Abstract
The mechanical loading of striated muscle is thought to play an important role in shaping bones and joints. Here, we examine skeletogenesis in late embryogenesis (embryonic day 18.5) in Myf5 −/− :MyoD −/− fetuses completely lacking striated muscle. The phenotype includes enlarged and fused cervical vertebrae and postural anomalies, some viscerocranial anomalies, long bone truncation and fusion, absent deltoid tuberosity of the humerus, scapular and clavicular hypoplasia, cleft palate, and cleft sternum. In contrast, neurocranial bone development was essentially normal. While the magnitude of individual effects varied throughout the skeletal system, the results are consistent with skeletal development depending on functional muscles. Novel abnormalities in the amyogenic fetuses relative to less severely paralyzed phenotypes extend our understanding of skeletogenic dependence on embryonic muscle contraction and static loading.
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Acknowledgements
This work was supported by grant 2004-2013 (Med-Project) from the Nova Scotia Health Research Foundation (NSHRF) and grants 238726-01 (to B.K.) and A5056 (to B.K.H.) from Natural Sciences and Engineering Research Council of Canada (NSERC). T.R. and K.J.D. are recipients of the NSERC Undergraduate Student Research Awards.
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Communicated by B. Herrmann
I. Rot-Nikcevic, T. Reddy, and K.J. Downing contributed equally to this work.
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Rot-Nikcevic, I., Reddy, T., Downing, K.J. et al. Myf5 −/− :MyoD −/− amyogenic fetuses reveal the importance of early contraction and static loading by striated muscle in mouse skeletogenesis. Dev Genes Evol 216, 1–9 (2006). https://doi.org/10.1007/s00427-005-0024-9
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DOI: https://doi.org/10.1007/s00427-005-0024-9