弥漫性表皮松解性掌跖角化病两家系突变分析

目的: 检测弥漫性表皮松解性掌跖角化病两家系中KRT9基因的突变情况。方法: 收集各家系患者的临床资料,抽取家系患者、正常人及200名健康志愿者外周血并提取DNA,采用聚合酶链式反应(PCR)扩增KRT9基因全部外显子并进行sanger测序。结果:在两个家系所有患者的KRT9基因1号外显子均检测到c．487C＞T 错义突变(p．163Ｒ＞W),家族未患病成员以及200名正常对照中未发现此突变。家系1中先证者的女儿和祖父除了掌跖角化过度外还出现了先天性指节垫和先天性指曲屈畸形,而家系2中所有患者并未出现该症状。结论: KRT9基因的c．487C＞T 错义突变是导致这两个表皮松解性掌跖角化病家系的遗传学病因,同一突变在不同家系或同一个家系的不同个体之间的临床表型存在差异。     

表皮松解性掌跖角化病二家系基因突变检测

目的：检测表皮松解性掌跖角化病二家系患者致病基因。方法：收集二家系资料,提取二家系成员及100名（无亲缘关系）正常对照血样DNA,采取聚合酶链反应技术对KRT1、KRT9和KRT16基因进行扩增,并对其产物进行测序。结果：家系1先证者中检测到 KRT1基因突变c.598T>C（p.F200L）。家系2三例患者中检测到KRT9基因含杂合突变c.488G>A（p.R163Q）。而家系正常成员及家系外无亲缘关系的100名正常对照中均不存在以上突变。结论：本研究表皮松解性掌跖角化病二家系发病与KRT1、KRT9基因突变有关,且KRT1基因突变p.F200L为国内首次报道。     

表皮松解性掌跖角皮症一家系KRT9基因新突变

目的:检测表皮松解性掌跖角皮症一家系患者角蛋白9(KRT9)基因突变。方法:收集家系成员的临床资料和血样,提取家系中4例患者和3名正常人及50名与本家系无关的正常对照外周血DNA,采用PCR技术扩增KRT9基因所有编码区并进行测序,分别检测家系中的突变情况。结果:该家系中所有患者均存在KRT9基因错义突变(c.484TC),导致第162位密码子由TCT(丝氨酸)转变为CCT(脯氨酸)(p.S162P),家系中3名正常个体和50名健康对照均未发现上述突变。结论:KRT9基因c.484TC错义突变是导致该家系发生表皮松解性掌跖角皮症的遗传基础。     

表皮松解性掌跖角化病一家系KRT9基因突变检测及生物信息学分析

目的:检测表皮松解性掌跖角化病1家系KRT9基因突变情况并进行生物信息学分析。方法:提取家系患者、正常人及100名健康志愿者外周血DNA,采用聚合酶链式反应(PCR)扩增KRT9基因全部外显子并测序。与数据库比对测序结果,运用生物信息学软件进行突变型蛋白质结构及功能预测分析。结果:患者KRT9基因1号外显子内检测到一处c.487CT错义突变(p.163RW),家族未患病成员以及100名正常对照中未发现突变。生物信息学分析提示该突变会导致蛋白质二级结构和理化性质改变,功能分析提示该突变会改变蛋白质生物功能。结论:本家系检测到1个KRT9基因的热点突变,该突变对于疾病发生发展可能具有较大作用。     

表皮松解性掌跖角化病一家系KRT9基因突变检测

目的：检测一表皮松解性掌跖角化病(epidermolytic palmoplantar keratoderma,EPPK)家系中患者及其家族成员的KRT9基因突变。方法：收集该EPPK家系先证者及其家族成员临床资料,提取他们及100例无亲缘关系的健康对照外周血DNA,PCR扩增KRT9基因编码区的全部外显子及其侧翼序列,对产物直接测序,同时进行突变点的功能预测。结果：该家系所有患者的KRT9基因1号外显子第482位碱基均发生错义突变c.482A>G(p.Asn161Ser)。家系中未患病者及100名正常对照中均未发现此突变。SIFT和Polyphen-2软件预测c.482A>G(p.Asn161Ser)突变为有害变异位点。结论：KRT9基因的突变c.482A>G(p.Asn161Ser)可能是导致该家系发生表皮松解性掌跖角化病的原因。     

伴指间关节畸形的掌跖角化病家系基因突变检测

目的：检测一掌跖角化病家系致病基因的突变。方法：收集一具有4例患者的掌跖角化病家系和50位正常人的血液样本，抽提基因组DNA，PCR扩增致病基因（角蛋白9基因，KRT9）的外显子区，测序分析PCR产物。结果：该家系中4例患者的KRT9基因第1外显子第160位密码子发生AAT→AGT的突变，导致第160位的天门冬氨酸被丝氨酸取代（N160S），正常人中未发现此突变。结论：KRT9基因的AAT→AGT突变（N160S）是导致该家系发生弥漫性掌跖角化病的原因。     

KRT9基因突变所致表皮松解性掌跖角化病1例

报告KRT9基因突变所致表皮松解性掌跖角化病1例.患者男,中国籍,32岁,手足角化性斑块30余年.皮肤科检查:双侧掌跖面可见对称性弥漫性角化斑块,皮肤粗糙增厚,呈灰黄色.皮损组织病理:表皮明显角化过度,颗粒层棘层增厚,皮突延长,颗粒细胞变性,考虑掌跖角化病.基因全外显子组测序结果:KRT9基因外显子检测出c.487C＞...     

