The R280H X-ray cross-complementing 1 germline variant induces genomic instability and cellular transformation.

The R280H X-ray cross-complementing 1 germline variant induces genomic instability and cellular transformation.
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DOI:
10.1016/j.dnarep.2015.05.005
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发表时间:
2015-07
期刊:
影响因子:
3.8
通讯作者:
Sweasy, Joann B.
Sweasy, Joann B.
中科院分区:
医学3区
文献类型:
--
作者:
Sizova, Dania V.;Keh, Agnes;Taylor, Ben F.;Sweasy, Joann B.

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X 射线修复交叉互补蛋白 1 (XRCC1) 作为 BER 酶的支架蛋白,在碱基切除 DNA 修复 (BER) 中发挥着重要作用。 BER 是基本 DNA 修复途径之一,每天每个细胞可修复超过 20,000 个内源性损伤。 XRCC1 是 BER 中最重要的参与者之一,其正常运作被认为对于有效的 DNA 修复是不可或缺的。尽管越来越多的证据表明 XRCC1 在维持基因组稳定性方面发挥着重要作用,但其最主要的变体之一 R280H (rs25489) 与癌症患病率之间的关系仍然不明确。在当前的研究中,我们从功能上表征了 R280H 变异表达对永生非转化小鼠乳腺上皮 C127 和人乳腺上皮 MCF10A 细胞的影响。我们发现 R280H 的表达导致小鼠 C127 细胞中病灶形成增加,并诱导人 MCF10A 细胞中的细胞转化。表达 R280H 的细胞显示染色体畸变水平显着增加,并在 G1 细胞周期阶段积累双链断裂。我们的结果证实了 R280H 与基因组不稳定性之间可能存在的联系,并表明携带这种突变的个体患癌症的风险可能增加。
X-ray Repair Cross Complementing protein 1 (XRCC1) plays an important role in base excision DNA repair (BER) as a scaffolding protein for BER enzymes. BER is one of the basic DNA repair pathways repairing greater than 20,000 endogenous lesions per cell per day. Proper functioning of XRCC1, one of the most important players in BER, was suggested to be indispensable for effective DNA repair. Despite accumulating evidence of an important role that XRCC1 plays in maintaining genomic stability, the relationship between one of its most predominant variants, R280H (rs25489), and cancer prevalence remains ambiguous. In the current study we functionally characterized the effect of the R280H variant expression on immortal non-transformed mouse mammary epithelial C127 and human breast epithelial MCF10A cells. We found that expression of R280H results in increased focus formation in mouse C127 cells and induces cellular transformation in human MCF10A cells. Cells expressing R280H showed significantly increased levels of chromosomal aberrations and accumulate double strand breaks in the G1 cell cycle phase. Our results confirm a possible link between R280H and genomic instability and suggest that individuals carrying this mutation may be at increased risk of cancer development.
DOI: 10.1093/nar/gkq193
发表时间: 2010-08
影响因子: 14.9
作者:
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发表时间: 2004-04-01
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发表时间: 2011-09-30
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发表时间: 2013-08-27
影响因子: 11.1
作者:
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通讯作者: Sweasy, Joann B.
DOI: 10.1016/0027-5107(82)90276-7
发表时间: 1982-01-01
期刊: MUTATION RESEARCH
影响因子: --
作者:
THOMPSON, LH;BROOKMAN, KW;MINKLER, JL
通讯作者: MINKLER, JL