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Hepatitis C virus (HCV) has no animal reservoir, infecting only humans. To investigate species barrier determinants limiting infection of rodents, murine liver complementary DNA library screening was performed, identifying transmembrane proteins Cd302 and Cr1l as potent restrictors of HCV propagation. Combined ectopic expression in human hepatoma cells impeded HCV uptake and cooperatively mediated transcriptional dysregulation of a noncanonical program of immunity genes. Murine hepatocyte expression of both factors was constitutive and not interferon inducible, while differences in liver expression and the ability to restrict HCV were observed between the murine orthologs and their human counterparts. Genetic ablation of endogenous Cd302 expression in human HCV entry factor transgenic mice increased hepatocyte permissiveness for an adapted HCV strain and dysregulated expression of metabolic process and host defense genes. These findings highlight human-mouse differences in liver-intrinsic antiviral immunity and facilitate the development of next-generation murine models for preclinical testing of HCV vaccine candidates.
Hepatitis C virus (HCV) enters hepatocytes via various entry factors, including scavenger receptor BI (SR-B1), cluster of differentiation 81 (CD81), epidermal growth factor receptor (EGFR), claudin-1 (CLDN1), and occludin (OCLN). As CLDN1 and OCLN are not readily accessible due to their tight junctional localization, HCV likely accesses them by either disrupting cellular polarity or migrating to the tight junction. In this study, we image HCV entry into a three-dimensional polarized hepatoma system and reveal that the virus sequentially engages these entry factors through actin-dependent mechanisms. HCV initially localizes with the early entry factors SR-B1, CD81, and EGFR at the basolateral membrane and then accumulates at the tight junction in an actin-dependent manner. HCV associates with CLDN1 and then OCLN at the tight junction and is internalized via clathrin-mediated endocytosis by an active process requiring EGFR. Thus, HCV uses a dynamic and multi-step process to engage and enter host cells.
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