X连锁少汗性外胚叶发育不良家系基因突变检测

目的:检测1例3月龄少汗性外胚叶发育不良男性患儿及其家族成员少汗性外胚叶发育不良(ED1)基因的突变.方法:提取家系成员白细胞中的DNA,设计引物特异扩增ED1基因的外显子及其侧翼区域并测序,与正常人的测序结果进行比较.结果:患儿ED1基因第466位碱基由胞嘧啶变为胸腺嘧啶,使翻译产物中相应的氨基酸由精氨酸变为半胱氨酸,即R156C.先证者母亲为杂合子,父亲未检测到突变.结论:R156C导致了X连锁少汗性外胚叶发育不良在该家系中的传递.     

X连锁无汗性外胚叶发育不良家系的基因突变检测

目的 鉴定X连锁无汗性外胚叶发育不良(EDA)家系的基因突变及其突变类型,为建立对该病的基因诊断与遗传咨询提供依据。方法 应用聚合酶链反应-单链构象多态性(PCR-SSCP)分析法,结合DNA测序,检测了汉族人X连锁EDA一家系的基因突变位点与突变方式。结果 EDA致病基因(EDA1基因)外显子1的PCR产物经SSCP分析显示,患者及其携带者母亲出现异常单链条带。DNA测序表明,先证者该基因外显子1的第404位碱基胞嘧啶C被鸟嘌呤G颠换,致使EDA蛋白跨膜区第54位组氨酸突变成谷胺酰胺(H54Q),其母亲同一位置碱基呈现C～G杂合双峰。结论 本EDA家系中患者EDA1基因外显子1存在错义突变(404C→G),这可能是导致EDA发病的分子机制之一。     

X连锁少汗性外胚层发育不良一家系EDA基因的突变

目的检测一X连锁少汗性外胚层发育不良家系的EDA基因突变。方法收集患者及其父母资料,提取外周血DNA,采用PCR扩增EDA基因编码区的全部外显子及其侧翼序列,PCR产物测序,明确突变位点。以50例无关健康人作对照。结果该家系患者第7号外显子第895位鸟嘌呤G突变成腺嘌呤A,使EDA编码的蛋白第299位氨基酸密码子GGC变成AGC,导致正常的甘氨酸被丝氨酸所代替。其母亲在相同位置的碱基出现G-A双峰,显示为杂合性携带者,其父亲及50例无关健康对照未见此改变。结论G299S可能是导致该X性连锁少汗性外胚层发育不良家系临床表型的原因。     

先天性大疱性鱼鳞病样红皮病角蛋白10的新发突变

目的: 检测1例先天性大疱性鱼鳞病样红皮病患者KRT1和KRT10基因突变.方法: 提取患者及其家人外周血DNA,PCR扩增KRT1和KRT10基因编码区的全部外显子及其侧翼序列并测序,以100名正常人作对照.结果: 该患者KRT10基因第1号外显子中的第466位碱基发生C→T杂合突变(c.C466T),导致其编码第156位氨基酸发生错义突变(p.R156C),患者父母、妹妹及正常对照均未发现该突变,提示其为新发突变.结论: KRT10基因的c.C466T错义突变可能为引起该患者临床表型的病因.     

X性连锁少汗性外胚层发育不良家系ED1基因突变检测

目的 探讨X性连锁少汗性外胚层发育不良(XLHED)家系中ED1基因突变。方法 收集2个X性连锁少汗性外胚层发育不良家系外周血标本;采用聚合酶链反应(PCR)结合DNA直接双向测序的方法。结果 家系1中ED1基因的第8个外显子下游与内含子8交界处存在一个新的剪接点缺失突变(IVS8+5 del G)。家系2中第9个外显子处存在一个错义突变(A959G)。这些突变未在两个家系的正常人及188例无关正常对照者中出现。结论 中国人ED1基因突变可引起XLHED,且IVS8+5del G为一个新的突变。     

有汗性外胚层发育不良一家系基因突变

目的 探讨有汗性外胚层发育不良家系的基因突变及突变类型，为建立本病的基因诊断与遗传咨询提供依据。方法 PCR及Sanger测序技术对有汗性外胚层发育不良家系先证者GJB6基因外显子进行突变鉴定，对可疑的变异位点， Sanger测序检测家系其他成员该位点变异情况。结果 基因检测结果表明，家系先症者GJB6基因错义突变c.31G〉A，该突变导致连接蛋白-30（connexin-30, CX-30）第11位氨基酸由甘氨酸变成精氨酸（p.G11R）。家系的患者均携带此变异，而家系表型正常的个体不携带此变异。结论 GJB6基因c.31G〉A（p.G11R）突变是该有汗性外胚层发育不良家系致病基因突变。     

少汗型外胚叶发育不良

目的:对一少汗型外胚叶发育不良家系进行基因突变检测并探索二氧化碳点阵激光治疗患儿毛发稀疏的疗效.方法:收集患儿及其家庭成员临床资料及外周血,用二代测序检测致病基因,对二代测序得到的结果进行Sanger测序验证.以剥脱性CO2点阵激光治疗患儿毛发稀疏.结果:基因检测发现患儿及其母亲EDA基因编码序列第1075位核苷酸发生...     