以严重掌跖角化过度为主要表现的表皮松解性角化过度症一家系报告及基因突变分析

目的:报告一个以严重掌跖角化过度为主要表现的表皮松解性角化过度症(epidermolytic hyperkeratosis,EHK)家系,并检测其基因突变情况.方法:收集1个EHK家系的临床资料,取先证者皮损行组织病理检查.提取先证者及其亲属外周血DNA,应用PCR扩增角蛋白1(KRTl)、角蛋白10(KRT10)和角蛋白9(KRT9)基因编码区的全部外显子及其侧翼序列并行双向DNA测序,以100名健康志愿者外周血DNA作正常对照.结果:先证者皮损组织病理符合表皮松解性角化过度,所有患者的KRT1基因第1436位碱基发生T→C错义突变,导致其第479位氨基酸从异亮氨酸(Ⅰ)变为苏氨酸(T) (p.I479T).家系中未受累者和100名正常对照者未检测到该突变.在该家系所有成员中未检测到KRT10和KRT9基因突变.结论:KRT1基因的错义突变(p.I479T)可能是导致该家系患者临床表型的病因.     

表皮松解性掌跖角化症家系KRT9基因突变与临床表型分析

目的明确1个表皮松解性掌跖角化症(EPPK)家系的致病基因突变,为开展遗传咨询及产前诊断提供依据。方法收集家系内所有患者的临床表型资料,并采集血样提取基因组DNA,采用包含表皮松解性掌跖角化症相关基因的二代测序Panel结合Sanger测序验证的方法检测该家系的基因突变。结果该家系所有患者均在KRT9基因检测到c.1373TC(p.Leu458Pro)的杂合突变,该突变位于角蛋白9(K9)高度保守的螺旋2B区,该家系患者均未出现已有报道中检测到该突变患者存在的指节垫和先天性指屈曲症状。结论 KRT9基因c.1373TC(Leu458Pro)的杂合突变为本研究中EPPK的遗传学病因,同一突变在不同家系或不同个体之间的临床表型存在差异。     

哈萨克族毛囊角化病一家系ATP2A2基因突变研究

目的 探讨哈萨克族毛囊角化病一家系患者ATP2A2基因突变.方法 收集哈萨克族毛囊角化病49人家系的临床资料,采集44名家系成员和100例无亲缘关系健康人外周血,提取基因组DNA.采用PCR和DNA测序对该家系进行ATP2A2基因突变检测.结果 该家系毛囊角化病遗传方式属于常染色体显性遗传.家系中11例患者在ATP2A2基因12号外显子的剪切位点发生杂合突变(1288-1G→A),即第1288-1位碱基由G突变为A,而家系中33例正常成员及100例健康对照均未发现该突变.结论 该家系毛囊角化病发病可能是由ATP2A2基因12号外显子的剪切位点发生杂合突变(1288-1G→A)所致.     

一个表皮松解性掌跖角化病家系的KRT1基因突变分析

目的 探讨一个中国汉族人表皮松解性掌跖角化病(EPPK)家系的角蛋白基因KRT1、KRT9、KRT10突变情况.方法 收集1个EPPK家系的临床资料,提取外周血DNA,通过PCR扩增角蛋白KRT1、KRT9、KRT10基因编码区的全部外显子及其侧翼序列并测序,以表型正常家系成员及50例健康人为正常对照.结果 发现家系内6例患者均存在KRT1基因错义突变c.1436T>C,导致第479位的异亮氨酸被苏氨酸取代(I479T),在家系中6例正常人及50例对照者未发现上述突变.结论 错义突变KRTI的c.1436T>C可能为导致该家系临床表型的主要原因.本例为国内首次发现的KRT1突变引起的EPPK家系.

Abstract：

Objective To analyze the mutations in keratin 1 (KRT1), KRT9 and KRT10 genes in a Chinese family with epidermolytic palmoplantar keratoderma (EPPK). Methods Clinical data were collected from a family with EPPK. Genomic DNA was extracted from the peripheral blood of 12 family members, including 6 patients and 6 unaffected members, as well as from 50 unrelated normal human controls. PCR was performed to amplify all the exons and flanking sequences of KRT1, KRT9 and KRT10 genes followed by DNA sequencing.Results A missense mutation C.1436T > C was found in the highly conserved helix termination motif of KRT1 gene of all the patients, resulting in a substitution of isoleucine by threonine at position 479 of the KRT1 protein. No mutation was found in the unaffected members or unrelated controls. Conclusions The missense mutation C.1436T > C in K.RT1 gene is likely to be the main cause of the phenotype of EPPK in this family.This is the first report of a pedigree with KRT1 gene mutation-induced EPPK in China.     

