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. 1980 Jun;77(6):3504–3508. doi: 10.1073/pnas.77.6.3504

Biological activity of cloned Moloney sarcoma virus DNA: Terminally redundant sequences may enhance transformation efficiency.

D G Blair, W L McClements, M K Oskarsson, P J Fischinger, G F Vande Woude
PMCID: PMC349645  PMID: 6251463

Abstract

We have measured the ability of cloned restriction fragments containing the whole and partial genomes of two strains of Moloney murine sarcoma virus to induce cell transformation in DNA transfection assays. The cloned intact ml and HTl murine sarcoma virus proviruses transform with an efficiency of approximately 40,000-50,000 focus-forming units/pmol of proviral DNA, and the majority of these transformed cells contain a rescuable viral genome. A cloned 2.1-kilobase-pair internal fragment of the murine sarcoma virus containing 1.2 kilobase pairs of sarcoma virus-specific sequences (src) and approximately 900 base pairs of leukemia virus-derived sequences adjacent to the 5' end of src transforms with approximately 1/10,000th the efficiency of the intact genome. When leukemia virus-deprived sequences containing a single copy of the 600-base-pair direct terminal repeated sequences are present at either the 5' or 3' end of this src-containing fragment, the transforming activity is stimulated 1000-fold. Cotransfection with a mixture of cloned fragments, one containing the internal 2.1-kilobase-pair src fragment and the other containing a single copy of the terminally redundant sequence, results in a 300-fold increase in transformation efficiency.

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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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