RESUMO
Infection caused by Aeromonas brings great harm to fish farming. Among the factors associated with bacterial pathogenesis, iron uptake can contribute to the survival and virulence of bacteria within hosts. The aim of this study was to check the presence of genes related to iron uptake in Aeromonas hydrophila deriving from aquatic organisms in the São Francisco Valley and associate the presence of these genes with the ability to grow in media containing different concentrations of iron. The DNAs of 41 isolates were extracted and used in PCRs to verify the presence of the Fur, AmoA and pvcAB genes related to iron uptake. The growth of the isolates belonging to different genetic profiles was verified in culture media containing different iron concentrations. Two isolates were positive for the presence of the Fur gene, seven for the AmoA gene and two for the pvcAB gene. The growth test showed that the low availability of iron did not interfere in the growth of the isolates, nor in the isolate that did not contain any of the genes evaluated in this study, suggesting that the iron uptake's mechanisms of the tested isolates may be related to other genes and proteins.
Infecções causadas por Aeromonas trazem grandes prejuízos à piscicultura. Entre os fatores associados à patogênese bacteriana, a captação de ferro pode contribuir para a sobrevivência e a virulência das bactérias dentro dos hospedeiros. O objetivo deste estudo foi verificar a presença de genes relacionados à captação de ferro em Aeromonas hydrophila provenientes de organismos aquáticos do Vale do São Francisco e associar a presença desses genes com a capacidade de as bactérias crescerem em meios contendo diferentes concentrações de ferro. Os DNAs de 41 isolados foram extraídos e utilizados em PCRs para verificar a presença dos genes Fur, AmoA e pvcAB relacionados à captação de ferro. O crescimento dos isolados pertencentes a diferentes perfis genéticos foi verificado em meios de cultura contendo diferentes concentrações de ferro. Dois isolados foram positivos para a presença do gene Fur, sete para a do gene AmoA e dois para a do gene pvcAB. O teste de crescimento mostrou que a baixa disponibilidade de ferro não interferiu no crescimento dos isolados nem no isolado que não continha nenhum dos genes avaliados neste estudo, sugerindo que os mecanismos de captação de ferro dos isolados testados podem estar relacionados a outros genes e proteínas.
Assuntos
Animais , Crescimento Bacteriano , Aeromonas hydrophila , Pesqueiros , Genes , FerroRESUMO
Objetivou-se descrever os achados clínicos, histopatológicos e moleculares associados à MDC em um cão da raça Pastor-Suiço. O cão possuía uma paraparesia progressiva em membros pélvicos e foi submetido a avaliações clínicas, pelas quais se obteve, entre outros diferenciais, o diagnóstico presuntivo de MDC. Com a evolução dos sinais, o tutor optou pela eutanásia. Os achados histopatológicos da medula espinhal foram compatíveis com uma degeneração segmentar axonal e mielínica. O diagnóstico molecular foi realizado por meio da extração do DNA obtido por swab oral. Uma PCR foi otimizada utilizando-se primers descritos em literatura para amplificar a região do gene SOD1. A amostra foi, então, submetida a sequenciamento unidirecional, que revelou que o animal em questão era homozigoto para o alelo A para a mutação c.118G>A no éxon 2 do gene SOD1. O diagnóstico clínico presuntivo da MDC no presente caso foi esclarecido por meio dos achados histopatológicos, associados aos achados clínicos, e da sua caracterização molecular. Ressalta-se a contribuição deste relato, que traz aspectos clínicos, histopatológicos e moleculares associados à MDC na raça Pastor-Suíço, para a qual, até o presente momento, na literatura consultada, não há relato dessa enfermidade.(AU)
The objective of this study was to describe the clinical, histopathological and molecular findings associated with MDC in a Swiss Shepherd dog. The dog had a progressive paraparesis in pelvic limbs and was submitted to clinical evaluations where, among other differentials, the presumptive diagnosis of MDC was obtained. With the progression of the nervous deficits tutor opted for euthanasia. The histopathological findings of the spinal cord were compatible with axonal and myelinic segmental degeneration. Molecular diagnosis was performed by extracting the DNA obtained by oral swab. PCR was optimized using primers described in the literature to amplify the SOD1 gene region. The sample was then subjected to one-way sequencing which revealed that the animal in question was homozygous for the A allele for the c.118G>A mutation in exon 2 of the SOD1 gene. The presumptive diagnosis of MDC in the present case was clarified by histopathological findings, as well as by its molecular characterization. The contribution of this report brings clinical, histopathological and molecular aspects associated with canine degenerative myelopathy in the Swiss Shepherd breed, that until this moment, in the literature consulted, there is no report of this disease in the breed mentioned.(AU)
