3 research outputs found
Análise do microbioma procarionte de fêmeas e cultura celular embrionária de Rhipicephalus sanguineus linhagens tropical e temperada de duas localidades no Brasil
Two lineages of Rhipicephalus sanguineus are known in Brazil: the temperate or southern and the tropical or northern populations. The distribution patterns of both lineages of R. sanguineus have epidemiological implications that can affect vectorial competence concerning Ehrlichia canis, the agent of canine monocytic ehrlichiosis. Intending to identify the microbiomes of both lineages and compare microorganisms in R. sanguineus, we used the 16S rRNA (V4-V5 region) gene-based metataxonomic approach, through NGS sequencing on the MiSeq Illumina platform. We selected specimens of females from the environment and samples of primary embryonic cell cultures, from both lineages, and this was the first study to investigate the prokaryotic microbiome in tick cell cultures. The results showed that many bacterial taxa detected in the samples were typical members of the host environment. A significant diversity of microorganisms in R. sanguineus females and in embryonic cell cultures from both lineages was found, with emphasis on the presence of Coxiella in all samples, albeit in different proportions. The Coxiella species present in the two lineages of ticks may be different and may have co-evolved with them, thus driving different patterns of interactions between ticks and the pathogens that they can harbor or transmit to vertebrate hosts.Duas linhagens de Rhipicephalus sanguineus são conhecidas no Brasil: populações da linhagem temperada ou do sul, e tropical ou do norte. Os padrões de distribuição de ambas as linhagens de R. sanguineus têm implicações epidemiológicas, podendo afetar a competência vetorial de Ehrlichia canis, o agente etiológico da erliquiose monocítica canina. Com a intenção de identificar os microbiomas de ambas as linhagens e comparar microrganismos de R. sanguineus, foi utilizada a metataxonomia, baseada no gene 16S rRNA (região V4-V5), por meio do sequenciamento de nova geração na plataforma MiSeq Illumina. Foram selecionadas amostras de fêmeas do ambiente e cultivo primário de células embrionárias, considerando-se as duas linhagens conhecidas do Brasil. Este é o primeiro estudo que investiga o microbioma procariótico de células de cultura de carrapato. Os resultados mostram que muitos grupos de bactérias detectadas nas amostras são membros típicos do ambiente do hospedeiro. Uma diversidade significativa de microrganismos em fêmeas e cultura de células embrionárias nas duas linhagens de R. sanguineus foi encontrada, com ênfase na presença de Coxiella em todas as amostras, ainda que em diferentes proporções. Possivelmente, as espécies de Coxiella presentes nas duas linhagens de carrapatos são diferentes e co-evoluíram com essas linhagens, conduzindo a diferentes padrões de interação entre carrapatos e patógenos que podem abrigar ou transmitir aos hospedeiros vertebrados
Hepatozoon caimani in Caiman crocodilus yacare (Crocodylia, Alligatoridae) from North Pantanal, Brazil
Abstract Hepatozoon species are the most common intracellular hemoparasite found in reptiles. Hepatozoon caimani, whose vectors are Culex mosquitoes, has been detected in a high prevalence among caimans in Brazil by blood smears examinations. The present work aimed to detect and characterize the Hepatozoon spp. found in 33 caimans (24 free-ranging and 9 captive; 28 males and 5 females) (Caiman crocodilus yacare) sampled at Poconé, North Pantanal, state of Mato Grosso, Brazil, using blood smears examinations and molecular techniques. Hepatozoon spp.-gametocytes were found in 70.8% (17/24) and 88.8% (8/9) of blood smears from free-ranging and captive caimans, respectively. Hepatozoon spp. 18S rRNA DNA was found in 79.2% (19/24) and 88.8% (8/9) of free-ranging and captive caimans, respectively. Comparative analysis of parasitized and non-parasitized erythrocytes showed that all analyzed features were significantly different (P<0.05) for both linear and area dimensions. Phylogenetic analysis based on 18S rRNA sequences grouped the Hepatozoon spp. sequences detected in the present study together with H. caimani, recently detected in caimans in southern Pantanal