A Distinct Genotype of XP Complementation Group A: Surprisingly Mild Phenotype Highly Prevalent in Northern India/Pakistan/Afghanistan.

A Distinct Genotype of XP Complementation Group A: Surprisingly Mild Phenotype Highly Prevalent in Northern India/Pakistan/Afghanistan.
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XP 互补组 A 的独特基因型:令人惊讶的温和表型在印度北部/巴基斯坦/阿富汗非常普遍。

DOI:
10.1016/j.jid.2015.12.031
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发表时间:
2016
期刊:
The Journal of investigative dermatology
影响因子:
--
通讯作者:
Sethi M
Sethi M
中科院分区:
--
文献类型:
--
作者:
Sethi M

文献摘要

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着色性干皮病(XP)是一种罕见的遗传性DNA修复障碍。受影响的个体不能修复紫外线辐射(UVR)诱导的DNA损伤,导致皮肤癌风险增加(Bradford等人,2011),约50%的患者严重晒伤(Sethi等人,2013),以及大约30%的进行性神经变性(Kraemer等人,1987年,Totonchy等人,2013年)。XP可以由八个基因(XPA-XPG和POLH)中的任何一个缺陷引起。XPA-XPG参与DNA损伤的核苷酸切除修复(NER)(Cleaver等人,2009).着色性干皮病互补组A(XP-A)患者通常具有严重的表型,具有夸大的晒伤和进行性神经变性的早期发作,其通常在第二或第三个十年中导致死亡(Anttinen等人,2008年)。XPA蛋白是NER途径中损伤验证所必需的。在XPA基因中已经鉴定了超过20种不同的突变(States et al.,1998年,Takahashi等人,2010年)。许多报告的病例来自日本,因为创始人突变(c。390-1G> C)由1%的日本人口携带(Hirai等人,2006年,Satokata等人,1990年)。这种突变导致mRNA的异常剪接,随后产生截短的无功能XPA蛋白和典型的严重临床表型。
Xeroderma pigmentosum (XP) is a rare inherited disorder of DNA repair. Affected individuals cannot repair ultraviolet radiation (UVR)–induced DNA damage, resulting in an increased skin cancer risk (Bradford et al., 2011), severe sunburn in approximately 50% of patients (Sethi et al., 2013), and progressive neurodegeneration in approximately 30%(Kraemer et al., 1987, Totonchy et al., 2013). XP can result from defects in any of eight genes (XPA–XPG and POLH). XPA–XPG are involved in nucleotide excision repair (NER) of DNA damage (Cleaver et al., 2009).Xeroderma pigmentosum complementation group A (XP-A) patients usually have a severe phenotype, with exaggerated sunburn and early onset of progressive neurodegeneration, which results in death, usually in the second or third decade (Anttinen et al., 2008). XPA protein is required for damage verification in the NER pathway. More than 20 different mutations have been identified in the XPA gene (States et al., 1998, Takahashi et al., 2010). Many of the reported cases come from Japan because of a founder mutation (c. 390-1G> C) carried by 1% of the Japanese population (Hirai et al., 2006, Satokata et al., 1990). This mutation results in abnormal splicing of mRNA and subsequent production of truncated, nonfunctioning XPA protein and the typically severe clinical phenotype.