Mouse myotomes pairs exhibit left-right asymmetric expression of MLC3F and α-skeletal actin

Golding, Jon P.; Partridge, Terence A.; Beauchamp, Jonathan R.; King, Tim; Brown, Nigel A.; Gassmann, Martin and Zammit, Peter S. (2004). Mouse myotomes pairs exhibit left-right asymmetric expression of MLC3F and α-skeletal actin. Developmental Dynamics, 231(4) pp. 795–800.

DOI: https://doi.org/10.1002/dvdy.20176

Abstract

Most muscle originates from the myotomal compartment of the somites, paired structures flanking the neural tube. Whereas vertebrate embryos show molecular and morphological asymmetry about the left-right body axis, somitic myogenesis is thought to occur symmetrically. Here, we provide the first evidence that myotome pairs are transiently left-right asymmetric, with higher expression of α-skeletal actin and myosin light chain 3F (MLC3F) on the left side between embryonic day 9.5-10.25. In iv mutants with situs inversus, the asymmetric expression of α-skeletal actin and MLC3F was inverted, showing that this process is regulated by global left-right axis cues, initiated before gastrulation. However, although left-sided identity is later maintained by Pitx2 genes, we found that Pitx2c null embryos have normal left-biased expression of α-skeletal actin and MLC3F. Myotome asymmetry, therefore, is downstream of the iv mutation but upstream of, or unrelated to, the Pitx2c pathway.

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