Nature Cell Biology 8, 677 - 682 (2006)
Published online: 25 June 2006; | doi:10.1038/ncb1425
Asymmetric division and cosegregation of template DNA strands in adult muscle satellite cellsVasily Shinin, Barbara Gayraud-Morel, Danielle Gomès
& Shahragim Tajbakhsh
Stem Cells and Development, Department of Developmental Biology, Pasteur Institute, CNRS URA 2578, 25 rue du Dr. Roux, 75724 Paris Cedex 15, France.
Correspondence should be addressed to Shahragim Tajbakhsh shaht@pasteur.fr Satellite cells assure postnatal skeletal muscle growth and repair. Despite extensive studies, their stem cell character remains largely undefined. Using pulse-chase labelling with BrdU to mark the putative stem cell niche, we identify a subpopulation of label-retaining satellite cells during growth and after injury. Strikingly, some of these cells display selective template-DNA strand segregation during mitosis in the muscle fibre in vivo, as well as in culture independent of their niche, indicating that genomic DNA strands are nonequivalent. Furthermore, we demonstrate that the asymmetric cell-fate determinant Numb segregates selectively to one daughter cell during mitosis and before differentiation, suggesting that Numb is associated with self-renewal. Finally, we show that template DNA cosegregates with Numb in label-retaining cells that express the self-renewal marker Pax7. The cosegregation of 'immortal' template DNA strands and their link with the asymmetry apparatus has important implications for stem cell biology and cancer.
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