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. 1984 Oct;4(10):2239–2242. doi: 10.1128/mcb.4.10.2239

Short direct repeats mediate spontaneous high-frequency deletions in DNA of minute virus of mice.

A Hogan, E A Faust
PMCID: PMC369046  PMID: 6095052

Abstract

Previous work (E. A. Faust and D. C. Ward, J. Virol. 32:276-292, 1979) revealed a remarkably high rate of spontaneous deletion in viral DNA during lytic infection of cultured murine cells with minute virus of mice (MVM), an autonomous parvovirus. In the present study, we have isolated plasmid and phage recombinants containing MVM DNA inserts bearing deletions and we have determined the DNA sequence spanning three deletion junctions. The deletions, which average 3 kilobases in length, occur between pairs of perfectly homologous 4- to 10-base-pair direct repeats, such that one copy of the repeated sequence is lost, whereas the other remains behind at the deletion junction. When compared, the three sets of direct repeats exhibit no apparent sequence homology and have an A + T content of between 50 and 80%. These results indicate that 4- to 10-base-pair homologies mediate spontaneous deletion formation in the MVM genome and highlight parvoviruses as novel model systems for studies of this ubiquitous pathway of genetic variation.

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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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