FANCM and FAAP24 maintain genome stability via cooperative as well as unique functions.

FANCM and FAAP24 maintain genome stability via cooperative as well as unique functions.
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DOI:
10.1016/j.molcel.2012.12.010
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发表时间:
2013-03-07
期刊:
影响因子:
16
通讯作者:
Li, Lei
Li, Lei
中科院分区:
生物学1区
文献类型:
--
作者:
Wang, Yucai;Leung, Justin W.;Jiang, Yingjun;Lowery, Megan G.;Do, Huong;Vasquez, Karen M.;Chen, Junjie;Wang, Weidong;Li, Lei

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DNA 重塑酶 FANCM 及其 DNA 结合伴侣 FAAP24 构成了参与范可尼贫血 (FA) DNA 损伤反应机制激活的复合物,但这两个基因都没有明显的患者突变体。在这项研究中,我们为 FANCM 和 FAAP24 创建了同基因模型,并研究了它们在 DNA 损伤反应中的整合功能。我们发现 FANCM 和 FAAP24 协调促进 FA 途径激活并抑制姐妹染色单体交换。重要的是,我们表明 FANCM 和 FAAP24 具有非重叠功能,例如 FAAP24 促进 ATR 介导的检查点激活,特别是对 DNA 交联剂的反应,而 FANCM 通过促进需要其易位酶活性的病变切口活动的招募来参与不重组的链间交联修复。我们的数据表明 FANCM 和 FAAP24 在维持基因组完整性方面发挥多种但不完全上位的作用。
The DNA remodeling enzyme FANCM and its DNA-binding partner, FAAP24, constitute a complex involved in the activation of Fanconi Anemia (FA) DNA damage response mechanism, but neither gene has distinct patient mutants. In this study, we created isogenic models for both FANCM and FAAP24 and investigated their integrated functions in DNA damage response. We found that FANCM and FAAP24 coordinately facilitate FA pathway activation and suppress sister chromatid exchange. Importantly, we show that FANCM and FAAP24 possess non-overlapping functions such that FAAP24 promotes ATR-mediated checkpoint activation particularly in response to DNA crosslinking agents, whereas FANCM participates in recombination-independent interstrand crosslink repair by facilitating recruitment of lesion incision activities which requires its translocase activity. Our data suggest that FANCM and FAAP24 play multiple while not fully epistatic roles in maintaining genomic integrity.
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