散发型DMD/BMD家系突变分析及产前诊断研究

目的 分析散发型DMD/BMD家系中患者的致病突变,为部分家系的胎儿进行产前基因诊断,明确该类家庭中女性成员是否致病突变携带者,分析该类家系新发突变的比例.方法 共收集30个散发DMD/BMD家系,应用传统mPCR方法 分析DMD基因缺失热区中的18个外显子;应用MLPA方法,对家系中的30例患者及23个家系中的28位女性成员,进行DMD基因全部79个外显子的定量分析,并为其中19个家系进行20例产前诊断.结果 mPCR检测到19例缺失突变;MLPA检测到21例缺失突变和3例重复突变,并明确缺失突变范围.在检测到突变的家系中,10例母亲为缺失突变携带者,2例为重复突变携带者,9例母亲不是携带者,新发突变比例为37.5%.7例患者的姐妹中5例为携带者(3例缺失,2例莺复),2例不是携带者.经产前诊断,12例男性胎儿中5例为患者,8例女性胎儿中2例为携带者.结论 MLPA方法 可全面检测DMD基因缺失及重复突变、明确女性携带者,为产前诊断提供准确信息.     

散发型DMD/BMD家系突变分析及产前诊断研究

目的 分析散发型DMD/BMD家系中患者的致病突变,为部分家系的胎儿进行产前基因诊断,明确该类家庭中女性成员是否致病突变携带者,分析该类家系新发突变的比例.方法 共收集30个散发DMD/BMD家系,应用传统mPCR方法 分析DMD基因缺失热区中的18个外显子;应用MLPA方法,对家系中的30例患者及23个家系中的28位女性成员,进行DMD基因全部79个外显子的定量分析,并为其中19个家系进行20例产前诊断.结果 mPCR检测到19例缺失突变;MLPA检测到21例缺失突变和3例重复突变,并明确缺失突变范围.在检测到突变的家系中,10例母亲为缺失突变携带者,2例为重复突变携带者,9例母亲不是携带者,新发突变比例为37.5%.7例患者的姐妹中5例为携带者(3例缺失,2例莺复),2例不是携带者.经产前诊断,12例男性胎儿中5例为患者,8例女性胎儿中2例为携带者.结论 MLPA方法 可全面检测DMD基因缺失及重复突变、明确女性携带者,为产前诊断提供准确信息.     

染色体微阵列分析在单纯不良孕产史孕妇产前诊断中的应用

目的:通过分析因单纯不良孕产史行产前诊断的孕妇染色体微阵列分析（chromosomal microarray analysis, CMA）异常检出情况,探讨CMA在单纯不良孕产史孕妇中应用的注意事项。方法:2014年6月至2020年7月共有5 563例孕妇在南京大学医学院附属鼓楼医院行CMA产前诊断,其中单纯因"不良孕...     

多重荧光定量PCR方法检测X-连锁鱼鳞病家系女性携带者

目的 分析一个汉族x-连锁鱼鳞病家系中类固醇硫酸酯酶(STS)基因的致病突变,明确家系中3名女性可能携带者身份,并比较不同方法在STS基因缺失突变检测中的应用.方法 采用普通PCR方法,对家系巾男性先证者进行STS基因10个外显子的扩增,明确是否存在缺失.采用多重荧光定量聚合酶链反应(QF-Pen)方法对x-连锁鱼鳞病家系部分女性成员进行STS基因定量分析.并应用荧光原位杂交(FISH)技术进行验证.结果 普通PCR方法检测到先证者STS基因第1～10号外显子缺失;多重QF-PCR方法榆测到先证者母亲为STS基因缺失突变携带者,先证者妹妹及表妹均不存在该缺失.FISH检测结果与QF-PCR结果相同.结论 对于STS基因完全缺失型患者及女性携带者,多重QF-PCR和FISH两种方法均能有效检测,但多重QF-PCR方法对STS基因缺失的检测操作方便、自动化程度高、检测通量高.     

不同扩增方法和探针长度对植入前单个卵裂球比较基因组杂交检测结果的影响

Objective To investigate the effect of different amplification methods and probes with various length on the results of comparative genomic hybridization (CGH) analysis of pre-implanted single blastomere and to establish the basis for preimplantation genetic diagnosis.Methods Twenty blastomeres of embryo at 6-8 cells stage were randomly divided into A and B group with 10 in each.Twenty peripheral blood lymphocytes from a healthy man were similarly divided into C and D group with 10 in each.Degenerate oligonucleotide primed polymerase chain reaction (DOP-PCR) was used to amplify whole genomic DNA in group A and C,and multiple displacement amplification (MDA) was used in group B and D for whole genome amplification (WGA).The specificity of resultant products was confirmed by amplification of TBX1 gene exon 2.CGH was performed respectively with 250-750 bp and 750-2000 bp probes prepared from the amplified whole genomic DNA.The result of CGH was verified by sex-determining region of Y (SRY).Results (1) Nine of the 10 samples in group A and all in group C were amplifiable by DOP-PCR,but there were multiple non-specific bands in the amplification of TBX1 exon 2 when WGA products were used as templates.When 250～750 bp probe was used in CGH,1 of the 5 blastomeres was failed and another one had different karyotype from that analyzed by SRY.(2) All samples in group B and D were successfully amplified by MDA,and the non-specific bands were significantly less in the amplification of TBX1 exon 2.All 5 blastomeres were successful in CGH with the 250～750 bp probe.Moreover,the karyotype was in agreement with that of SRY.(3) When 750 ～ 2000 bp probe was used,the CGH results were suboptimal.Conclusions In WGA of single blastomere,MDA is superior to DOP-PCR in the stability and specificity.The karyotype image detected by CGH with the 250～750 bp probe is clear and homogenous.