Filogenia e filogeografia do Feline coronavirus (FCoV) em gatos domésticos (Felis catus) naturalmente infectados

• Ano de defesa: 2011
• Autor(a) principal: Myrrha, Luciana Wanderley
• Orientador(a): Lamêgo, Márcia Rogéria de Almeida
• Banca de defesa: Resende, Maurício , Heinemann, Marcos Bryan
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Medicina Veterinária
• Departamento: Biotecnologia, diagnóstico e controle de doenças; Epidemiologia e controle de qualidade de prod. de
• País: BR
• Palavras-chave em Português: Coronavirus; Bioquímica; Biologia molecular
• Palavras-chave em Inglês: Coronavirus; Biochemistry; Molecular biology
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::BIOQUIMICA::BIOLOGIA MOLECULAR
• Link de acesso: http://locus.ufv.br/handle/123456789/5074

The Feline coronavirus (FCoV) is an enveloped virus RNA single-stranded, which belongs to the family Coronaviridae and the order Nidovirales. This virus is an important pathogen of wild and domestic cats and can cause a mild or inapparent enteric infection and also a rare and fatal disease called feline infectious peritonitis (FIP). The precise cause of FIP is still unknown but some hypotheses are suggested. The most accepted hypothesis is the theory of internal mutation that suggests a less virulent biotype of FCoV (FECV), would lead to other more pathogenic biotype (FIPV), capable of infecting monocytes and macrophages leading to FIP. However, despite being the most mentioned, there are still uncertainties in the relationship of the FCoV genome with the disease phenotype. This work presents a review from different FCoV studies attempt to elucidate existing theories on the pathogenesis of FCoV infection and tested through phylogenetic and phylogeographic approaches, the 7b gene of the first Brazilians FCoV sequences of asymptomatic and symptomatic cats in order to study the correlation between genetic diversity of this gene and differentiation of the two biotypes (FECV and FIPV). The 7b gene was shown to be highly conserved among the isolates and there was no differentiation between FIPV and FECV biotypes in phylogeographical and phylogenetic analysis, calling into question the theory of mutation.