遗传性皮肤病

20 0 4 0 12 8　少汗性外胚叶发育不全 (HED)家系ED1基因的突变检测 /王莹 (北京大学口腔医院修复科 )…∥北京大学学报 .- 2 0 0 3,35 (4 ) .- 419～4 2 2对 3个少汗性外胚叶发育不全核心家系进行外周血基因组 DNA的提取。利用聚合酶链反应、DNA直接测序进行突变检测 ,进一步采用限制性内切酶酶切验证突变。结果 :3个家系中的每位患者均在 ED1基因外显子不同位点的单碱基错义突变 ,分别为 C4 12 G、A 12 0 1G和 C1375 T,其中前两个突变位点是国内外首次报道的。 ED1基因的单碱基突变是引起此 3个核心家系少汗性外胚叶发育不全的致…     

有汗性外胚叶发育不良一家系致病基因突变筛查

目的:寻找有汗性外胚叶发育不良家系GJB6、GJB2和CTSC突变基因.方法:抽提外周血DNA,PCR扩增GJB6、GJB2和CTSC基因编码区的所有外显子,扩增产物纯化后直接双向测序,并与基因组序列进行比对分析,查找有无突变.结果:候选基因编码区所有外显子均未发现突变.结论:GJB6、GJB2和CTSC基因编码区序列与本研究中有汗性外胚叶发育不良家系发病无关,致病基因待进一步研究.     

遗传性皮肤病

20 0 4 2 130　 X性连锁少汗性外胚层发育不良家系 ED 1基因突变检测 /陈建军 (合肥医大皮研所 )… //中华皮肤科杂志 .- 2 0 0 3,36 (10 ) .- 553～ 555收集 2个 X性连锁少汗性外胚层发育不良家系外周血标本 ,采用聚合酶链反应结合 DNA直接双向测序的方法检测。结果显示 ,家系 1中 ED1基因的第 8个外显子下游与内含子 8交界处存在一个新的剪接点缺失突变 (IVS8 5del G) ,家系 2中第 9个外显子处存在一个错义突变 (A959G)。这些突变未在两个家系的正常人及 188例无关正常对照者中出现。图 7表 1参 6　(邓翠霞 )2 0 0 4 2 131　遗传性…     

Molecular genetic analysis of consanguineous Pakistani families with autosomal recessive hypohidrotic ectodermal dysplasia

Hypohidrotic ectodermal dysplasia is an inherited disorder characterized by defective development of teeth, hairs and sweat glands. X-linked hypohidrotic ectodermal dysplasia is caused by mutations in the EDA gene, and autosomal forms of hypohidrotic ectodermal dysplasia are caused by mutations in either the EDAR or the EDARADD genes. To study the molecular genetic cause of autosomal recessive hypohidrotic ectodermal dysplasia in three consanguineous Pakistani families (A, B and C), genotyping of 13 individuals was carried out by using polymorphic microsatellite markers that are closely linked to the EDAR gene on chromosome 2q11-q13 and the EDARADD gene on chromosome 1q42.2-q43. The results revealed linkage in the three families to the EDAR locus. Sequence analysis of the coding exons and splice junctions of the EDAR gene revealed two mutations: a novel non-sense mutation (p.E124X) in the probands of families A and B and a missense mutation (p.G382S) in the proband of family C. In addition, two synonymous single-nucleotide polymorphisms were also identified. The finding of mutations in Pakistani families extends the body of evidence that supports the importance of EDAR for the development of hypohidrotic ectodermal dysplasia.     

A novel 22-bp deletion mutation in a Chinese family with X-linked hypohidrotic ectodermal dysplasia

X-linked hypohidrotic ectodermal dysplasia (XLHED) is the most common form of the ectodermal dysplasias characterized by an abnormal development of eccrine sweat glands, hair and teeth. Pathogenic mutations in the ED1 gene have been identified. In this family, a 22-bp deletion mutation of exon 8 in the ED1 gene was found in the affected members but not in the healthy individuals and 100 unrelated controls. We add new variant to the knowledge of ED1 mutations in XLHED.     

