SOX7 Is Required for Muscle Satellite Cell Development and Maintenance

Stem Cell Reports. 2017 Oct 10;9(4):1139-1151. doi: 10.1016/j.stemcr.2017.08.014. Epub 2017 Sep 21.


Satellite cells are skeletal-muscle-specific stem cells that are activated by injury to proliferate, differentiate, and fuse to enable repair. SOX7, a member of the SRY-related HMG-box family of transcription factors is expressed in quiescent satellite cells. To elucidate SOX7 function in skeletal muscle, we knocked down Sox7 expression in embryonic stem cells and primary myoblasts and generated a conditional knockout mouse in which Sox7 is excised in PAX3+ cells. Loss of Sox7 in embryonic stem cells reduced Pax3 and Pax7 expression. In vivo, conditional knockdown of Sox7 reduced the satellite cell population from birth, reduced myofiber caliber, and impaired regeneration after acute injury. Although Sox7-deficient primary myoblasts differentiated normally, impaired myoblast fusion and increased sensitivity to apoptosis in culture and in vivo were observed. Taken together, these results indicate that SOX7 is dispensable for myogenesis but is necessary to promote satellite cell development and survival.

Keywords: PAX3; PAX7; SOX7; conditional knockout; embryonic stem cell; muscle regeneration; muscle satellite cells; myogenesis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Differentiation / genetics*
  • Cell Line
  • Cell Self Renewal / genetics*
  • Cell Survival / genetics
  • Embryonic Stem Cells / cytology
  • Embryonic Stem Cells / metabolism
  • Gene Expression
  • Gene Knockout Techniques
  • Mice
  • Mice, Knockout
  • Muscle Development
  • Muscle Fibers, Skeletal / physiology
  • Myoblasts / cytology
  • Myoblasts / metabolism
  • Regeneration
  • SOXF Transcription Factors / genetics*
  • Satellite Cells, Skeletal Muscle / cytology*
  • Satellite Cells, Skeletal Muscle / metabolism*


  • SOXF Transcription Factors
  • Sox7 protein, mouse