Estudo de genes da Via Wnt e sua associacao com o Transtorno Afetivo Bipolar

=== Bipolar Disorder (BD) is a severe and chronic psychiatric illness with progressive increase in the severity of episodes. The prognosis for patients with BD is poor, with high rates of relapse in residual symptoms, cognitive impairment and decreased quality of life. A growing body of research su...

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Bibliographic Details
Main Author: Simone Becho de Campos
Other Authors: Humberto Correa da Silva Filho
Format: Others
Language:Portuguese
Published: Universidade Federal de Minas Gerais 2013
Online Access:http://hdl.handle.net/1843/BUBD-9FYGVM
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Summary:=== Bipolar Disorder (BD) is a severe and chronic psychiatric illness with progressive increase in the severity of episodes. The prognosis for patients with BD is poor, with high rates of relapse in residual symptoms, cognitive impairment and decreased quality of life. A growing body of research supports the assumption that BD arises from abnormalities in neuronal plasticity. Several lines of evidence suggests that the Wnt family is involved in this pathway since it is related to key developmental processes such as cell growth, migration and cell differentiation. Therefore, the aim of our study was to evaluate whether genes of the Wnt pathway are associated to BD and its comorbidities. Our sample consisted of 546 individuals: 306 patients with BD and 240 healthy controls. We used the genes WNT2B, WNT3A, WNT5A, WNT7A, APC1 and FZD3. We found no correlation between the studied tagSNPs and BD. However, we found a positive association between ACP1 tagSNP, rs7419262, and violent suicide attempt, and between the WNT2B tagSNPs, rs3790606 and rs351372, and generalized anxiety disorder as a comorbidity in patients with BD. We conclude that the Wnt pathway may be associated with susceptibility to BD and suicide. === O Transtorno Afetivo Bipolar (TAB) e um transtorno psiquiatrico grave, cronico e com progressivo aumento da gravidade dos episodios. O prognostico para os pacientes com TAB e pobre, com altas taxas de recaida, de sintomas residuais, disfuncoes cognitivas e de diminuicao da qualidade de vida. Um crescente corpo de estudos suporta a hipotese de que o TAB surge de anormalidades em cascatas de plasticidade celular, levando a processamento deficiente de informacao nas sinapses e circuitos de mediacao de funcoes afetivas e cognitivas. Varias linhas de evidencias sugerem que a via Wnt pode, tambem, estar envolvida na etiologia do TAB, pois esta via esta relacionada a processos de desenvolvimento essenciais tais como crescimento celular, migracao e diferenciacao celular. Por esse motivo, o objetivo do nosso estudo foi avaliar possiveis associacoes entre polimorfismos de alguns genes da via Wnt e a susceptibilidade ao TAB e comorbidades. Nossa amostra consistiu de 546 individuos, sendo 306 pacientes com TAB e 240 controles saudaveis. Utilizamos os genes WNT2B, WNT3A, WNT5A, WNT7A, APC1 e FZD3. Nas analises de associacao entre caso e controle, nao encontramos correlacao entre os tagSNPs estudados e o TAB. Encontramos associacao positiva entre o gene APC1, rs7419262, e tentativa de suicidio violenta e entre o gene WNT2B, rs3790606 e rs351372 e o transtorno de ansiedade generalizada como comorbidade em pacientes com TAB. Concluimos que a via Wnt pode estar associada a susceptibilidade ao TAB e suicidio.