Epigenetic Modification and Host Gene Silencing Profile Induced by High-Risk HPV Strains in Cervical Cancer
Persistent infection with high-risk human papillomavirus (HR-HPV) is the primary driver of cervical cancer; however, viral presence alone is insufficient to induce malignancy. The progression from initial infection to invasive carcinoma requires a coordinated series of alterations in both the viral genome and the host cell's regulatory machinery. This review focuses on three principal mechanisms by which HR-HPV bypasses host regulatory controls: epigenetic modifications, immune evasion, and endocrine signaling. Specifically, we describe how the viral oncoproteins E6 and E7 recruit host DNA methyltransferases—particularly DNMT1, DNMT3A, and DNMT3B—to silence tumor suppressor genes such as CCNA, hTERT, and E-cadherin via promoter hypermethylation. Beyond DNA methylation, HPV disrupts histone acetylation and methylation patterns through interactions with p300/CBP, the NuRD complex, and Polycomb group proteins, while simultaneously dysregulating non-coding RNAs and specific microRNAs to reinforce this transcriptionally silenced state. The review further details how HPV escapes immune clearance by driving a Th1-to-Th2 cytokine shift, downregulating MHC class I expression, and recruiting myeloid-derived suppressor cells and regulatory T cells to the cervical microenvironment. Additionally, we discuss the role of cofactors, focusing on the synergistic interaction between estradiol and HPV oncogenes; this interaction promotes local immunosuppression via estrogen receptor alpha signaling on stromal fibroblasts and infiltrating immune cells. We also examine the contribution of high parity as a key epidemiological risk factor. A comparative analysis of patient data across three distinct studies is presented to illustrate how demographic and reproductive variables correlate with cervical lesion severity in different populations. Ultimately, cervical carcinogenesis stems from multi-pathway interactions where viral oncogenes, epigenetic changes, immune escape, and hormonal factor