Alphavirus RNA replicon systems

US5792462A · kind A · utility

Assignees

• The University of North Carolina at Chapel Hill · US
• The United States of America as represented by the Secretary of the Army · US

Inventors

• Robert E. Johnston · Chapel Hill, US
• Nancy L. Davis · Chapel Hill, US
• Jonathan F. Smith · Cary, US
• Peter Pushko · Frederick, US
• Michael Parker · Frederick, US
• George Ludwig · Frederick, US

Key dates

• Filing date: May 23, 1995
• Grant date: Aug 11, 1998
• Expiry date: May 23, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C12N2840/20
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention provides a helper cell for expressing an infectious, replication defective, alphavirus particle in an alphavirus-permissive cell. The helper cell includes (a) a first helper RNA encoding (i) at least one alphavirus structural protein, and (ii) not encoding at least one alphavirus structural protein; and (b) a second helper RNA separate from the first helper RNA, the second helper RNA (i) not encoding the alphavirus structural protein encoded by the first helper RNA, and (ii) encoding the at least alphavirus one structural protein not encoded by the first helper RNA, such that all of the alphavirus structural proteins assemble together into alphavirus particles in the cell. Preferably, the helper cell also includes a replicon RNA encoding an alphavirus packaging sequence and an inserted heterogeneous RNA.