Hepatitis C virus infection protein network

Area of Science:

• Virology
• Molecular Biology
• Systems Biology

Background:

• Hepatitis C virus (HCV) infection involves complex interactions between viral and host cellular proteins.
• A comprehensive understanding of these interactions is crucial for elucidating viral pathogenesis and identifying therapeutic targets.

Purpose of the Study:

• To perform a proteome-wide mapping of protein-protein interactions between HCV and human proteins.
• To identify cellular pathways and host factors targeted by HCV during infection.
• To construct a protein network associated with clinical disorders in chronically infected patients.

Main Methods:

• Yeast two-hybrid screening to identify novel HCV-human protein interactions.
• Literature mining to gather existing interaction data.
• Integration of interaction data into a reconstructed human interactome for network analysis.
• Functional annotation and pathway enrichment analysis.

Main Results:

• Identified 314 novel protein-protein interactions between HCV and human proteins, with 170 from literature mining.
• HCV-interacting cellular proteins are highly central and interconnected within the human interactome.
• HCV targets enriched cellular pathways, including insulin, Jak/STAT, and TGF-beta signaling.
• Focal adhesion was identified as a newly affected cellular function, primarily by HCV NS3 and NS5A proteins.
• HCV CORE protein emerged as a significant perturbator of the constructed protein network.

Conclusions:

• This study provides a comprehensive map of HCV-host protein interactions, revealing critical cellular pathways and host factors involved in infection.
• The findings highlight the central role of specific host proteins and pathways in HCV pathogenesis.
• The identification of focal adhesion as a targeted pathway and the role of CORE, NS3, and NS5A proteins offer new insights for therapeutic strategies against chronic HCV.