Analysis of regulatory motifs within HPV transcripts

Area of Science:

• Molecular biology
• Virology
• Gene regulation

Background:

• Papillomavirus late gene expression is tightly linked to host epithelial cell differentiation.
• Capsid protein production occurs exclusively in differentiating cells.
• Negative regulatory elements (NREs) are crucial for preventing premature capsid protein synthesis in undifferentiated cells.

Purpose of the Study:

• To demonstrate methods for identifying and mapping cis-acting RNA regulatory elements, using the human papillomavirus (HPV)-16 NRE as a model.
• To illustrate the application of reporter gene assays for discovering novel promoters and regulatory sequences in HPV DNA.
• To describe in vitro RNA-protein binding techniques for characterizing interactions with NREs and other regulatory motifs on HPV mRNA.

Main Methods:

• Transient transfection of reporter gene constructs.
• Reporter gene assays for promoter and regulatory sequence identification.
• In vitro RNA-protein binding techniques: ultraviolet crosslinking, electrophoretic mobility shift assay, and affinity purification.

Main Results:

• Demonstrated the utility of reporter gene assays for mapping HPV regulatory elements.
• Detailed established techniques for identifying cellular proteins that bind NREs.
• Highlighted the importance of host-HPV mRNA interactions in regulating gene expression.

Conclusions:

• Cis-acting RNA elements, like the HPV-16 NRE, play a significant role in controlling viral gene expression.
• Reporter gene assays and RNA-protein binding techniques are powerful tools for dissecting HPV regulatory mechanisms.
• Understanding these interactions is vital for comprehending HPV pathogenesis and developing therapeutic strategies.