The invention discloses a time-of-flight
mass spectrometry
nucleic acid analysis method for detecting human
spinal muscular atrophy gene mutation. A primer combination comprising an amplification primer and a
mass spectrometry extension probe primer is utilized. According to the method, the copy numbers of sequences related to SMN1, SMN2, NAIP, H4F5 and GTF2H2 genes are quantitatively detected, and whether deletion, deletion number and multiple copies exist or not is analyzed, so that the
clinical phenotype severity can be directly deduced; the method has good sensitivity, specificity, stability and accuracy, and effectively solves the technical
bottleneck of false negative, false positive and the like; the operation is simple, the cost is relatively low, and the result is stable and reliable; the method is high in flux and low in cost, has general representativeness and universality, is easy to realize automatic and large-scale detection, and is suitable for large-scale
population screening;
genetic typing detection can be carried out on part of common SMN1 upper point mutations; and the requirements of large-scale
population screening,
prenatal diagnosis and conventional molecular diagnosis in current SMA prevention and treatment are met.