An alternative mode of microRNA target recognition.

An alternative mode of microRNA target recognition.
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DOI:
10.1038/nsmb.2230
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发表时间:
2012-02-12
影响因子:
16.8
通讯作者:
Darnell, Robert B.
Darnell, Robert B.
中科院分区:
生物学1区
文献类型:
--
作者:
Chi, Sung Wook;Hannon, Gregory J.;Darnell, Robert B.

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MicroRNAs(MiRNAs)通过与其种子区域(位置2-7)完美配对来调节mRNA靶标。最近,通过高通量测序与ArgAerte相关的~50个核苷酸RNA标签簇(AGO HITS-CLIP),生成了小鼠脑内miRNA相互作用位点的精确全基因组图谱。通过分析AGO HITS-CLIP“孤儿簇”-AGO来自HITS-CLIP的结合区,我们已经确定了miRNAs使用的另一种结合模式。具体地说,大脑中的G-凸起部位(位置5-6)往往受miR-124的结合和调节。更广泛地说,在小鼠脑中,膨胀的位点占所有AGO-≥相互作用的15%(≥1441个位点),并且在进化上是保守的。我们将位置6命名为“枢轴”核苷酸,并提出了一个模型,在该模型中,过渡性的“核-凸起”导致功能凸起的mRNA-miRNA相互作用,扩大了潜在的miRNA调节位点的数量。
MicroRNAs (miRNAs) regulate mRNA targets through perfect pairing with their seed region (position 2-7). Recently, a precise genome-wide map of miRNA interaction sites in mouse brain was generated by high-throughput sequencing of clusters of ~50 nucleotide RNA tags associated with Argonaute (Ago HITS-CLIP). By analyzing Ago HITS-CLIP “orphan clusters” – Ago binding regions from HITS-CLIP that cannot be explained by canonical seed matches – we have identified an alternative binding mode used by miRNAs. Specifically, G-bulge sites (position 5-6) are often bound and regulated by miR-124 in brain. More generally, bulged sites comprise ≥ 15% (≥ 1441 sites) of all Ago-miRNA interactions in mouse brain and are evolutionally conserved. We have termed position 6 the “pivot” nucleotide and suggest a model in which a transitional “nucleation-bulge” leads to functional bulge mRNA-miRNA interactions, expanding the number of potential miRNA regulatory sites.
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