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Symp Fundam Cancer Res. 1986;39:99-113.

Proto-oncogene fos: an inducible multifaceted gene.

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Salk Institute, San Diego, California 92138.


Proto-oncogene fos, which is expressed during cell growth and cell differentiation and development, is a multifaceted gene. The viral homolog, v-fos, was identified as the resident transforming gene of FBJ-murine osteosarcoma virus, which induces bone tumors in mice. Owing to an in-frame deletion during the biogenesis of the v-fos gene, the products of viral and cellular fos proteins differ at their C-termini. Despite different C-termini, both fos proteins are nuclear in their location and can transform fibroblasts in vitro. However, transformation by the c-fos gene requires removal of a 67-base pair sequence from the 3' noncoding domain. Proto-oncogene fos is a highly inducible gene in response to a variety of growth factors and differentiation-specific inducers. The expression of the fos gene is not modulated during the cell cycle.

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