With a single exception, all isolates of hepatitis C virus (HCV) require adaptive mutations to replicate efficiently in cell culture. Here, we show that a major class of adaptive mutations regulates the activity of a cellular lipid kinase, phosphatidylinositol 4-kinase IIIα (PI4KA). HCV needs to stimulate PI4KA to create a permissive phosphatidylinositol 4-phosphate-enriched membrane microenvironment in the liver and in primary human hepatocytes (PHHs). In contrast, in Huh7 hepatoma cells, the virus must acquire loss-of-function mutations that prevent PI4KA overactivation. This adaptive mechanism is necessitated by increased PI4KA levels in Huh7 cells compared with PHHs, and is conserved across HCV genotypes. PI4KA-specific inhibitors promote replication of unadapted viral isolates and allow efficient replication of patient-derived virus in cell culture. In summary, this study has uncovered a long-sought mechanism of HCV cell-culture adaptation and demonstrates how a virus can adapt to changes in a cellular environment associated with tumorigenesis.

Tuning a cellular lipid kinase activity adapts hepatitis C virus to replication in cell culture / C. Harak, M. Meyrath, I. Romero-Brey, C. Schenk, C. Gondeau, P. Schult, K. Esser-Nobis, M. Saeed, P. Neddermann, P. Schnitzler, D. Gotthardt, S. Perez-Del-Pulgar, C. Neumann-Haefelin, R. Thimme, P. Meuleman, F.W.R. Vondran, R.D. Francesco, C.M. Rice, R. Bartenschlager, V. Lohmann. - In: NATURE MICROBIOLOGY. - ISSN 2058-5276. - 2:3(2016), pp. 16247.1-16247.13.

Tuning a cellular lipid kinase activity adapts hepatitis C virus to replication in cell culture

R.D. Francesco;
2016

Abstract

With a single exception, all isolates of hepatitis C virus (HCV) require adaptive mutations to replicate efficiently in cell culture. Here, we show that a major class of adaptive mutations regulates the activity of a cellular lipid kinase, phosphatidylinositol 4-kinase IIIα (PI4KA). HCV needs to stimulate PI4KA to create a permissive phosphatidylinositol 4-phosphate-enriched membrane microenvironment in the liver and in primary human hepatocytes (PHHs). In contrast, in Huh7 hepatoma cells, the virus must acquire loss-of-function mutations that prevent PI4KA overactivation. This adaptive mechanism is necessitated by increased PI4KA levels in Huh7 cells compared with PHHs, and is conserved across HCV genotypes. PI4KA-specific inhibitors promote replication of unadapted viral isolates and allow efficient replication of patient-derived virus in cell culture. In summary, this study has uncovered a long-sought mechanism of HCV cell-culture adaptation and demonstrates how a virus can adapt to changes in a cellular environment associated with tumorigenesis.
RNA replication; III-alpha; phosphatidylinositol 4-phosphate; NS5A hyperphosphorylation; efficient replication; human hepatocytes; genotype 3A; in-vitro; protein; infection
Settore BIO/19 - Microbiologia Generale
2016
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/634721
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