家族性良性天疱疮ATP2C1基因突变研究

目的 探讨家族性良性天疱疮5个散发病例的ATP2C1基因突变.方法 5例来自门诊的散发病例,采集外周血,提取基因组DNA,采用PCR和DNA直接测序的方法,检测5个散发家族性良性天疱疮患者的ATP2C1基因突变,在100例正常人对照中予以验证.结果在5例具有典型临床表现,经皮肤病理和免疫病理确诊的散发家族性良性天疱疮患者,检测到5个未曾报道的ATP2C1基因突变位点,包括1个缺失突变(2025delG),3个错义突变(L269R,C348R,A651D),和1个无义突变(Q259x).100例正常人对照中均未检测到上述突变.结论 发现家族性良性天疱疮新的ATP2C1基因突变位点.     

家族性良性天疱疮ATP2C1基因突变研究

目的 探讨家族性良性天疱疮5个散发病例的ATP2C1基因突变.方法 5例来自门诊的散发病例,采集外周血,提取基因组DNA,采用PCR和DNA直接测序的方法,检测5个散发家族性良性天疱疮患者的ATP2C1基因突变,在100例正常人对照中予以验证.结果在5例具有典型临床表现,经皮肤病理和免疫病理确诊的散发家族性良性天疱疮患者,检测到5个未曾报道的ATP2C1基因突变位点,包括1个缺失突变(2025delG),3个错义突变(L269R,C348R,A651D),和1个无义突变(Q259x).100例正常人对照中均未检测到上述突变.结论 发现家族性良性天疱疮新的ATP2C1基因突变位点.     

大疱及疱疹性皮肤病

20121985慢性家族性良性天疱疮两家系ATP2C1基因突变分析/许庆强(西安交大二附院皮肤科),程纯忠,霍佳…∥中国皮肤性病学杂志.-2012,26(6).-475～476,485对2例家族性良性天疱疮(HHD)家系ATP2C1基因中可能存在的突变进行鉴别。收集2个HHD家系和100份无亲缘关系正常人外周血标本,采用聚合酶链反应扩增ATP2C1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     

家族性良性慢性天疱疮ATP2C1基因突变检测

目的:检测家族性良性慢性天疱疮ATP2C1基因突变.方法:提取20例患者和100例健康对照者的外周血DNA,采用聚合酶链反应(PCR)扩增ATP2C1基因的全部外显子,用直接测序法进行DNA测序,检测ATP2C1基因突变.结果:20例患者中检测到9种突变,包括4种缺失突变(167或168de1C,2374delTTTG,2454delT,2558delTGGGACAATT),3种错义突变(I711R,Q737R,1580V),2种无义突变(R55X,R799X),健康对照者中未检测到上述突变.其中167或168de1C,2454delT,2558de1T-GGGACAATT,I711R,Q737R为新发现的突变位点.结论:家族性良性慢性天疱疮存在遗传异质性.     

一婴儿期发病的慢性家族性良性天疱疮家系ATP2C1基因突变研究

目的 对一慢性家族性良性天疱疮家系进行测序,寻找ATP2C1基因外显子上的突变点,丰富关于ATP2C1基因突变的信息。方法 提取一慢性家族性良性天疱疮家系中先证者及包括其父母、舅舅在内的家族中6名其他成员的外周血DNA进行测序,与人类基因组ATP2C1序列相比较找出突变点,另外测50例正常人血的ATP2C1基因,除外单核苷酸多态性。结果 家系中先证者、其舅舅及其母亲在ATP2C1的第9外显子上存在一杂合性的剪切突变,第699位缺失腺嘌呤（A）,导致其下游第12位的氨基酸序列出现终止密码TGA。反向测序亦证实该突变。该家系中先证者父亲、其他3名成员及50例正常人均未见该突变。结论 本研究慢性家族性良性天疱疮家系中先证者及其母亲及舅舅ATP2C1的第9外显子上存在一杂合性的剪切突变,突变来自于母系并向下遗传。     

一家族性良性天疱疮家系致病基因的研究

目的 为了解家族性良性天疱疮家系的基因突变方式，以及基因型与临床表型之间的关系。方法 获得临床确诊患者及其家族成员外周血白细胞基因组DNA，设计针对ATP2C1基因的一系列PCR引物，运用单链构象多态性(SSCP)原理筛查此家族性良性天疱疮家系基因突变，用DNA直接测序明确具体的突变位置和方式，分析基因突变的病理意义。结果 此家系存在ATP2C1基因突变，第2068-2076位“TGTAGCCAT”突变成“AGATGGAACA”，造成开放阅读框架移位，出现提前终止密码子，使其编码的蛋白质丢失了一个ATP结合位点和3个钙离子结合位点，丧失了他原有的功能而致病；此家系患者基因型与临床表型无明确关系。结论 ATP2C1基因第21外显子突变是引起本家系家族性良性天疱疮的原因。     

