遗传性对称性色素异常症两家系DSRAD基因突变分析

目的对2例遗传性对称性色素异常症(DSH)家系DSRAD基因中可能存在的突变进行鉴定。方法收集的两个遗传性对称性色素异常症家系和100份无亲缘关系正常人外周血标本,采用聚合酶链反应(PCR)方法扩增DSRAD基因的全部外显子并测序,结果和Genbank中相应序列进行比对。结果家系1中所有患者DSRAD基因检测到第9外显子存在一个旧的错义突变c.G2747A,导致p.R916Q;在家系2所有患者第12外显子发现一个新的错义突变c.C3124T,导致p.R1042C。两家系中正常人及无亲缘关系对照均未发现突变。结论两家系中均存在DSRAD基因的变异,导致编码蛋白的结构和功能发生改变。     

遗传性对称性色素异常症一家系基因检测

目的 探讨遗传性对称性色素异常症(DSH)家系中双链RNA特异性腺苷脱氨酶(DSRAD)基因的突变.方法 收集患者临床资料,提取外周血DNA,PCR扩增DSRAD基因的全部外显子,并行DNA测序,以100例正常人作对照.结果 检测到家系中患者均存在DSRAD基因中第3076位碱基发生C→T的杂合突变,即c.3076C>T,对应1026位的精氨酸被色氨酸替代(p.R1026W),家系中未患病者及对照组正常人未发现相应突变.结论 发现p.R1026W错义突变是遗传性对称性色素异常症的致病基因的一个新突变,扩大DSH致病基因的突变谱.     

一个遗传性对称性色素异常症家系DSRAD基因剪接位点突变的鉴定

目的 鉴定遗传性对称性色素异常症家系DSRAD基因的突变。方法 收集遗传性对称性色素异常症1个家系成员的血样，提取基因组DNA，用PCR扩增结合直接测序的方法进行DSRAD基因的检测。在内含子区域检测到一个碱基替换后，进一步提取患者外周血RNA，行RT-PCR，直接测序后分析其异常剪接方式。结果 在该家系患者的11号内含子区域检测到1个非经典的剪接位点突变，（c.3021-2G > A），RT-PCR结果发现，12号外显子缺失，在13号外显子处发生移码突变。结论 DSRAD基因11号内含子区域剪接位点突变（c.3021-2G > A）造成mRNA的异常剪接，导致邻近的12号外显子缺失和13号外显子移码突变，从而引起该家系患者发病。     

两个遗传性对称性色素异常症家系的DSRAD基因剪切突变

目的研究两个遗传性对称性色素异常症(DSH)家系中的DSRAD基因突变情况。方法收集了2个遗传性对称性色素异常症家系的外周血标本,用聚合酶链反应(PCR)扩增DSRAD基因的全部外显子并测序,检测2个家系中的患者及正常人和100例无关正常人的DSRAD基因。结果家系1中所有患者的DSRAD基因第6号内含子与第7号外显子交界处检测到一新的c.2271-3AG剪切突变。家系2中所有患者的DSRAD基因第12号外显子与第12号内含子交界处检测到一新的c.3202+5GA剪切突变。2家系中的正常人及100例无关正常人未发现突变。结论 2个DSH家系患者均有DSRAD基因剪切部位突变,可能由此引起非正常的基因剪切,导致编码蛋白的结构和功能改变,致皮肤色素异常。     

遗传性对称性色素异常症一家系DSRAD基因的突变

目的检测一个遗传性对称性色素异常症家系中的DSRAD基因突变情况。方法收集了一个遗传性对称性色素异常症家系的外周血标本,用聚合酶链反应(PCR)扩增DSRAD基因的全部15个外显子并测序,检测家系中的患者及正常人和100例无关正常人的DSRAD基因。结果家系中所有患者的DSRAD基因存在外显子3的杂合缺失突变:c.1615delG。家系中的正常人及100例无关正常人未发现此突变。结论发现DSH家系患者DSRAD基因的一个新的突变。     

遗传性对称性色素异常症一家系DSRAD基因新突变

目的：检测遗传性对称性色素异常症家系中DSRAD基因的突变。方法：收集遗传性对称性色素异常症一家系成员的血样,PCR扩增DSRAD基因的全部外显子,并行DNA测序。以100例无家系背景,且无色素异常的成年人作对照。结果：该家系中的患者均存在DSRAD基因中第3463位碱基发生了C→T的杂合突变,可造成对应1155位的精氨酸被色氨酸替代,家系中非患病者及对照组正常人未发现相应突变。结论：DSRAD基因是遗传性对称性色素异常症的致病基因。     

遗传性对称性色素异常症一家系DSRAD基因的新突变

目的: 检测一遗传性对称性色素异常症(DSH)家系DSRAD基因的突变.方法: 收集该家系成员以及50名正常对照的血样抽提基因组DNA,PCR扩增DSRAD基因的全部外显子并进行DNA测序.结果: 患者DSRAD基因第六个外显子2253位碱基后发生了一个腺苷酸(A)的插入,使该插入之后的读框发生改变;家系中正常表型的成员和无血缘关系的50名正常对照均未发现此突变.结论: DSRAD基因新的插入突变是导致该家系发生遗传性对称性色素异常症的特异突变.     

