Medical Virology, Institute of Medical Virology, University Hospital of Tuebingen, Tuebingen, Germany.
Department of Molecular Biology, Max Planck Institute for Developmental Biology, Tuebingen, Germany.
Cancer Med. 2020 Feb;9(3):1058-1068. doi: 10.1002/cam4.2771. Epub 2019 Dec 19.
Several studies have demonstrated that the viral genome can be methylated by the host cell during progression from persistent infection to cervical cancer. The aim of this study was to investigate whether methylation at a specific site could predict the development of viral persistence and whether viral load shows a correlation with specific methylation patterns. HPV16-positive samples from women aged 20-29 years (n = 99) with a follow-up time of 13 years, were included from a Danish cohort comprising 11 088 women. Viral load was measured by real-time PCR and methylation status was determined for 39 CpG sites in the upstream regulatory region (URR), E6/E7, and L1 region of HPV16 by next-generation sequencing. Participants were divided into two groups according to whether they were persistently (≥ 24 months) or transiently HPV16 infected. The general methylation status was significantly different between women with a persistent and women with a transient infection outcome (P = .025). One site located in L1 (nt. 5962) was statistically significantly (P = .00048) different in the methylation status after correction using the Holm-Sidak method (alpha = 0.05). Correlation analyses of samples from HPV16 persistently infected women suggest that methylation is higher although viral load is lower. This study indicates that methylation at position 5962 of the HPV16 genome within the L1 gene might be a predictive marker for the development of a persistent HPV16 infection.
已有多项研究表明,在持续性感染向宫颈癌进展过程中,宿主细胞可使病毒基因组发生甲基化。本研究旨在探究特定部位的甲基化是否可预测病毒持续性感染的发生,以及病毒载量是否与特定的甲基化模式存在相关性。我们选取了丹麦一个包含 11088 名女性的队列中年龄在 20-29 岁(n=99)、随访时间为 13 年、HPV16 阳性的女性作为研究对象,通过实时 PCR 检测病毒载量,通过下一代测序技术检测 HPV16 上游调控区(URR)、E6/E7 和 L1 区 39 个 CpG 位点的甲基化状态。我们根据女性 HPV16 是否持续性(≥24 个月)或一过性感染,将参与者分为两组。HPV16 持续性感染和一过性感染女性的整体甲基化状态存在显著差异(P=0.025)。经 Holm-Sidak 法校正(alpha=0.05)后,位于 L1 区(nt.5962)的一个位点的甲基化状态存在统计学差异(P=0.00048)。HPV16 持续性感染女性样本的相关性分析表明,尽管病毒载量较低,但甲基化水平较高。本研究表明,HPV16 基因组 L1 区 5962 位的甲基化可能是持续性 HPV16 感染发展的预测标志物。