Bartter syndrome is a group of autosomal recessive renal tubular disorders;it has two types of presentation:antenatal and classic.The antenatal type presents as severe unexplained polyhydramnios in the second trimeste...Bartter syndrome is a group of autosomal recessive renal tubular disorders;it has two types of presentation:antenatal and classic.The antenatal type presents as severe unexplained polyhydramnios in the second trimester.This is due to fetal urinary losses of sodium,chloride,and potassium,leading to fetal polyuria.The classic type presents in the late neonatal or infancy stage,with dehydration,dyselectrolytemia,failure to thrive,and nephrocalcinosis.Antenatal scans are normal in such cases.Type I and II Bartter syndrome presents in the antenatal period,whereas type IV has a classic presentation.We describe an unusual case of type IVa Bartter syndrome presenting in the antenatal period,with severe polyhydramnios.The initial diagnosis was made based on amniotic fluid chloride levels and later confirmed by performing a genetic test.Genetic testing is important for confirming diagnosis and prognostication regarding the condition.展开更多
目的:采用聚合酶链反应技术(PCR),对短串联重复序列(short tandem repeat,STR)进行分析,探讨应用短串联重复序列信息进行21三体产前诊断的可行性。方法:选取21号染色体核心区域21q22.1-22.3及其附近的三个STR(D21S1409,D21S1433,D21S144...目的:采用聚合酶链反应技术(PCR),对短串联重复序列(short tandem repeat,STR)进行分析,探讨应用短串联重复序列信息进行21三体产前诊断的可行性。方法:选取21号染色体核心区域21q22.1-22.3及其附近的三个STR(D21S1409,D21S1433,D21S1444),用聚合酶链技术,非变性聚丙烯酰胺凝胶电泳,硝酸银染色技术,对30例正常人外周血及40例羊水样品进行分析。结果:30例正常人在三个STR位点均没有发现三条带。40例羊水样品中检测到三例21三体胎儿,两例与细胞染色体分析结果相符,染色体核型均为"47,XY,+21"。一例为21号染色体关键区域微片段重复,细胞染色体分析结果为"46,XY"。三例21三体和部分21三体多余的染色体和部分片段均来自母亲。其余37例羊水样品检测结果为阴性,细胞染色体分析结果也是阴性。D21S1409、D21S1433、D21S1444三个基因座的杂合度分别为:0.75、0.80、0.78。结论:三个STR均具有高度多态性,在21三体的产前诊断中有较高的应用价值。展开更多
目的:建立快速产前诊断唐氏综合征的方法。方法:以唐氏综合征关键区域内的STR(Short tandem repeat,STR)作为遗传标记,采用荧光定量PCR的方法扩增外周血和胎儿羊水标本STR位点,同时与细胞遗传学分析结果比较,评价荧光定量PCR快速诊断方...目的:建立快速产前诊断唐氏综合征的方法。方法:以唐氏综合征关键区域内的STR(Short tandem repeat,STR)作为遗传标记,采用荧光定量PCR的方法扩增外周血和胎儿羊水标本STR位点,同时与细胞遗传学分析结果比较,评价荧光定量PCR快速诊断方法的特异性和灵敏度。结果:细胞遗传学分析确诊的68例正常核型和32例唐氏综合征标本中,荧光定量PCR快速诊断结果均与染色体核型分析结果一致。其中正常核型的STR位点杂合体样本扩增产物显示为双峰,各位点的峰面积比值分别是D21S111.1～1.2;D21S14111.3～1.5;D21S20391.0～1.1;STR位点纯合体样本的扩增产物显示为单峰。而唐氏综合征患者的样本STR位点扩增产物可显示为1∶1∶1的三个峰,或者典型的2∶1的双峰,此类双峰的峰面积比值分别为D21S111.4～1.9;D21S14111.5～2.0;D21S20391.3～1.6。正常组和病例组的峰面积比值经秩和检验差异有显著意义(P<0.01)。结论:荧光定量PCR具有快速、特异性高、可标准化操作等优点,适宜于快速诊断唐氏综合征。展开更多
文摘Bartter syndrome is a group of autosomal recessive renal tubular disorders;it has two types of presentation:antenatal and classic.The antenatal type presents as severe unexplained polyhydramnios in the second trimester.This is due to fetal urinary losses of sodium,chloride,and potassium,leading to fetal polyuria.The classic type presents in the late neonatal or infancy stage,with dehydration,dyselectrolytemia,failure to thrive,and nephrocalcinosis.Antenatal scans are normal in such cases.Type I and II Bartter syndrome presents in the antenatal period,whereas type IV has a classic presentation.We describe an unusual case of type IVa Bartter syndrome presenting in the antenatal period,with severe polyhydramnios.The initial diagnosis was made based on amniotic fluid chloride levels and later confirmed by performing a genetic test.Genetic testing is important for confirming diagnosis and prognostication regarding the condition.
文摘目的:采用聚合酶链反应技术(PCR),对短串联重复序列(short tandem repeat,STR)进行分析,探讨应用短串联重复序列信息进行21三体产前诊断的可行性。方法:选取21号染色体核心区域21q22.1-22.3及其附近的三个STR(D21S1409,D21S1433,D21S1444),用聚合酶链技术,非变性聚丙烯酰胺凝胶电泳,硝酸银染色技术,对30例正常人外周血及40例羊水样品进行分析。结果:30例正常人在三个STR位点均没有发现三条带。40例羊水样品中检测到三例21三体胎儿,两例与细胞染色体分析结果相符,染色体核型均为"47,XY,+21"。一例为21号染色体关键区域微片段重复,细胞染色体分析结果为"46,XY"。三例21三体和部分21三体多余的染色体和部分片段均来自母亲。其余37例羊水样品检测结果为阴性,细胞染色体分析结果也是阴性。D21S1409、D21S1433、D21S1444三个基因座的杂合度分别为:0.75、0.80、0.78。结论:三个STR均具有高度多态性,在21三体的产前诊断中有较高的应用价值。
文摘目的:建立快速产前诊断唐氏综合征的方法。方法:以唐氏综合征关键区域内的STR(Short tandem repeat,STR)作为遗传标记,采用荧光定量PCR的方法扩增外周血和胎儿羊水标本STR位点,同时与细胞遗传学分析结果比较,评价荧光定量PCR快速诊断方法的特异性和灵敏度。结果:细胞遗传学分析确诊的68例正常核型和32例唐氏综合征标本中,荧光定量PCR快速诊断结果均与染色体核型分析结果一致。其中正常核型的STR位点杂合体样本扩增产物显示为双峰,各位点的峰面积比值分别是D21S111.1～1.2;D21S14111.3～1.5;D21S20391.0～1.1;STR位点纯合体样本的扩增产物显示为单峰。而唐氏综合征患者的样本STR位点扩增产物可显示为1∶1∶1的三个峰,或者典型的2∶1的双峰,此类双峰的峰面积比值分别为D21S111.4～1.9;D21S14111.5～2.0;D21S20391.3～1.6。正常组和病例组的峰面积比值经秩和检验差异有显著意义(P<0.01)。结论:荧光定量PCR具有快速、特异性高、可标准化操作等优点,适宜于快速诊断唐氏综合征。
