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Nucleic Acids Research, 1979, Vol. 7, No. 3 651-668
© 1979

Articles

Comparative study of papovavirus DNA: BKV(MM), BKV(WT) and SV40

Robert C.A. Yang and Ray Wu

Section of Biochemistry, Molecular and Cell Biology, Cornell University Ithaca, NY, 14853, USA

Received July 11, 1979. Extensive physical mapping revealed that approximately 90% of the genomes of BKV(prototype, WT) and BKV (MM strain) are identical or closely related. Nucleotide sequences of the non-homologous regions and a large portion of the homologous regions have been determined for both genomes. The coding sequence of small t antigen of BKV(MM) is 216 nucleotides shorter than that of BKV(WT), even though no differences in biological function of the t antigen was observed. Both genomes contain three similar sets of 44–61 base-pair repeated sequences. However, the DNA sequence of the tandem repeats is totally different between BKV (human cell as host) and SV40 (monkey cell as host). On the other hand, the region between the N-terminus of the T antigen genes and the origin of replication is dominated by a similar set of palindromic sequences in BKV and SV40 DNA. There is also extensive homology between the regions which code for proteins in BKV and SV40, suggesting a close evolutionary relationship.


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