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Strategy of molecular investigation on epilepsy with the identification of genes related to poymicrogyrias

Author(s):
Simone Sayuri Tsuneda
Total Authors: 1
Document type: Doctoral Thesis
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Ciências Médicas
Defense date:
Examining board members:
Vera Lucia Gil da Silva Lopes; Tiago Campos Pereira; Ana Lúcia Brunialti Godard; Claudia Vianna Maurer Morelli
Advisor: Iscia Teresinha Lopes Cendes
Abstract

Polimicrogyria (PMG) is a cortical malformation caused by failures during the brain cortex development process and is characterized by an excessive number of small gyri, resulting in an irregular cortical surface. The severity of its clinical manifestations is directly related to the extension of the tissue abnormalities. Bilateral Perisylvian Polimicrogyria (BPP) is the most comum and, consequently, a very well described syndrome that affects the cortex surrounding the Sylvian fissures in both hemispheres. The genetic pattern for BPP was initially described by Borgatti et al. as an X-linked pattern, confirmed by Guerreiro et al. in 2000, but with no specific gene identified. We have recently described a candidate site for BPP at the Xq27.1-27.3 region and, in this project, we proposed to evaluate this site through next generation sequencing technology combined with capture technology. Our results suggest that MAGEC1 and UBE2NL genes, or the SPANXC gene area might be related to the pathogeny in this case, however a further analysis brought up the hypothesis of a complex relation between the MAGEC1 mutations and the clinical manifestations in each different patient. Considering recurrent description of relations between microtubule genes and cortex malformations, we also performed the evaluation of exon regions of eight selected genes from sporadic patients and BPP families through DHPLC and sequencing. The analysis focused on AFF2, SLITRK2 and SLITRK4 genes, located at the identified site, microtubule genes TUBA1A, TUBB2B and TUBA8, and SRPX2 and WDR62 genes, also related to cortical malformations. As a result from this screening, we identified a potentially pathogenic mutation in gene AFF2. All non-synonymous SNPs were evaluated using the in silico tools MutPred, SNPs&GO, Polyphen 2, Panther and SIFT, providing further insights for their analysis. A control group of individuals was analyzed for the presence of the non-described SNPs. These data suggest a pathogenic potential for these genetic alterations that must be investigated through function studies. (AU)