Proc Natl Acad Sci U S A. 1991 Nov 1;88(21):9770-4.

Polydnavirus DNA is integrated in the DNA of its parasitoid wasp host.

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Department of Entomology, Texas A&M University, College Station 77843.

Abstract

The polydnavirus Campoletis sonorensis virus (CsV) is present in the oviducts of all adult C. sonorensis female wasps and appears to be required for these wasps to parasitize hosts successfully. Physical mapping, Southern blot analysis, and nucleotide sequence analysis demonstrate that the viral DNA B-specific sequences in cloned wasp DNA are colinear with viral genomic segment DNA B from nucleocapsids and are covalently linked to nonviral wasp sequences. Integrated DNA B terminates in 59-nucleotide imperfect direct repeats, but a single repeat exists in the extrachromosomal superhelical viral DNA B. Sequences near each junction form imperfect inverted repeats with sequences near the ends of an internal viral 540-base-pair repeat element gene. CsV appears to be the first documented integrated, nonretroviral DNA virus of insects and probably is vertically transmitted as a provirus.

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Polydnavirus DNA is integrated in the DNA of its parasitoid wasp host.

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