Aug 1, 1988

Genetic analysis of indefinite division in human cells: identification of four complementation groups

Proceedings of the National Academy of Sciences of the United States of America
O M Pereira-Smith, J R Smith


Hybrids obtained following fusion of normal human diploid fibroblasts with different immortal human cell lines exhibited limited division potential. This led to the conclusion that the phenotype of cellular senescence is dominant and that immortal cells arise as a result of recessive changes in the growth control mechanisms of the normal cell. We have exploited the fact that immortality is recessive and, by fusing immortal human cell lines with each other, assigned 21 cell lines to at least four complementation groups for indefinite division. A wide variety of cell lines was included in the study to determine what parameters, if any, would affect complementation group assignment. The results indicate that cell type, embryonal layer of origin, and type of tumor do not affect group assignment. There does not appear to be any correlation between expression of an activated oncogene and group assignment. However, all of the immortal simian virus 40-transformed cell lines studied (with the exception of one xerodermapigmentosum fibroblast-derived line) assign to the same group, indicating that this virus immortalizes various human cells by the same processes. The assignment of immortal human cells to distinct groups provides the basis...Continue Reading

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Mentioned in this Paper

Genes, Regulator
Cell Division Phases
Hybrid Cells
Cell Survival
Cell Line, Transformed

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