Gene- and Species-Specific Hox mRNA Translation by Ribosome Expansion Segments.
Gene- and Species-Specific Hox mRNA Translation by Ribosome Expansion Segments.
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DOI:
10.1016/j.molcel.2020.10.023
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发表时间:
2020-12-17
期刊:
影响因子:
16
通讯作者:
Barna M
中科院分区:
文献类型:
--
作者:
Leppek K;Fujii K;Quade N;Susanto TT;Boehringer D;Lenarčič T;Xue S;Genuth NR;Ban N;Barna M
Ribosomes have been suggested to directly control gene regulation, however regulatory roles for ribosomal RNA (rRNA) remain largely unexplored. Expansion segments (ESs) consist of multitudes of tentacle-like rRNA structures extending from the core ribosome in eukaryotes. ESs are remarkably variable in sequence and size across eukaryotic evolution with largely unknown functions. In characterizing ribosome binding to a regulatory element within a Homeobox (Hox) 5’ UTR, we unexpectedly identify a modular stem-loop within this element that binds to a single ES, ES9S. Engineering chimeric, “humanized” yeast ribosomes for ES9S reveals that an evolutionary change in the sequence of ES9S endows species-specific binding of Hoxa9 mRNA to the ribosome. Genome editing to site-specifically disrupt the Hoxa9-ES9S interaction demonstrates the functional importance for such selective mRNA-rRNA binding in translation control. Together, these studies unravel unexpected gene regulation directly mediated by rRNA and how ribosome evolution drives translation of critical developmental regulators. Leppek and colleagues describe a novel layer of gene regulation mediated directly by ribosomal RNA (rRNA). They demonstrate that extended regions of rRNA, called expansion segments, which vary in sequence and size across evolution, selectively interact with an RNA stem-loop in the Hoxa9 5’UTR to guide species- and gene-specific translation.
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