Recurrent mutations in functionally-related <Emphasis Type="Italic">EDA</Emphasis> and <Emphasis Type="Italic">EDAR</Emphasis> genes underlie X-linked isolated hypodontia and autosomal recessive hypohidrotic ectodermal dysplasia

Mutations in three functionally related genes EDA, EDAR and EDARDD have been reported to cause hypohidrotic ectodermal dysplasia (HED), which is characterized by sparse hair, reduced ability to sweat, and hypodontia. In few cases mutations in the EDA gene have been found to result in X-linked recessive isolated hypodontia. In the study, presented here, we have ascertained two large Pakistani families (A and B) with autosomal recessive form of hypohidrotic ectodermal dysplasia and X-linked recessive isolated hypodontia. Genetic mapping showed linkage of family A to EDAR gene on chromosome 2q11-q13 and family B to EDA gene on chromosome Xq12-q13.1. Subsequently, DNA sequencing of the coding regions of EDAR and EDA genes revealed previously described mutations. Sequence analysis identified a four base-pair splice-junction deletion mutation (c.718_721delAAAG) in EDAR gene in family A and a missense mutation (c.T1091C; p.M364T) in EDA gene in family B. Recurrence of mutations in EDAR and EDA genes in unrelated families is evocative of the dispersion of ancestral chromosome in different locality groups through common ancestors.     

A novel EDA gene mutation in a Spanish family with X-linked hypohidrotic ectodermal dysplasia

X-linked hypohidrotic ectodermal dysplasia (XLHED) is characterized by abnormal development of the hair, teeth, and sweat glands. It is caused by mutations in the EDA gene, which maps to the X chromosome and encodes a protein called ectodysplasin-A, a member of the tumor necrosis factor-related ligand family. Affected males typically exhibit all the typical features of HED, but heterozygous carriers may show mild to moderate clinical manifestations. We describe the case of a Spanish family in which a novel heterozygous c.733_734insGA mutation at the EDA gene was identified. It was located in exon 5 and consisted of a frame-shift mutation at codon 245, which gave rise to an abnormal protein with a premature stop codon after 35 residues. Genetic analyses in families with XLHED are useful for checking carrier status, but they also provide information for genetic counseling and prenatal diagnosis.     

A novel frameshift mutation of the EDA1 gene in a Chinese Han family with X-linked hypohidrotic ectodermal dysplasia

Hypohidrotic ectodermal dysplasia (HED) is a rare skin disease characterized by hypotrichosis, hypodontia and hypohidrosis. HED can be autosomal dominant, autosomal recessive or X-linked. However, X-linked HED (XLHED; OMIM 305100) is the most common form. Mutations within the EDA1 gene, which encodes ectodysplasin-A, are responsible for XLHED. In this study, we investigated the EDA1 gene in a Chinese Han family with XLHED, and found a novel 1-bp deletion mutation (c.952delG) in exon 9 of the EDA1 gene, which results in a frameshift and premature termination codon. This result suggests that the c.952delG mutation of the EDA1 gene is likely to be the disease-causing mutation for XLHED in this family. Our study adds new data to the worldwide knowledge of the molecular basis of XLHED.     

Mutations in the ED1 gene in Japanese families with X-linked hypohidrotic ectodermal dysplasia

X-linked hypohidrotic ectodermal dysplasia (XLHED; OMIM 305100) is characterized by sparse hair, abnormal teeth and decreased sweating as a result of abnormal development of the sweat glands. Mutations in the ED1 gene, which encodes ectodysplasin-A (EDA), are responsible for XLHED. Ectodysplasin-A, a ligand for the EDA receptor, plays an important role in epidermal morphogenesis. We identified ED1 mutations including three novel mutations by sequencing genomic DNAs from eight unrelated Japanese XLHED families. Data from all reported mutations revealed that codon 156 in the furin subdomain is the most frequent site of change in EDA.     

A novel 7-bp deletion mutation in a Taiwanese family with X-linked hypohidrotic ectodermal dysplasia

Hypohidrotic ectodermal dysplasia (HED) is found worldwide with an estimated incidence of 1 per 100,000 births. X-linked hypohidrotic ectodermal dysplasia (XLHED, OMIM 305100) is the most common form of the ectodermal dysplasias (ED), a rare group of hereditary diseases characterized by abnormal development of eccrine sweat glands, hair, and teeth. Heterozygous carriers of XLHED often manifest minor or moderate degrees of hypotrichosis, hypodontia, and hypohidrosis. ED1, the gene for XLHED encodes ectodysplasin A, which is a new member of the tumour necrosis factor family. The majority of mutations in XLHED are missense mutations, but one-fifth are insertion/deletions. Here we report a novel 7-bp deletion mutation (nt1242-1248) in exon 9 of the ED1 gene that results in a frameshift and premature stop codon (PTC + 38 amino acids). Mutation analysis in families with XLHED allows for genetic counselling, prenatal diagnosis and confirmation of carrier status.