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. 1992 Apr 15;89(8):3190–3194. doi: 10.1073/pnas.89.8.3190

Interaction of immune sera with synthetic peptides corresponding to the structural protein region of hepatitis C virus.

W M Ching 1, C Wychowski 1, M J Beach 1, H Wang 1, C L Davies 1, M Carl 1, D W Bradley 1, H J Alter 1, S M Feinstone 1, J W Shih 1
PMCID: PMC48831  PMID: 1373489

Abstract

Comparison of the deduced amino acid sequence from the structural region of the Hutchinson strain of hepatitis C virus (HCV-H) with four other HCV isolates clearly divides the five isolates into two groups based on sequence homology. The first group includes HCV-H, HCV-1, and HC-J1, while the second includes HCV-J1 and HC-J4. Among the five isolates the first 190 residues (putative nucleocapsid) are highly conserved whereas residues 196-513 exhibit significant diversity and include a hypervariable region encompassing residues 386-404. A series of overlapping decapeptides were synthesized by solid-phase pin technology according to sequence from HCV-H (amino acids 1-513), HC-J4 (amino acids 181-513), and regions from the three other isolates which exhibited sequence variation. A modified ELISA was used to measure immunoreactivity of sera from clinical posttransfusion cases and experimentally infected chimpanzees. Comparison of pre- and postinfection samples revealed 16 clusters of immunoreactive peptides within the structural region, none of which was found in the hypervariable region. Only one cluster (amino acids 73-89) was recognized by all human and chimpanzee sera. Clear variation in the immune response was observed between individuals, although no obvious difference in reactivity between acute and chronic cases was observed. Within individual profiles, the reactivity to each peptide cluster and the total number of reactive clusters increased over time.

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