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:
影响因子:
--
通讯作者:
Sethi M
中科院分区:
文献类型:
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作者:
Sethi M
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.