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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2013.tde-08102013-091425
Document
Author
Full name
Michelle Cristina do Couto Brandi
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Ferreira, Marcelo Urbano (President)
Ribolla, Paulo Eduardo Martins
Teixeira, Marta Maria Geraldes
Title in Portuguese
Caracterização e padronização de marcadores genéticos para o estudo de polimorfismos em Plasmodium vivax.
Keywords in Portuguese
Plasmodium
Doenças parasitárias
Genética
Malária
Marcador molecular
Abstract in Portuguese
Este trabalho teve como objetivo caracterizar e padronizar métodos para a tipagem molecular de marcadores genéticos, para futuro uso em estudos de genética populacional de Plasmodium vivax na Amazônia brasileira. As amostras sanguíneas utilizadas neste estudo foram colhidas no Brasil, Camboja, Sri Lanka e Estados Unidos. Foram selecionados polimorfismos de única base (SNPs) distribuídos ao longo de cromossomos distintos de P. vivax; para estes polimorfismos, sete ensaios de tipagem de SNPs foram padronizados com sucesso. Com a tipagem molecular, foi possível definir haplótipos que caracterizam cada amostra, assim como identificar infecções geneticamente mistas (co-ocorrência de clones distintos na mesma amostra). No entanto, com este conjunto de marcadores não foi possível agrupar amostras de acordo com sua localização geográfica, por estes marcadores não serem suficientemente informativos do ponto de vista genético. Os sete SNPs avaliados, quando comparados a 13 marcadores de DNA microssatélite, revelaram menor proporção de infecções geneticamente mistas e menor diversidade genética.
Title in English
Characterization and standardization of genetic markers in the study of Plasmodium vivax polymorphisms.
Keywords in English
Plasmodium
Genetics
Malaria
Molecular marker
Parasitic diseases
Abstract in English
This study aimed to characterize and standardize methods for molecular typing of genetic markers to be used in the future in studies of population genetics of Plasmodium vivax population in the Brazilian Amazon. Blood samples used in this study were collected in Brazil, Cambodia, Sri Lanka and United States. Single nucleotide polymorphisms (SNPs), distributed over different P. vivax chromosomes were chosen and seven typing assays were sucessfully standardized. Molecular typing of polymorphisms allowed to define haplotypes that characterize each sample, as well as to identify genetically mixed infections (co-occurrence of different clones in the same sample). However, with this markers set, it was not possible to group samples according to their geographical location, because probably they are not sufficiently genetically informative. Compared to 13 microsatellite markers, these seven SNPs revealed a lower proportion of mixed-clone infections and lower genetic diversity.
 
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Publishing Date
2013-12-06
 
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