Epigenetics of human papillomaviruses

Area of Science:

• Virology
• Oncology
• Epigenetics

Background:

• Human papillomaviruses (HPVs) are common pathogens infecting epithelial cells, causing benign warts and high-risk HPVs linked to cancers.
• The HPV life cycle is linked to host epithelial differentiation, and high-risk HPVs are associated with cervical, anogenital, and head/neck cancers.
• In cancer, the HPV genome integrates into the host genome, expressing oncogenes E6 and E7, driving tumor development.

Purpose of the Study:

• To summarize existing knowledge on HPV genome methylation changes during the viral life cycle and cancer progression.
• To present the first analysis of epigenetic modifications and transcription factor occupancy on the high-risk HPV18 genome using ChIP-seq data.
• To investigate HPV18 genome regulation in HeLa cells, a cervical cancer cell line.

Main Methods:

• Review of existing literature on HPV genome methylation.
• Analysis of publicly available ChIP-seq data for epigenetic marks and transcription factors.
• Focus on high-risk HPV16 and HPV18, particularly in the context of cervical cancer (HeLa cells).

Main Results:

• Studies show HPV genome methylation status varies with the viral life cycle and neoplastic progression.
• The analysis provides insights into histone modifications and transcription factor binding on the HPV18 genome.
• This data offers a deeper understanding of HPV gene regulation in cervical cancer cells.

Conclusions:

• HPV genome methylation is a dynamic process influenced by the viral life cycle and disease progression.
• Epigenetic modifications and transcription factor binding play crucial roles in regulating high-risk HPV oncogene expression.
• Understanding these mechanisms in HPV-associated cancers can inform future therapeutic strategies.