Multiple-clone infections of Plasmodium vivax: definition of a panel of markers for molecular epidemiology

Submitted by Nuzia Santos ([email protected]) on 2016-02-29T17:46:50Z No. of bitstreams: 1 Multiple-clone infections of Plasmodium.pdf: 5467763 bytes, checksum: b4719a5dd04db8f670d04a87ecc9303f (MD5)Approved for entry into archive by Nuzia Santos ([email protected]) on 2016-02-29T17:50:22Z (GMT) No. of bitstreams: 1 Multiple-clone infections of Plasmodium.pdf: 5467763 bytes, checksum: b4719a5dd04db8f670d04a87ecc9303f (MD5)Made available in DSpace on 2016-02-29T17:50:22Z (GMT). No. of bitstreams: 1 Multiple-clone infections of Plasmodium.pdf: 5467763 bytes, checksum: b4719a5dd04db8f670d04a87ecc9303f (MD5) Previous issue date: 2015Fundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, BrasilFundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, BrasilUniversidade Federal de Mato Grosso. Hospital Julio Muller. Cuiabá, MT, BrasilFundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, BrasilFundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, BrasilFundação Oswaldo Cruz. Centro de Pesquisas René Rachou. Belo Horizonte, MG, BrasilBACKGROUND: Plasmodium vivax infections commonly contain multiple genetically distinct parasite clones. The detection of multiple-clone infections depends on several factors, such as the accuracy of the genotyping method, and the type and number of the molecular markers analysed. Characterizing the multiplicity of infection has broad implications that range from population genetic studies of the parasite to malaria treatment and control. This study compared and evaluated the efficiency of neutral and non-neutral markers that are widely used in studies of molecular epidemiology to detect the multiplicity of P. vivax infection. METHODS: The performance of six markers was evaluated using 11 mixtures of DNA with well-defined proportions of two different parasite genotypes for each marker. These mixtures were generated by mixing cloned PCR products or patient-derived genomic DNA. In addition, 51 samples of natural infections from the Brazil were genotyped for all markers. The PCR-capillary electrophoresis-based method was used to permit direct comparisons among the markers. The criteria for differentiating minor peaks from artifacts were also evaluated. RESULTS: The analysis of DNA mixtures showed that the tandem repeat MN21 and the polymorphic blocks 2 (msp1B2) and 10 (msp1B10) of merozoite surface protein-1 allowed for the estimation of the expected ratio of both alleles in the majority of preparations. Nevertheless, msp1B2 was not able to detect the majority of multiple-clone infections in field samples; it identified only 6 % of these infections. The merozoite surface protein-3 alpha and microsatellites (PvMS6 and PvMS7) did not accurately estimate the relative clonal proportions in artificial mixtures, but the microsatellites performed well in detecting natural multiple-clone infections. Notably, the use of a less stringent criterion to score rare alleles significantly increased the sensitivity of the detection of multi-clonal infections. CONCLUSIONS: Depending on the type of marker used, a considerable amplification bias was observed, which may have serious implications for the characterization of the complexity of a P. vivax infection. Based on the performance of markers in artificial mixtures of DNA and natural infections, a minimum panel of four genetic markers (PvMS6, PvMS7, MN21, and msp1B10) was defined, and these markers are highly informative regarding the genetic variability of P. vivax populations

Como será o amanhã? responda quem puder! perspectivas de enfermeirandos quanto ao seu futuro profissional

Estudo qualitativo que teve como objetivos: Identificar os fatores significativos na formação do enfermeiro; descortinar o perfil do enfermeiro na percepção do graduando; conhecer as perspectivas dos enfermeirandos quanto ao seu amanhã profissional. Teve como sujeitos 12 alunos concluintes do Curso de Graduação em Enfermagem de três Universidades de Pernambuco. Foram realizadas entrevistas gravadas e observação assistemática, nos meses de março e abril de 2003. Como resultados foram construídas as seguintes categorias: Escolha pela profissão de enfermagem; envolvimento com a formação profissional; reflexões quanto à formação acadêmica e perspectivas em relação ao futuro profissional