Relationship of avian retrovirus DNA synthesis to integration in vitro.
An in vitro integration system derived from avian leukosis virus-infected cells supports both intra- and intermolecular integration of the viral DNA. In the absence of polyethylene glycol, intramolecular integration of viral DNA molecules into themselves (autointegration) was preferred. In the presence of polyethylene glycol, integration into an exogenously supplied DNA target was greatly promoted. Analysis of integration intermediates revealed that the strand transfer mechanisms of both reactions were identical to those of retroviruses and some transposons: each 3' end of the donor molecule is joined to a 5' end of the cleaved target DNA. The immediate integration precursor appears to be linear viral DNA with the 3' ends shortened by 2 nucleotides. Finally, in the avian system, most cytoplasmic viral DNA appears to be incomplete and further DNA synthesis is required for integration in vitro.
Lee
Y M
YM
Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111.
Coffin
J M
JM
D001354:Avian Leukosis Virus / Q000235:genetics*; D001483:Base Sequence; D015139:Blotting, Southern; D002472:Cell Transformation, Viral / Q000187:drug effects; D004279:DNA, Viral / Q000096:biosynthesis*; D015224:Dideoxynucleosides / Q000494:pharmacology; D066298:In Vitro Techniques; D008969:Molecular Sequence Data; D011092:Polyethylene Glycols; D015347:RNA Probes; D011995:Recombination, Genetic / Q000187:drug effects; D015183:Restriction Mapping; D014779:Virus Replication
D004279:DNA, Viral; D015224:Dideoxynucleosides; D015347:RNA Probes; D011092:Polyethylene Glycols