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Mol Cell. 2018 Feb 15;69(4):636-647.e7. doi: 10.1016/j.molcel.2018.01.019. Epub 2018 Feb 8.

N6-Methyladenosine Guides mRNA Alternative Translation during Integrated Stress Response.

Author information

1
Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA.
2
Max Planck Institute for Metabolism Research, Cologne 50931, Germany.
3
Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA. Electronic address: sq38@cornell.edu.

Abstract

The integrated stress response (ISR) facilitates cellular adaptation to stress conditions via the common target eIF2α. During ISR, the selective translation of stress-related mRNAs often relies on alternative mechanisms, such as leaky scanning or reinitiation, but the underlying mechanism remains incompletely understood. Here we report that, in response to amino acid starvation, the reinitiation of ATF4 is not only governed by the eIF2α signaling pathway, but is also subjected to regulation by mRNA methylation in the form of N6-methyladenosine (m6A). While depleting m6A demethylases represses ATF4 reinitiation, knocking down m6A methyltransferases promotes ATF4 translation. We demonstrate that m6A in the 5' UTR controls ribosome scanning and subsequent start codon selection. Global profiling of initiating ribosomes reveals widespread alternative translation events influenced by dynamic mRNA methylation. Consistently, Fto transgenic mice manifest enhanced ATF4 expression, highlighting the critical role of m6A in translational regulation of ISR at cellular and organismal levels.

KEYWORDS:

ATF4; FTO; QTI-seq; alternative translation; epitranscriptome; integrated stress response; m6A; reinitiation; ribosome scanning; start codon selection

PMID:
29429926
PMCID:
PMC5816726
DOI:
10.1016/j.molcel.2018.01.019
[Indexed for MEDLINE]
Free PMC Article

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