Abstract
The complete nucleotide sequence of the FBJ-MuSV proviral DNA and the cellular homolog (c-fos) of its oncogene (v-fos) have been determined. The 4026 nucleotide long FBJ-MuSV proviral DNA contains two long terminal repeats, a substitution of 1639 nucleotides of mouse cellular DNA (v-fos) and the 3' end of the env gene derived from FBJ-MuLV. The sequences of the parental FBJ-MuLV and the cellular c-fos (mouse) gene share five of five nucleotides at the 5' end and ten of 11 nucleotides at the 3' end of the v-fos substitution. When compared with the v-fos sequences, the c-fos gene contains four discontinuous regions, three of which are flanked by sequences characteristic of introns. Direct sequence analysis of c-fos (mouse) RNA by primer extension demonstrates that the fourth discontinuity is due to a 104 bp deletion in the v-fos gene. As a consequence of the deletion, the predicted v-fos and c-fos gene products differ at their C termini.
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