Sequence Variation Analysis of HPV-18 Isolates in Southwest China

• Published in: PloS one Vol. 8; no. 2; p. e56614
• Main Authors: Shen, Mengjie, Ding, Xianping, Li, Tianjun, Chen, Gangyi, Zhou, Xiao
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 25.02.2013; Public Library of Science (PLoS)
• Subjects: Adenoviruses; Amino acids; Analysis; Biology; Carcinogenesis; Carcinogens; Cervical cancer; Cervix; China; Deoxyribonucleic acid; Development and progression; Diagnostic systems; DNA; DNA probes; DNA, Viral - genetics; Female; Gene expression; Gene sequencing; Genetic research; Genetics; Genomes; Genomics; Health aspects; Human papillomavirus; Human papillomavirus 18 - genetics; Humans; In Vitro Techniques; Infections; Laboratories; Lesions; Life sciences; Medicine; Mutation; Papillomavirus infections; Polymerase Chain Reaction; Proteins; Sequence Analysis, DNA - methods; Transversion; Tumorigenesis; Uterine Cervical Neoplasms - microbiology; Vaccines; Variation; Virology; China
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0056614

Intratypic variations of HPV-18 are known to differ in the persistence of the infection, frequency of carcinogenesis and the progression of precursor lesions to advanced cervical cancer. This study was designed to analyze sequence variations of HPV-18 isolates in order to discover novel HPV-18 variants and to evaluate the variations among infected women in southwest China. Cervical biopsies from 56 HPV-18-positive women with cervical neoplasia were assayed by PCR amplification and sequencing of all eight genes (E1, E2, E4, E5, E6, E7, L1, L2) of the HPV-18 genome. The most frequently observed variation was a C to G transversion at nucleotide 287 of E6, which was found in 48.2% of samples. Analysis of E7 revealed only one specimen as having sequence variations. In addition, we have identified several novel variations: A551C in E6, G6906A in L1, and C4915T and C5147A in L2. The mutations in E6 and L2 are silent, while the E7 mutation results in a single amino acid change. This study complements and expands on previous descriptions of HPV-18 variants. The sequence variation data presented here provides a foundation for future research on HPV-induced oncogenesis and may prove valuable for developing diagnostic probes and in the design of HPV vaccines for targeted populations.