Angulin proteins ILDR1 and ILDR2 regulate alternative pre-mRNA splicing through binding to splicing factors TRA2A, TRA2B, or SRSF1.

Angulin proteins ILDR1 and ILDR2 regulate alternative pre-mRNA splicing through binding to splicing factors TRA2A, TRA2B, or SRSF1.
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Angulin 蛋白 ILDR1 和 ILDR2 通过与剪接因子 TRA2A、TRA2B 或 SRSF1 结合来调节选择性前 mRNA 剪接

DOI:
10.1038/s41598-017-07530-z
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发表时间:
2017-08-07
期刊:
影响因子:
4.6
通讯作者:
Xu Z
Xu Z
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Liu Y;Nie H;Liu C;Zhai X;Sang Q;Wang Y;Shi D;Wang L;Xu Z

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角蛋白是一类进化上保守的I型跨膜蛋白,含有胞外ig样结构域。在哺乳动物中,已经鉴定出三种角蛋白,即免疫球蛋白样结构域含受体1 (ILDR1)、免疫球蛋白样结构域含受体2 (ILDR2)和脂解刺激脂蛋白受体(LSR)。这三种蛋白都定位于紧密连接(TJs),对TJ的形成很重要。ildr1基因突变可导致非综合征性听力损失(NSHL)。在目前的工作中,我们发现ILDR1结合剪接因子TRA2A, TRA2B和SRSF1,并在剪接因子存在时转运到细胞核中。此外,ILDR1还影响tubulin delta 1(TUBD1)、IQ motif containing B1(IQCB1)和protocadherin 19(Pcdh19)的选择性剪接。进一步的研究表明,ILDR2,而不是LSR,也结合剪接因子并调节选择性剪接。当内源性ILDR1和ILDR2表达在培养细胞中被sirna敲低时,tubd1和diqcb1的选择性剪接受到影响。总之,我们在这里表明,角蛋白ILDR1和ILDR2通过结合剪接因子TRA2A、TRA2B或SRSF1参与了mrna前剪接的选择性剪接。
Angulin proteins are a group of evolutionally conserved type I transmembrane proteins that contain an extracellular Ig-like domain. In mammals, three angulin proteins have been identified, namely immunoglobulin-like domain containing receptor 1 (ILDR1), immunoglobulin-like domain containing receptor 2 (ILDR2), and lipolysis-stimulated lipoprotein receptor (LSR). All three proteins have been shown to localize at tight junctions (TJs) and are important for TJ formation. Mutations inILDR1gene have been shown to cause non-syndromic hearing loss (NSHL). In the present work, we show that ILDR1 binds to splicing factors TRA2A, TRA2B, and SRSF1, and translocates into the nuclei when the splicing factors are present. Moreover, ILDR1 affects alternative splicing ofTubulin delta 1(TUBD1),IQ motif containing B1(IQCB1), andProtocadherin 19(Pcdh19). Further investigation show that ILDR2, but not LSR, also binds to the splicing factors and regulates alternative splicing. When endogenous ILDR1 and ILDR2 expression is knockdown with siRNAs in cultured cells, alternative splicing ofTUBD1andIQCB1is affected. In conclusion, we show here that angulin proteins ILDR1 and ILDR2 are involved in alternative pre-mRNA splicing via binding to splicing factors TRA2A, TRA2B, or SRSF1.
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