Genetic detection and characterization of HE and S genes of recent betacoronaviruses in rabbits from Egypt
Revue Med. Vet. • 2017
Publication Information
Authors
E.M. EL-NAHAS, H.S. EL-SAYED, G.F. EL-BAGOURY, S.S.A. SHARAWI, A.S. EL-HABBAA1, S.S. EL-BASUNI
Keywords
Egyptian RCoV; New Zealand rabbits; RT–PCR; HE and S gene analysis
Journal
Revue Med. Vet.
Publisher
Not Available
Volume
168
Issue
7-9
Pages
164-172
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
The current study is the first reported molecular characterization of rabbit coronavirus strains in Egypt. The cecal contents taken from young New Zealand rabbits (5-6 weeks old) with enteritis were tested for the presence of coronaviruses using RT–PCR with primers specific for the polymerase gene. The three positive samples showed the presence of the hemagglutinin-esterase (HE) gene indicative of Betacoronavirus subgroup A. Betacoronavirus strains designated as rabbit coronavirus (RCoV) Egypt/Qal/1, RCoV Egypt/Qal/2 and RCoV Egypt/Qal/3 were partially sequenced for their HE and spike (S) genes. In all RCoV Egypt/Qal strains, the nucleotide homology was 98.3-100% and 99.8-100% for HE and S genes respectively while the deduced amino acid homology was 98.7-100% and 99.5-100% for HE and S proteins respectively with characteristic cleavage site QGRSRR motif in their S proteins. High similarity was observed with RCoV HKU14 strains and bovine coronavirus strains (BCoV) than other Betacoronaviruses. Phylogenetic data of nucleotide and amino acid sequences of the HE and S genes revealed that all RCoV Egypt/Qal strains were more homologous to each other and were distinct from the other known Betacoronavirus published on GenBank. The findings suggest the existence of a novel variant of RCoV genetically related to RCoV HKU14 strains
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