遗传性对称性色素异常症两家系ADAR1基因新突变

目的:检测遗传性对称性色素异常症(DSH)2个家系ADAR1基因的突变.方法:收集DSH 2个家系患者的外周血标本,采用PCR结合DNA直接测序的方法,检测了2个家系成员中共5例患者、5例表型正常者和50例无亲缘关系健康个体ADAR1基因突变情况.结果:家系Ⅰ中患者ADAR1基因12号外显子第3159位碱基G缺失,即c...     

遗传性对称性色素异常症6个新的致病基因突变研究

目的：检测遗传性对称性色素异常症家系中ADAR1基因的突变。方法：收集遗传性对称性色素异常症8个家系成员及1个散发病例共31例患者及12例非患者的血样,应用PCR和直接测序法对其进行ADAR1基因检测。结果：在8个家系的患者和一个散发病例中,检测到7个不同的ADAR1基因突变位点,包括4个错义突变（p.K1105N,p.G1047A,p.F1099L,p.G1068R）、2个移码突变（p.Q779fs-792x,p.P441fs-463x）、1个无义突变（p.R1096x）。结论：在检测到的7个突变位点中,其中6个突变位点为首次报道。另有两个家系未发现突变位点。     

Identification of two novel DSRAD mutations in two Chinese families with dyschromatosis symmetrica hereditaria

Dyschromatosis symmetrica hereditaria (DSH) is a hereditary skin disease characterized by the presence of hyperpigmented and hypopigmented macules on face and dorsal aspects of the extremities that appear in infancy or early childhood. Genetic studies have identified mutations in the double-stranded RNA-specific adenosine deaminase (DSRAD) gene, encoding double-stranded RNA-specific adenosine deaminase, to be responsible for this disorder. Here, we report two novel mutations c.2116 G > A (E706K) and c.2848 C > T (Q950X) in the DSRAD gene identified in two Chinese pedigrees with DSH. This study should be useful for genetic counseling and prenatal diagnosis for affected families and in expanding the database on DSRAD gene mutations in DSH.     

Identification of two novel DSRAD mutations in two Chinese families with dyschromatosis symmetrica hereditaria

Dyschromatosis symmetrica hereditaria (DSH) is a hereditary skin disease characterized by the presence of hyperpigmented and hypopigmented macules on face and dorsal aspects of the extremities that appear in infancy or early childhood. Genetic studies have identified mutations in the double-stranded RNA-specific adenosine deaminase (DSRAD) gene, encoding double-stranded RNA-specific adenosine deaminase, to be responsible for this disorder. Here, we report two novel mutations c.2116 G > A (E706K) and c.2848 C > T (Q950X) in the DSRAD gene identified in two Chinese pedigrees with DSH. This study should be useful for genetic counseling and prenatal diagnosis for affected families and in expanding the database on DSRAD gene mutations in DSH.     

Six novel mutations of the ADAR1 gene in Chinese patients with dyschromatosis symmetrica hereditaria

BACKGROUND: Dyschromatosis symmetrica hereditaria (DSH) is a rare autosomal dominantly inherited dermatosis and characterized by a mixture of hyperpigmented and hypopigmented macules on the back of hands and feet. The DSH locus was mapped to chromosome 1q21 and subsequently pathogenic mutations were identified in the adenosine deaminase acting on RNA1 (ADAR1) gene in 2003. OBJECTIVE: In this study, we performed a mutation analysis of the ADAR1 gene in eight Chinese families and one sporadic patient with typical DSH. METHODS: PCR and direct sequencing of the ADAR1 gene were performed to identify and confirm the mutations in the eight families and the sporadic patient. RESULTS: Six novel and one known mutations were identified, including four missense mutations (p.K1105N, p.G1047R, p.F1099L, p.G1068R), two frameshift mutations (p.Q779fs-792x, p.P441fs-463x) and one nonsense mutation (p.R1096x). CONCLUSION: Six novel mutations were found in five unrelated families and one sporadic case, which have further improved our understanding on the role of ADAR1 in DSH. Interestingly, we failed to detect any mutations of ADAR1 in two families.     

