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Science. 2017 Sep 22;357(6357):1299-1303. doi: 10.1126/science.aan2399. Epub 2017 Aug 10.

Global mRNA polarization regulates translation efficiency in the intestinal epithelium.

Author information

1
Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.
2
Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.
3
Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel.
4
Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel. shalev.itzkovitz@weizmann.ac.il.

Abstract

Asymmetric messenger RNA (mRNA) localization facilitates efficient translation in cells such as neurons and fibroblasts. However, the extent and importance of mRNA polarization in epithelial tissues are unclear. Here, we used single-molecule transcript imaging and subcellular transcriptomics to uncover global apical-basal intracellular polarization of mRNA in the mouse intestinal epithelium. The localization of mRNAs did not generally overlap protein localization. Instead, ribosomes were more abundant on the apical sides, and apical transcripts were consequently more efficiently translated. Refeeding of fasted mice elicited a basal-to-apical shift in polarization of mRNAs encoding ribosomal proteins, which was associated with a specific boost in their translation. This led to increased protein production, required for efficient nutrient absorption. These findings reveal a posttranscriptional regulatory mechanism involving dynamic polarization of mRNA and polarized translation.

PMID:
28798045
PMCID:
PMC5955215
DOI:
10.1126/science.aan2399
[Indexed for MEDLINE]
Free PMC Article

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