Versatility of MicroRNA biogenesis.

Versatility of MicroRNA biogenesis.
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DOI:
10.1371/journal.pone.0019391
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发表时间:
2011-05-10
期刊:
影响因子:
3.7
通讯作者:
Shomron N
Shomron N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Volk N;Shomron N

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microRNA(miRNAs)是调节基因表达的短单链RNA分子。miRNAs起源于大的初级(pri)和前体(pre)转录物,其沿着其生物发生途径经历各种加工步骤沿着直至它们达到其成熟和功能形式。然而,目前尚不清楚是否所有的miRNAs都是类似地加工的。在这里,我们发现前体miRNA和成熟miRNA形式之间的比例在不同的miRNA之间存在差异。此外,参与miRNA生物发生的几个因子,包括Exportin-5,Drosha,NF 90 a,NF 45和KSRP的过表达,对前/成熟miRNA比率显示出双向作用,表明它们复杂的生物发生敏感性。在试图确定可能解释miRNA生物发生多功能性的其他因素时,我们分析了两个hnRNP家族成员hnRNPH 1和hnRNPR的贡献。这些基因的敲低或过表达表明,hnRNPR抑制,而hnRNPH 1促进,miRNA加工。总的来说,我们的研究结果强调了miRNA的生物发生是多方面的。
MicroRNAs (miRNAs) are short single-stranded RNA molecules that regulate gene expression. MiRNAs originate from large primary (pri) and precursor (pre) transcripts that undergo various processing steps along their biogenesis pathway till they reach their mature and functional form. It is not clear, however, whether all miRNAs are processed similarly. Here we show that the ratio between pre-miRNA and mature miRNA forms varies between different miRNAs. Moreover, over-expression of several factors involved in miRNA biogenesis, including Exportin-5, Drosha, NF90a, NF45 and KSRP, displayed bidirectional effects on pre/mature miRNA ratios, suggesting their intricate biogenesis sensitivity. In an attempt to identify additional factors that might explain the versatility in miRNA biogenesis we have analyzed the contribution of two hnRNP family members, hnRNPH1 and hnRNPR. Knock-down or over-expression of these genes suggested that hnRNPR inhibits, whereas hnRNPH1 facilitates, miRNA processing. Overall, our results emphasize that miRNA biogenesis is versatile.
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