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Satellite cell depletion results in a cryptic subpopulation of myonuclei in response to exercise

ABSTRACT: Skeletal muscle is composed of post-mitotic myofibers that form a syncytium containing hundreds of myonuclei. Using a progressive exercise training model in the mouse and single nucleus RNA-sequencing (snRNA-seq) for high resolution characterization of myonuclear transcription, we show myonuclear functional specialization in muscle from sedentary mice that is altered by 4 weeks of exercise training. Furthermore, in response to exercise, snRNA-seq reveals that resident muscle stem cells, satellite cells, were activated, but demonstrated limited lineage progression while contributing to muscle adaption. In the absence of satellite cells, trajectory analysis predicts the emergence of cryptic myonuclei that appear to lose their canonical identity. These data illustrate how myonuclear adaptation to exercise may be disrupted under conditions satellite cell compromise.

ORGANISM(S): Mus musculus

PROVIDER: GSE162307 | GEO | 2021/07/17

REPOSITORIES: GEO

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Satellite cell depletion results in a cryptic subpopulation of myonuclei in response to exercise

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