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We have isolated four clones of integrated human papillomavirus type 16 (HPV-16) DNA from four different primary cervical cancer specimens. All clones were found to be monomeric or dimeric forms of HPV-16 DNA with cellular flanking sequences at both ends. Analysis of the viral sequences in these clones showed that E6/E7 open reading frames and the long control region were conserved and that no region specific for the integration was detected. Analysis of the cellular flanking sequences revealed no significant homology with any known human DNA sequences, except Alu sequences, and no homology among the clones, indicating no cellular sequence specific for the integration. By probing with single-copy cellular flanking sequences from the clones, it was demonstrated that the integrated HPV-16 DNAs, with different sizes in the same specimens, shared the same cellular flanking sequences at the ends. Furthermore, it was shown that the viral sequences together with cellular flanking sequences were amplified. The possible process of viral integration into cell chromosomes in cervical cancer is discussed.

journal of virology

Analysis of integrated human papillomavirus type 16 DNA in cervical cancers: amplification of viral sequences together with cellular flanking sequences