Phylogeny and polymorphism in the long control regions E6, E7, and L1 of HPV Type 56 in women from southwest China

Jing,Yaling; Wang,Tao; Chen,Zuyi; Ding,Xianping; Xu,Jianju; Mu,Xuemei; Cao,Man; Chen,Honghan

doi:10.3892/mmr.2018.8743

Phylogeny and polymorphism in the long control regions E6, E7, and L1 of HPV Type 56 in women from southwest China

Authors:
- Yaling Jing
- Tao Wang
- Zuyi Chen
- Xianping Ding
- Jianju Xu
- Xuemei Mu
- Man Cao
- Honghan Chen
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Affiliations: Key Laboratory of Bio‑Resources and Eco‑Environment, Ministry of Education, Institute of Medical Genetics, College of Life Science, Sichuan University, Chengdu, Sichuan 610064, P.R. China
Published online on: March 14, 2018 https://doi.org/10.3892/mmr.2018.8743
Pages: 7131-7141
Copyright: © Jing et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 4.0].

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Abstract

Globally, human papillomavirus (HPV)‑56 accounts for a small proportion of all high‑risk HPV types; however, HPV‑56 is detected at a higher rate in Asia, particularly in southwest China. The present study analyzed polymorphisms, intratypic variants, and genetic variability in the long control regions (LCR), E6, E7, and L1 of HPV‑56 (n=75). The LCRs, E6, E7 and L1 were sequenced using a polymerase chain reaction and the sequences were submitted to GenBank. Maximum‑likelihood trees were constructed using Kimura's two‑parameter model, followed by secondary structure analysis and protein damaging prediction. Additionally, in order to assess the effect of variations in the LCR on putative binding sites for cellular proteins, MATCH server was used. Finally, the selection pressures of the E6‑E7 and L1 genes were estimated. A total of 18 point substitutions, a 42‑bp deletion and a 19‑bp deletion of LCR were identified. Some of those mutations are embedded in the putative binding sites for transcription factors. 18 single nucleotide changes occurred in the E6‑E7 sequence, 11/18 were non‑synonymous substitutions and 7/18 were synonymous mutations. A total 24 single nucleotide changes were identified in the L1 sequence, 6/24 being non‑synonymous mutations and 18/24 synonymous mutations. Selective pressure analysis predicted that the majority of mutations of HPV‑56 E6, E7 and L1 were of positive selection. The phylogenetic tree demonstrated that the isolates distributed in two lineages. Data on the prevalence and genetic variation of HPV‑56 types in southwest China may aid future studies on viral molecular mechanisms and contribute to future investigations of diagnostic probes and therapeutic vaccines.

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