通过RNA结合蛋白IGF2BP1直接和间接调节胎儿全球蛋白转录
Steven Coyne1, Ting Wu1, Mir Hossain1
1Division of Hematology/Oncology, Boston Children's Hospital, Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Stem Cell Institute, Broad Institute, Department of Pediatrics, Harvard Medical School, Boston, MA, 02115, USA.
bioRxiv : the preprint server for biology
|September 18, 2025
概括
结合RNA的蛋白质IGF2BP1通过结合HBG1/2转录物直接促进胎儿血红蛋白 (HbF) 的转化. 这一发现揭示了一种新的血红蛋白切换机制,独立于BCL11A调节.
科学领域:
- 分子生物学分子生物学
- 发展生物学 发展生物学
- 基因规则 基因规则
背景情况:
- 血红蛋白切换,从胎儿血红蛋白 (HbF) 过渡到成人血红蛋白 (HbA),对于发育至关重要,但其分子控制尚未完全理解.
- 已知RNA结合蛋白 (RBPs) 和像N-6甲基氨酸 (m6A) 这样的表观遗传修饰是发育过程中基因表达的调节者.
- 一种m6A结合蛋白的IGF2BP1以前通过抑制BCL11A.间接参与调节胎儿全球蛋白基因 (HBG1/2).
研究的目的:
- 阐明IGF2BP1调节发育性血红蛋白表达的精确分子机制.
- 研究IGF2BP1与HBG1/2转录物的潜在直接相互作用.
- 确定IGF2BP1对HBG1/2的调节是否依赖于其与BCL11A的已知相互作用.
主要方法:
- 研究IGF2BP1与HIC2的相互作用及其作为BCL11A抑制剂的作用.
- 使用RNA结合试验来评估IGF2BP1与HBG1/2转录的直接结合.
- 使用功能性测试来评估IGF2BP1对HBG1/2翻译的影响,重点关注m6A修饰部位.
主要成果:
- IGF2BP1结合并激活HIC2,这是BCL11A的抑制剂.
- IGF2BP1直接与HBG1/2转录物结合,以BCL11A独立的方式促进它们的翻译.
- 在HBG2转录的停止附近,特定的m6A修饰的序列对于IGF2BP1介导的正调节至关重要.
结论:
- IGF2BP1通过与HBG1/2mRNA的相互作用直接增强胎儿血红蛋白翻译,揭示了一个新的调节途径.
- 这种IGF2BP1对全球蛋白转录物的直接作用机制为血红蛋白切换提供了新的见解.
- 这些发现表明异常RBPs和全球蛋白转录之间存在直接的物理联系,扩大了我们对发育过程中基因调节的理解.
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