氨酸甲基化依赖的METTL14-SMN相互作用调节RNAm6的恒常性
Yi Zhang1, Lei Shen1, Lili Ren2
1Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, Duarte, CA, USA.
EMBO reports
|October 6, 2025
概括
运动神经元 (SMN) 蛋白质的存活与METTL14相互作用,影响N6-甲基氨酸 (m6A) 水平. 这一发现将肌肉调节障碍与脊髓肌肉缩 (SMA) 和DNA修复缺陷联系起来.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- N6-甲基氨酸 (m6A) 稳态对于发育至关重要,其失调与癌症和神经系统疾病等疾病有关.
- 规则的精确机制尚未完全理解.
- 运动神经元 (SMN) 蛋白质的存活对于运动神经元功能至关重要.
研究的目的:
- 为了识别新型调节器的 m6 A 稳态.
- 为了研究SMN蛋白在m6A修改中的作用.
- 探索m6A失调和脊髓肌肉缩 (SMA) 之间的联系.
主要方法:
- 蛋白与蛋白相互作用研究,以确定SMN作为METTL14结合伙伴.
- 分析患者衍生纤维细胞中的m6A水平,这些纤维细胞具有与SMA相关的突变.
- 评估DNA修复基因表达和对DNA破坏性物质的敏感性.
- 产生和分析一种甲基化缺陷的Mettl14小鼠模型.
主要成果:
- 通过它的Tudor域,SMN蛋白直接依赖氨酸甲基化方式与METTL14结合.
- 在SMN Tudor域中与SMA相关的突变破坏了METTL14相互作用,并降低了全球m6A水平.
- SMN 缺乏和 SMA 突变会损害 DNA 修复基因 mRNA 上的 m6A 沉积,导致 SMA 纤维细胞中对 DNA 损伤过敏.
- 缺乏Mettl14甲基化的小鼠模型表现出部分胚胎致死性和血液形成缺陷,表明在早期发育中的作用.
结论:
- SMN是m6的新型调节者,与METTL14复合体相互作用.
- 通过SMN-METTL14相互作用调节的失调,有助于SMA病理和DNA修复缺陷.
- 甲基化METTL14在胚胎发育和血液形成中起着重要作用.
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