification reactions are also known and can be used according to the methods of the present invention.
The amplification reaction is preferably carried out using a heat treatment equipment which heats and / or cools the reaction mixture in the reaction vessel to the temperature required for the amplification reaction. Such a thermal processing equipment may also include nucleic acid marker sequences of the sample preparation control and one or more analysis instruments for analyzing one or more target nucleic acid sequences for testing in the sample. Preferred heat treatment equipment (US Pat. No. 6,369,893; US Pat. No. 6,391,541) with an optical analyzer capable of inspecting the size of the amplification product for amplifying and analyzing the nucleic acid sequence in the reaction vessel can be used. There are also many other known methods suitable for the present invention to control the temperature of the reaction mixture and to analyze the nucleic acid sequence in this reaction mixture.
The fluid control device may be controlled by a computer according to a desired protocol.
Using a single valve can produce high manufacturing yields due to only one failure factor. The integration of the fluid control and treatment components allows obtaining a compact device (e.g., in the form of a small cartridge) and facilitating automation of molding and assembly. As discussed above, such systems may advantageously include dilution and mixing capabilities, intermediate cleaning capabilities, and reliable pressurization capabilities. The fluid path in the system is typically closed to minimize contamination of the fluid in the system and to facilitate its reception and control. The reaction vessel is conveniently separable and interchangeable, and is discardable in some embodiments.
Examples of viruses for detecting mutant viruses include Ebola virus, human immunodeficiency virus (HIV), influenza virus, hepatitis C virus (HCV), and hepatitis B virus (HBV).
When the base mutation is a mutation likely to be a disease, the base mutation can be determined by the method of the present invention to predict the disease to a disease. Further, when the base mutation is a mutation related to side effects of the drug, side effects of the drug can be predicted by determining the base mutation by the method of the present invention.
When the gene mutation is a mutation specific to a species or a strain, a species or a state can be specified by determining the mutation of the gene by the method of the present invention. In addition, if a species or a state to be identified is a species or a state having a hospital, or a species or a state having a drug resistance, detection of pathogens and hospital viruses and detection of drug resistance can be performed.
SNPs are exemplified for the Ebola virus, among which the present invention is preferably used for the detection of the mutations exemplified in Table 1.
The embodiments of the present invention presented below are provided for illustrative purposes only and are not intended to limit the scope of the present invention. Many aspects of the invention, which fall within the scope of the appended claims, are believed to be obvious to those skilled in the art by reference to the above text and the following examples.
EXAMPLES 1. Preparation of Ebola Virus Nucleic Acids
The nucleic acid of Ebola virus was prepared by organically synthesizing 2,000-nt single-stranded nucleic acid from 5,500 to 7,500 sites including SNPs to be analyzed on the basis of Ebola viral nucleic acid (NCBI Reference Sequence: KM233116 ) .
Example 2. Preparation of ASO probe and LSO probe
The ASO probe and LSO probe configuration, which are probes for analyzing Ebola virus SNP, refer to the above general formulas I and II.
Ebola virus, an RNA nucleic acid, has a very high incidence of genetic mutations and recently reported 395 SNPs, including 50 fixed nonsynonymous changes, including eight well-conserved positions in Ebola virus (Gire, SK., Goba, A., et al., Genomic surveillance elucidates Ebola virus origin and transmission during the 2014 outbreak. Science, 2014 DOI: 10.1126 / science.1259657).
The nucleotide sequence position was determined as 18,926 bp (NCBI Reference Sequence: KM233116) of the total nucleic acid of Zaire ebolavirus isolate (H.sapiens-wt / SLE / 2014 / ManoRiver-NM042.1). The ASO probes and LSO probes for the analysis of the SNPs of 6175, 6909 and 7044 of the entire nucleic acid positions of the gene related to GP (Glycoprptein) gene of Ebola virus were prepared and used as shown in Table 3.