Assuntos
Animais , Feminino , Cães , Doenças da Medula Espinal/patologia , Doenças da Medula Espinal/veterinária , Doenças Neurodegenerativas/veterinária , Superóxido Dismutase-1 , Esclerose Lateral Amiotrófica/veterinária , Reação em Cadeia da PolimeraseRESUMO
Objetivou-se descrever os achados clínicos, histopatológicos e moleculares associados à MDC em um cão da raça Pastor-Suiço. O cão possuía uma paraparesia progressiva em membros pélvicos e foi submetido a avaliações clínicas, pelas quais se obteve, entre outros diferenciais, o diagnóstico presuntivo de MDC. Com a evolução dos sinais, o tutor optou pela eutanásia. Os achados histopatológicos da medula espinhal foram compatíveis com uma degeneração segmentar axonal e mielínica. O diagnóstico molecular foi realizado por meio da extração do DNA obtido por swab oral. Uma PCR foi otimizada utilizando-se primers descritos em literatura para amplificar a região do gene SOD1. A amostra foi, então, submetida a sequenciamento unidirecional, que revelou que o animal em questão era homozigoto para o alelo A para a mutação c.118G>A no éxon 2 do gene SOD1. O diagnóstico clínico presuntivo da MDC no presente caso foi esclarecido por meio dos achados histopatológicos, associados aos achados clínicos, e da sua caracterização molecular. Ressalta-se a contribuição deste relato, que traz aspectos clínicos, histopatológicos e moleculares associados à MDC na raça Pastor-Suíço, para a qual, até o presente momento, na literatura consultada, não há relato dessa enfermidade.(AU)
The objective of this study was to describe the clinical, histopathological and molecular findings associated with MDC in a Swiss Shepherd dog. The dog had a progressive paraparesis in pelvic limbs and was submitted to clinical evaluations where, among other differentials, the presumptive diagnosis of MDC was obtained. With the progression of the nervous deficits tutor opted for euthanasia. The histopathological findings of the spinal cord were compatible with axonal and myelinic segmental degeneration. Molecular diagnosis was performed by extracting the DNA obtained by oral swab. PCR was optimized using primers described in the literature to amplify the SOD1 gene region. The sample was then subjected to one-way sequencing which revealed that the animal in question was homozygous for the A allele for the c.118G>A mutation in exon 2 of the SOD1 gene. The presumptive diagnosis of MDC in the present case was clarified by histopathological findings, as well as by its molecular characterization. The contribution of this report brings clinical, histopathological and molecular aspects associated with canine degenerative myelopathy in the Swiss Shepherd breed, that until this moment, in the literature consulted, there is no report of this disease in the breed mentioned.(AU)
Assuntos
Animais , Feminino , Cães , Doenças da Medula Espinal/patologia , Doenças da Medula Espinal/veterinária , Doenças Neurodegenerativas/veterinária , Superóxido Dismutase-1 , Esclerose Lateral Amiotrófica/veterinária , Reação em Cadeia da PolimeraseAssuntos
Animais , Bovinos , Polimorfismo Genético , Variação Genética , Simulação por Computador , Bovinos/genéticaRESUMO
Investigation of molecular marker effects on production traits is essential to define marker assisted selection strategies in beef cattle. We looked for a possible association of molecular markers and backfat thickness (BFT) and rib eye area (REA) in Canchim (5/8 Charolais + 3/8 Zebu) and MA (offspring of Charolais bulls and 1/2 Canchim + 1/2 Zebu cows) animals raised exclusively on pasture. Traits were measured on 987 individuals from seven herds from two Brazilian States (São Paulo and Goiás), in March and April from 2005 to 2007, when animals were, on average, 19 months of age. Five microsatellite markers lying in QTL regions for BFT and REA (BMS490 and ETH10 on chromosome 5, INRA133 and ILSTS090 on chromosome 6, and BMS2142 on chromosome 19) were genotyped and association analyses were performed under an animal model using the restricted maximum likelihood method. After correction for multiple tests, a significant effect of microsatellite BMS490 on REA was observed, suggesting that at least one QTL affecting carcass traits in this region of the BTA5. No significant effect on BFT was observed for these markers.
