Structure of simian virus 40 recombinants that contain both host and viral DNA sequences. II. The structure of variant 1103 and its comparison to variant CVPS/1P2 (EcoRI res).

In an effort to characterize sites of recombination between SV40 and monkey DNA, we have determined the primary sequence of a large portion of the SV40 variant, designated 1103. This virus contains DNA sequences derived both from the wild type SV40 genome and from the permissive monkey cell in which the virus was propagated. Further, the monkey sequences included in the defective genome are homologous to both highly repeated monkey DNA (alpha component) and sequences that are infrequently repeated in the monkey genome. The regions of the 1103 genome where DNA sequences were determined include 1) the segments of the variant that surround joints connecting SV40 and monkey sequences, 2) the segment that contains the joint between monkey sequences of high and low reiteration frequency, and 3) the DNA segment of the variant that is homologous to monkey alpha component DNA. Comparison of the data obtained from the sequences analysis of the SV40 variants 1103 and CVP8/1/P2 (EcoRI res) (described in Wakamiya, T., McCutchan, T., Rosenberg, M., and Singer, M. (1979) J. Biol. Chem 254, 3584-3591) reveals certain similarities between the two that may be involved in eukaryotic recombination and defective variant formation.