UHRF1 基因酶活性支持维持低密度 CpG 甲基化
Rochelle L Tiedemann1, Joel Hrit1, Qian Du2
1Department of Epigenetics, Van Andel Institute, 333 Bostwick Ave NE, Grand Rapids, MI 49503, USA.
Nucleic acids research
|November 28, 2024
概括
基因甲基化遗传依赖于通过UHRF1和DNMT1.1.通过ubiquitin信号传递. 破坏这种途径会影响低密度CpG,导致癌症中出现的部分甲基化域 (PMD).
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
背景情况:
- UHRF1 (具有PHD和RING指域1的泛素类) 是DNA甲基化遗传的关键E3泛素连酶.
- 据认为,UHRF1通过基因素H3尾巴的无化,将DNMT1 (DNA甲基转移酶1) 招募到染色质中,通过UIMs (无胺相互作用基因) 创建结合点.
研究的目的:
- 调查UHRF1的泛素酶活性和DNMT1的泛素读取活性在DNA甲基化维护中的作用.
- 确定UHRF1-DNMT1无素信号轴中破坏如何影响DNA甲基化模式,特别是在癌症的背景下.
主要方法:
- 综合性表观遗传学分析
- 生物化学测定 生物化学测定
- 功能性研究涉及破坏UHRF1和DNMT1的泛胺相互作用基因 (UIM1和UIM2) 的功能性研究.
主要成果:
- 在低密度CpG的DNA甲基化维护对受损的UHRF1联酶活性和DNMT1UIM1功能敏感,导致部分甲基化域 (PMD).
- 干扰DNMT1和UIM2的功能取消了DNA甲基化维护独立于CpG密度.
- 在DNMT1耗尽后,UHRF1泛素酶活性在DNA再甲基化中起着"书签"的作用.
结论:
- DNMT1依赖的DNA甲基化遗传是由无素信号调节的,部分依赖于UHRF1.
- 一个被破坏的UHRF1-DNMT1泛素信号轴与在人类癌症中观察到的PMD的形成有关.
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