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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Investigação citogenômica em pacientes com cardiopatias congênitas

Gomes, Thársis Gabryel January 2018 (has links)
Orientador: Lucilene Arilho Ribeiro-Bicudo / Resumo: As cardiopatias congênitas (CCs) podem ser definidas como qualquer anormalidade na estrutura e/ou na função cardiocirculatória presente ao nascimento. Constituem as malformações congênitas mais comuns entre recém-nascidos vivos, podendo se apresentar de duas formas: isoladas (ou não sindrômicas) e sindrômicas. De caráter multifatorial, o surgimento de CCs envolve fatores ambientais, genéticos e epigenéticos. A etiologia genética de CCs ainda é pouco conhecida. Entre as causas genéticas conhecidas, podemos destacar: aneuploidias, alterações na estrutura dos cromossomos, desequilíbrios citogenômicos (perdas e ganhos genômicos ou variações no número de cópias genômicas – CNVs), mutações pontuais, variações em um único nucleotídeo, entre outras. Dentre essas, as CNVs contribuem com aproximadamente 10% na etiologia genética de CCs não sindrômicas, e cerca de 20% entre as sindrômicas. O objetivo deste trabalho foi investigar possíveis desequilíbrios citogenômicos em pacientes diagnosticados com CCs sindrômicas e não sindrômicas idiopáticas. Foram recrutados 31 pacientes, sendo 13 sindrômicos e 18 não sindrômicos. Todos foram submetidos à avaliação genético-clínica. As amostras foram coletadas a partir do sangue periférico, e realizou-se o cariótipo convencional para todos os sindrômicos. A análise por MLPA foi realizada em 27 pacientes. O DNA genômico dos pacientes sindrômicos selecionados foi submetido a duas plataformas de CMA (array-CGH/SNP arrays): SNP-array 850K HumanCytoSNP (... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Congenital heart defects (CHD) can be defined as any abnormality in the structure and /or cardiocirculatory function present at birth. Congenital malformations are more common among live newborns. CHD can be presented at two forms: isolated (or non syndromic) and syndromic ones. Of multifactorial spectrum, the emergence of CHD involves environmental, genetic and epigenetic factors. The genetic etiology of CHD is still poorly understood. Among the known genetic causes, we can highlight: aneuploidies, changes in chromosome structure, cytogenetic imbalances (losses and genomic gains, can be also called copy number variations - CNVs), point mutations, variants in a single nucleotide, among others. Among these, CNVs contribute to approximately 10% in the genetic etiology of non-syndromic CHD, and about 20% among syndromic ones. The aim of this study was to investigate possible cytogenetic imbalances in patients diagnosed with idiopathic syndromic and non-syndromic CHD. Thirty one patients were recruited, of which 13 syndromic and 18 non-syndromic. Each patient were submitted to genetic-clinical evaluation. Only patients with an undefined syndromic condition were included in cytogenetic investigations. Samples were collected from the peripheral blood, and the conventional karyotype was performed for all syndromic patients. MLPA analysis was performed in 27 patients. The genomic DNA of the selected patients was analyzed into two CMA (array-CGH / SNP arrays) platforms: SNP-array 850K... (Complete abstract click electronic access below) / Mestre

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