Isolation of a cDNA clone from human fibroblasts encoding a muscle-type tropomyosin suggests it and skeletal muscle beta-tropomyosin derive from a common gene via alternative RNA splicing.
We have isolated a cDNA clone from a human fibroblast cDNA library that contains the entire protein-coding region of a 1.1-kilobase mRNA. This mRNA encodes a 284-amino acid tropomyosin, the primary structure of which most closely resembles smooth muscle tropomyosin. Thus, the expression of both 284-amino acid muscle-type and 247-amino acid non-muscle-type tropomyosins appears to be a normal feature of human non-muscle cells. We also present evidence to suggest that this cytoskeletal tropomyosin and a human skeletal muscle beta-tropomyosin are derived from a common structural gene by an alternative RNA splicing mechanism.
MacLeod et al. (Sun,) reported a other. Isolation of a cDNA clone from human fibroblasts encoding a muscle-type tropomyosin suggests it and skeletal muscle beta-tropomyosin derive from a common gene via alternative RNA splicing.
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