JANUS, a spliceosome-associated protein, promotes miRNA biogenesis in Arabidopsis.

JANUS, a spliceosome-associated protein, promotes miRNA biogenesis in Arabidopsis.
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DOI:
10.1093/nar/gkad1105
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发表时间:
2024-01-11
影响因子:
14.9
通讯作者:
--
中科院分区:
生物学2区
文献类型:
--
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MicroRNAs(MiRNAs)是基因表达的重要调节因子。它们的水平是通过调节微处理器复合体(MC)的活性来精确控制的。在这里,我们报告了Janus,一个在酵母和人类中保守的U2 SnRNP组装因子的同源物,是miRNA积累所必需的。Janus与MC组分Dice-like 1(DCL1)和Serrate(SE)结合,并直接结合pri-miRNAs的茎环。在亚型Janus突变体中,DCL1的活性、MC的数量以及初级miRNA转录本(pri-miRNAs)与MC的相互作用都会降低。这些数据表明,Janus通过与MC和/或pri-miRNAs的相互作用促进MC的组装和活性。此外,Janus还调控一些pri-miRNAs的转录,因为它结合了pri-miRNAs的启动子,促进了Pol II在其启动子上的占据。此外,在Janus中检测到全局剪接缺陷。综上所述,我们的研究揭示了保守剪接因子在miRNA生物发生中的一个新作用。
MicroRNAs (miRNAs) are important regulators of genes expression. Their levels are precisely controlled through modulating the activity of the microprocesser complex (MC). Here, we report that JANUS, a homology of the conserved U2 snRNP assembly factor in yeast and human, is required for miRNA accumulation. JANUS associates with MC components Dicer-like 1 (DCL1) and SERRATE (SE) and directly binds the stem-loop of pri-miRNAs. In a hypomorphic janus mutant, the activity of DCL1, the numbers of MC, and the interaction of primary miRNA transcript (pri-miRNAs) with MC are reduced. These data suggest that JANUS promotes the assembly and activity of MC through its interaction with MC and/or pri-miRNAs. In addition, JANUS modulates the transcription of some pri-miRNAs as it binds the promoter of pri-miRNAs and facilitates Pol II occupancy of at their promoters. Moreover, global splicing defects are detected in janus. Taken together, our study reveals a novel role of a conserved splicing factor in miRNA biogenesis.
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