Quantification of Myosin Heavy‐Chain mRNA during Myogenesis

Abstract
Complementary DNA (cDNA) was synthesized from a 26-S poly(A)-containing RNA fraction consisting predominately of myosin mRNA and used to quantitative the amounts of myosin mRNA during development. RNA .cntdot. cDNAmyosin hybridizations were performed with RNA isolated from tertiary cultures of 10 day old chick embryo fibroblasts and the proportion of myosin RNA determined. The levels of myosin RNA present in primary 11 day old chick embryo myoblast cultures undergoing development were also analyzed by RNA .cntdot. cDNAmyosin hybridizations. Correlation of these values with the rate of myosin H chain synthesis indicated that myosin mRNA was subject to post-transcriptional or translational control.