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We investigated the transforming activity of human papillomavirus type 8 (HPV8) by expressing all early open reading frames from a heterologous promoter in different rodent fibroblast lines. Morphological transformation was observed only in G418-selected mouse C127 and Rat 1 cells containing an intact E6-coding region. E6 of HPV8 did not transform NIH 3T3 cells as did E6 of bovine papillomavirus type 1. C127 cells transformed by E6 were anchorage independent and had a reduced serum requirement but did not form tumors in nude mice. E7 of HPV8 showed no transforming potential, in contrast to E7 of HPV18 and HPV16. It was, however, able to complement an E7 mutant of bovine papillomavirus type 1 with a defect in high-copy-number DNA maintenance. The data indicate that the expression of the HPV8 E6 open reading frame is sufficient to induce morphological transformation in rodent fibroblasts, whereas E7 is involved in the replication of the viral DNA.

Involvement of human papillomavirus type 8 genes E6 and E7 in transformation and replication