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Cloning and sequencing of the structural region and expression of putative core gene of hepatitis C virus from a British case of chronic sporadic hepatitis

Department of Medicine, Queen Elizabeth the Queen Mother Wing, St Mary's Hospital Medical School, Norfolk Place, London W2 1NY, U.K.

We report the cloning and sequencing of the putative structural region of the hepatitis C virus (HCV) genome (2229 nucleotides) from an isolate derived from a British case of chronic sporadic non-A, non-B hepatitis. The overall sequence shows a higher similarity with one type of HCV, HCV1 (92%), than with HCV2 (80%), is very highly conserved at the 5' end (99%) preceding the long open reading frame, is well conserved also in the putative core region (90 to 97%), but shows marked variation in the putative envelope region, particularly in the envelope 2/non-structural 1 region (70%). The putative core gene was cloned in pJ3 under the early simian virus 40 promoter and expressed in human hepatoma cells. A predominantly cytoplasmic 22K polypeptide was expressed which was antigenically reactive with serum from chronically infected HCV patients.

Received 13 November 1991; accepted 11 February 1992.