An RNA architectural locus control region involved in Dscam mutually exclusive splicing.

An RNA architectural locus control region involved in Dscam mutually exclusive splicing.
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参与 Dscam 互斥剪接的 RNA 结构位点控制区域

DOI:
10.1038/ncomms2269
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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在黑腹果蝇(Drosophila melanogaster)基因中,最引人注目的选择性剪接例子是唐氏综合症细胞粘附分子(Down syndrome cell adhesion molecule),它可以产生38,016种不同的亚型。RNA二级结构被认为是指导唐氏综合征细胞粘附分子的互斥剪接,但其潜在机制知之甚少。在这里,我们描述了一个基因座控制区,它可以激活外显子6簇,并特别允许选择只有一个外显子变异与对接位点选择序列相互作用的组合。结合比较基因组研究的63个物种的突变分析表明,复杂的,串联的多“亚基”RNA结构内的基因座控制区激活物种适当的替代变体。重要的是,加强靶外显子的弱剪接位点可以消除基因座控制区依赖性。我们的研究结果不仅提供了一个基因座控制区域依赖的机制,相互排斥剪接,但也提出了一个模型,在长距离RNA分子机器的复杂性增加的演变。
The most striking example of alternative splicing in a Drosophila melanogaster gene is observed in the Down syndrome cell adhesion molecule, which can generate 38,016 different isoforms. RNA secondary structures are thought to direct the mutually exclusive splicing of Down syndrome cell adhesion molecule, but the underlying mechanisms are poorly understood. Here we describe a locus control region that can activate the exon 6 cluster and specifically allow for the selection of only one exon variant in combination with docking site selector sequence interactions. Combining comparative genomic studies of 63 species with mutational analysis reveals that intricate, tandem multi-'subunit' RNA structures within the locus control region activate species-appropriate alternative variants. Importantly, strengthening the weak splice sites of the target exon can remove the locus control region dependence. Our findings not only provide a locus control region-dependent mechanism for mutually exclusive splicing, but also suggest a model for the evolution of increased complexity in a long-range RNA molecular machine.
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