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Sequence variation of human papillomavirus type 16 E7 in preinvasive and invasive cervical neoplasias


Variation in the nucleotide sequence of the HPV 16 E7 gene in preinvasive cervical intra-epitherial neoplasia (CIN) and invasive cervical carcinoma specimens was analyzed. Direct DNA sequencing of PCR-amplified products with primers different from those used for PCR with 5′-end labeling generated distinct sequence ladders with a low background, even in specimens containing relatively low copy numbers of HPV. Of 14 cervical neoplasias, 11 cases showed sequence diversity from prototype HPV16, and a total of 22 nucleotide exchanges were detected. Nine of these led to single amino acid exchanges: [Thr5] to [Lys5] in one case and [Asn29] to [Ser29] in eight cases. The [Ser29] E7 was distributed uniformly among invasive carcinomas and precancerous legions, and was also found in a normal cervix. The [Lys5] E7 and [Ser29] E7 had transforming potential similar to the prototype E7 assessed by cooperation with the activatedras gene in rat embryo fibroblasts.

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Correspondence to Kei Fujinaga.

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Fujinaga, Y., Okazawa, K., Nishikawa, A. et al. Sequence variation of human papillomavirus type 16 E7 in preinvasive and invasive cervical neoplasias. Virus Genes 9, 85–92 (1994). https://doi.org/10.1007/BF01703438

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Key words

  • human papillomavirus type 16 (HPV 16)
  • E7 gene
  • polymerase chain reaction
  • PCR
  • cervical neoplasia