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  • Title: Genetic variability of HPV-58 E6 and E7 genes in Southwest China.
    Author: Yang L, Yang H, Chen J, Huang X, Pan Y, Li D, Ding X, Wu K, Shi X, Fu J, Shi H, Ma S, Sun Q.
    Journal: Infect Genet Evol; 2014 Jan; 21():395-400. PubMed ID: 24368255.
    Abstract:
    HPV accounts for most of incidence of cervical cancer. Genetic variations of E6 and E7 may be associated with the development of cervical cancer in specific geographic regions. HPV-58 has been found to be a relatively prevalent high-risk HPV among southwest Chinese women. To explore gene intratypic variations and polymorphisms of HPV-58 E6 and E7 genes originating in Southwest China, a total of 2000 scraped cell samples were collected for DNA extraction and HPV typing. Then, the E6 and E7 genes of HPV-58 (n=22) were sequenced and compared to others submitted to GenBank, followed by an analysis of the diversity of secondary structure by DNASTAR software. Phylogenetic trees were then constructed by Neighbor-Joining and the Kimura 2-parameters methods, followed by an analysis of selection pressures acting on the E6/E7 genes by PAML software. 22 were HPV-58 positive among 215 high-risk types' samples. The nucleotide variation rate of E6 was 86.36% (19/22) among the 22 HPV-58 E6 sequences studied. 4 single nucleotide changes were identified among the E6 sequences with 3/4 synonymous mutations (C187T, A260C, C307T) and 1/4 non-synonymous mutations (A388C, from Lys to Asn, in alpha helix). The most common mutations of E6 genes are the C307T and A388C. 8 single nucleotide changes were identified among the HPV-58 E7 sequences with 2/8 synonymous mutations (T726C, T744G) and 6/8 non-synonymous mutations (G599A, C632T, G694A, G760A, G761A, T803C). The nucleotide variation rate of E7 was 72.73% (17/22). The most common mutations of E7 genes are C632T, G694A, T744G, G760A (from Gly to Ser, in turn), G761A and T803C. The phylogenetic analyses demonstrate that all HPV-58 E6/E7 variants identified belonged to the Southeast Asia lineage. There was no evidence of positive selection in the sequence alignment of HPV-58 E6 and E7 genes.
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