Analysis of CRE-mediated recombination driven by myosin light chain 1/3 regulatory elements in embryonic and adult skeletal muscle: a tool to study fiber specification

Foteini Mourkioti, Esfir Slonimsky, Marion Huth, Valeria Berno, Nadia Alicia Rosenthal

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8 Citations (Scopus)


An increasing number of genes have been implicated in skeletal muscle fiber diversity. To study the contribution of diverse genetic elements to the regulation of fiber-type composition, we generated a transgenic mouse in which CRE recombinase expression is driven by muscle-specific regulatory sequences of the myosin light chain 1/3 locus (MLC). Using ROSA26 conditional reporter mice, we detected expression of the MLC-Cre transgene starting from embryonic day 12.5 (E12.5). By E15, recombination was detected in all muscle-derived structures. Immunohistochemical analysis revealed CRE activity was restricted to fast-twitch (type II) and excluded from slow-twitch (type I) fibers of skeletal muscle. The MLC-Cre transgenic mouse can be used in conjunction with conditional alleles to study both developmental patterning and maintenance of fast fiber-type phenotypes.
Original languageEnglish
Pages (from-to)424 - 430
Number of pages7
Journalgenesis: The Journal of Genetics and Development
Issue number8
Publication statusPublished - 2008
Externally publishedYes

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