Spinal muscular atrophy （SMA） is a disorder characterized by degeneration of lower motor neurons and occasionally bulbar motor neurons leading to progressive limb and trunk paralysis as well as muscular atrophy. Thr...Spinal muscular atrophy （SMA） is a disorder characterized by degeneration of lower motor neurons and occasionally bulbar motor neurons leading to progressive limb and trunk paralysis as well as muscular atrophy. Three types of SMA are recognized depending on the age of onset, the maximum muscular activity achieved, and survivorship： SMA1, SMA2, and SMA3. The survival of motor neuron （SMN） gene has been identified as an SMA determining gene, whereas the neuronal apoptosis inhibitory protein （NAlP） gene is considered to be a modifying factor of the severity of SMA. The main objective of this study was to analyze the deletion of SMN1 and NAIP genes in southern Chinese children with SMA. Here, polymerase chain reaction （PCR） combined with restriction fragment length polymorphism （RFLP） was performed to detect the deletion of both exon 7 and exon 8 of SMN1 and exon 5 of NAIP in 62 southern Chinese children with strongly suspected clinical symptoms of SMA. All the 32 SMA1 patients and 76% （13/17） of SMA2 patients showed homozygous deletions for exon 7 and exon 8, and all the 13 SMA3 patients showed single deletion of SMNI exon 7 along with 24% （4/17） of SMA2 patients. Eleven out of 32 （34%） SMA1 patients showed NAIP deletion, and none of SMA2 and SMA3 patients was found to have NA1P deletion. The findings of homozygous deletions ofexon 7 and/or exon 8 ofSMN1 gene confirmed the diagnosis of SMA, and suggested that the deletion ofSMN1 exon 7 is a major cause of SMA in southern Chinese children, and that the NAIP gene may be a modifying factor for disease severity of SMAI. The molecular diagnosis system based on PCR-RFLP analysis can conveniently be applied in the clinical testing, genetic counseling, prenatal diagnosis and preimplantation genetic diagnosis of SMA.展开更多
基金Project supported by the National Natural Science Foundation of China (No. J0710043)the Natural Science Foundation of Zheji-ang Province (No. 2007C33049), China
文摘Spinal muscular atrophy （SMA） is a disorder characterized by degeneration of lower motor neurons and occasionally bulbar motor neurons leading to progressive limb and trunk paralysis as well as muscular atrophy. Three types of SMA are recognized depending on the age of onset, the maximum muscular activity achieved, and survivorship： SMA1, SMA2, and SMA3. The survival of motor neuron （SMN） gene has been identified as an SMA determining gene, whereas the neuronal apoptosis inhibitory protein （NAlP） gene is considered to be a modifying factor of the severity of SMA. The main objective of this study was to analyze the deletion of SMN1 and NAIP genes in southern Chinese children with SMA. Here, polymerase chain reaction （PCR） combined with restriction fragment length polymorphism （RFLP） was performed to detect the deletion of both exon 7 and exon 8 of SMN1 and exon 5 of NAIP in 62 southern Chinese children with strongly suspected clinical symptoms of SMA. All the 32 SMA1 patients and 76% （13/17） of SMA2 patients showed homozygous deletions for exon 7 and exon 8, and all the 13 SMA3 patients showed single deletion of SMNI exon 7 along with 24% （4/17） of SMA2 patients. Eleven out of 32 （34%） SMA1 patients showed NAIP deletion, and none of SMA2 and SMA3 patients was found to have NA1P deletion. The findings of homozygous deletions ofexon 7 and/or exon 8 ofSMN1 gene confirmed the diagnosis of SMA, and suggested that the deletion ofSMN1 exon 7 is a major cause of SMA in southern Chinese children, and that the NAIP gene may be a modifying factor for disease severity of SMAI. The molecular diagnosis system based on PCR-RFLP analysis can conveniently be applied in the clinical testing, genetic counseling, prenatal diagnosis and preimplantation genetic diagnosis of SMA.
