Staufen1 inhibits MyoD translation to actively maintain muscle stem cell quiescence

Proceedings of the National Academy of Sciences of the United States of America
Antoine de MorréeThomas A Rando

Abstract

Tissue regeneration depends on the timely activation of adult stem cells. In skeletal muscle, the adult stem cells maintain a quiescent state and proliferate upon injury. We show that muscle stem cells (MuSCs) use direct translational repression to maintain the quiescent state. High-resolution single-molecule and single-cell analyses demonstrate that quiescent MuSCs express high levels of Myogenic Differentiation 1 (MyoD) transcript in vivo, whereas MyoD protein is absent. RNA pulldowns and costainings show that MyoD mRNA interacts with Staufen1, a potent regulator of mRNA localization, translation, and stability. Staufen1 prevents MyoD translation through its interaction with the MyoD 3'-UTR. MuSCs from Staufen1 heterozygous (Staufen1+/-) mice have increased MyoD protein expression, exit quiescence, and begin proliferating. Conversely, blocking MyoD translation maintains the quiescent phenotype. Collectively, our data show that MuSCs express MyoD mRNA and actively repress its translation to remain quiescent yet primed for activation.

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Citations

Feb 3, 2018·Journal of Biochemistry·So-Ichiro Fukada
May 20, 2020·Open Biology·William ChenMichael A Rudnicki
Jan 21, 2021·Clinical Epigenetics·Anna RugowskaPatryk Konieczny
Feb 6, 2021·BMC Cancer·Kristen A MarcellusBernard J Jasmin
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Mar 7, 2021·Trends in Cell Biology·Sara AncelJerome N Feige
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Nov 11, 2020·Developmental Cell·Océane Marescal, Iain M Cheeseman

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