Identification of a G2-like porcine rotavirus bearing a novel VP4 type, P[32]

Patrick J. Collins , Vito Martella , Canio Buonavoglia , Helen O'Shea

A porcine group A rotavirus (GARV) strain, 61/07/Ire, was isolated from a 4-5 week asymptomatic piglet, during an epidemiological survey of porcine herds in Southern Ireland, in 2007. The nucleotide (nt) and amino acid (aa) sequence of the full-length VP4 protein of the PoRV strain 61/07/Ire was determined. Based on the entire VP4 open reading frame (nt), strain 61/07/Ire displayed ≤ 76.5% identity to representatives of the established 31 P-types, a value far lower than the percentage identity cutoff value (80%) established by the Rotavirus Classification Working Group (RCWG) to define a novel P genotype. Strain 61/07/Ire revealed low aa identity, ranging from 57.1% to 83.6%, to the cognate sequences of representatives of the various P genotypes. The aa identity was lower in the VP8* trypsin-cleavage fragment of the VP4, which encompasses the VP4 hypervariable region, ranging from 36.9% to 75.3%. Sequence analyses of the VP7, VP6, and NSP4 genes revealed that the GARV strain 61/07/Ire possessed a G2-like VP7, an E9 NSP4 genotype and an I5 VP6 genotype. Altogether, these results indicate that the GARV strain 61/07/Ire should be considered as a prototype of a new VP4 genotype, P[32], and provide further evidence for the vast heterogeneity of group A rotaviruses.

Mots clés: Rotavirus; pig; VP4; P genotype

Domaines: Biologie moléculaire; Génétique animale; Biologie cellulaire; Interactions cellulaires [q-bio.CB]; Microbiologie et Parasitologie; Immunologie; Neurosciences [q-bio.NC]; Santé publique et épidémiologie; Biologie animale

Patrick J. Collins, Vito Martella, Canio Buonavoglia, Helen O'Shea. Identification of a G2-like porcine rotavirus bearing a novel VP4 type, P[32]. Veterinary Research, 2010, 41 (5), ⟨10.1051/vetres/2010045⟩. ⟨hal-00903201⟩