Structure, evolution and function of the bi-directionally transcribed iab-4/iab-8 microRNA locus in arthropods.

Structure, evolution and function of the bi-directionally transcribed iab-4/iab-8 microRNA locus in arthropods.
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DOI:
10.1093/nar/gks1445
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发表时间:
2013-03-01
影响因子:
14.9
通讯作者:
Ronshaugen M
Ronshaugen M
中科院分区:
生物学2区
文献类型:
--
作者:
Hui JH;Marco A;Hunt S;Melling J;Griffiths-Jones S;Ronshaugen M

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在黑腹果蝇中,iab-4/iab-8基因座编码双向转录的microrna,调控侧翼Hox转录因子的功能。研究结果表明,iab-4/iab-8基因座的双向转录、时空表达模式和Hox调控功能在苍蝇和甲虫Tribolium castaneum之间是保守的。计算预测表明,iab-4和iab-8 microrna可以靶向共同的位点,细胞培养实验证实,iab-4和iab-8的功能在苍蝇和甲虫的Hox靶点上重叠。然而,我们观察到Hox基因靶向方式的关键差异。例如,在果蝇中,abd-A转录本仅被iab-8靶向,而iab-4和iab-8都与Tribolium abd-A结合。我们对一个双向转录的microRNA的进化和功能表征,建立了iab-4/iab-8系统作为一个模型,用于理解来自正义和反义microRNA的多种产物如何靶向共同位点。
In Drosophila melanogaster, the iab-4/iab-8 locus encodes bi-directionally transcribed microRNAs that regulate the function of flanking Hox transcription factors. We show that bi-directional transcription, temporal and spatial expression patterns and Hox regulatory function of the iab-4/iab-8 locus are conserved between fly and the beetle Tribolium castaneum. Computational predictions suggest iab-4 and iab-8 microRNAs can target common sites, and cell-culture assays confirm that iab-4 and iab-8 function overlaps on Hox target sites in both fly and beetle. However, we observe key differences in the way Hox genes are targeted. For instance, abd-A transcripts are targeted only by iab-8 in Drosophila, whereas both iab-4 and iab-8 bind to Tribolium abd-A. Our evolutionary and functional characterization of a bi-directionally transcribed microRNA establishes the iab-4/iab-8 system as a model for understanding how multiple products from sense and antisense microRNAs target common sites.
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