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Method for detecting gene mutation genotyping based on Taqman-ARMS (Amplification Refractory Mutation System) technology and kit

A technology for technical detection and kits, applied in the fields of biotechnology and medicine, can solve the problems of easy contamination sensitivity, high cost, cumbersome procedures, etc., and achieve the effects of simple and fast operation, high safety, and pollution reduction.

Active Publication Date: 2014-12-17
JIANGSU MICRODIAG BIOMEDICINE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, one of the purposes of the present invention is to provide a method for detecting gene mutation typing based on Taqman-ARMS technology, which solves the problem of cumbersome, expensive, time-consuming, easy-to-pollution and low-sensitivity procedures for gene mutation typing in the prior art. question

Method used

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  • Method for detecting gene mutation genotyping based on Taqman-ARMS (Amplification Refractory Mutation System) technology and kit
  • Method for detecting gene mutation genotyping based on Taqman-ARMS (Amplification Refractory Mutation System) technology and kit
  • Method for detecting gene mutation genotyping based on Taqman-ARMS (Amplification Refractory Mutation System) technology and kit

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Embodiment 1

[0042] The human EGFR gene is located on chromosome 7 of the genome, the EGFR genomic DNA (Genebank: NG_007726.3), and the full-length cDNA encoding the EGFR gene is shown in SEQ ID No: 1. According to the missense mutation of EGFR gene mainly concentrated in exon 21, the sequence of exon 21 of EGFR gene is shown in SEQ ID No: 2, the mutation site mainly has 2573 missense mutations, that is, the 2573 position is changed from T to G ( Abbreviated as L858R).

[0043] According to the L858R mutation type, use Primer 5 to design ARMS primer pairs, make the missense mutation site at the last position of the 3' end of the upstream primer, and introduce mismatch mutation bases at the 1st, 2nd and 3rd positions upstream of the mutation site , the specific primers are shown in Table 1, and the downstream primer is: 5'-aaacaatacagctagtgggaaggc-3' (SEQ ID No: 3)

[0044] Table 1. ARMS upstream primer sequences

[0045] 3' mismatch position Upstream primer sequence (5'→3') ...

Embodiment 2

[0050] With the nucleotide sequences of SEQ ID No: 5 and SEQ ID No: 3 as primers, the positive control prepared in Example 1 was used as a template to carry out PCR, and the PCR buffer concentrations in the PCR reaction were 0.5×, 1×, 1.5×, 2× and 2.5×, the concentration of other components is the same (the final concentration of each component in the 20μL system is 0.25mM dNTP, 2.5mM MgCl 2 , 1U / reaction DNA polymerase, 250nM primers, 30ng template DNA and the rest water). The PCR reaction conditions were: pre-denaturation at 95°C for 5 minutes, one cycle; 40 cycles of amplification, deformation at 95°C for 20 seconds, annealing and extension at 60°C for 40 seconds; and finally cooling at 40°C for 15 seconds. The PCR amplification products were identified by electrophoresis, and the results were as follows: figure 2 shown. Depend on figure 2 It can be seen that the bands were amplified in the range of PCR buffer concentration gradient from 0.5× to 2.5×, and the result wa...

Embodiment 3

[0052] With the nucleotide sequences of SEQ ID No: 5 and SEQ ID No: 3 as primers and the positive control prepared in Example 1 as a template, MgCl 2 For PCR with different concentrations, the conditions of other components are the same (the final concentration of each component in the 20μL system is 1×PCR buffer, 0.25mM dNTP, 1U / reaction DNA polymerase, 250nM primer, 30ng template DNA, and the balance is water), MgCl 2 The concentrations were 1.5mM, 2.0mM, 2.5mM, 3.0mM and 3.5mM. The PCR reaction conditions are the same as in Example 2, and the amplified product is identified by electrophoresis, and the results are as follows: image 3 shown. Depend on image 3 It can be seen that in MgCl 2 The concentration in the range of 1.5mM~3.5mM can amplify the target band, when MgCl 2 It works best at a concentration of 2.0-2.5mM.

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Abstract

The invention discloses a method for detecting gene mutation genotyping based on a Taqman-ARMS (Amplification Refractory Mutation System) technology, relating to the field of molecular biology. According to the method, an ARMS mutation enrichment technology and a Taqman-MGB (Minor Groove Binder) specificity fluorescence detection technology are combined, a mutation target sequence is subjected to specificity PCR (Polymerase Chain Reaction) amplification by using an ARMS primer, a Taqman-MGB probe is used for carrying out specificity locus detection on an amplification product, and specific mutation is identified on the basis of Real-time PCR. Compared with mutation detection technologies such as direct sequencing, chip detection and the like, the method has the advantages of strong specificity, high sensitivity, simplicity and rapidness in operation, high flux and the like when used for detecting gene mutation.

Description

technical field [0001] The invention relates to the fields of biotechnology and medicine, in particular to a method for detecting gene mutation sites and typing based on Taqman-ARMS technology. Background technique [0002] Gene mutation detection methods commonly used at present are restriction fragment length polymorphism analysis (RFLP method) and direct DNA sequencing. The RFLP method is a method that combines PCR with restriction enzyme digestion, but this method has the following disadvantages: RFLP experimental operation is cumbersome, the detection cycle is long, the cost is high, there are false positives caused by incomplete first round of enzyme digestion, non-closed tube Operation, easy to contamination, difficult to meet clinical testing requirements. Direct DNA sequencing is the gold standard for mutation detection. This method has the following disadvantages: long detection cycle, high cost, non-closed tube operation, difficulty in avoiding cross-contaminati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12Q1/68
Inventor 王弢秦勇
Owner JIANGSU MICRODIAG BIOMEDICINE TECH CO LTD
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