RESUMO
Astroviruses are considered the cause of gastroenteritis in humans and animals. Studies in recent years show avian astroviruses are also associated with duckling hepatitis, gosling gout, and chicken nephritis. In this study, a GAstV strain, designated as JS2019/China, was detected in dead goslings from a commercial goose farm in Jiangsu province of China. Viral strain was proliferated in goose embryos and sequence analysis showed the isolated strain had a classical structure arrangement and a series of conserved regions compared with other GAstVs. Sequence comparison and phylogenetic analysis of whole genome and ORF2 revealed that JS2019/China belongs to the GAstV-1 group, which consists of most of the GAstV strains. Amino acid analysis indicated that some mutants might have an impact on viral protease capacity, such as V505I and K736E of ORF1a and T107I, F342S, and S606P of ORF2. Taken together, a novel GAstV strain was isolated and genomic analysis and protein polymorphism analysis indicated that some amino acid mutants might affect the viral virulence.
Assuntos
Infecções por Astroviridae , Avastrovirus , Doenças das Aves Domésticas , Humanos , Animais , Gansos/genética , Infecções por Astroviridae/veterinária , Filogenia , Genoma Viral , Avastrovirus/genética , ChinaRESUMO
Avastrovirus infection is associated with enteric disease, nephritis, and hepatitis in birds. In this study, we present a protocol for the complete sequencing of the ORF2 gene of avian nephritis virus (ANV), chicken astrovirus (CAstV), and turkey astrovirus type 1 (TAstV-1) using a conventional Sanger technique. Previously and newly designed primer pairs targeting both the conserved flanking and internal regions of the ORF2 gene of these three viruses were used. The information derived from the astroviral sequences obtained in this study is fundamental for characterizing this virus and providing data regarding several aspects of disease epidemiology and prevention.
As infecções por avastrovírus estão associados à doença entérica, nefrite e hepatite em aves. Aqui, nos presentamos um protocolo planejado para o sequenciamento completo do gene ORF2 em Avian Nephritis Vírus (ANV), Chicken Astrovirus (CAstV) e Turkey Astrovirus tipo 1 (TAstV-1), usando a técnica de sequenciamento convencional de Sanger. Foram usados primers previamente descritos e desenhados neste estudo, tendo como alvo as regiões conservadas flanqueadoras e internas dentro do gene ORF2 nos três vírus. O conhecimento destas sequencias é um elemento chave para caracterizar o vírus e prover de dados em diversos aspectos da epidemiologia e prevenção da doença.
Assuntos
Animais , Avastrovirus/genética , Aves/virologia , Genes Virais , Reação em Cadeia da Polimerase , Sequência de Bases/genética , Marcação in Situ com Primers/métodosRESUMO
Avastrovirus infection is associated with enteric disease, nephritis, and hepatitis in birds. In this study, we present a protocol for the complete sequencing of the ORF2 gene of avian nephritis virus (ANV), chicken astrovirus (CAstV), and turkey astrovirus type 1 (TAstV-1) using a conventional Sanger technique. Previously and newly designed primer pairs targeting both the conserved flanking and internal regions of the ORF2 gene of these three viruses were used. The information derived from the astroviral sequences obtained in this study is fundamental for characterizing this virus and providing data regarding several aspects of disease epidemiology and prevention.(AU)
As infecções por avastrovírus estão associados à doença entérica, nefrite e hepatite em aves. Aqui, nos presentamos um protocolo planejado para o sequenciamento completo do gene ORF2 em Avian Nephritis Vírus (ANV), Chicken Astrovirus (CAstV) e Turkey Astrovirus tipo 1 (TAstV-1), usando a técnica de sequenciamento convencional de Sanger. Foram usados primers previamente descritos e desenhados neste estudo, tendo como alvo as regiões conservadas flanqueadoras e internas dentro do gene ORF2 nos três vírus. O conhecimento destas sequencias é um elemento chave para caracterizar o vírus e prover de dados em diversos aspectos da epidemiologia e prevenção da doença.(AU)