慢性家族性良性天疱疮两家系ATP2C1基因突变分析

目的对2例慢性家族性良性天疱疮(HHD)家系ATP2C1基因中可能存在的突变进行鉴别。方法收集2个HHD家系和100份无亲缘关系正常人外周血标本,采用聚合酶链反应方法扩增ATP2C1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ATP2C1基因检测到第17号外显子存在一个新的无义突变c.T1431A(p.C477X);家系2中所有患者第24外显子发现一个已报道的移码突变c.2374delTTTG(791LfsX9)。结论两个家系中存在ATP2C1基因的变异,导致编码蛋白的结构和功能发生改变。     

家族性良性天疱疮一家系报道及其ATP2C1基因筛查

目的 报道一个家族性良性天疱疮家系并对其致病基因ATP2C1进行突变筛查。方法 对先证者及其家族4代成员进行临床调查。采集每一成员静脉血标本,同时采集50例健康人血液标本作为对照。提取外周血基因组DNA,分别对 ATP2C1基因的所有28个外显子及其侧翼内含子序列进行PCR扩增,再对每一扩增产物进行直接测序,最后将测序结果分别与基因库（NM_014382.2和NC_000003.9）的编码序列和基因组序列进行逐一比对分析。结果 调查该家系4代24个成员,共有8例患者。基因筛查显示先证者和该家族其他患者的ATP2C1基因第17号外显子上发生一单核苷酸碱基置换,即c（1696C→T）;同时该家族中第2代、第3代正常成员和50例健康对照均未检测到这一碱基变化。第4代4个成员中,仅有1个成员,即Ⅳ3,亦检测到这一变化。结论 该家系患者ATP2C1基因发生c（1696C→T）无义突变,可能是家族性良性天疱疮的致病突变;Ⅳ3携带该突变,但到目前为止,其未发生家族性良性天疱疮的相关临床症状,有必要对其进行密切随访。     

家族性良性天疱疮患者ATP2C1基因突变研究

目的 探讨3个家族性良性天疱疮家系和1例散发患者的ATP2C1基因突变。方法 采取家系中患病成员外周血,应用外周血细胞DNA抽提、PCR扩增和DNA直接测序等方法检测ATP2C1基因突变情况,用反向测序验证突变,用100例无血缘关系个体作正常人对照。结果 在2个家族性良性天疱疮家系和1例散发患者中发现3个未曾报道的错义突变。家系1第20外显子2048位碱基G→A,导致错义突变R619K;家系2第8外显子853位碱基A→C,导致错义突变T221P;散发患者第23外显子2323位碱基T→C,导致错义突变Y711H。家系中非患病成员和100例无血缘关系正常人均未发现这些改变。在1个家族性良性天疱疮家系未检测到基因突变。结论 发现家族性良性天疱疮3种新的ATP2C1基因突变位点。     

家族性良性天疱疮ATP2C1基因突变研究

目的 探讨家族性良性天疱疮5个散发病例的ATP2C1基因突变。方法 5例来自门诊的散发病例,采集外周血,提取基因组DNA,采用PCR和DNA直接测序的方法,检测5个散发家族性良性天疱疮患者的ATP2C1基因突变,在100例正常人对照中予以验证。结果 在5例具有典型临床表现,经皮肤病理和免疫病理确诊的散发家族性良性天疱疮患者,检测到5个未曾报道的ATP2C1基因突变位点,包括1个缺失突变（2025delG）,3个错义突变（L269R,C348R,A651D）,和1个无义突变（Q259X）。100例正常人对照中均未检测到上述突变。结论 发现家族性良性天疱疮新的ATP2C1基因突变位点。     

Mutation analysis of ATP2C1 gene in Taiwanese patients with Hailey-Hailey disease

