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The effects of oncogene activation on glycosphingolipid (GSL) synthesis by a mouse fibroblast clonal cell line were studied. A transfectant that expressed the activated ras gene showed a definite change in the composition of acidic GSLs, probably an increase in polysialoganglioside, while one that expressed the myc gene showed only a slight change. Neither transfectant grew in soft agar. However, another transfectant, which expressed both the myc and ras genes, and grew in soft agar, showed a more dramatic increase in the acidic GSL component. Thus, activations of the myc and ras oncogenes have a synergistic effect on GSL synthesis during transformation.
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