Cited by 1,477PI3K/AKT/mTOR signaling in cancerRNA and protein synthesis mechanismsMetabolism, Diabetes, and Cancer

A unifying model for mTORC1-mediated regulation of mRNA translation

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Thoreen, Carson C., Chantranupong, Lynne, Keys, Heather R., Wang, Tim, Gray, Nathanael S., Sabatini, David M.·2012·Nature

Abstract

The mTOR complex 1 (mTORC1) kinase nucleates a pathway that promotes cell growth and proliferation and is the target of rapamycin, a drug with many clinical uses. mTORC1 regulates messenger RNA translation, but the overall translational program is poorly defined and no unifying model exists to explain how mTORC1 differentially controls the translation of specific mRNAs. Here we use high-resolution transcriptome-scale ribosome profiling to monitor translation in mouse cells acutely treated with the mTOR inhibitor Torin 1, which, unlike rapamycin, fully inhibits mTORC1 (ref. 2). Our data reveal a surprisingly simple model of the mRNA features and mechanisms that confer mTORC1-dependent translation control. The subset of mRNAs that are specifically regulated by mTORC1 consists almost entirely of transcripts with established 5' terminal oligopyrimidine (TOP) motifs, or, like Hsp90ab1 and Ybx1, with previously unrecognized TOP or related TOP-like motifs that we identified. We find no evidence to support proposals that mTORC1 preferentially regulates mRNAs with increased 5' untranslated region length or complexity. mTORC1 phosphorylates a myriad of translational regulators, but how it controls TOP mRNA translation is unknown. Remarkably, loss of just the 4E-BP family of translational repressors, arguably the best characterized mTORC1 substrates, is sufficient to render TOP and TOP-like mRNA translation resistant to Torin 1. The 4E-BPs inhibit translation initiation by interfering with the interaction between the cap-binding protein eIF4E and eIF4G1. Loss of this interaction diminishes the capacity of eIF4E to bind TOP and TOP-like mRNAs much more than other mRNAs, explaining why mTOR inhibition selectively suppresses their translation. Our results clarify the translational program controlled by mTORC1 and identify 4E-BPs and eIF4G1 as its master effectors.

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  • qPCR can quantify RP mRNAs transcribed by Pol II but cannot confirm whether they are actively translated by existing ribosomes.

    “qPCR can quantify the abundance of these RP mRNAs transcribed by Pol II, but it cannot confirm whether these transcripts are actively being translated by existing ribosomes in the sarcoplasm [75].”

    From Ribosome Biogenesis as a Putative Bottleneck to Skeletal Muscle Hypertrophy: Mechanisms, Human Evidence, and Practical Modulators (2026) · cites this paper as [75]

    The paper’s Abstract distinguishes transcript abundance from translation: it normalizes ribosome-footprint measurements to mRNA abundance to separate translational and transcriptional regulation. The Methods Summary measures abundance by mRNA profiling, not qPCR; the copy does not specifically discuss Pol II transcription or translation in the sarcoplasm. (LLM, conf=0.84)

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  • The mRNAs encoding the ~80 ribosomal proteins possess a unique 5′ terminal oligopyrimidine tract that strictly regulates their translation via the mTORC1/eIF4E signaling axis.

    “The mRNAs encoding the ~80 ribosomal proteins possess a unique 5′ terminal oligopyrimidine (5′ TOP) tract, which strictly regulates their translation via the mTORC1/eIF4E signaling axis [74,75].”

    From Ribosome Biogenesis as a Putative Bottleneck to Skeletal Muscle Hypertrophy: Mechanisms, Human Evidence, and Practical Modulators (2026) · cites this paper as [75]

    The paper reports that Torin1 suppresses translation of nearly all cytoplasmic ribosomal-protein mRNAs and explains how mTORC1 regulates TOP-mRNA translation through 4E-BPs, eIF4E and eIF4G1 (sections labeled Abstract; page unavailable). It does not establish the stated count of approximately 80 or that the TOP tract is unique to ribosomal-protein mRNAs; it identifies other TOP and TOP-like mRNAs and notes a ribosomal-protein exception, Rps27a. (LLM, conf=0.86)

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Authors
Thoreen, C. C., Chantranupong, L., Keys, H. R., Wang, T., Gray, N. S., & Sabatini, D. M.
Affiliations
  • Dana-Farber Cancer Institute (US)
  • Broad Institute (US)
  • Howard Hughes Medical Institute (US)
  • Harvard University (US)
Corresponding author
  • Gray, Nathanael S.
  • Sabatini, David M.
Venue
Nature
Published
2012-05
Volume
485
Issue
7396
Pages
109-113
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2136272779
Cited by
1,477
References
41
Citations by year
2026: 75 · 2025: 87 · 2024: 78 · 2023: 98 · 2022: 97 · 2021: 95 · 2020: 124 · 2019: 123 · 2018: 125 · 2017: 98 · 2016: 103 · 2015: 118 · 2014: 139 · 2013: 93 · 2012: 22
FWCI
47.79
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • PMC
Funders
  • Howard Hughes Medical Institute
  • National Cancer Institute (CA129105, CA103866, R01CA103866, R01CA129105)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
mTORC1, mRNA translation regulation, 4E-BP1, translational repressor, ribosome profiling, Torin1, rapamycin, prostate cancer, tumor invasion, HSP90AB1, YB-1, mTOR signaling, translational regulation
MeSH terms
Mechanistic Target of Rapamycin Complex 1, Animals, Base Sequence, Gene Expression Regulation, Humans, Male, Models, Biological, Naphthyridines, Phosphorylation, Prostatic Neoplasms, Protein Binding, Proteins, Ribosomes, RNA, Messenger, Protein Biosynthesis, 5' Untranslated Regions, Eukaryotic Initiation Factor-4E, Eukaryotic Initiation Factor-4G, Cell Line, Tumor, Multiprotein Complexes, Mice, TOR Serine-Threonine Kinases, Nucleotide Motifs

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