Journal
CELL REPORTS
Volume 15, Issue 8, Pages 1782-1794Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2016.04.055
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Funding
- Swiss National Science Foundation [31003a_135794]
- NIH [P01 HG000205]
- Deutsche Forschungsgemeinschaft [STE 1422/3-1]
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The current understanding of gene expression considers transcription and translation to be independent processes. Challenging this notion, we found that translation efficiency is determined during transcription elongation through the imprinting of mRNAs with Not1, the central scaffold of the Ccr4-Not complex. We determined that another subunit of the complex, Not5, defines Not1 binding to specific mRNAs, particularly those produced from ribosomal protein genes. This imprinting mechanism specifically regulates ribosomal protein gene expression, which in turn determines the translational capacity of cells. We validate our model by SILAC and polysome profiling experiments. As a proof of concept, we demonstrate that enhanced translation compensates for transcriptional elongation stress. Taken together, our data indicate that in addition to defining mRNA stability, components of the Ccr4-Not imprinting complex regulate RNA translatability, thus ensuring global gene expression homeostasis.
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