Variability and pathogenicity of hepatitis E virus genotype 3 variants

Donald B. Smith, Samreen Ijaz, Richard S. Tedder, Boris Hogema, Hans L. Zaaijer, Jacques Izopet, Amanda Bradley-Stewart, Rory Gunson, Heli Harvala, Inka Kokki, Peter Simmonds

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Infection with hepatitis E virus (HEV) can be clinically inapparent or produce symptoms and signs of hepatitis of varying severity and occasional fatality. This variability in clinical outcomes may reflect differences in host susceptibility or the presence of virally encoded determinants of pathogenicity. Analysis of complete genome sequences supports the division of HEV genotype 3 (HEV-3) variants into three major clades: 3ra comprising HEV isolates from rabbits, and 3efg and 3abchij comprising the corresponding named subtypes derived from humans and pigs. Using this framework, we investigated associations between viral genetic variability of HEV-3 in symptomatic and asymptomatic infections by comparing HEV-3 subgenomic sequences previously obtained from blood donors with those from patients presenting with hepatitis in the UK (54 blood donors, 148 hepatitis patients), the Netherlands (38 blood donors, 119 hepatitis patients), France (24 blood donors, 55 hepatitis patients) and Germany (14 blood donors, 36 hepatitis patients). In none of these countries was evidence found for a significant association between virus variants and patient group (P>0.05 Fisher's exact test). Furthermore, within a group of 123 patients in Scotland with clinically apparent HEV infections, we found no evidence for an association between variants of HEV-3 and disease severity or alanine aminotransferase level. The lack of detectable virally encoded determinants of disease outcomes in HEV-3 infection implies a more important role for host factors in its clinical phenotype.

Original languageEnglish
Pages (from-to)3255-3264
Number of pages10
JournalJournal of General Virology
Volume96
Issue number11
DOIs
Publication statusPublished - Nov 2015

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