聚A结合蛋白核1抑制了替代裂变和多基化位点
Mathias Jenal1, Ran Elkon, Fabricio Loayza-Puch
1Division of Gene Regulation, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
Cell
|April 17, 2012
概括
聚A结合蛋白核1 (PABPN1) 抑制了替代裂变和多化 (APA),这是一个关键的基因调节过程. 丢失PABPN1导致3'未翻译区域缩短,并影响微RNA调节.
科学领域:
- 分子生物学分子生物学
- 基因法规 基因法规
- 处理RNA处理RNA处理
背景情况:
- 替代裂变和多化 (APA) 是转录后基因调节的关键机制.
- 控制APA事件的特定因素在很大程度上仍未确定.
- APA的失调与各种人类疾病有关.
研究的目的:
- 使用高通量RNAi屏幕识别APA的新型调节剂.
- 阐明PABPN1控制APA的分子机制.
- 调查PABPN1在眼肌肉发育不良 (OPMD) 病变发生过程中的作用.
主要方法:
- 为APA开发基于报告者的RNAi屏幕.
- 在人类细胞中进行全基因组APA分析.
- 使者RNA转录和稳定性分析.
- 在体外切割试验.
- 在细胞培养和小鼠模型中突变PABPN1的表达.
主要成果:
- 鉴定PABPN1作为APA的新型调节剂.
- PABPN1功能的丧失导致广泛的3'未翻译区域缩短,这是由于对近端切割部位的增强使用.
- 这种APA失调会损害微RNA介导的基因抑制.
- 在OPMD中发现的突变PABPN1 (trePABPN1) 导致近端裂解部位的使用和核聚合物形成.
结论:
- PABPN1充当替代裂变和多基解的关键抑制剂.
- 在OPMD中,PABPN1调节APA的功能受到损害,导致疾病病理.
- 了解PABPN1在APA中的作用,为OPMD和其他涉及APA失调的疾病的治疗干预开辟了新的途径.
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