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© Research
Publication : Cell reports

Dynamics of Asymmetric and Symmetric Divisions of Muscle Stem Cells In Vivo and on Artificial Niches.

Team: Stem Cells And Development
Member: Sara Khalilian
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Cell reports - 10 Mar 2020

Evano B, Khalilian S, Le Carrou G, Almouzni G, Tajbakhsh S,

Link to Pubmed [PMID] – 32160529

Link to DOI – S2211-1247(20)30131-510.1016/j.celrep.2020.01.097

Cell Rep 2020 03; 30(10): 3195-3206.e7

Stem cells can be maintained through symmetric cell divisions (SCDs) and asymmetric cell divisions (ACDs). How and when these divisions occur in vivo in vertebrates is poorly understood. Here, we developed a clonogenic cell tracing method that demonstrates the asymmetric distribution of transcription factors along with old and new DNA in mouse muscle stem cells during skeletal muscle regeneration. Combining single-cell tracking and artificial niches ex vivo, we show how cells switch from ACDs to SCDs, suggesting that they are not engaged in an obligate mode of cell division. Further, we generated SNAP-tagged histone H3-reporter mice and find that, unlike fly germline stem cells, differential fate outcomes are associated with a symmetric distribution of the H3.1 and H3.3 histone variants in mouse muscle stem cells. This versatile and efficient H3-SNAP labeling system will allow an investigation of mechanisms underlying the maintenance of epigenomic identity and plasticity in a variety of tissues.