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

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 and 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 and Together, we demonstrate that cells exhibiting characteristics of human fetal satellite cells can be produced from iPSC, opening interesting avenues for muscular dystrophy cell therapy. This work provides significant insights into the development of the human myogenic lineage.