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The Translational Landscape of the Human Heart.

Published on May 1, 2019in Cell36.22
· DOI :10.1016/j.cell.2019.05.010
Sebastiaan van Heesch (MDC: Max Delbrück Center for Molecular Medicine), Franziska Witte (MDC: Max Delbrück Center for Molecular Medicine)+ 53 AuthorsNorbert Hubner57
Estimated H-index: 57
Abstract
Summary Gene expression in human tissue has primarily been studied on the transcriptional level, largely neglecting translational regulation. Here, we analyze the translatomes of 80 human hearts to identify new translation events and quantify the effect of translational regulation. We show extensive translational control of cardiac gene expression, which is orchestrated in a process-specific manner. Translation downstream of predicted disease-causing protein-truncating variants appears to be frequent, suggesting inefficient translation termination. We identify hundreds of previously undetected microproteins, expressed from lncRNAs and circRNAs, for which we validate the protein products in vivo . The translation of microproteins is not restricted to the heart and prominent in the translatomes of human kidney and liver. We associate these microproteins with diverse cellular processes and compartments and find that many locate to the mitochondria. Importantly, dozens of microproteins are translated from lncRNAs with well-characterized noncoding functions, indicating previously unrecognized biology.
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