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Simple and convenient method and process for detecting SMA by DNA sequencing

A technology of DNA sequencing and sequencing, which is applied in biochemical equipment and methods, microbial measurement/inspection, etc., and can solve problems such as cumbersome detection process and difficulty in mastering by ordinary medical units

Pending Publication Date: 2019-07-30
刘维亮 +3
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AI Technical Summary

Problems solved by technology

The detection process is cumbersome, and it is difficult for ordinary medical units to master

Method used

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  • Simple and convenient method and process for detecting SMA by DNA sequencing
  • Simple and convenient method and process for detecting SMA by DNA sequencing
  • Simple and convenient method and process for detecting SMA by DNA sequencing

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Embodiment Construction

[0011] We performed PCR amplification on SMN gene DNA inzygote 6-exon 8, and sequenced and analyzed the PCR amplification products, summed up and explored a simple method and process for DNA sequencing to detect SMA.

[0012] 1. PCR amplification

[0013] 1. Primer sequence and synthesis

[0014] Intrazygote 6-exon 8 of the SMN gene was amplified by PCR and synthesized by Invitrogen. The primer sequences, amplified fragments and annealing temperatures are shown in Table 1.

[0015] Table 1, primer conditions and products

[0016]

[0017] 2. PCR reaction system

[0018] The total reaction volume is 25 μl, including:

[0019]

[0020] Addition of autoclaved ddH 2 0 to 25.0 μl

[0021] The preparation of the PCR reaction system was performed on ice, and finally Taq DNA polymerase was added, mixed evenly and distributed.

[0022] 3. PCR reaction conditions

[0023] The PCR amplification conditions were pre-denaturation at 94°C for 7 minutes, 94°C for 45 sec, 56°C for...

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Abstract

The invention relates to a simple and convenient method and specific process for detecting SMA. The key point of the technical scheme is that DNA sequencing is carried out on SMN intron 6-exon 8 in the PCR products; if exons 7 and 8 of SMN1 are homozygous deletions, only homozygous peaks of +6T on exon 7 of SMN2 and +245A on exon 8 of SMN2 are found; the method can be used for screening the molecular background of the copy number of the same SMN2 and the phenotypic deviation of the SMA; the +6 position on the exon 7 and +245 position on exon 8 of SMN appear nesting peak; if the phenotype is normal, the subject is normal people; if the subject is a patient, the point mutation of SMN1 can be preliminarily screened. The main application is as follows: the gene level of 98.6 percent of patients can be determined; the molecular background of the same SMN2 copy number and SMA phenotypic deviation can be screened; the remaining few SMA patients with loss of heterozygosity and point mutation are able to screen for point mutations in SMN1. The method is very suitable for basic medical units and is beneficial to further research on the mechanism of the disease.

Description

technical field [0001] Medical Genetics Background technique [0002] Spinal muscular atrophy (SMA) is the most common autosomal recessive neuromuscular disease. The SMN1 gene is the SMA-determining gene, which can cause disease through its gene deletion and small mutations in the gene. There are two highly homologous genes in the SMN gene. copy, telomere copy (SMN1) and centromere copy (SMN2), SMN2 is a modifying gene, currently it is believed that exon 7 and / or exon 8 deletion mutation of SMN1 gene is the main cause of SMA, about 95% of patients with SMA types I-III have homozygous SMN1 exon 7 and / or exon 8 deletions. There are only 5 nucleotide differences between SMN1 and SMN2 genes, which are intron 6 (-45G→A), exon 7 (+6C→T), intron 7 (+100A→G, + 214A→G), exon 8 (+245G→A), in SMA individuals, polymerase chain reaction-restriction fragment length polymorphism (polymerase chain reaction restriction fragment length polymorphism, PCR-RFLP) was used in the past at home an...

Claims

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Application Information

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IPC IPC(8): C12Q1/6869
CPCC12Q1/6869C12Q2535/119C12Q2531/113
Inventor 刘维亮何志旭李芳
Owner 刘维亮
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