Differentiation of the human PAX7-positive myogenic precursors/satellite cell lineage in vitro

Development. 2020 Jun 26;147(12):dev187344. doi: 10.1242/dev.187344.

Abstract

Satellite cells (SC) are muscle stem cells that can regenerate adult muscles upon injury. Most SC originate from PAX7+ myogenic precursors set aside during development. Although myogenesis has been studied in mouse and chicken embryos, little is known about human muscle development. Here, we report the generation of human induced pluripotent stem cell (iPSC) reporter lines in which fluorescent proteins have been introduced into the PAX7 and MYOG loci. We use single cell RNA sequencing to analyze the developmental trajectory of the iPSC-derived PAX7+ myogenic precursors. We show that the PAX7+ cells generated in culture can produce myofibers and self-renew in vitro and in vivo Together, we demonstrate that cells exhibiting characteristics of human fetal satellite cells can be produced in vitro from iPSC, opening interesting avenues for muscular dystrophy cell therapy. This work provides significant insights into the development of the human myogenic lineage.

Keywords: Human development; PAX7; Pluripotent stem cell; Satellite cell; Skeletal muscle.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • CRISPR-Cas Systems / genetics
  • Cell Differentiation*
  • Cell Lineage
  • Cell Self Renewal
  • Cells, Cultured
  • Genes, Reporter
  • Genetic Loci
  • Humans
  • Induced Pluripotent Stem Cells / cytology
  • Induced Pluripotent Stem Cells / metabolism
  • Muscle Fibers, Skeletal / cytology
  • Muscle Fibers, Skeletal / metabolism
  • Myogenin / genetics
  • PAX7 Transcription Factor / genetics
  • PAX7 Transcription Factor / metabolism*
  • RNA, Guide, CRISPR-Cas Systems
  • Satellite Cells, Skeletal Muscle / cytology
  • Satellite Cells, Skeletal Muscle / metabolism*

Substances

  • MYOG protein, human
  • Myogenin
  • PAX7 Transcription Factor
  • PAX7 protein, human