Detection kit and method for copy number of spinal muscular atrophy pathogenic gene SMN1 based on real-time fluorescence quantitative PCR (Polymerase Chain Reaction) technique

Abstract

The invention discloses a detection kit and a method for copy number of spinal muscular atrophy pathogenic gene SMN1 based on a real-time fluorescence quantitative PCR (Polymerase Chain Reaction) technique. The detection kit comprises specific primers SMN1-F (SEQ ID NO.1) and SMN1-R (SEQ ID NO.2) modified by NO.7 exon locked nucleic acid of a pair of target genes SMN1, an SMN1 detection probe (SEQID NO.3), an SMN2 gene closed probe SMN2-B (SEQ ID NO.4) modified by SMN-P locked nucleic acid and 3'end C3Spacer, gene primers ALB-F (SEQ ID NO.5) and ALB-R (SEQ ID NO.6) of a reference gene ALB andan ALB detection probe ALB-P (SEQ ID NO.7). The amplification specificity and amplification efficiency of the SMN1 gene are enhanced by using locked nucleic acid modification; a stable reaction system for double amplification of the target genes and the reference gene is established by using a multi-PCR principle and optimizing reaction systems and conditions, and further quantitative accuracy and reliability of the copy number of the SMN1 can be ensured; good repeatability and high operability are obtained.

Description

technical field [0001] The invention belongs to the technical field of in vitro nucleic acid detection, and specifically relates to a detection kit and method for the copy number of the spinal muscular atrophy pathogenic gene SMN1 based on real-time fluorescent quantitative PCR technology. Background technique [0002] Spinal muscular atrophy (SMA) is an autosomal recessive neuromuscular disease characterized by nuclear degeneration of the anterior horn motor neurons of the spinal cord and brainstem motor neurons, and is the second most common fatal disease Autosomal recessive genetic disease, the incidence rate is about 1 / 6000-1 / 10000, and the carrier rate in the population is about 1 / 35-1 / 50. [0003] Studies have shown that motor neuron survival genes (Survival of MotorNeuron, SMN) located on chromosome 5, including SMN1 at the telomere end and SMN2 at the centromere end, are closely related to the occurrence and development of SMA. Among them, the gene defect of SMN1 is...

AI Technical Summary

Problems solved by technology

However, similar to MLPA, most current real-time fluorescent quantitative PCR techniques only design primers or probes for the specific site c.840C of the SMN1 gene, and the specificity of only one specific site for the amplification product or indicator probe cannot be guaranteed For general primers, when the copy numbers of the target gene SMN1 and the pseudogene SMN2 or the internal reference gene are greatly different, or when the amount of each product in the first PCR reaction is greatly different, there may be an advantage in amplification and the amplification of the target gene SMN1 or the internal reference gene Increased efficiency produces a large difference, resulting in abnormal results

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