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Hepatitis C virus (HCV) is a global public health problem, with approximately 3% of the world population now infected. The clinical course of HCV often involves chronic infection, which can lead to liver dysfunction and hepatocellular carcinoma. Because HCV cannot be efficiently propagated in cell culture, researchers have relied heavily on animal models to study the physical characteristics of HCV and the course of events associated with HCV infection. The chimpanzee is the only nonhuman primate actually proven to be susceptible to HCV infection and has commonly been used to study viral hepatitis induced by HCV. Molecular cloning of the HCV genome has now allowed HCV transmission studies in chimpanzees to progress from the early work of characterizing infectious serum to a current focus of characterizing infectious HCV molecular clones. Moreover, the cloned HCV genome has paved the way for the development of alternative animal models for HCV, most notably transgenic mouse models for the study of HCV pathogenesis. The authors review these animal model applications of the HCV molecular clones, including construction and transmission of mutant viral genomes. The expression of specific viral protein products in these animal models will provide important insight into the structure-function relation that specific HCV genome sequences impart on virus replication and pathogenesis.

Molecular Clones of Hepatitis C Virus: Applications to Animal Models