Effect of helper virus on the number of murine sarcoma virus DNA copies in infected mammalian cells

A. E. Frankel, J. H. Gilbert, P. J. Fischinger

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Cell lines of four mammalian species were each examined for the number of Moloney murine sarcoma virus (M-MSV) DNA copies in total cellular DNA after M-MSV transformation. Sarcoma-positive, leukemia-negative (S+L-) M-MSV transformed cells were compared to M-MSV-transformed cells infected with a replicating leukemia virus. Both unfractionated M-MSV complementary DNA and complementary DNA representing the MSV-specific and the MSV-murine leukemia virus-common regions of the M-MSV genome were hybridized to total cellular DNA of various species. DNAs of mouse, cat, dog, and human S+L- cells contained from less than one to a few proviral M-MSV DNA copies per haploid genome. In contrast, helper-virus-coinfected, M-MSV-producing cells of each species showed a 3- to 10-fold increase in M-MSV proviral DNA over that found in corresponding S+L- cells. MSV-specific and MSV-murine leukemia virus-common nucleotide sequences were each increased to a similar degree. A corresponding examination of cellular DNA of leukemia virus-infected normal or S+L- mammalian cells was performed to establish the resulting number of leukemia proviral DNA copies. The infection of normal or S+L- mammalian cells with several leukemia-type viruses that did not have nucleotide sequences closely related to the cell before infection resulted in the appearance of one to three corresponding leukemia proviral DNA copies.

Original languageEnglish (US)
Pages (from-to)492-502
Number of pages11
JournalJournal of virology
Issue number3
StatePublished - 1977

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology


Dive into the research topics of 'Effect of helper virus on the number of murine sarcoma virus DNA copies in infected mammalian cells'. Together they form a unique fingerprint.

Cite this