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J Virol. 1973 December; 12(6): 1288-1292
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Detection of Viral DNA Sequences in Adenovirus-Transformed Cells by In Situ Hybridization

^a Saint Louis University School of Medicine, Institute for Molecular Virology, St. Louis, Missouri 63110

ABSTRACT

Cytological preparations of cells transformed by members of three groups of human adenoviruses, adenovirus 12, 7, and 2, were annealed with radioactive complementary RNA (cRNA) (4 x 10⁷ to 4.5 x 10⁷ dpm/µg) prepared by copying viral DNA with the Escherichia coli DNA-directed RNA polymerase. These in situ hybridizations detected adenovirus-specific DNA sequences in interphase nuclei when transformed cells were annealed with homologous viral cRNA, but not with heterologous viral cRNA. The highest autoradiographic grain counts were found over adenovirus 7-transformed cell nuclei, next over adenovirus 12-, and the lowest over adenovirus 2-transformed cell nuclei. This is the same order as found by reassociation kinetic measurements (K. Fujinaga and M. Green, unpublished data).

¹ Present address: Faculty of Medicine, 4 Avenue Chapelle aux Champs, 1200-Brussels, Belgium.