Analysis of the KRT9 Gene in a Mexican Family with Epidermolytic Palmoplantar Keratoderma

Epidermolytic palmoplantar keratoderma (EPPK), an autosomal‐dominant genodermatosis, is the most frequently occurring hereditary palmoplantar keratoderma. EPPK is characterized by hyperkeratosis of the palms and soles. Approximately 90% of patients present with mutations in the KRT9 gene, which encodes for keratin 9. Many of these mutations are located within the highly conserved coil 1A region of the alpha‐helical rod domain of keratin 9, an important domain for keratin heterodimerization. The objective was to assess the clinical and molecular characteristics of a Mexican family with EPPK. The clinical characteristics of members of this family were analyzed. The KRT9 gene of affected members was polymerase chain reaction amplified from genomic DNA and sequenced. All affected members of the family had hyperkeratosis of the palms and soles with knuckle pads. The R163W mutation in the KRT9 gene was present in all affected individuals who were tested. Although R163W is the most frequent KRT9 mutation in patients with EPPK, only two families have been reported with knuckle pads associated with this mutation. Our findings indicate that knuckle pads can be associated with EPPK and the R163W mutation in a family with a genetic background different from that described here.     

Identification of the keratin 9 (KRT9) N161S mutation in a Chinese kindred with epidermolytic palmoplantar keratoderma

We present a family from Northeast China affected by epidermolytic palmoplantar keratoderma (EPPK) in which we confirmed the presence of the N161S mutation as the result of a 548A>G transition in exon1 of the keratin 9 gene. Genomic DNA from peripheral blood of all available members in this family was used for amplification of exon 1 of KRT9 by polymerase chain reaction. The mutation was detected by direct sequence analysis and identified by restriction endonuclease DdeI digestion. The finding of the same mutation in all available patients, together with the previous reports of the disease, strongly suggested that position 161 of the KRT9 gene also represents a mutation "hotspot" for EPPK. Our result is an important contribution to the investigation of the genotype/phenotype correlation and affords molecular genetic knowledge for future clinical diagnosis and gene therapy of EPPK.     

A novel mutation of keratin 9 in a large Chinese family with epidermolytic palmoplantar keratoderma

BACKGROUND: Epidermolytic palmoplantar keratoderma (EPPK) is an autosomal dominant inherited skin disorder characterized by diffuse yellow thickening of the skin of the palms and soles, sharply bordered with erythematous margins. Histologically and ultrastructurally, EPPK presents cytolysis of keratinocytes and abnormal aggregation of tonofilaments in the suprabasal layers of the epidermis. To date, 15 different mutations of the keratin 9 gene (KRT9) have been demonstrated to cause most cases of EPPK. OBJECTIVES: To identify the KRT9 mutation in a large Chinese family with EPPK. METHODS: Denaturing high-performance liquid chromatography (DHPLC), DNA sequencing and allele-specific polymerase chain reaction (AS-PCR) were used to screen exon 1 of the KRT9 gene for sequence variations. RESULTS: The DHPLC elution profiles of the DNA fragments amplified from the affected samples differed from those obtained from unaffected individuals, indicating that a sequence variation existed within the analysed fragment of KRT9. DNA sequencing revealed a novel insertion-deletion mutation in the exon 1 of KRT9, 497delAinsGGCT, resulting in the change of tyrosine(166) to tryptophan and leucine (Y166delinsWL). AS-PCR confirmed the mutation was not a common polymorphism. CONCLUSIONS: The results suggest the molecular basis of EPPK in this Chinese family and provide further evidence that mutations in the helix initiation motif of keratin 9 underlie Chinese EPPK.     

Ⅱ型先天性厚甲症一家系KRT基因突变检测

目的:检测先天性厚甲症一家系中KRT6b和KRT17基因突变位点。方法:提取先证者、其父母(母亲为患者,父亲正常人)及100名正常对照者外周静脉血DNA,PCR技术扩增KRT6b和KRT17基因编码序列,Sanger测序法对PCR扩增产物进行测序。结果:先症者及其母亲在KRT17基因1号外显子上存在错义突变(c.275AG),KRT6b基因不存在任何突变。先证者父亲及100名正常对照者中未检测到任何突变。结论:此家系患者是由于KRT17基因突变(c.275AG,p.Asn92Ser)所致。     

Dowling-Degos病1家系KRT5基因新突变分析

【摘要】 目的 分析Dowling-Degos病1家系KRT5基因突变情况。方法 收集先证者临床资料,调查先证者家族3代共12人信息,采集先证者和8例家系成员以及家系以外50例无亲缘关系的健康人外周血,提取基因组DNA行全外显子测序后与人类基因组KRT5、POFUT1及POGLUT1序列进行比对。结果 本家系有3例患者,分别为先证者及其父亲和祖母（去世）。先证者及其父亲临床表现为皱褶部网状色素沉着,以胸腹皱褶部位为重,且KRT5基因第一外显子均存在c.165T>A杂合无义突变,其他家系成员及健康对照均未发现此突变,所有受试者POFUT1及POGLUT1基因检测未见异常。结论 本研究新发现1处KRT5基因c.165T>A突变,导致先证者及其父Dowling-Degos病。