Molecular genetic analysis of 16 XP‐C patients from Germany: environmental factors predominately contribute to phenotype variations

Molecular genetic analysis of 16 XP‐C patients from Germany: environmental factors predominately contribute to phenotype variations
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德国16例XPâC患者的分子遗传学分析:环境因素是导致表型变异的主要原因

DOI:
10.1111/exd.12052
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发表时间:
2012
影响因子:
3.6
通讯作者:
S. Emmert
S. Emmert
中科院分区:
医学2区
文献类型:
--
作者:
A. Schäfer;L. Hofmann;A. Gratchev;P. Laspe;S. Schubert;A. Schürer;A. Ohlenbusch;M. Tzvetkov;C. Hallermann;J. Reichrath;M. P. Schön;S. Emmert

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属于色素性干皮病(XP)互补组C的患者占所有XP患者的三分之一。只有四份主要报告汇编了来自南欧(12例)、北美(16例)和非洲(14例和56例)以及他们的遗传背景(46XPCmutations)的较大的XP‐C患者组。我们确定了来自德国的16例XP‐C患者。有趣的是,只有5名患者表现出严重的日光敏感性。XP诊断的平均年龄为9.4岁,首次皮肤癌的中位年龄为7岁。除2例患者外,其余患者均无神经系统症状。所有16例患者的原代成纤维细胞均显示紫外线照射后细胞存活率降低(平均:50%,而正常细胞为93%),紫外线照射后荧光素酶报告基因的再激活率降低(平均:6.4%,而正常细胞为30.7%)。与正常细胞相比,XPCmRNA的表达量也大大降低(平均值:14.3%,范围8.3-25.7%),但XP47MA的表达量为274.1%。所有患者均携带纯合xpct突变。以前描述过四种突变:c.1747 - 1748 deltg(发现于4/16),c.567C>T (4/16), C .1839C>T(1/16)和外显子9的复杂插入/删除突变(1/16)。新的移码突变c.446_447delAG (2/16), c.1525insA(1/16)和c.2271delC(1/16)导致XPC蛋白截断,新的无义突变c.843C>T(1/16)也是如此。XP47MA携带一个有趣的突变(c.2538_2540delATC; p.Ile812del),导致框内单个氨基酸缺失。该突变导致典型的XP表型,即无功能的XPC蛋白,但xpcmrna表达升高。我们的研究表明,由于无意义介导的信息衰减,外部因素可能有助于XP - C症状的严重程度。
Patients belonging to xeroderma pigmentosum (XP) complementation group C comprise one‐third of all XP patients. Only four major reports compiled larger groups of XP‐C patients from southern Europe (12 pts), North America (16 pts) and Africa (14 and 56 pts) as well as their genetic background (46XPCmutations). We identified 16 XP‐C patients from Germany. Interestingly, only five patients exhibited severe sun sensitivity. The mean age of XP diagnosis was 9.4 years, and the median age of the first skin cancer was 7 years. Neurological symptoms were absent in all but two patients. Primary fibroblasts from all 16 patients showed reduced post‐UV cell survival (mean: 50% vs 93% in normal cells) and reduced reactivation of an UV‐treated luciferase reporter gene (mean: 6.4% vs 30.7% in normal cells).XPCmRNA expression was also greatly reduced compared with normal cells (mean: 14.3%; range 8.3–25.7%) except in XP47MA (274.1%). All patients carried homozygousXPCmutations. Four mutations have been described previously: c.1747_1748delTG (found in 4/16), c.567 C>T (4/16), c.1839 C>T (1/16) and a complex insertion/deletion mutation in exon 9 (1/16). The novel frameshift mutations c.446_447delAG (2/16), c.1525insA (1/16) and c.2271delC (1/16) lead to truncated XPC proteins as does the novel nonsense mutation c.843C>T (1/16). XP47MA carries an interesting mutation (c.2538_2540delATC; p.Ile812del) resulting in an in‐frame single amino acid deletion. This mutation results in a classical XP phenotype, a non‐functional XPC protein, but elevatedXPCmRNA expression. Our study indicates that extrinsic factors may contribute to XP‐C symptom severity due to nonsense‐mediated message decay.
XPC DNA 修复基因中的一种新型复杂插入/缺失突变导致伊拉克一个家庭患皮肤癌。
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来自着色性干皮病互补组 C 的紫外线照射细胞中特定染色质结构域的选择性修复。
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发表时间: 1990
期刊: Mutation research
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发表时间: 2011-03
影响因子: 4
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发表时间: 2005-01-01
影响因子: 3.5
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DOI: 10.1046/j.1523-1747.2002.01782.x
发表时间: 2002-06-01
影响因子: 6.5
作者:
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