Abstract
The hepatitis C virus (HCV) genome is highly heterogeneous. Its genetic variability (genotypes and subtypes) is related to its biological and clinical properties. In 2005, a consensus was reached regarding a unified nomenclature system for HCV genotypes and subtypes. Since then, many complete genome sequences have been reported, resulting in the identification of new genotypes and subtypes. To determine the current status of HCV genotypes, complete genome sequences and their annotations were retrieved from public databases. These viral sequences were arranged according to genotype/subtype and geographical distribution and analyzed phylogenetically to determine the relationships between classification and geography. In addition, the relationships between the HCV genome and the genomes of various related viruses were analyzed phylogenetically to determine the HCV origin. These analyses showed that the viruses evolved along with their hosts and that, worldwide, HCV should be classified into seven major genotypes with their serial subtypes.
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Shin-I, T., Sugiyama, M., Mizokami, M. (2016). Hepatitis C Virus Genotypes and Their Evolution. In: Miyamura, T., Lemon, S., Walker, C., Wakita, T. (eds) Hepatitis C Virus I. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56098-2_2
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DOI: https://doi.org/10.1007/978-4-431-56098-2_2
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