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Analysis of chick somite myogenesis by in situ confocal microscopy of desmin expression
WH Borman and DE Yorde
Department of Cellular Biology and Anatomy, Medical College of Wisconsin, Milwaukee 53226.
We explored the relationship in chick embryos between somitogenesis and the onset of somite myogenesis by immunodetection of the muscle- specific intermediate filament protein desmin. Early somite desmin expression was detected by whole-mount in situ confocal microscopy. No detectable somite desmin was observed in embryos of 15 somites (Stage 12) or younger. In embryos having between 16 and 26 somites (Stages 12- 15), desmin could be detected in somites positioned increasingly more caudal in the embryo. Finally, in embryos of 27 somites (Stage 16) and older, somite desmin expression was consistently present in all but the caudal-most six somites. Although the rate of somite formation is fairly constant, the rate of observed somite desmin expression progressing caudally in the embryo is greater initially than the rate of segmentation. After an embryo has formed about 27 somites, the rate of desmin appearance parallels the rate of segmentation at a distance of about six somites. This result suggests that very early somite myogenesis is not linked to somitogenesis.
Volume 42,
Issue 2,
pp. 265-272,
02/01/1994
Copyright © 1994 by The Histochemical Society
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