Background： Duchenne muscular dystrophy （DMD） and Becker muscular dystrophy （BMD） are common X-linked recessive neuromuscular disorders caused by mutations in dystrophin gene. Multiplex polymerase chain reaction ...Background： Duchenne muscular dystrophy （DMD） and Becker muscular dystrophy （BMD） are common X-linked recessive neuromuscular disorders caused by mutations in dystrophin gene. Multiplex polymerase chain reaction （multiplex PCR） and multiplex ligation-dependent probe amplification （MLPA） are the most common methods for detecting dystrophin gene mutations, This study aimed to contrast the two methods and discern the genetic characterization of patients with DMD/BMD in Eastern China. Methods： We collected 121 probands, 64 mothers ofprobands, and 15 fetuses in our study. The dystrophin gene was detected by multiplex PCR primarily in 28 probands, and MLPA was used in multiplex PCR-negative cases subsequently. The dystrophin gene of the remaining 93 probands and 62 female potential carriers was tested by MLPA directly. In fetuses, multiplex PCR and MLPA were performed on 4 fetuses and 10 fetuses, respectively. In addition, sequencing was also performed in 4 probands with negative MLPA. Results： We found that 61.98% of the subjects had genetic mutations including deletions （50.41%） and duplications （11.57%）. There were 43.75% of mothers as carriers of the mutation. In 15 fetuses, 2 out of 7 male fetuses were found to be unhealthy and 2 out of 8 female fetuses were found to be carriers. Exons 3-26 and 45-52 have the maximum frequency in mutation regions. In the frequency ofexons individually, exon 47 and exon 50 were the most common in deleted regions and exons 5, 6, and 7 were found most frequently in duplicated regions. Conclusions： MLPA has better productivity and sensitivity than multiplex PCR. Prenatal diagnosis should be applied in DM D high-risk fetuses to reduce the disease incidence. Furthermore, it is the responsibility of physicians to inform female carriers the importance of prenatal diagnosis.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
基金This study was supported by grants from the National Natural Science Foundation of China （No. 81671117）, the Jiangsu Province Natural Science Foundation （No. BK20141439）, and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions （No. JXC 10231802）.
文摘Background： Duchenne muscular dystrophy （DMD） and Becker muscular dystrophy （BMD） are common X-linked recessive neuromuscular disorders caused by mutations in dystrophin gene. Multiplex polymerase chain reaction （multiplex PCR） and multiplex ligation-dependent probe amplification （MLPA） are the most common methods for detecting dystrophin gene mutations, This study aimed to contrast the two methods and discern the genetic characterization of patients with DMD/BMD in Eastern China. Methods： We collected 121 probands, 64 mothers ofprobands, and 15 fetuses in our study. The dystrophin gene was detected by multiplex PCR primarily in 28 probands, and MLPA was used in multiplex PCR-negative cases subsequently. The dystrophin gene of the remaining 93 probands and 62 female potential carriers was tested by MLPA directly. In fetuses, multiplex PCR and MLPA were performed on 4 fetuses and 10 fetuses, respectively. In addition, sequencing was also performed in 4 probands with negative MLPA. Results： We found that 61.98% of the subjects had genetic mutations including deletions （50.41%） and duplications （11.57%）. There were 43.75% of mothers as carriers of the mutation. In 15 fetuses, 2 out of 7 male fetuses were found to be unhealthy and 2 out of 8 female fetuses were found to be carriers. Exons 3-26 and 45-52 have the maximum frequency in mutation regions. In the frequency ofexons individually, exon 47 and exon 50 were the most common in deleted regions and exons 5, 6, and 7 were found most frequently in duplicated regions. Conclusions： MLPA has better productivity and sensitivity than multiplex PCR. Prenatal diagnosis should be applied in DM D high-risk fetuses to reduce the disease incidence. Furthermore, it is the responsibility of physicians to inform female carriers the importance of prenatal diagnosis.
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。
