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. 1985 Jun;5(6):1247–1259. doi: 10.1128/mcb.5.6.1247

Recombination between poly[d(GT).d(CA)] sequences in simian virus 40-infected cultured cells.

J R Stringer
PMCID: PMC366852  PMID: 2993859

Abstract

CVI cells were transfected with oversized simian virus 40 (SV40) genomes that could be reduced to packageable size by alternative homologous recombination pathways involving either two polydeoxyguanylic-thymidylic acid X polydeoxycytidylic-adenylic acid (poly[d(GT).d(CA)]; abbreviated hereafter as poly(GT)] tracts or two tracts of homologous SV40 sequence. Plaque-forming viruses rescued by this procedure were found to contain genomes formed by homologous and nonhomologous recombination events. Half of the viable viral DNA molecules recovered were the result of recombination between two tracts of poly(GT). Approximately 20% of the rescued viral genomes were produced by homologous recombination between tracts of SV40 DNA. Nonhomologous recombination involving SV40 sequences was also a major pathway of deletion, producing ca. 30% of the viral plaques. Tracts of poly(GT) generated by recombination were variable in length, suggesting that recombination between poly(GT) tracts was usually unequal. On a per-nucleotide basis, poly(GT) recombination occurred eight times more frequently than did recombination between homologous SV40 DNA. This eightfold difference is the maximum recombinatory enhancement attributable to poly(GT) sequences. Although DNA sequence analysis showed that tracts of poly(GT) generated by recombination retained the alternating G-T repeat motif throughout their length, the contribution of the nonhomologous pathway to poly(GT) recombination cannot be ruled out, and the relative proclivity of a given length of d(GT).d(CA) sequence to undergo homologous recombination is probably less than eight times greater than that of an SV40 sequence of the same length.

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