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Science 29 June 1984:
Vol. 224. no. 4656, pp. 1436 - 1438
DOI: 10.1126/science.6729461
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Articles

Science, Vol 224, Issue 4656, 1436-1438
Copyright © 1984 by American Association for the Advancement of Science

articles

alpha-Cardiac actin is the major sarcomeric isoform expressed in embryonic avian skeletal muscle

BM Paterson and JD Eldridge

A primer extension assay that is diagnostic for the messenger RNA's (mRNA's) transcribed from the beta-cytoplasmic, alpha-cardiac, and alpha-skeletal actin genes of the chicken was used to measure the mRNA levels for these actin isoforms. Measurements were made in chicken breast muscle during myogenesis in vivo and in vitro. alpha-Cardiac actin mRNA accounts for more than 90 percent of the sarcomeric actin transcripts expressed in avian embryonic breast muscle. Five weeks after hatching, alpha-skeletal actin mRNA is the only detectable sarcomeric actin transcript.


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An avian muscle factor related to MyoD1 activates muscle-specific promoters in nonmuscle cells of different germ-layer origin and in BrdU-treated myoblasts..
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