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Trans-splicing of mRNAs links gene transcription to translational control regulated by mTOR

机译:MRNA的跨剪接将基因转录链接到MTOR调节的平移控制

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BACKGROUND:In phylogenetically diverse organisms, the 5' ends of a subset of mRNAs are trans-spliced with a spliced leader (SL) RNA. The functions of SL trans-splicing, however, remain largely enigmatic.RESULTS:We quantified translation genome-wide in the marine chordate, Oikopleura dioica, under inhibition of mTOR, a central growth regulator. Translation of trans-spliced TOP mRNAs was suppressed, consistent with a role of the SL sequence in nutrient-dependent translational control of growth-related mRNAs. Under crowded, nutrient-limiting conditions, O. dioica continued to filter-feed, but arrested growth until favorable conditions returned. Upon release from unfavorable conditions, initial recovery was independent of nutrient-responsive, trans-spliced genes, suggesting animal density sensing as a first trigger for resumption of development.CONCLUSION:Our results are consistent with a proposed role of trans-splicing in the coordinated translational down-regulation of nutrient-responsive genes under growth-limiting conditions.
机译:背景:在系统源性不同的生物中,MRNA子集的5'末端用拼接前导件(SL)RNA反式剪接。然而,SL型剪接的功能仍然很大程度上是神秘的。结果:我们在抑制MTOR,中央生长调节剂的MTOR中量化在海洋脊索oikopleura dioica中的翻译基因组。抑制了转腐碎片顶部MRNA的翻译,符合SL序列在生长相关MRNA的营养依赖性平移控制中的作用。在拥挤,营养限制条件下,O. DioICA继续过滤饲料,但持续增长,直至返回有利条件。在不利的条件下释放时,初始恢复与营养响应性逆剪接基因无关,表明动物密度感应作为恢复发育的第一个触发。结论:我们的结果与协调的跨剪接作用一致生长限制条件下的营养响应基因的翻译下调。

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