Percorrer por autor "Grazina, M."
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- Advances in the diagnosis and understanding of mitochondrial cytopathies: a retrospective study of genetic and clinical variabilityPublication . Freitas, Keylene; Pinto, P. Lipari; Dias, P.; Florindo, C.; Gomes, D.; Oliveira, A.; Jotta, R.; Grazina, M.; Nogueira, Célia; Vilarinho, Laura; Gaspar, Ana; Janeiro, PatríciaIntroduction: Mitochondrial cytopathies (MCs) are a phenotypically heterogeneous group of inborn metabolic disorders (IMD) caused by mitochondrial respiratory chain dysfunction. Recent advances in molecular diagnostics have improved our understanding of these complex disorders. However, the extensive genetic and phenotypic heterogeneity of MCs remains only partially characterized and the correlations between specific genetic variants and clinical manifestations are just beginning to be unraveled. We hereby describe the phenotypic and genotypic variability of a cohort of 49 patients with MC.
- Brief report: High frequency of biochemical markers for mitochondrial dysfunction in autism: no association with the mitochondrial aspartate/glutamate carrier SLC25A12 genePublication . Correia, C.; Coutinho, A.M.; Diogo, L.; Grazina, M.; Marques, C.; Miguel, T.; Ataíde, A.; Almeida, J.; Borges, L.; Oliveira, C.; Oliveira, G.; Vicente, A.M.In the present study we confirm the previously reported high frequency of biochemical markers of mitochondrial dysfunction, namely hyperlactacidemia and increased lactate/pyruvate ratio, in a significant fraction of 210 autistic patients. We further examine the involvement of the mitochondrial aspartate/glutamate carrier gene (SLC25A12) in mitochondrial dysfunction associated with autism. We found no evidence of association of the SLC25A12 gene with lactate and lactate/pyruvate distributions or with autism in 241 nuclear families with one affected individual. We conclude that while mitochondrial dysfunction may be one of the most common medical conditions associated with autism, variation at the SLC25A12 gene does not explain the high frequency of mitochondrial dysfunction markers and is not associated with autism in this sample of autistic patients.