DEFAR - Artigos publicados em periódicos

URI permanente para esta coleçãohttp://www.hml.repositorio.ufop.br/handle/123456789/531

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2015 - 20202

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Tem arquivos: SimAssunto: search.filters.subject.Genotyping

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    Genetic evaluation of migratory fish : implications for conservation and stocking programs.
    (2020) Pimentel, Juliana da Silva Martins; Ludwig, Sandra; Resende, Leonardo Cardoso; Dias, Pedro Ferreira Pinto Brandão; Pereira, Adriana Heloísa; Abreu, Nazaré Lúcio de; Rosse, Izinara Cruz; Martins, Ana Paula Vimieiro; Facchin, Susanne; Lopes, João de Magalhães; Santos, Gilmar Bastos; Alves, Carlos Bernado Mascarenhas; Kalapothakis, Evanguedes
    Fish stocking programs have been implemented to mitigate the blockage of original riverbeds by the construction of hydropower dams, which affects the natural migra- tion of fish populations. However, this method raises concerns regarding the genetic rescue of the original populations of migratory fish species. We investigated the spa- tial distribution of genetic properties, such as genetic diversity, population structure, and gene flow (migration), of the Neotropical migratory fish Prochilodus costatus in the Três Marias dam in the São Francisco River basin, Brazil, and examined the possi- ble effects of fish stocking programs on P. costatus populations in this region. In total, 1,017 specimens were sampled from 12 natural sites and a fish stocking program, and genotyped for high-throughput sequencing at 8 microsatellite loci. The populations presented low genetic variability, with evidence of inbreeding and the presence of only four genetic pools; three pools were observed throughout the study region, and the fourth was exclusive to one area in the Paraopeba River. Additionally, we identi- fied high unidirectional gene flow between regions, and a preferred migratory route between the Pará River and the upper portion of the São Francisco River. The fish stocking program succeeded in transposing the genetic pools from downstream to upstream of the Três Marias dam, but, regrettably, promoted genetic homogenization in the upper São Francisco River basin. Moreover, the data show the fragility of this species at the genetic level. This monitoring strategy could be a model for the devel- opment of conservation and management measures for migratory fish populations that are consumed by humans.
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    Trypanosoma cruzi Discret Typing Units (TcII and TcVI) in samples of patients from two municipalities of the Jequitinhonha Valley, MG, Brazil, using two molecular typing strategies.
    (2015) Oliveira, Maykon Tavares de; Assis, Girley Francisco Machado de; Silva, Jaquelline Carla Valamiel de Oliveira e; Machado, Evandro Marques de Menezes; Silva, Glenda Nicioli da; Veloso, Vanja Maria; Macedo, Andréa Mara; Martins, Helen Rodrigues; Lana, Marta de
    Background: Trypanosoma cruzi is classified into six discrete taxonomic units (DTUs). For this classification, different biological markers and classification criteria have been used. The objective was to identify the genetic profile of T. cruzi samples isolated from patients of two municipalities of Jequitinhonha Valley, MG, Brazil. Methods: Molecular characterization was performed using two different criteria for T. cruzi typing to characterize 63 T. cruzi samples isolated from chronic Chagas disease patients. The characterizations followed two distinct methodologies. Additionally, the RAPD technique was used to evaluate the existence of genetic intragroup variability. Results: The first methodology identified 89 % of the samples as TcII, but it was not possible to define the genetic identity of seven isolates. The results obtained with the second methodology corroborated the classification as TcII of the same samples and defined the classification of the other seven as TcVI. RAPD analysis showed lower intra-group variability in TcII. Conclusions: The results confirmed the preliminary data obtained in other municipalities of the Jequitinhonha Valley, showing a predominance of TcII, similar to that verified in northeast/south axis of Brazil and the first detection of TcVI in the study region. The second protocol was more simple and reliable to identify samples of hybrid character.