Spinal muscular atrophy （SMA） is a common Pautosomal recessive neuromuscular disorder （1in 6000 to 10 000 births） caused by mutations in the SMN1 gene at 5q13. More than 90%-98% of SMA patients show homozygous del...Spinal muscular atrophy （SMA） is a common Pautosomal recessive neuromuscular disorder （1in 6000 to 10 000 births） caused by mutations in the SMN1 gene at 5q13. More than 90%-98% of SMA patients show homozygous deletion of SMN1, which has proved to be useful in the diagnosis of SMA. But it is hampered because of the existence of a highly homologous gene, SMN2. Based on nucleotide mismatches between SMN1 and SMN2, the following two DNA tests are usually performed： single-strand conformational polymorphism （SSCP） and polymerase chain reaction （PCR） followed by a restriction enzyme digestion.In this study we developed a new method for rapid genetic diagnosis of SMA by denaturing high-performance liquid chromatography （DHPLC）, which is based on different retention of homoduplexes and heteroduplexes in detecting the homozygous deletion of SMN1. Both genetic and prenatal diagnoses were performed successfully for a SMA family by DHPLC, which was confirmed as a rapid and effective technique for detecting the deletion of SMN1.展开更多
目的探索微滴式数字PCR（droplet digital PCR，ddPCR）技术在脊肌萎缩症（spinal muscular atrophy，SMA）的致病基因SMN1第7外显子拷贝数的检测和产前诊断中的应用。方法应用ddPCR技术和常规的多重连接依赖性探针扩增技术同时对56个SM...目的探索微滴式数字PCR（droplet digital PCR，ddPCR）技术在脊肌萎缩症（spinal muscular atrophy，SMA）的致病基因SMN1第7外显子拷贝数的检测和产前诊断中的应用。方法应用ddPCR技术和常规的多重连接依赖性探针扩增技术同时对56个SMA家系共138例样本（其中产前诊断样本17例）行SMN1基因第7外显子拷贝数的检测，并对二者的结果进行比较。结果ddPCR技术检测结果同多重连接依赖性探针扩增技术检测结果一致率为100％，其中SMN1第7外显子拷贝数为2的样本25例，拷贝数为1的样本84例，拷贝数为0的样本29例。结论ddPCR技术对于SMN1基因拷贝数的检测是准确、快速、经济的，可满足SMA临床基因检测和产前诊断的需求。展开更多
目的分析脊肌萎缩症（spinal muscularatrophy，SMA）患者运动神经元存活基因（survial motor neuron1，SMN1突变情况，了解SMNl基因缺失在SMA患者各亚型的分布及其对诊断的意义。方法应用多重连接依赖式探针扩增法对78例SMA患者及其父...目的分析脊肌萎缩症（spinal muscularatrophy，SMA）患者运动神经元存活基因（survial motor neuron1，SMN1突变情况，了解SMNl基因缺失在SMA患者各亚型的分布及其对诊断的意义。方法应用多重连接依赖式探针扩增法对78例SMA患者及其父母的SMN1进行突变检测。结果89．7％（70／78）的患者SMN1基因突变类型为第7、8外显子纯合缺失；3．8％（3／78）的患者为SMN1基因第7外显子纯合缺失、第8外显子杂合缺失；3．8％（3／78）的患者为SMN1基因第7外显子纯合缺失，未检测到第8外显子缺失；另有2．6％（2／78）的患者为SMN1基因第7、8外显子杂合缺失；对78例患者父母SMN1基因进行突变检测，发现77例患者父母均为相应基因突变携带者，符合SMA常染色体隐性遗传的特点。而1例SMN1基因第7、8外显子纯合缺失的SMA1型患者，母亲为SMN1第7和8外显子杂合缺失，父亲SMN1基因未检测到缺失和重复。结论SMA患者中SMN1基因纯合缺失达95％以上，使基因分析辅助临床诊断成为可能。在纯合缺失患者中，未见单独第8外显子的纯合缺失，提示分析SMN1基因第7外显子的纯合缺失更具有诊断意义。展开更多
基金This study was supported by grants from National 863 Program (No. 2002BA711A07-08) and National 973 Program (No.2001CB510302).
文摘Spinal muscular atrophy （SMA） is a common Pautosomal recessive neuromuscular disorder （1in 6000 to 10 000 births） caused by mutations in the SMN1 gene at 5q13. More than 90%-98% of SMA patients show homozygous deletion of SMN1, which has proved to be useful in the diagnosis of SMA. But it is hampered because of the existence of a highly homologous gene, SMN2. Based on nucleotide mismatches between SMN1 and SMN2, the following two DNA tests are usually performed： single-strand conformational polymorphism （SSCP） and polymerase chain reaction （PCR） followed by a restriction enzyme digestion.In this study we developed a new method for rapid genetic diagnosis of SMA by denaturing high-performance liquid chromatography （DHPLC）, which is based on different retention of homoduplexes and heteroduplexes in detecting the homozygous deletion of SMN1. Both genetic and prenatal diagnoses were performed successfully for a SMA family by DHPLC, which was confirmed as a rapid and effective technique for detecting the deletion of SMN1.
文摘目的探索微滴式数字PCR（droplet digital PCR，ddPCR）技术在脊肌萎缩症（spinal muscular atrophy，SMA）的致病基因SMN1第7外显子拷贝数的检测和产前诊断中的应用。方法应用ddPCR技术和常规的多重连接依赖性探针扩增技术同时对56个SMA家系共138例样本（其中产前诊断样本17例）行SMN1基因第7外显子拷贝数的检测，并对二者的结果进行比较。结果ddPCR技术检测结果同多重连接依赖性探针扩增技术检测结果一致率为100％，其中SMN1第7外显子拷贝数为2的样本25例，拷贝数为1的样本84例，拷贝数为0的样本29例。结论ddPCR技术对于SMN1基因拷贝数的检测是准确、快速、经济的，可满足SMA临床基因检测和产前诊断的需求。
文摘目的分析脊肌萎缩症（spinal muscularatrophy，SMA）患者运动神经元存活基因（survial motor neuron1，SMN1突变情况，了解SMNl基因缺失在SMA患者各亚型的分布及其对诊断的意义。方法应用多重连接依赖式探针扩增法对78例SMA患者及其父母的SMN1进行突变检测。结果89．7％（70／78）的患者SMN1基因突变类型为第7、8外显子纯合缺失；3．8％（3／78）的患者为SMN1基因第7外显子纯合缺失、第8外显子杂合缺失；3．8％（3／78）的患者为SMN1基因第7外显子纯合缺失，未检测到第8外显子缺失；另有2．6％（2／78）的患者为SMN1基因第7、8外显子杂合缺失；对78例患者父母SMN1基因进行突变检测，发现77例患者父母均为相应基因突变携带者，符合SMA常染色体隐性遗传的特点。而1例SMN1基因第7、8外显子纯合缺失的SMA1型患者，母亲为SMN1第7和8外显子杂合缺失，父亲SMN1基因未检测到缺失和重复。结论SMA患者中SMN1基因纯合缺失达95％以上，使基因分析辅助临床诊断成为可能。在纯合缺失患者中，未见单独第8外显子的纯合缺失，提示分析SMN1基因第7外显子的纯合缺失更具有诊断意义。
