RESUMO
TITLE: Dos nuevos casos de sindrome de Leigh por mutacion m.13513G>A en el gen MTND5.
Assuntos
DNA Mitocondrial/genética , Complexo I de Transporte de Elétrons/genética , Doença de Leigh/genética , Proteínas Mitocondriais/genética , Mutação de Sentido Incorreto , Mutação Puntual , Blefaroptose/genética , Progressão da Doença , Complexo I de Transporte de Elétrons/fisiologia , Feminino , Retardo do Crescimento Fetal/genética , Gastroenteropatias/genética , Heterogeneidade Genética , Humanos , Lactente , Deficiência Intelectual/genética , Masculino , Proteínas Mitocondriais/fisiologia , Oftalmoplegia/genética , Fenótipo , Síndrome de Wolff-Parkinson-White/genéticaRESUMO
OBJECTIVES: We analyzed the percentage of mitochondrial DNA (mtDNA) heteroplasmy in blood samples of 13 individuals belonging to a three family generation of myoclonic epilepsy with ragged-red fibers (MERRF) and compared the 5 affected patients and the 8 unaffected relatives. MATERIAL AND METHODS: DNA was extracted from blood and muscle of the proband and from blood of 12 maternal relatives. A PCR restriction analysis method was used to detect the mutation. RESULTS: The proband had the complete MERRF phenotype. The phenotype in three other individuals in the maternal lineage was consistent with the MERRF syndrome. The remaining were asymptomatic. The np 8344 mutation was observed in muscle and blood of the proband, and in blood from every one of 12 maternal relatives, ranging from 44% to 83% of mutated genomes. Symptomatic individuals had higher levels (P < 0.001) of mutated mtDNA than asymptomatic maternal relatives. However, high proportions of mutant genomes (up to 63%) were found in asymptomatic relatives. CONCLUSIONS: Although there seems to be a gene dosage effect in MERRF, we found no absolute relationship between the relative proportion of mutant genomes in blood and clinical severity. Factors other than gene dosage in blood may account for the differences in clinical phenotype.
