Expression of progerin does not result in an increased mutation rate.

Expression of progerin does not result in an increased mutation rate.
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DOI:
10.1007/s10577-017-9556-x
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发表时间:
2017-10
期刊:
Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology
影响因子:
--
通讯作者:
Bickmore WA
Bickmore WA
中科院分区:
其他
文献类型:
--
作者:
Deniaud E;Lemaître C;Boyle S;Bickmore WA

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在早衰疾病哈钦森-吉尔福德早衰综合征(HGPS)中,层粘连蛋白A基因的潜在遗传缺陷导致早衰蛋白积聚在核层,这是一种不能正确处理的突变形式的层粘连蛋白A。据报道,这导致DNA损伤反应和DNA修复的缺陷,导致假设,在正常衰老和其他由DNA修复和DNA损伤反应途径基因突变引起的类早衰综合征中,DNA损伤的增加可能是HGPS患者过早衰老表型的原因。然而,这一假设是基于对DNA损伤反应的标记物的研究,而不是对DNA损伤本身或未修复的DNA损伤突变的后果的测量。在这里,使用突变报告细胞系,我们直接比较了表达野生型lamin a或progerin的细胞的固有突变率和诱导突变率。我们没有发现在表达早衰蛋白的细胞中突变率升高的证据。我们得出结论,HGPS细胞的细胞缺陷并不在于DNA损伤本身的修复。
In the premature ageing disease Hutchinson-Gilford progeria syndrome (HGPS), the underlying genetic defect in the lamin A gene leads to accumulation at the nuclear lamina of progerin—a mutant form of lamin A that cannot be correctly processed. This has been reported to result in defects in the DNA damage response and in DNA repair, leading to the hypothesis that, as in normal ageing and in other progeroid syndromes caused by mutation of genes of the DNA repair and DNA damage response pathways, increased DNA damage may be responsible for the premature ageing phenotypes in HGPS patients. However, this hypothesis is based upon the study of markers of the DNA damage response, rather than measurement of DNA damage per se or the consequences of unrepaired DNA damage—mutation. Here, using a mutation reporter cell line, we directly compared the inherent and induced mutation rates in cells expressing wild-type lamin A or progerin. We find no evidence for an elevated mutation rate in progerin-expressing cells. We conclude that the cellular defect in HGPS cells does not lie in the repair of DNA damage per se.
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