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. 1977 Nov;24(2):498–504. doi: 10.1128/jvi.24.2.498-504.1977

Measurement of proviral genes in uninfected and avian myeloblastosis virus-infected cells by hybridization with 3H-labeled complementary DNA probe excess.

L J Heilmann, T M Herman, G S Beaudreau
PMCID: PMC515959  PMID: 199736

Abstract

Viral RNA (vRNA) from avian myeloblastosis virus or DNA from virus-infected and uninfected cells was hybridized with [3H]DNA complementary to viral RNA ([3H]cDNA) under conditions of [3H]cDNA excess. When [3H]cDNA was used to drive the hybridization reaction with vRNA, a rate constant of 33.2 liters/mol-s was obtained. The same rate constant was obtained when vRNA excess was used as the driver. The specific activities of the [3H]DNA probe, estimated from kinetic measurements of the hybridization reaction and from the amount of [3H]cDNA in hybrid form at equilibrium, were 9.1 and 8.6 cpm/pg, respectively. DNA isolated from uninfected cells contained five or six copies of proviral DNA per cell genome. DNA isolated from erythrocytes infected with avian myeloblastosis virus had an additional five or six viral genes added to the cell genome, and the virus-infected target cell (myeloblasts) contained about 15 additional copies of proviral DNA per cell. The use of excess [3H]cDNA probe is an easy and accurate method to quantify the frequency of proviral DNA sequences in cell DNA and to measure a small amount (40 to 200 pg) of vRNA. Probe excess hybridization offers a number of advantages over other procedures and these are discussed.

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Selected References

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

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