Recombinant BALB and Harvey sarcoma viruses with normal proto-ras-coding regions transform embryo cells in culture and cause tumors in mice (original) (raw)

Abstract

The ras genes of BALB and Harvey sarcoma viruses contain point mutations in codon 12 or codons 12 and 59, relative to proto-ras from normal animal and human cells. By in vitro recombination between cloned rat proto-ras and cloned BALB and Harvey sarcoma proviruses, we constructed recombinant proviruses with normal proto-ras-coding regions. These recombinant proviruses transformed mouse 3T3 cells upon transfection. However, when the transforming efficiencies of proviral DNAs were compared after transfection with helper provirus, recombinant proviruses were 2 to 30 times less efficient than the corresponding wild-type proviruses. Recombinant sarcoma viruses isolated from cells transformed by cloned proviral DNA contained the expected normal ras-coding region. They transformed rat embryo cells and induced erythroblastosis and sarcomas in newborn mice as efficiently as wild-type viruses did. We conclude that conversion of normal proto-ras genes to viral ras genes depends on truncation of normal proto-ras regulatory elements and substitution by retroviral (long terminal repeat) promoters and that the transforming function of long terminal repeat-ras genes is enhanced by point mutations.

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Selected References

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