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. 1990 Nov;10(11):5626–5633. doi: 10.1128/mcb.10.11.5626

Revertants of v-fos-transformed rat fibroblasts: suppression of transformation is dominant.

R Wisdom 1, I M Verma 1
PMCID: PMC361322  PMID: 2172782

Abstract

Phenotypic revertants of Finkel-Biskis-Riley (FBR)-murine sarcoma virus-transformed rat fibroblasts were isolated on the basis of their adherence to plastic tissue culture dishes in the absence of divalent cations. Some revertants had sustained deletions or inactivating mutations of the v-fos gene. However, two revertants expressed a functional v-fos gene at levels equal to that in the transformed parental cells, and therefore phenotypic reversion was due to mutations in nonviral genes. These revertants were considered nontransformed according to four criteria: (i) they were flat and had a nontransformed morphology, (ii) they were contact inhibited when grown to confluence, (iii) they did not display anchorage-independent growth in soft agar, and (iv) they did not form tumors in nude mice. Somatic-cell hybrids between the revertants and the transformed parental cells were nontransformed, suggesting that the revertants had sustained an activating mutation of a gene capable of suppressing transformation. The expression of c-jun, junB, and junD was not altered in the revertants, and they could not be transformed by transfection with a c-jun expression vector. The revertants were resistant to transformation by an activated c-Ha-ras gene but were susceptible to transformation by simian virus 40. Our results demonstrate the existence of a class of revertants that harbor genes capable of suppressing transformation by v-fos and some other oncogenes. This contrasts with previously described revertants of transformation by v-fos that contain recessive mutations.

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