A Novel Nonsense Mutation at E106 of the 2B Rod Domain of Keratin 14 Causes Dominant Epidermolysis Bullosa Simplex

A Novel Nonsense Mutation at E106 of the 2B Rod Domain of Keratin 14 Causes Dominant Epidermolysis Bullosa Simplex
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角蛋白 14 2B 杆结构域 E106 处的新型无义突变导致显性单纯性大疱性表皮松解症

DOI:
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发表时间:
2002
期刊:
Journal of dermatology (Print)
影响因子:
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通讯作者:
Y. Kitajima
Y. Kitajima
中科院分区:
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文献类型:
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作者:
L. Gu;Y. Ichiki;Miki Sato;Y. Kitajima

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单纯性大疱性表皮松解症(EBS)分为三种主要类型,在大多数情况下,是由编码角蛋白(K)5和K14的基因错义突变引起的。在这项研究中,我们从临床、超微结构、免疫组织化学和分子生物学的角度研究了一例以Köbner型为主的EBS患者。通过基因组DNA序列分析,发现了一个新的K14无义突变。KRT14的G1231T杂合突变被发现与该患者的疾病相关。该突变在K14分子中产生了一个提前终止密码子(氨基酸密码子411,2B螺旋的106个残基)。这个残基位于一个高度保守的区域,最近被发现是K5和K14中分子稳定性和中间丝组装所必需的。E411X(E106X)杂合性消融丢失了2B的最后16个氨基酸残基和K14的整个尾部结构域,导致了疾病,但没有导致角蛋白细丝聚集。这是在显性EBS中发现的第一个K14过早终止密码子突变。
Epidermolysis bullosa simplex (EBS) is classified into three main types and is caused, in most cases, by missense mutations in the genes encoding keratin (K) 5 and K14. In this study, we clinically, ultrastructurally, immunohistochemically, and molecularly studied a patient with a dominant EBS, Köbner type. Using sequence analysis of genomic DNA, a novel K14 nonsense mutation was identified. A heterozygous mutation G1231T of KRT14 was found to be associated with the disease in the patient. The mutation created a premature stop codon (amino acid codon 411, residue 106 of the 2B helix) in the K14 molecule. This residue lies in a highly conserved region and was recently found to be absolutely required for molecular stability and intermediate filament assembly in K5 and K14. The E411X (E106X) heterozygous ablation, missing the last 16 amino acid residues of the 2B and the entire tail domain of K14, led to disease but did not result in clumping of keratin filaments. It is the first premature stop codon mutation of K14 found in dominant EBS.
一例严重的Dowling-Meara单纯性大疱性表皮松解症的遗传分析。
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