Quantitation of the frequency of immortalization of normal human diploid fibroblasts by SV40 large T-antigen - PubMed (original) (raw)
Quantitation of the frequency of immortalization of normal human diploid fibroblasts by SV40 large T-antigen
J W Shay et al. Exp Cell Res. 1989 Sep.
Abstract
The mechanism by which SV40 large T-antigen immortalizes human lung fibroblasts is not yet understood, and the frequency with which immortalization occurs is unknown. Here we report detailed studies of the kinetics of immortalization. Approximately 20-50% of individual T-antigen transfected clones of IMR-90 human lung fibroblasts are able to immortalize. The failure of some clones to immortalize is consistent with the hypothesis that in some cells the aneuploidy induced by T-antigen produces extra copies of the chromosome containing a factor that must be inactivated before immortalization occurs. Within immortalization-competent clones, the frequency of immortalization is about 3 X 10(-7). This frequency is consistent with a mutational mechanism for the inactivation of the factor that causes crisis in T-antigen expressing cells.
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