凝聚素保持复制时间,以抑制癌症基因上的DNA损伤
Jinchun Wu1, Yang Liu1, Zhengrong Zhangding1
1The MOE Key Laboratory of Cell Proliferation and Differentiation, School of Life Sciences, Center for Life Sciences, Genome Editing Research Center, Peking University, Beijing, China.
Nature genetics
|July 27, 2023
概括
凝聚素损失,特别是RAD21枯竭,通过通过过度DNA复制启动诱导复制应激,导致全基因组DNA断裂和转位,可能促进癌症.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 癌症生物学 癌症生物学
背景情况:
- 凝聚素功能丧失突变在瘤中很常见,但它们在瘤发生中的作用尚未完全理解.
- RAD21是凝聚素的核心子单元,对其功能至关重要.
- 了解凝聚素在DNA损伤和癌症中的作用至关重要.
研究的目的:
- 调查RAD21耗尽导致瘤发生的机制.
- 确定凝聚素功能障碍,DNA断裂和染色体转位之间的关系.
- 阐明DNA复制应激在与凝聚素相关的癌症发展中的作用.
主要方法:
- 在细胞中减少RAD21以研究其影响.
- 对DNA断裂和转位热点的全基因组分析.
- 评估DNA复制速度,分叉停滞和复制时间.
- 对奥卡扎基碎片分布和休眠起源启动的分析.
主要成果:
- RAD21的耗尽导致了全基因组的大规模DNA断裂,并确定了147个转位热点基因.
- DNA损伤独立于转录变化或循环破坏.
- 染色体转位与不对称的奥卡扎基碎片相关,表明复制应激 (速度减慢,分叉停滞).
- 由于过度的休眠起源启动,RAD21的耗尽导致了~30%的基因组更早的复制时间.
- 大多数转移热点都位于这些时间变化的地区.
结论:
- 凝聚素功能障碍,以RAD21枯竭为例,通过异常的DNA复制启动诱导复制应激.
- 这种复制压力导致严重的DNA损伤和染色体转位,可能导致瘤发生.
- 针对与凝聚素相关的复制应激路径可能提供新的癌症治疗策略.
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