Degenerative and regenerative pathways underlying Duchenne muscular dystrophy revealed by single-nucleus RNA sequencing

Francesco Chemello, Zhaoning Wang, Hui Li, John R. McAnally, Ning Liu, Rhonda Bassel-Duby, Eric N. Olson

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Duchenne muscular dystrophy (DMD) is a fatal muscle disorder characterized by cycles of degeneration and regeneration of multinucleated myofibers and pathological activation of a variety of other muscle-associated cell types. The extent to which different nuclei within the shared cytoplasm of a myofiber may display transcriptional diversity and whether individual nuclei within a multinucleated myofiber might respond differentially to DMD pathogenesis is unknown. Similarly, the potential transcriptional diversity among nonmuscle cell types within dystrophic muscle has not been explored. Here, we describe the creation of a mouse model of DMD caused by deletion of exon 51 of the dystrophin gene, which represents a prevalent disease-causing mutation in humans. To understand the transcriptional abnormalities and heterogeneity associated with myofiber nuclei, as well as other mononucleated cell types that contribute to the muscle pathology associated with DMD, we performed single-nucleus transcriptomics of skeletal muscle of mice with dystrophin exon 51 deletion. Our results reveal distinctive and previously unrecognized myonuclear subtypes within dystrophic myofibers and uncover degenerative and regenerative transcriptional pathways underlying DMD pathogenesis. Our findings provide insights into the molecular underpinnings of DMD, controlled by the transcriptional activity of different types of muscle and nonmuscle nuclei.

Original languageEnglish (US)
Pages (from-to)29691-29701
Number of pages11
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number47
DOIs
StatePublished - Nov 24 2020

Keywords

  • DMD mouse model
  • Dystrophin
  • Myofibers
  • Myonuclei
  • Skeletal muscle

ASJC Scopus subject areas

  • General

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