遗传性对称性色素异常症一家系ADAR基因检测

目的：检测遗传性对称性色素异常症一家系的ADAR基因突变。方法：提取家系中患者、健康成员及无血缘健康对照人群外周血样DNA,PCR扩增ADAR基因外显子后测序。结果：该家系中患者均存在ADAR基因第2号外显子,第982位碱基突变（c.982C>T,p.R328X）,突变导致第328位的精氨酸被终止密码替代。家系中健康成员及健康对照人群未发现该突变。结论：该遗传性对称性色素异常症家系患者中的ADAR基因突变（c.982C>T,p.R328X）可能与发病有关。     

遗传性对称性色素异常症一家系基因突变研究

对一个遗传性对称性色素异常症家系的外周血标本,用聚合酶链反应(PCR)扩增DSRAD基因的全部外显子并测序,检测家系中的患者及正常人和100名无关正常人的DSRAD基因.家系患者的DSRAD基因第2外显子杂合插入突变,家系中的正常人及无关对照均无此改变.本研究中的DSH家系患者均存在DSRAD基因杂合突变,可能由此引起皮肤色素异常.     

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。     

遗传性对称性色素异常症DSRAD基因的一个新突变

目的检测遗传性对称性色素异常症(DSH)家系中的DSRAD基因突变情况,探讨DSH的基因型与表型的关系。方法收集2个DSH家系的临床资料,提取外周血DNA,应用PCR扩增DSRAD基因编码区的全部外显子及其侧翼序列并测序,分别检测2个家系中的患者及正常人,并选取50例无关正常人做对照。结果发现全部患者均存在DSRAD基因的杂合突变,家系1中所有患者的DSRAD基因第12内含子剪切位点突变c.3203-2AC(IVS12-2AC);家系2中所有患者的DSRAD基因缺失突变c.2433_2434delAG。但该两家系中的正常人及50例正常对照者未发现上述突变。结论此两个DSH家系中存在DSRAD基因的特异性突变,其可能使编码蛋白功能缺陷,导致皮肤色素异常。     

Novel mutations of the RNA-specific adenosine deaminase gene (DSRAD) in Chinese families with dyschromatosis symmetrica hereditaria

Dyschromatosis symmetrica hereditaria (DSH) is an autosomal dominant skin disorder. It is also called "reticulate acropigmentation of Dohi" or "symmetric dyschromatosis of the extremities". The DSH locus has recently been mapped to chromosome 1q21 and pathogenic mutations were identified in the DSRAD gene encoding double-stranded RNA-specific adenosine deaminase in Japanese patients with DSH. We report here two novel point mutations, Q513X(1537C>T) and R916W(2746C>T) in the DSRAD gene identified in two Chinese families, respectively. These data suggest that mutations in DSRAD were also associated with DSH in Chinese. This is the first report on DSRAD as the causative gene of DSH in the Chinese population.     

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.     

Five novel mutations of RNA-specific adenosine deaminase gene with dyschromatosis symmetrica hereditaria

Dyschromatosis symmetrica hereditaria (OMIM127400) is a rare autosomal dominant pigmentary genodermatosis caused by mutations in the RNA-specific adenosine deaminase (ADAR) gene. This study investigated 5 families and 3 sporadic patients with dyschromatosis symmetrica hereditaria in the Chinese Han population from Anhui province, China. By direct sequencing, 5 novel ADAR gene mutations (c.982C>T, c.1491insA, c.2568_2571delTAAC, c.2969C>G and c.3040G>T) and 3 mutations described previously (c.3203-2A>G, c.3247C>T and c.3286C>T) were identified, all of which were heterozygous. We reviewed a total of 48 mutations in the ADAR gene in patients with dyschromatosis symmetrica hereditaria by previous reports and speculated that the mutation hotspots on the ADAR gene might be located in exons 9-15. The tRNA-specific and double-stranded RNA adenosine deaminase domain is essential for the deaminase activity of the ADAR encoded protein.     

Mutations in the P2RY5 gene underlie autosomal recessive hypotrichosis in 13 Pakistani families

Background  Autosomal recessive hypotrichosis is a rare genetic irreversible hair loss characterized by sparse scalp hair, sparse to absent eyebrows and eyelashes, and sparse axillary and body hair. Affected male individuals have normal beard hair.
Objectives  To search for pathogenic mutations in the human P2RY5 gene in Pakistani families with autosomal recessive hereditary hypotrichosis.
Methods  In the present report, 16 unrelated consanguineous Pakistani families having multiple affected individuals with autosomal recessive hypotrichosis were investigated. Linkage in these families was searched by genotyping microsatellite markers linked to autosomal recessive hypotrichosis loci LAH1, LAH2 and LAH3. Thirteen of the families showed linkage to the LAH3 locus on chromosome 13q14.11–q21.32. These families were then subjected to direct sequencing of the P2RY5 gene, which encodes a G protein-coupled receptor.
Results  Sequence analysis of the P2RY5 gene revealed two novel missense mutations (c.742A>T; p.N248Y and c.830C>T; p.L277P) in three families. Five previously described mutations including three missense (c.188A>T; p.D63V, c.436G>A; p.G146R, c.562A>T; p.I188F), one insertion (c.69insCATG; p.24insHfsX52) and one complex deletion (c.172–175delAACT; 177delG; p.N58–L59delinsCfsX88) were detected in the other 10 families.
Conclusions  Mutations revealed in the present study extend the body of evidence implicating the P2RY5 gene in the pathogenesis of human hereditary hair loss.     

Identification of two novel mutations in Chinese patients with 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. Pathogenic mutations in the DSRAD gene have recently been identified. In this study, we report and identify the mutations of the DSRAD gene in two Chinese pedigrees with DSH. Two novel mutations in the functional domains of the DSRAD gene were identified and verified in two pedigrees. The c.3244A>G (H1075R) mutation was found in all patients but not in the healthy individuals from family A and c.3335_3336delAT (Y1112fs→1112X) mutation was found in three patients but not in the healthy family members from family B. Our data suggests that these two novel mutations in the DSRAD gene could cause DSH and add new variants to the repertoire of DSRAD mutations in DSH. Ming Li and Chengrang Li contributed equally to this work.