XRCC2 gene mutation detection specific primers and liquid chip
A detection solution and specificity technology, applied in the field of molecular biology, can solve the problems of easy contamination of samples, complicated operation, high false positive rate, etc., and achieve the effect of avoiding uncertain factors, low cross-reaction rate and avoiding cross-reaction
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Embodiment 1
[0030] Example 1 XRCC2 gene mutation detection liquid chip mainly includes:
[0031] 1. ASPE Primers
[0032] Specific primer sequences were designed for wild-type and mutant types of four common genotypes of XRCC2 gene, G87A, G158C, A82G and A155C. ASPE primers consist of "tag sequence + specific primer sequence". ASPE primer sequences are shown in the table below:
[0033] Table 1 ASPE primer sequence of XRCC2 gene (tag sequence + specific primer sequence)
[0034]
[0035]
[0036] Each ASPE primer consists of two parts, the 5' end is a specific tag sequence for the anti-tag sequence on the corresponding microsphere, and the 3' end is a mutant or wild-type specific primer fragment (as shown in Table 1 above). All ASPE primers were synthesized by Shanghai Sangon Bioengineering Technology Service Co., Ltd. Each synthesized primer was prepared into a stock solution of 100 pmol / mL with 10 mmol / L Tris Buffer.
[0037] 2. Microspheres coated with anti-tag sequences
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Embodiment 2
[0049] Example 2 Detection of samples using the XRCC2 gene mutation detection liquid chip described in Example 1
[0050] The formula of described various solutions is as follows:
[0051] 50mM MES buffer (pH5.0) formula (250ml):
[0052]
[0053] 2×Tm hybridization buffer
[0054]
[0055] Store at 4°C after filtration.
[0056] ExoSAP-IT kit was purchased from US USB Company.
[0057] Biotin-labeled dCTP was purchased from Shanghai Sangon Bioengineering Technology Service Co., Ltd.
[0058] 1. Sample DNA extraction:
[0059] Refer to the relevant methods of DNA extraction in "Molecular Cloning" to obtain the DNA to be detected.
[0060] 2. PCR amplification of samples to be tested
[0061] 4 pairs of primers were designed, and multiplex PCR amplified 4 target sequences containing four common genotypes G87A and G158C, A82G and A155C of the XRCC2 gene in one step. The product sizes were 239bp, 397bp, 179bp and 317bp respectively. NO.25-32) see Table 3 above.
[0...
Embodiment 3
[0105] The liquid phase chip of embodiment 3 different ASPE primers detects the SNP site of XRCC2 gene
[0106] 1. Design of liquid phase chip preparation (selection of Tag sequence and Anti-Tag sequence)
[0107] Taking the XRCC2 gene G87A, G158C, A82G and A155C site mutation detection liquid chip as an example, the specific primer sequence of the 3' end of the ASPE primer was designed for the wild type and mutant type of G87A, G158C, A82G and A155C, respectively, and the ASPE primer 5 The Tag sequence at the 'end is selected from SEQ ID NO.1-SEQ ID NO.8. Correspondingly, the anti-tag sequence coated on the microsphere and complementary to the corresponding tag sequence is selected from SEQ ID NO.17-SEQ ID NO.24. The specific design is shown in the following table (Table 7). The synthesis of ASPE primers, microspheres coated with anti-tag sequences, amplification primers, detection methods, etc. are as described in Example 1 and Example 2.
[0108] Table 7 Design of liquid...
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