RBM-5 modulates U2AF large subunit-dependent alternative splicing in C. elegans.

RBM-5 modulates U2AF large subunit-dependent alternative splicing in C. elegans.
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RBM-5 调节线虫中 U2AF 大亚基依赖性选择性剪接

DOI:
10.1080/15476286.2018.1526540
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发表时间:
2018
期刊:
影响因子:
4.1
通讯作者:
Ma L
Ma L
中科院分区:
生物学3区
文献类型:
--
作者:
Zhou C;Gao X;Hu S;Gan W;Xu J;Ma YC;Ma L

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mRNA 前体剪接的一个关键步骤是 U2AF 大亚基和小亚基对 3ʹ 剪接位点的识别,这一过程受众多反式作用剪接因子的调节。这些反式作用因子如何在体内与 U2AF 相互作用尚不清楚。通过筛选秀丽隐杆线虫 U2AF 大亚基基因 uaf-1(n4588) 突变体的温度敏感 (ts) 致死性抑制因子,我们鉴定了 RNA 结合基序基因 rbm-5(肿瘤抑制基因 RBM5 的同源物)中的突变。 rbm-5 突变可以通过功能丧失来抑制 uaf-1(n4588) ts 致死性,而 rbm-5 的神经元表达足以挽救这种抑制。转录组分析表明 uaf-1(n4588) 影响许多基因的表达,rbm-5 突变可以部分逆转异常基因表达至与野生型相似的水平。虽然 rbm-5 突变本身并不明显影响选择性剪接,但它们可以以基因特异性方式抑制或增强 uaf-1(n4588) 突变体中基因剪接的改变。具体来说,弱 3′ 剪接位点的识别更容易受到 rbm-5 的影响。我们的研究结果提供了新的体内证据,证明 RBM-5 可以调节 UAF-1 依赖性 RNA 剪接,并表明 RBM5 可能与 U2AF 大亚基相互作用以影响肿瘤形成。
A key step in pre-mRNA splicing is the recognition of 3ʹ splicing sites by the U2AF large and small subunits, a process regulated by numerous trans-acting splicing factors. How these trans-acting factors interact with U2AF in vivo is unclear. From a screen for suppressors of the temperature-sensitive (ts) lethality of the C. elegans U2AF large subunit gene uaf-1(n4588) mutants, we identified mutations in the RNA binding motif gene rbm-5, a homolog of the tumor suppressor gene RBM5. rbm-5 mutations can suppress uaf-1(n4588) ts-lethality by loss of function and neuronal expression of rbm-5 was sufficient to rescue the suppression. Transcriptome analyses indicate that uaf-1(n4588) affected the expression of numerous genes and rbm-5 mutations can partially reverse the abnormal gene expression to levels similar to that of wild type. Though rbm-5 mutations did not obviously affect alternative splicing per se, they can suppress or enhance, in a gene-specific manner, the altered splicing of genes in uaf-1(n4588) mutants. Specifically, the recognition of a weak 3ʹ splice site was more susceptible to the effect of rbm-5. Our findings provide novel in vivo evidence that RBM-5 can modulate UAF-1-dependent RNA splicing and suggest that RBM5 might interact with U2AF large subunit to affect tumor formation.
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