title: Comparisons of RNAi approaches for validation of human RNA helicase A as an essential factor in hepatitis C virus replication.
abstract: A major issue of current virology concerns the characterization of cellular proteins that operate as functional components of the viral multiplication process. RNAi is a powerful tool to elucidate gene functions. In this study three RNAi approaches (transient transfection, stable transduction and inducible RNAi) were assessed to validate human RNA helicase A (RHA) as an essential factor in hepatitis C virus (HCV) replication. It indicated that RHA transient knockdown by synthetic siRNA had no effect on HCV replication, while RHA stable knockdown via lentivector transduction caused cell lethality. The involvement of RHA in HCV replication was verified by an RNAi inducible system that, on the one hand, maintained long-term gene silencing, but on the other hand, alleviated siRNA toxicity during the essential gene silencing. A 21-day follow-up of the response of HCV replication to the presence and absence of RNAi indicated that RHA is a cellular factor involved in the HCV replication process.
authors.affiliation: iTherX Pharmaceutical Inc., San Diego, CA 92121, USA.
authors.forename: Qiuchen S
authors.initials: QS
authors.lastname: He
authors.forename: Hengli
authors.initials: H
authors.lastname: Tang
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Ky
authors.initials: K
authors.lastname: Truong
authors.forename: Flossie
authors.initials: F
authors.lastname: Wong-Staal
authors.forename: Demin
authors.initials: D
authors.lastname: Zhou
mesh_terms: D002460:Cell Line; D002470:Cell Survival; D053487:DEAD-box RNA Helicases / Q000235:genetics / Q000378:metabolism*; D055785:Gene Knockdown Techniques; D020868:Gene Silencing; D016174:Hepacivirus / Q000502:physiology*; D006801:Humans; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D014779:Virus Replication
chemical_list: D009363:Neoplasm Proteins; D034741:RNA, Small Interfering; C098487:DHX9 protein, human; D053487:DEAD-box RNA Helicases