The RNA-binding protein SUP-12 controls muscle-specific splicing of the ADF/cofilin pre-mRNA in C. elegans.

The RNA-binding protein SUP-12 controls muscle-specific splicing of the ADF/cofilin pre-mRNA in C. elegans.
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DOI:
10.1083/jcb.200407085
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发表时间:
2004-11-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Ono S
Ono S
中科院分区:
其他
文献类型:
--
作者:
Anyanful A;Ono K;Johnsen RC;Ly H;Jensen V;Baillie DL;Ono S

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组织特异性前体mRNA剪接对于增加功能不同的基因产物的多样性是必不可少的。在秀丽隐杆线虫中,肌动蛋白解聚因子(ADF)/cofilin的非肌肉和肌肉异构体nc-60 A和nc-60 B通过选择性剪接unc-60表达,并调节不同的肌动蛋白依赖性发育过程。我们报告说,一个新的RNA识别基序(RRM)蛋白家族的成员,包括SEB-4,调节肌肉特异性剪接unc-60。在sup-12突变体中,在肌肉中,β-60 B的表达降低,而β-60 A的表达上调。在unc-60 B突变体中,sup-12突变通过允许在肌肉中表达可替代UNC 60 B的UNC 60 A,从而揭示其功能冗余,从而强烈抑制肌肉缺陷。β-12在肌肉中表达,并以斑点图案定位于细胞核。RRM结构域与unc-60前体mRNA的多个位点结合,包括第一内含子中3′剪接位点附近的UG重复序列。我们的研究结果表明,ADF-12是一种新的组织特异性剪接因子,调节ADF/cofilin亚型之间的功能冗余。
Tissue-specific alternative pre-mRNA splicing is essential for increasing diversity of functionally different gene products. In Caenorhabditis elegans, UNC-60A and UNC-60B, nonmuscle and muscle isoforms of actin depolymerizing factor (ADF)/cofilin, are expressed by alternative splicing of unc-60 and regulate distinct actin-dependent developmental processes. We report that SUP-12, a member of a new family of RNA recognition motif (RRM) proteins, including SEB-4, regulates muscle-specific splicing of unc-60. In sup-12 mutants, expression of UNC-60B is decreased, whereas UNC-60A is up-regulated in muscle. sup-12 mutations strongly suppress muscle defects in unc-60B mutants by allowing expression of UNC-60A in muscle that can substitute for UNC-60B, thus unmasking their functional redundancy. SUP-12 is expressed in muscle and localized to the nuclei in a speckled pattern. The RRM domain of SUP-12 binds to several sites of the unc-60 pre-mRNA including the UG repeats near the 3′-splice site in the first intron. Our results suggest that SUP-12 is a novel tissue-specific splicing factor and regulates functional redundancy among ADF/cofilin isoforms.
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