Skip to main content
NCBI home page
Journal of Virology logoLink to Journal of Virology
. 1980 Jun;34(3):615–626. doi: 10.1128/jvi.34.3.615-626.1980

Relationship between integrated and nonintegrated viral DNA in rat cells transformed by polyoma virus.

S Gattoni, V Colantuoni, C Basilico
PMCID: PMC288749  PMID: 6247500

Abstract

Fischer rat fibroblasts transformed by polyoma virus contain, in addition to viral sequences integrated into the host genome, nonintegrated viral DNA molecules, whose presence is under the control of the viral A gene. To understand the mechanism of production of the "free" viral DNA, we have characterized the DNA species produced by several rat lines transformed by wild-type virus or by ts-a polyoma virus and compared them with the integrated viral sequences. Every cell line tested yielded a characteristic number of discrete species of viral DNA. The presence of defectives was a very common occurrence, and these molecules generally carried deletions mapping in the viral "late" region. The production of multiple species of free viral DNA was not due to heterogeneity of the transformed rat cell population, and its pattern did not change upon fusion with permissive mouse cells. Analysis of the integrated viral DNA sequences in the same cell lines showed, in most cases, a full head-to-tail tandem arrangement of normal-size and defective molecules. The free DNA produced by these lines faithfully reflected the integrated species. This was true also in the case of a cell line which contained a viral insertion corresponding to approximately 1.3 polyoma genomes, with each of the repeated portions of the viral DNA molecule carrying a different-size deletion. These results support the hypothesis that the free DNA derives from the integrated form through a mechanism of homologous recombination leading to excision and limited replication.

Full text

PDF
615

Images in this article

617Image
on p.617
618Image
on p.618
618Image
on p.618
619Image
on p.619
621Image
on p.621
622Image
on p.622
623Image
on p.623

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Basilico C., Gattoni S., Zouzias D., Valle G. D. Loss of integrated viral DNA sequences in polyomatransformed cells is associated with an active viral A function. Cell. 1979 Jul;17(3):645–659. doi: 10.1016/0092-8674(79)90272-1. [DOI] [PubMed] [Google Scholar]
  2. Basilico C., Zouzias D., Della-Valle G., Gattoni S., Colantuoni V., Fenton R., Dailey L. Integration and excision of polyoma virus genomes. Cold Spring Harb Symp Quant Biol. 1980;44(Pt 1):611–620. doi: 10.1101/sqb.1980.044.01.064. [DOI] [PubMed] [Google Scholar]
  3. Birg F., Dulbecco R., Fried M., Kamen R. State and organization of polyoma virus DNA sequences in transformed rat cell lines. J Virol. 1979 Feb;29(2):633–648. doi: 10.1128/jvi.29.2.633-648.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Botchan M., Topp W., Sambrook J. Studies on simian virus 40 excision from cellular chromosomes. Cold Spring Harb Symp Quant Biol. 1979;43(Pt 2):709–719. doi: 10.1101/sqb.1979.043.01.079. [DOI] [PubMed] [Google Scholar]
  5. FRIED M. CELL-TRANSFORMING ABILITY OF A TEMPERATURE-SENSITIVE MUTANT OF POLYOMA VIRUS. Proc Natl Acad Sci U S A. 1965 Mar;53:486–491. doi: 10.1073/pnas.53.3.486. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Fried M., Griffin B. E. Organization of the genomes of polyoma virus and SV40. Adv Cancer Res. 1977;24:67–113. doi: 10.1016/s0065-230x(08)61013-1. [DOI] [PubMed] [Google Scholar]
  7. Gross-Bellard M., Oudet P., Chambon P. Isolation of high-molecular-weight DNA from mammalian cells. Eur J Biochem. 1973 Jul 2;36(1):32–38. doi: 10.1111/j.1432-1033.1973.tb02881.x. [DOI] [PubMed] [Google Scholar]
  8. Hirt B. Selective extraction of polyoma DNA from infected mouse cell cultures. J Mol Biol. 1967 Jun 14;26(2):365–369. doi: 10.1016/0022-2836(67)90307-5. [DOI] [PubMed] [Google Scholar]
  9. Hutchinson M. A., Hunter T., Eckhart W. Characterization of T antigens in polyoma-infected and transformed cells. Cell. 1978 Sep;15(1):65–77. doi: 10.1016/0092-8674(78)90083-1. [DOI] [PubMed] [Google Scholar]
  10. Ito Y., Brocklehurst J. R., Dulbecco R. Virus-specific proteins in the plasma membrane of cells lytically infected or transformed by pol-oma virus. Proc Natl Acad Sci U S A. 1977 Oct;74(10):4666–4670. doi: 10.1073/pnas.74.10.4666. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Kelly R. B., Cozzarelli N. R., Deutscher M. P., Lehman I. R., Kornberg A. Enzymatic synthesis of deoxyribonucleic acid. XXXII. Replication of duplex deoxyribonucleic acid by polymerase at a single strand break. J Biol Chem. 1970 Jan 10;245(1):39–45. [PubMed] [Google Scholar]
  12. Ketner G., Kelly T. J., Jr Integrated simian virus 40 sequences in transformed cell DNA: analysis using restriction endonucleases. Proc Natl Acad Sci U S A. 1976 Apr;73(4):1102–1106. doi: 10.1073/pnas.73.4.1102. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Pontecorvo G. Production of mammalian somatic cell hybrids by means of polyethylene glycol treatment. Somatic Cell Genet. 1975 Oct;1(4):397–400. doi: 10.1007/BF01538671. [DOI] [PubMed] [Google Scholar]
  14. Prasad I., Zouzias D., Basilico C. State of the viral DNA in rat cells transformed by polyoma virus. I. Virus rescue and the presence of nonintergrated viral DNA molecules. J Virol. 1976 May;18(2):436–444. doi: 10.1128/jvi.18.2.436-444.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Rigby P. W., Dieckmann M., Rhodes C., Berg P. Labeling deoxyribonucleic acid to high specific activity in vitro by nick translation with DNA polymerase I. J Mol Biol. 1977 Jun 15;113(1):237–251. doi: 10.1016/0022-2836(77)90052-3. [DOI] [PubMed] [Google Scholar]
  16. Silver J., Schaffhausen B., Benjamin T. Tumor antigens induced by nontransforming mutants of polyoma virus. Cell. 1978 Oct;15(2):485–496. doi: 10.1016/0092-8674(78)90018-1. [DOI] [PubMed] [Google Scholar]
  17. Southern E. M. Detection of specific sequences among DNA fragments separated by gel electrophoresis. J Mol Biol. 1975 Nov 5;98(3):503–517. doi: 10.1016/s0022-2836(75)80083-0. [DOI] [PubMed] [Google Scholar]
  18. Zouzias D., Prasad I., Basilico C. State of the viral DNA in rat cells transformed by polyma virus. II. Identification of the cells containing nonintegrated viral DNA and the effect of viral mutations. J Virol. 1977 Oct;24(1):142–150. doi: 10.1128/jvi.24.1.142-150.1977. [DOI] [PMC free article] [PubMed] [Google Scholar]

Articles from Journal of Virology are provided here courtesy of American Society for Microbiology (ASM)

RESOURCES