Key result
Tropomyosin isoform switching from larger isoforms (Tm1, Tm2, Tm3, Tm6) to smaller isoforms (Tm4, Tm5) was a transformation-induced change correlated with tumorigenicity in human fibroblasts.
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No immediate clinical implications; leaves open whether isoform switching drives tumorigenicity or serves as a biomarker in vivo.
Leavitt et al. (1986) studied Tumorigenicity in human fibroblasts. Carcinogen transformation vs. Normal diploid parental fibroblasts and nontumorigenic immortalized fibroblasts was evaluated on Relative rates of synthesis and abundance of individual Tm isoforms and actin. Tropomyosin isoform switching from larger isoforms (Tm1, Tm2, Tm3, Tm6) to smaller isoforms (Tm4, Tm5) was a transformation-induced change correlated with tumorigenicity in human fibroblasts.
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