The ASO probe and the LSO probe for analyzing the SNP at positions 6175, 6909, and 7044 related to GP of Ebola virus, and the nucleic acid having the target gene, the ASO probe and the LSO probe were hybridized, elongated and ligated, Size of synthesized amplification product The ASO probe and LSO probe were prepared in Bioneer (Korea) and used for the experiment.
EXAMPLES 3. Renal and connective responses
In this example, 0.5 ng of the PCR product obtained in Example 1 was mixed with 0.5 pmole ASO probe and LSO probe (Biona, Korea), 0.5 U AmpLigase (Epicenter, USA), 2 U Platinum Tfi Exo Polymerase (Invitrogen, USA), 1 mM dNTP, and 1x AmpLigase buffer, and the reaction was carried out at 95 ° C for 5 minutes and at 60 ° C for 5 minutes for 5 times. The reaction mixture was denatured at 94 ° C for 1 minute and stored at 37 ° C.
That is, a nucleic acid containing a gene to be analyzed, the ASO probe and the LSO probe are subjected to a stretch reaction on a partial double-stranded nucleic acid formed by a hybridization reaction, followed by a coupling reaction to bind the ASO probe and the LSO probe, Stranded nucleic acid, and PCR amplified with a template.
Example 4. PCR amplification product analysis using capillary electrophoresis
0.08 μl of the universal PCR forward primer (
Capillary electrophoresis was performed using the ABI 3130XL Genetic Analyzer (36-cm capillary array and POP7 polymer; Applied Biosystems, Foster City, CA, USA) according to the protocol provided. 0.7 uL of the PCR reaction was mixed with 9 uL of Hi-Di formamide and 0.3 μl of GeneScan 500 ROX Size Standard (Applied Biosystems), reacted at 80 for 2 min, and then placed on ice. Samples were injected into the capillary and applied for 15 seconds at a voltage of 1.6 kV, followed by electrophoresis at 60 kV and electrophoresis voltage of 10 kV.
FIG. 4 is a graph showing the result of performing PCR after hybridization, elongation, and ligation reaction using the Ebola virus analyzing probe according to an embodiment of the present invention, and analyzing the amplified products using CE-SSCP . The probe for Ebola virus analysis according to the present invention showed a single peak for all of the mutation positions 6175, 6909 and 7044 of the gene. The target nucleic acid was 18926 bp (NCBI (SEQ ID NO: 1)) of the entire nucleotide sequence of H.sapiens-wt / SLE / 2014 / ManoRiver-NM042.1, which is a Zaire ebolavirus isolate Ebola virus, with a position 6175 SNP of 146 bp, a position 6909 SNP of 128 bp and a position 7044 SNP of 165 bp Reference Sequence: KM233116).
Example 5. PCR amplification product analysis using qPCR and detection probe
0.08 μl of the universal PCR forward primer (
FAM probe 6175
5 '(FAM) -CCACAAA TCAATTGAGA TCAGTTGG-3' (Iowa)
The reaction apparatus was a prism 7900HT (Applied Biosystems, Foster City, CA, USA). It can be seen that the SNP at position 6175 can be specifically detected.
While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. It is therefore intended that the scope of the invention be defined by the claims appended hereto and their equivalents.
Claims (16)
A site including the ASO probe and a site including a base sequence for directing gene mutation to the LSO probe and complementary base sequences of a universal PCR primer; And
Characterized in that said gene mutation is analyzed as a result of amplification and / or ligation reaction with said target nucleic acid, said ASO probe, LSO probe and universal PCR primer, Genetic analysis methods and kits.
Hybridizing the ASO probe with the LSO probe to form a partial double-stranded nucleic acid;
Preparing the partial double-stranded nucleic acid as a complete double-stranded nucleic acid;
PCR of the complete double-stranded nucleic acid with the universal PCR primer to produce an amplification product; And
Analyzing the amplification product to determine the gene mutation;
And a kit for analyzing a gene using the probe.
Preparing the partial double-stranded nucleic acid as a complete double-stranded nucleic acid;
And performing one or more of the following steps.
A reagent for connecting the ASO probe to the LSO probe; And
A kit for gene analysis using a probe, comprising the ASO probe and the LSO probe.
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