...
首页> 外文期刊>Molecular and Cellular Biology >Exon selection in alpha-tropomyosin mRNA is regulated by the antagonistic action of RBM4 and PTB.
【24h】

Exon selection in alpha-tropomyosin mRNA is regulated by the antagonistic action of RBM4 and PTB.

机译:α-原肌球蛋白 mRNA 中的外显子选择受 RBM4 和 PTB 的拮抗作用调节。

获取原文
获取原文并翻译 | 示例
           

摘要

RNA-binding motif protein 4 (RBM4) has been implicated in the regulation of precursor mRNA splicing. Using differential display analysis, we identified mRNAs that associate with RBM4-containing messenger RNPs in vivo. Among these mRNAs, alpha-tropomyosin (alpha-TM) is known to exhibit a muscle cell type-specific splicing pattern. The level of the skeletal muscle-specific alpha-TM mRNA isoform partially correlated with that of RBM4 in human tissues examined and could be modulated by ectopic overexpression or suppression of RBM4. These results indicated that RBM4 directly influences the expression of the skeletal muscle-specific alpha-TM isoform. Using minigenes, we demonstrated that RBM4 can activate the selection of skeletal muscle-specific exons, possibly via binding to intronic pyrimidine-rich elements. By contrast, the splicing regulator polypyrimidine tract binding protein (PTB) excluded these exons; moreover, RBM4 antagonized this PTB-mediated exon exclusion likely by competing with PTB for binding to a CU-rich element. This study suggests a possible mechanism underlying the regulated alternative splicing of alpha-TM by the antagonistic splicing regulators RBM4 and PTB.
机译:RNA 结合基序蛋白 4 (RBM4) 与前体 mRNA 剪接的调控有关。使用差异展示分析,我们在体内鉴定了与含有 RBM4 的信使 RNP 相关的 mRNA。在这些 mRNA 中,已知 α-原肌球蛋白 (alpha-TM) 表现出肌肉细胞类型特异性剪接模式。所检查的骨骼肌特异性 α-TM mRNA 亚型的水平与人体组织中 RBM4 的水平部分相关,并且可以通过异位过表达或抑制 RBM4 进行调节。这些结果表明,RBM4直接影响骨骼肌特异性α-TM亚型的表达。使用微型基因,我们证明RBM4可以通过与富含内含子嘧啶的元件结合来激活骨骼肌特异性外显子的选择。相比之下,剪接调节因子聚嘧啶束结合蛋白(PTB)排除了这些外显子;此外,RBM4 可能通过与 PTB 竞争与富含 CU 的元件结合来拮抗这种 PTB 介导的外显子排斥。本研究表明了拮抗剪接调节因子 RBM4 和 PTB 调节 α-TM 选择性剪接的可能机制。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号