Avian hepatitis E virus identified in Russian chicken flocks exhibits high genetic divergence based on the ORF2 capsid gene

Avian Pathol. 2012 Oct;41(5):459-63. doi: 10.1080/03079457.2012.711464. Epub 2012 Sep 11.

Abstract

A total of 79 liver samples from clinically sick and asymptomatic chickens were tested for avian hepatitis E virus (aHEV). Samples were received from 19 farms, five of which tested positive with primers targeting the ORF2 capsid gene. The phylogenetic analysis of a 242-base-pair fragment demonstrated that the Russian aHEV isolates share between 78.2 and 96.2% over the fragment sequenced, whereas the nucleotide sequence identities between the Russian isolates and the other representatives from GeneBank varied from 76.3 to 96.2%. The homology between the studied hepatitis E viruses and swine hepatitis E virus varied between 46.9 to 48.1%. The most divergent isolate aHEV16050 showed homology of 82.6% as compared with the strains in the dendrogram. The three positive hepatitis E virus samples (aHEV16279, aHEV16050 and aHEV18196) did not cluster with the European genotype 3 as expected due to the close location of Russia to Europe, nor did they with the other two genotypes, separating to a distinct branch. The aHEV16211 grouped together with European and Chinese isolates, and the aHEV18198 with Canadian ones.

MeSH terms

  • Animals
  • Base Sequence
  • Chickens*
  • DNA Primers / genetics
  • Genetic Drift
  • Genetic Variation
  • Genotype
  • Hepatitis, Viral, Animal / virology*
  • Hepevirus / genetics*
  • Hepevirus / isolation & purification
  • Liver / virology
  • Molecular Sequence Data
  • Phylogeny
  • Poultry Diseases / virology*
  • RNA Virus Infections / veterinary*
  • RNA Virus Infections / virology
  • RNA, Viral / genetics
  • Reverse Transcriptase Polymerase Chain Reaction / veterinary
  • Russia
  • Sequence Analysis, DNA / veterinary
  • Viral Proteins / genetics

Substances

  • DNA Primers
  • ORF2 protein, Hepatitis E virus
  • RNA, Viral
  • Viral Proteins

Associated data

  • GENBANK/JQ814688
  • GENBANK/JQ814689
  • GENBANK/JQ814690
  • GENBANK/JQ814691
  • GENBANK/JQ814692