遗传性对称性色素异常症三家系ADAR1基因突变检测

【摘要】 目的 探讨3个遗传性对称性色素异常症家系中ADAR1基因的突变情况。方法 收集血样,用PCR结合DNA直接测序的方法,检测3个家系中的患者、患者亲属及与家系无关的50例健康个体的ADAR1基因突变情况。 结果 所研究的3个家系中均存在ADAR1基因的异常。包括A及C家系中2个错义突变（c.1760A > G导致p.Y587C,c.3620G > T导致p.G1207V）,B家系中1个移码突变（c.2433-2434delAG）。3个家系中未患病个体和健康对照均未发现相应突变。 结论 3个ADAR1基因突变中,2个错义突变均为新突变,可能是导致遗传性对称性色素异常症发病的分子机制之一。     

Ten novel mutations of the ADAR1 gene in Japanese patients with dyschromatosis symmetrica hereditaria

Dyschromatosis symmetrica hereditaria (DSH) is a pigmentary genodermatosis of autosomal-dominant inheritance. We have reported 20 different mutations of the adenosine deaminase acting on RNA 1 gene (ADAR1) in patients with DSH since we had clarified that the disease is caused by a mutation of the ADAR1 gene in 2003. In this study, we report 10 novel mutations responsible for DSH: p.Q102fsX123, p.T369fsX374, p.S664fsX677, p.R892L, p.I913R, p.R916Q, p.P990fsX1016, p.C1081S, p.C1169F, and p.K1187X.     

遗传性对称性色素异常症两家系基因突变检测研究

目的:检测遗传性对称性色素异常症患者家系中腺苷脱氨酶(ADAR)基因的突变.方法:收集2个遗传性对称性色素异常症患者家系的临床资料,采用聚合酶链反应及直接测序法对家系内成员ADAR基因突变位点进行检测,同时对50名无血缘关系健康对照者的该位点进行直接测序.结果:在2个家系的患者中分别检测到2个不同的ADAR基因移码突变位点c.633insT和c.2742delC,而在家系内非患者及正常对照者中均未发现该2个突变.结论:该研究中2个遗传性对称性色素异常症家系中的患者存在ADAR基因的移码突变,且皆为首次报道.     

一例散发遗传性对称性色素异常症ADAR1基因新突变

目的: 对1例散发遗传性对称性色素异常症患者ADAR1基因中可能存在的突变进行检测。方法: 提取1例散发遗传性对称性色素异常症患者及其正常双亲和另外100份无亲缘关系正常人外周血DNA,采用聚合酶链反应方法扩增ADAR1基因的全部外显子及内含子侧翼序列并利用Sanger测序技术进行序列鉴定。结果: 患者ADAR1基因检测到第2号外显子存在一个新发的无义突变,即c．1162G>T,第388位密码子翻译终止,(P.E388X),导致该基因翻译的蛋白截短。其正常双亲及无亲缘关系对照外周血中均未发现此突变。结论: ADAR1基因c．1162G>T突变可能与该例患者DSH发病有关,为国内外首次报道。     

Mutational spectrum of the ADAR1 gene in dyschromatosis symmetrica hereditaria

Dyschromatosis symmetrica hereditaria (DSH) is a rare autosomal dominant cutaneous disorder characterized by a mixture of hyperpigmented and hypopigmented macules of various sizes on the extremities and caused by the mutations of adenosine deaminase acting on RNA1 (ADAR1) gene. We screened 14 unrelated families or sporadic cases for mutation in the full coding sequence of this gene. Eight novel heterozygous mutations of ADAR1 and four known mutations were identified, including four missense mutations (p.R26K, p.Y1192D, p.R916Q, p.R1155W), six frameshift mutations (p.N205fsX217, p.V211fsX217, p.V404fsX417, p.I914fsX927, p.L1053fsX1076, p.L1070fs1092), and two nonsense mutations (p.R474X, p.R1096X). Interestingly, we failed to detect any mutations of ADAR1 in one family. Including our data, there are now 93 different mutations reported in 105 independent patients that we have tabulated. From the review of clinical features in these reports, we found that the same mutation could lead to different phenotypes even in the same family and did not establish a clear correlation between genotypes and phenotypes. Finally this study is useful for functional studies of the protein and to define a diagnostic strategy for mutation screening of the ADAR1 gene.