Abstract

incorporation of ({sup 35}S) methionine not trichloroacetic acid precipitable protein. Specific transcription of the MHC gene was examined by dot-blot analysis and was unaltered by contraction. Northern blot analysis of the MHC sequences detected by a cDNA probe revealed an mRNA sequence corresponding to a molecular weight of approximately 30 S. These data suggest that RNA synthesis and RNA content are unaltered by contraction in cultured heart cells and therefore the changes in myosin synthesis may be mediated at a post-transcriptional control level.

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