HPV 16 E7 alters translesion synthesis signaling

Area of Science:

• Oncology
• Virology
• Molecular Biology

Background:

• High-risk human papillomaviruses (HPVs), particularly HPV16, are the primary cause of cervical cancer.
• Oncogenes HPV E6 and E7 are crucial for viral transformation and HPV16 lifecycle.
• HPV16 E7 destabilizes RB, leading to replication stress and increased E2F1-responsive gene expression.

Purpose of the Study:

• To investigate cellular adaptations to replication stress induced by oncogenic HPVs.
• To determine the role of the translesion synthesis (TLS) pathway in cervical cancer.
• To assess the correlation between TLS gene expression and patient survival.

Main Methods:

• Comparative analysis of TLS gene expression across various cancer types.
• Assessment of TLS factor induction in HPV16 E7 expressing cells under replication stress.
• Correlation analysis between TLS gene expression and survival data in cervical cancer patients.

Main Results:

• Translesion synthesis (TLS) gene expression is significantly elevated in cervical cancers compared to 15 other cancer types.
• Cells expressing HPV16 E7 show impaired induction of the TLS factor POLη upon replication stress.
• Increased expression of at least one TLS gene is associated with improved survival in women with cervical cancer.

Conclusions:

• The translesion synthesis (TLS) pathway is a critical adaptation for cervical cancer cells to tolerate replication stress induced by oncogenic HPVs.
• Elevated TLS gene expression is a hallmark of cervical cancer and a potential prognostic biomarker.
• Targeting the TLS pathway could offer novel therapeutic strategies for cervical cancer.