Assuntos
Bovinos/genética , Animais , Mapeamento Cromossômico , Feminino , Marcadores Genéticos , Masculino , Repetições de Microssatélites/genética , Locos de Características QuantitativasRESUMO
Flagella are constructed and maintained through the highly conserved process of intraflagellar transport (IFT), which is a rapid movement of particles along the axonemal microtubules of cilia/flagella. Particles that are transported by IFT are composed of several protein subunits comprising two complexes (A and B), which are conserved among green algae, nematodes, and vertebrates. To determine whether or not homologues to members of the IFT complex proteins are conserved in Leishmania spp, we scanned genomes, transcriptomes and proteomes of Leishmania species in a search for putative IFT factors, which were then identified in silico, compared, cataloged, and characterized. Since a large proportion of newly identified genes in L. major remain unclassified, with many of these being potentially Leishmania- (or kinetoplastid-) specific, there is a need for detailed analyses of homologs/orthologs that could help us understand the functional assignment of these gene products. We used a combination of integrated bioinformatics tools in a pathogenomics approach to contribute to the annotation of Leishmania genomes, particularly regarding flagellar genes and their roles in pathogenesis. This resulted in the formal in silico identification of eight of these homologs in Leishmania (IFT subunits, 20, 27, 46, 52, 57, 88, 140, and 172), along with others (IFTs 71, 74/72, and 81), as well as sequence comparisons and structural predictions. IFT, an important flagellar pathway in Leishmania, begins to be revealed through screening of trypanosomatid genomes; this information could also be used to better understand fundamental processes in Leishmania, such as motility and pathogenesis.
Assuntos
Biologia Computacional/métodos , Flagelos/genética , Genes de Protozoários , Genoma de Protozoário , Leishmania/genética , Sequência de Aminoácidos , Animais , Transporte Biológico , Cílios/genética , Sequência Conservada , Dados de Sequência Molecular , Estrutura Terciária de Proteína , Subunidades Proteicas/química , Subunidades Proteicas/genética , Proteínas de Protozoários/química , Proteínas de Protozoários/genética , Análise de Sequência de DNA , Homologia de Sequência de AminoácidosRESUMO
Flagella are constructed and maintained through the highly conserved process of intraflagellar transport (IFT), which is a rapid movement of particles along the axonemal microtubules of cilia/flagella. Particles that are transported by IFT are composed of several protein subunits comprising two complexes (A and B), which are conserved among green algae, nematodes, and vertebrates. To determine whether or not homologues to members of the IFT complex proteins are conserved in Leishmania spp, we scanned genomes, transcriptomes and proteomes of Leishmania species in a search for putative IFT factors, which were then identified in silico, compared, cataloged, and characterized. Since a large proportion of newly identified genes in L. major remain unclassified, with many of these being potentially Leishmania- (or kinetoplastid-) specific, there is a need for detailed analyses of homologs/orthologs that could help us understand the functional assignment of these gene products. We used a combination of integrated bioinformatics tools in a pathogenomics approach to contribute to the annotation of Leishmania genomes, particularly regarding flagellar genes and their roles in pathogenesis. This resulted in the formal in silico identification of eight of these homologs in Leishmania (IFT subunits, 20, 27, 46, 52, 57, 88, 140, and 172), along with others (IFTs 71, 74/72, and 81), as well as sequence comparisons and structural predictions. IFT, an important flagellar pathway in Leishmania, begins to be revealed through screening of trypanosomatid genomes; this information could also be used to better understand fundamental processes in Leishmania, such as motility and pathogenesis.