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. 1974 Sep;71(9):3418–3422. doi: 10.1073/pnas.71.9.3418

Detection and Localization of Virus-Specific DNA by In Situ Hybridization of Cells During Infection and Rapid Transformation by the Murine Sarcoma-Leukemia Virus

Maria Carla Loni 1,*, Maurice Green 1
PMCID: PMC433784  PMID: 4139710

Abstract

Cytological preparations of interphase nuclei and chromosomes from mouse 3T6 cells prepared at various times after infection with the murine sarcomaleukemia virus complex were hybridized with the [3H]DNA product of the viral RNA-directed DNA polymerase. While uninfected nuclei had an average of 4 autoradiographic grains, infected nuclei had 30 grains at 5 hr after infection and 63-65 grains at 11 and 25 hr. Virus-specific grains were localized in the chromocenters of interphase nuclei and were found also in the centromeric heterochromatin region of metaphase chromosomes. These findings provide evidence that the viral RNA-directed DNA polymerase functions to synthesize virus-specific DNA early after infection and that newly synthesized viral DNA rapidly becomes associated with or integrated into specific intranuclear sites.

Keywords: RNA-directed DNA polymerase, transformed cell

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