酵母EndoG通过降解细胞质DNA来防止基因组不稳定
bioRxiv : the preprint server for biology
|January 3, 2024
概括
酵母Nuc1核酶通过降解细胞质DNA,如线粒体DNA (mtDNA) 和逆转移体cDNA,防止基因组的不稳定. 这种酶限制了核中有害的DNA插入,从而保持了基因组的完整性.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 细胞生物学 细胞生物学
背景情况:
- 细胞质DNA,包括线粒体DNA (mtDNA) 和逆转移体cDNA,可以触发甲基动物的无菌炎症和疾病.
- 细胞质核酶降解这些DNA物种以减轻炎症,但它们在防止核基因组不稳定性方面的作用尚不清楚.
研究的目的:
- 为了确定规范细胞质DNA物种向核转移的特定核酶.
- 研究这种核酶在维持核基因组稳定性中的作用.
主要方法:
- 在酵母中使用基于片测序的方法来分析数以百万计的双链断裂 (DSB) 修复产品.
- 在各种细胞条件下量化核mtDNA (NUMT) 和逆转移子cDNA插入.
主要成果:
- 核mtDNA (NUMT) 和逆转移子cDNA插入在非分裂静止阶段酵母细胞中显著增加.
- 发现酵母EndoG (Nuc1) 核酶限制了逆转移子cDNA和非常长mtDNA (>10 kb) 的插入.
- Nuc1促进短NUMT (∼45-200 bp) 的形成,并调节细胞质DNA在衰老和半分裂过程中的转移.
结论:
- 通过降解逆转移子cDNA和长mtDNA,Nuc1保持了基因组的稳定性,防止它们有害的核融合.
- 短NUMT可能来自不完全降解的mtDNA,这表明Nuc1在DNA管理中的双重作用.
- 消除细胞质DNA的核酶在维持整体基因组稳定性方面发挥着至关重要的作用.
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