Abstract

To investigate the genetic mechanisms involved in morphological transformation of Syrian hamster embryo (SHE) cells, we have studied the transforming potential of 3-aminobenzamide (3-AB). It was found that prolonged exposure to 3-AB induced morphological transformation of SHE cells as well as C3H10T 1/2 cells. At similar doses, 3-AB induced SCEs and chromosomal alterations (gaps, breaks and exchanges) in SHE cells, but no mutations at the hypoxanthine-guanine phosphoribosyl transferase locus. These data strongly suggest morphological transformation can result from genetic alterations other than gene mutations. The possible nature of these genetic alterations involved will be discussed.

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