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 intraepitherial 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 activated ras gene in rat embryo fibroblasts.
Fujinaga
Y
Y
Department of Molecular Biology, Sapporo Medical University, School of Medicine, Japan.
Okazawa
K
K
Nishikawa
A
A
Yamakawa
Y
Y
Fukushima
M
M
Kato
I
I
Fujinaga
K
K
D000595:Amino Acid Sequence; D001483:Base Sequence; D002278:Carcinoma in Situ / Q000821:virology*; D003001:Cloning, Molecular; D003062:Codon / Q000235:genetics; D017931:DNA Primers / Q000235:genetics; D004279:DNA, Viral / Q000235:genetics; D005260:Female; D005814:Genes, Viral; D011905:Genes, ras; D014644:Genetic Variation; D006801:Humans; D008969:Molecular Sequence Data; D009856:Oncogene Proteins, Viral / Q000235:genetics; D027383:Papillomaviridae / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity; D050725:Papillomavirus E7 Proteins; D016133:Polymerase Chain Reaction; D014170:Transformation, Genetic; D002583:Uterine Cervical Neoplasms / Q000821:virology*
D003062:Codon; D017931:DNA Primers; D004279:DNA, Viral; D009856:Oncogene Proteins, Viral; D050725:Papillomavirus E7 Proteins; C059731:oncogene protein E7, Human papillomavirus type 16