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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

Rastreamento do polimorfismo na enzima desiodase tipo 2 (D2) em indivíduos com síndrome de Williams-Beuren

Capra, Siriana Mansur 06 June 2016 (has links)
Submitted by Marta Toyoda (1144061@mackenzie.br) on 2017-01-06T21:12:59Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Siriana Mansur Capra.pdf: 1176760 bytes, checksum: 6843d3b90c5a839e5c35dba7eb3473c5 (MD5) / Approved for entry into archive by Paola Damato (repositorio@mackenzie.br) on 2017-01-16T11:41:43Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Siriana Mansur Capra.pdf: 1176760 bytes, checksum: 6843d3b90c5a839e5c35dba7eb3473c5 (MD5) / Made available in DSpace on 2017-01-16T11:41:43Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Siriana Mansur Capra.pdf: 1176760 bytes, checksum: 6843d3b90c5a839e5c35dba7eb3473c5 (MD5) Previous issue date: 2016-06-06 / Williams-Beuren syndrome (WBS) is caused by microdeletions in the region 7q11.23. The main clinical features of the syndrome are congenital heart disease, typical facial dysmorphisms, friendly personality and intellectual disabilities. Previous studies have shown that polymorphism in the gene encoding the enzyme responsible for conversion of T4 to T3, the deiodinase type 2 (D2) does not alter its catalytic activity, but are positively associated with neuropsychiatric disorders and intellectual impairment, bipolar disorder and depression. Later it was demonstrated that polymorphic D2 (Thr92Ala-D2) alters the expression of genes involved in oxidative stress also altered in individuals with Alzheimer's disease. Taken together, we hipostenizamos the Thr92Ala-D2 might be related to cognitive impairment in individuals with SWB. Thus, this study aimed to track the frequency of polymorphism in a group of 63 patients with SWB and correlate the presence of the polymorphism with its indicators of intellectual functioning. Participants were 4-37 years on molecular diagnosis of SWB and were matched for sex and age. The DNA from patients was obtained from the collection of buccal epithelial cells using Swab and mutation status was determined by the technique of Polymerase Chain Reaction (PCR). Intellectual performance of participants was assessed by the instruments: WASI, WISC-III or WAIS-III. 10 individuals were identified polymorphic (A / A) and 39 heterozygotes (T / A), featuring 15.88% and 61.90% of the study population, respectively. 21 patients were evaluated and the IQ values ranged from 37 to 72, characterized intellectual deficit, mild to moderate, as described in the literature. There was no significant correlation between the presence of the polymorphism and IQ patients, even when the sample was stratified according to gender. Two patients heterozygous for the polymorphism had subclinical hypothyroidism and IQ values were 42.2 and 37. We note a full IQ downward trend as there is an increase in serum levels of TSH, although no statistical significance. / A Síndrome de Williams-Beuren (SWB) é causada por microdeleções na região 7q11.23. As principais características clínicas da síndrome são cardiopatia congênita, dismorfismos faciais típicos, habilidade social e deficiência intelectual. Estudos anteriores mostraram que polimorfismos no gene que codifica a enzima responsável pela transformação de T4 em T3, a Desiodase do tipo 2 (D2), não alteram sua atividade catalítica, mas estão positivamente relacionadas com transtornos neuropsiquiátricos, como deficiência intelectual, bipolaridade e depressão. Posteriormente foi demonstrado que a D2 polimórfica (Thr92Ala-D2) altera a expressão de genes envolvidos com o stress oxidativo, também alterados em indivíduos com doença de Alzheimer. Tomados em conjunto, nós hipostenizamos que a Thr92Ala-D2 poderia estar relacionada com déficit cognitivo em indivíduos com SWB. Assim, o presente estudo teve como objetivo rastrear a frequência do polimorfismo em um grupo de 63 pacientes com SWB e correlacionar a presença do polimorfismo com seus indicadores de funcionamento intelectual. Os participantes tinham de 4 a 37 anos com diagnóstico molecular de SWB e foram pareados por sexo e idade. O DNA dos pacientes foi obtido pela coleta de células do epitélio bucal utilizando Swab e a presença da mutação foi determinada pela técnica de Polymerase Chain Reaction (PCR). O desempenho intelectual dos participantes foi avaliado pelos instrumentos: WASI, WISC-III ou WAIS-III. Foram identificados 10 indivíduos polimórficos (A/A) e 39 indivíduos heterozigotos (T/A), caracterizando 15,88% e 61,90% da população estudada, respectivamente. 21 pacientes foram avaliados e os valores de QI variaram entre 37 a 72, caracterizando déficit intelectual de leve a moderado, como descrito na literatura. Não houve correlação significativa entre a presença do polimorfismo e o QI dos pacientes, nem mesmo quando estratificamos a amostra de acordo com o sexo. Dois pacientes heterozigotos para o polimorfismo apresentaram hipotireoidismo subclínico e os valores de QI foram de 42,2 e 37. Notamos uma tendência de diminuição do QI total conforme há aumento nos níveis séricos de TSH, apesar de não haver significância estatística.

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