Abstract
The 70S RNA component of several avian tumor viruses was hybridized with DNA extracted from avian tumor virus-infected and uninfected chicken and Japanese quail cells. Tritium-labeled 70S RNAs from Rous sarcoma virus (RSV), Rous associated virus-1 (RAV-1), RAV-60, and Schmidt-Ruppin-RSV (SR-RSV) hybridize from 3 to 10 times more with DNA from uninfected chicken cells than with DNA from Escherichia coli, calfthymus, or baby hamster kidney cells. After infection of chicken cells with RSV(RAV-1), SR-RSV, or RAV-2, the amount of 70S avian tumor virus [3H]RNA hybridized increases by 1.6 times. The specificity of the hybridization reaction was shown by the specific competition of 70S SR-RSV [3H]RNA with 70S RNA from RSV(RAV-1), and not with RNA from Sendai virus or chicken cells. There was no difference in the hybridization of 70S RNA from RSV (RAV-1), RAV-1, or RAV-60 with DNA either from chicken cells that contain RAV-60 in a nonreplicating form or from chicken cells that do not appear to contain RAV-60. These results indicate that both types of uninfected chicken cells contain DNA that is complementary to RNA from several avian tumor viruses and that the amount of complementary DNA increases in such cells after infection with an avian tumor virus. The RNAs of genetically different avian tumor viruses appear to have indistinguishable base sequences by this technique.
Keywords: Rous sarcoma virus, Rous associated virus, RNA-DNA hybrids
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