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The lin-4 microRNA: The ultimate micromanager

机译:lin-4 microRNA:最终的微管理器

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摘要

MicroRNAs (miRNAs) are full of surprises. The more we study these ~22-nucleotide non-coding RNAs, the more we realize how little is understood about this mode of gene regulation. Case in point: lin-4, the founding member of the miRNA superfamily discovered over 20 years ago. Thousands of miRNAs have since been discovered in plant, animal, and viral genomes. They direct important cellular processes, such as proliferation, apoptosis, differentiation, metabolic and immune responses. Mounting evidence supports the canonical view that miRNAs function to block expression of their targets by associating in a sequence-specific manner to messenger RNA (mRNA) transcripts, causing mRNA degradation and/ or translational repression. A recent report by Turner et al. offers an expanded function for miRNAs in regulating gene expression. Their work, focusing on lin-4, suggests that miRNAs can bind to their own promoters to induce their transcription-a process referred to as RNA activation (RNAa).
机译:MicroRNA(miRNA)充满惊喜。我们越研究这些约22个核苷酸的非编码RNA,我们就越了解关于这种基因调控模式的知识很少。例如:lin-4,是20年前发现的miRNA超家族的创始成员。此后在植物,动物和病毒基因组中发现了成千上万的miRNA。它们指导重要的细胞过程,例如增殖,凋亡,分化,代谢和免疫反应。越来越多的证据支持以下规范观点:miRNA通过以序列特异性方式与信使RNA(mRNA)转录物相关联,从而导致mRNA降解和/或翻译抑制,从而起到阻断其靶标表达的作用。 Turner等人的最新报告。为miRNA调控基因表达提供了扩展功能。他们专注于lin-4的工作表明,miRNA可以与自己的启动子结合以诱导其转录,这一过程称为RNA激活(RNAa)。

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