Journal of Muscle Research & Cell Motility

, Volume 23, Issue 3, pp 255–264

Six and Eya expression during human somitogenesis and MyoD gene family activation

Authors

  • Françoise Fougerousse
    • URA CNRS 1923, Généthon
  • Muriel Durand
    • URA CNRS 1923, Généthon
  • Soledad Lopez
    • Département Génétique Développement et Pathologie Moleculaire, Institut Cochin, INSERM 567, CNRS 8104Université Paris V
  • Laurence Suel
    • URA CNRS 1923, Généthon
  • Josiane Demignon
    • Département Génétique Développement et Pathologie Moleculaire, Institut Cochin, INSERM 567, CNRS 8104Université Paris V
  • Charles Thornton
    • Department of Neurology, School of Medecine and DentistryUniversity of Rochester
  • Hidenori Ozaki
    • Department of BiologyJichi Medical school
  • Kyoshi Kawakami
    • Department of BiologyJichi Medical school
  • Patrick Barbet
    • IFR Cochin
  • Jacques S. Beckmann
    • Weizmann Institute of Science
  • Pascal Maire
    • URA CNRS 1923, Généthon
Article

DOI: 10.1023/A:1020990825644

Cite this article as:
Fougerousse, F., Durand, M., Lopez, S. et al. J Muscle Res Cell Motil (2002) 23: 255. doi:10.1023/A:1020990825644

Abstract

This report describes the characterisation of the expression profile of several myogenic determination genes during human embryogenesis. The data were obtained from axial structures and limb buds of human embryos aged between 3 and 8 weeks of development. Using in situ hybridisation to detect Pax3 and MyoD gene family mRNAs, and immunochemistry to follow Six and Eya protein accumulation, we have been able to establish the chronology of accumulation of these gene products. As in mouse, the first transcripts detected in myotomes of 3 week-old embryos are Pax3 and Myf5, followed by the expression of myogenin. MyoD appears to be activated well after Myf5, myogenin and MRF4 in the early myotome, whereas, in limb bud muscles, the presence of all four of these mRNAs is concomitant from 6 weeks. Six1, Six4 and Six5 homeoproteins are detected later than Myf5 activation. These Six homeoproteins are first observed in the cytoplasm of myogenin expressing cells. At later stages of development, Six1 and Six5, but not Six4, are translocated into the nuclei of myogenic cells, concomitantly with MyHCemb expression. Eya1 and Eya2 proteins, potential Six cofactors, were also detected in myogenin positive cells, but their accumulation was delayed and was mainly cytoplasmic. These results preclude that early activation of Myf5, myogenin and MRF4 is under the control of Six and Eya proteins, while Six and Eya proteins would be involved in later steps of myogenic differentiation.

Copyright information

© Kluwer Academic Publishers 2002