BACKGROUND: Hailey-Hailey disease (HHD) is an autosomal dominant disorder with recurrent eruption of vesicles and bullae involving predominantly the neck, groin and axillary regions. Histopathology shows suprabasal cleavage in epidermal cells. Recent studies have revealed that HHD is caused by mutations in the ATP2C1 gene encoding a novel Ca2+ pump. OBJECTIVES: To analyse the mutations of the ATP2C1 gene in Taiwanese patients with HHD. METHODS: In total, five familial and two sporadic cases of HHD were retrieved from the medical records. The diagnosis of HHD was made based on the characteristic clinical features and histopathological evidence. All 27 exons and flanking intron boundaries were amplified by polymerase chain reaction and products analysed by direct sequencing. RESULTS: We identified six novel mutations and one reported mutation: three deletion mutations (nt884-904del, 1459delCTCA, 1975delA), two non-sense mutations (R39X, R783X), one mis-sense mutation (A730T) and one splicing mutation (483 + 2T-->A). The non-sense mutation R39X had been reported previously; the other six mutations are novel mutations. CONCLUSIONS: These results demonstrate that a spectrum of ATP2C1 gene mutations is present in Taiwanese HHD patients.     

Novel mutation in ATP2C1 gene in a Japanese patient with Hailey-Hailey disease

Hailey-Hailey disease (HHD) is an autosomal dominant disorder with recurrent eruption of vesicles and bullae involving predominantly the neck, groin and axillary regions. Histopathology shows suprabasal cleavage in epidermal cells. Recent studies have revealed that HHD is caused by mutations in the ATP2C1 gene encoding a novel Ca(2+) pump. We analyzed mutations of the ATP2C1 gene in 2 Japanese patients with HHD. The diagnosis of HHD was made based on the characteristic clinical features and histopathological evidence. All 27 exons and flanking intron boundaries were amplified by polymerase chain reaction and products analyzed by sequencing. As a result, we identified a novel missense mutation (A1087G) in exon 13 of the ATP2C1 gene in a patient. This mutation led the amino acid change from Thrto Ala in the phosphorylation protein domain. Another patient showed no mutation of the gene. These results demonstrate that a spectrum of ATP2C1 gene mutations is present in Japanese HHD patients.     

Heterogeneous mutations of the ATP2C1 gene causing Hailey–Hailey disease in Hong Kong Chinese

Background Hailey–Hailey disease (HHD) is a rare autosomal dominant dermatosis. It causes suprabasilar acantholysis leading to vesicular and crusted erosions affecting the flexures. Mutation of ATP2C1 gene encoding the human secretory pathway Ca²⁺/Mn²⁺‐ATPase (hSPCA1) was identified to be the cause of this entity. Objective The aim of this study was to study the mutational profile of the ATP2C1 gene in Hong Kong Chinese patients with HHD. Methods Patients with the clinical diagnosis of HHD proven by skin biopsy were included in this study. Mutation analysis was performed in 17 Hong Kong Chinese patients with HHD. Results Ten mutations in the ATP2C1 gene were found. Six of these were novel mutations. The novel mutations included a donor splice site mutation (IVS22+1G>A); a missense mutation (c.1049A>T); two deletion mutations (c.185_188delAGTT and c.923_925delAAG); an acceptor splice site mutation (IVS21‐1G>C) and an insertion mutation (c.2454dupT). Conclusion The six novel mutations provide additions to the HHD mutation database. No hot‐spot mutation was found and high allelic heterogeneity was demonstrated in the Hong Kong Chinese patients.     

慢性家族性良性天疱疮发病机制的研究进展

Hailey-Hailey病(HHD),又称为慢性家族性良性天疱疮,是一种少见的常染色体显性遗传病,以表皮棘层松解为特征,具体发病机制尚不清楚。HHD由钙依赖性ATP酶基因遗传缺陷引起,该基因编码人类分泌途径钙离子转运ATP酶1型(SPCA1),在角质形成细胞内高度表达。本文就近年来有关HHD发病机制的研究进展进行综述,为今后该病相关研究提供理论基础。     

Detection and comparison of two types of ATP2C1 gene mutations in Chinese patients with Hailey–Hailey disease

The gene ATP2C1 is identified as the defective gene in Hailey–Hailey disease (HHD). The nonsense and missense are two common types of mutations and have ,respectively, been detected in many HHD patients. The aims of our study were to identify the pathogenic ATP2C1 abnormality in Chinese HHD patients, and to compare nonsense and missense mutations in vivo to provide further understanding of the molecular and the physiological basis of HHD. The nucleotide sequencing of the ATP2C1 gene was performed in HHD patients, unaffected family members and 100 unrelated individuals. Meanwhile, we detected and analyzed the clinical manifestations, the expression of ATP2C1 mRNA and hSPCA1 protein in the two types of mutations. Three heterozygous mutations were identified, including a previously reported nonsense mutation (R799X), two novel missense mutations (D644G) and (R417K). The results of comparisons between two types of mutations showed that the common clinical features, the similarly low-level expressions of ATP2C1 mRNA and hSPCA1 protein, but the ATP2C1 mRNA expression of nonsense mutation was lower than missense mutation and even less than half the level of normal people. Our findings expand the known spectrum of ATP2C1 mutations in HHD. We supported the haploinsufficiency theory as prevalent mechanism in both types of mutations, and believed that the differences of ATP2C1 mRNA expressions in peripheral blood may relate with the type of mutation and reflect the state of illness of patients.     

