Ribosome profiling reveals a functional role for autophagy in mRNA translational control.

Communications Biology
Juliet GoldsmithJayanta Debnath

Abstract

Autophagy promotes protein degradation, and therefore has been proposed to maintain amino acid pools to sustain protein synthesis during metabolic stress. To date, how autophagy influences the protein synthesis landscape in mammalian cells remains unclear. Here, we utilize ribosome profiling to delineate the effects of genetic ablation of the autophagy regulator, ATG12, on translational control. In mammalian cells, genetic loss of autophagy does not impact global rates of cap dependent translation, even under starvation conditions. Instead, autophagy supports the translation of a subset of mRNAs enriched for cell cycle control and DNA damage repair. In particular, we demonstrate that autophagy enables the translation of the DNA damage repair protein BRCA2, which is functionally required to attenuate DNA damage and promote cell survival in response to PARP inhibition. Overall, our findings illuminate that autophagy impacts protein translation and shapes the protein landscape.

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Citations

May 1, 2021·International Journal of Molecular Sciences·Sara Martín-VillanuevaJesús de la Cruz

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Methods Mentioned

BETA
PCR
pulldown
dotplot
immunoprecipitation
RIP
transgenic
genotyping
Flow Cytometry

Software Mentioned

Babel
ImageJ
RNALfold
FlowJo
ggplot2
R

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