在RAG2 C末端抑制基因组不稳定性和淋巴发育
Ludovic Deriano1, Julie Chaumeil, Marc Coussens
1Department of Pathology, New York University School of Medicine, New York, NY 10016, USA.
Nature
|March 4, 2011
概括
这就是RAG2蛋白质.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 免疫学 免疫学 免疫学
背景情况:
- 来自V(D) J重组的DNA双链断裂 (DSB) 的错误修复与淋巴细胞癌症有关.
- 在DNA修复途径 (ATM,NHEJ,p53) 的缺陷增加了RAG引发的基因组不稳定性和淋巴发育的易感性.
研究的目的:
- 研究RAG2碳氧 (C) 末端在维持基因组稳定性中的作用.
- 阐明RAG2在V(D) J重组过程中影响基因组完整性的机制.
主要方法:
- 从转基因小鼠 (Rag2 (((c/c),p53 (((-/-),Atm (((-/-)) 获得的胸细胞和淋巴瘤基因组的分析.
- 评估T细胞受体 (Tcr) 位置完整性和染色体异常.
- 在核心RAG2和ATM缺陷的背景下,研究RAG分裂后复合体稳定性.
主要成果:
- RAG2 C端对基因组稳定性至关重要,尽管它对于V(D) J重组是不可或缺的.
- 拉格2 (c/c) 胸细胞表现出Tcrα/δ位置的不稳定性.
- 拉格2 ((c/c) p53 ((-/-) 小鼠迅速发展出具有复杂基因组变异的胸腺淋巴瘤,类似于Atm ((-/-) 淋巴瘤.
- 核心RAG2破坏RAG分裂后复合物的稳定,反映了ATM缺陷效应.
结论:
- 在保护基因组方面,RAG2具有以前未知的作用.
- RAG2 C端作为基因组守护者,防止基因组不稳定.
- 分享的"终释放/终持久"机制有助于Rag2 (c/c) p53 (--/-) 和Atm (--/-) 小鼠的淋巴发生.
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