Two novel mutations of the ATP2C1 gene in Chinese patients with Hailey–Hailey disease

Hailey–Hailey disease (HHD; OMIM 169600) is an autosomal dominant blistering disease. Pathogenic mutations in ATP2C1 encoding the human secretory pathway Ca²⁺/Mn²⁺-ATPase protein 1 (hSPCA1) have been identified since 2000. The aim of this study was to report a Chinese pedigree and a sporadic case of HHD and to explore the genetic mutations. The Chinese pedigree and the sporadic case of typical HHD were subjected to mutation detection of ATP2C1. The 27 coding exons and their flanking sequences were amplified and sequenced. The heterozygous C to T transition at nucleotide 2753 in exon 26 and G to T transition at nucleotide 2090 in exon 21 of the ATP2C1 gene were identified in a pedigree and a sporadic case of HHD, respectively. The C2753T transition resulted in a novel nonsense mutation of glutamine codon (CAG) to a stop codon (TAG) at amino acid residue 865 (Q865X) and the G2090T transition resulted in a novel missense mutation of glycine condon (GGA) to Valine (GUA) at amino acid residue 645 (G645V) in hSPCA1. This study should be useful for genetic counseling and prenatal diagnosis for affected families and in expanding the repertoire of ATP2C1 mutations underlying HHD. This work was supported by grant from the Natural Science Foundation of China (30471564).     

Genetic diagnosis of Hailey–Hailey disease in two Chinese families: novel mutations in the ATP2C1 gene

Hailey–Hailey disease (HHD; OMIM 169600), is an autosomal dominantly inherited disorder characterized by suprabasal cell separation of the epidermis. Mutations in ATP2C1, which encodes the human secretory pathway Ca²⁺/ Mn² ± ATPase protein 1 (hSPCA1), have been identified as the pathogenic gene of HHD without evidence of genetic heterogeneity. In this study, the ATP2C1 gene was screened in two typical Chinese pedigrees with HHD, and two specific novel mutations of the ATP2CL gene were identified. Family 1 had a 16‐base deletion mutation c.1068–1083del16 and family 2 had a substitution mutation c.1982T>G (p.Met661Arg). DNA sequencing of the three descendants of the probands revealed that they all had the normal genotype, indicating that there had been no transmission of the mutation.     

Hailey-Hailey disease: identification of novel mutations in ATP2C1 and effect of missense mutation A528P on protein expression levels

ATP2C1, encoding the human secretory pathway Ca(2+)-ATPase (hSPCA1), was recently identified as the defective gene in Hailey-Hailey disease (HHD), an autosomal dominant skin disorder characterized by abnormal keratinocyte adhesion in the suprabasal layers of the epidermis. In this study, we used denaturing high-performance liquid chromatography to screen all 28 exons and flanking intron boundaries of ATP2C1 for mutations in 9 HHD patients. Nine different mutations were identified. Five of these mutations, including one nonsense, one deletion, two splice-site, and one missense mutation, have not been previously reported. Recently, functional analysis of a series of site-specific mutants, designed to mimic missense mutations found in ATP2C1, uncovered specific defects in Ca(2+) and/or Mn(2+) transport and protein expression in mutant hSPCA1 polypeptides. In order to investigate the molecular and physiological basis of HHD in the patient carrying missense mutation A528P, located in the putative nucleotide binding domain of the molecule, site-directed mutagenesis was employed to introduce this mutation into the wild-type ATP2C1 (hSPCA1) sequence. Functional analyses of HHD-mutant A528P demonstrated a low level of protein expression, despite normal levels of mRNA and correct targeting to the Golgi, suggesting instability or abnormal folding of the mutated hSPCA1 polypeptides. Analogous to conclusions drawn from our previous studies, these results further support the theory of haploinsufficiency as a prevalent mechanism for the dominant inheritance of HHD, by suggesting that the level of hSPCA1 in epidermal cells is critical.