intra-host sequence variability in human papillomavirus

intra-host sequence variability in human papillomavirus

;Racheal S. Dube Mandishora;Kristina S. Gjøtterud;Sonja Lagström;Babill Stray-Pedersen;Kerina Duri;Nyasha Chin'ombe;Mari Nygård;Irene Kraus Christiansen;Ole Herman Ambur;Mike Z. Chirenje;Trine B. Rounge
geomicrobiology: molecular and environmental perspective 2018 Vol. 5 pp. 180-191
113
mandishora2018papillomavirusintra-host

Abstract

Human papillomaviruses (HPVs) co-evolve slowly with the human host and each HPV genotype displays epithelial tropisms. We assessed the evolution of intra HPV genotype variants within samples, and their association to anogenital site, cervical cytology and HIV status. Variability in the L1 gene of 35 HPV genotypes was characterized phylogenetically using maximum likelihood, and portrayed by phenotype. Up to a thousand unique variants were identified within individual samples. In-depth analyses of the most prevalent genotypes, HPV16, HPV18 and HPV52, revealed that the high diversity was dominated by a few abundant variants. This suggests high intra-host mutation rates. Clades of HPV16, HPV18 and HPV52 were associated to anatomical site and HIV co-infection. Particularly, we observed that one HPV16 clade was specific to vaginal cells and one HPV52 clade was specific to anal cells. One major HPV52 clade, present in several samples, was strongly associated with cervical neoplasia. Overall, our data suggest that tissue tropism and HIV immunosuppression are strong shapers of HPV evolution. Keywords: HPV variability, HPV phylogenetics, Anogenital, Tissue tropism, HIV

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