title: Molecular detection of novel picornaviruses in chickens and turkeys.
abstract: Fecal specimens, including swabs and litter extracts, collected from chickens, domestic ducks, turkeys, and Canadian geese were tested using degenerate primers targeting regions encoding for conserved amino acid motifs (YGDD and DY(T/S)(R/K/G)WDST) in calicivirus RNA-dependent RNA polymerases. Similar motifs are also present in other RNA viruses. Two fecal specimens and 18 litter extracts collected from chickens and turkeys yielded RT-PCR products. BLAST search and phylogenetic analysis revealed that all amplicons represented picornaviruses that clustered into two major groups. Four chicken and one turkey samples yielded 250 bp amplicons with 84-91% nucleotide identity to the recently described turkey hepatitis viruses, while 280 and 283 bp amplicons obtained from 11 chicken and 4 turkey samples represented novel picornaviruses with the closest nucleotide identity to kobuviruses (54-61%) and turdiviruses (47-54%). Analysis of 2.2-3.2 kb extended genome sequences including the partial P2 (2C) and complete P3 (3A, 3B (VPg), 3C(pro), and 3D(pol)) regions of selected strains indicated that viruses yielding the 280/283 bp amplicons represent a putative new genus of Picornaviridae. The 3'-non-translated region (NTR) of the turkey hepatitis-like viruses described in this study was significantly longer (641-654 nt) than that of any of the other piconaviruses and included a putative short open reading frame (ORF). In summary, we report the molecular detection of novel picornaviruses that appear to be endemic in both chickens and turkeys.
authors.affiliation: Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, ML7017, 3333 Burnet Avenue, Cincinnati, OH 45229, USA. tibor.farkas@cchmc.org
authors.forename: Tibor
authors.initials: T
authors.lastname: Farkas
authors.forename: Brittney
authors.initials: B
authors.lastname: Fey
authors.forename: Edwin
authors.initials: E
authors.lastname: Hargitt
authors.forename: Mark
authors.initials: M
authors.lastname: Parcells
authors.forename: Brian
authors.initials: B
authors.lastname: Ladman
authors.forename: Maria
authors.initials: M
authors.lastname: Murgia
authors.forename: Yehia
authors.initials: Y
authors.lastname: Saif
mesh_terms: D000818:Animals; D002645:Chickens; D016000:Cluster Analysis; D019353:Endemic Diseases / Q000662:veterinary; D005243:Feces / Q000821:virology; D014644:Genetic Variation; D017720:Molecular Epidemiology; D008969:Molecular Sequence Data; D010802:Phylogeny; D010849:Picornaviridae / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D010850:Picornaviridae Infections / Q000662:veterinary* / Q000821:virology; D011201:Poultry Diseases / Q000821:virology*; D012367:RNA, Viral / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D014422:Turkeys
chemical_list: D012367:RNA, Viral