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1.
Hum Genet ; 109(1): 19-23, 2001 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-11479731

RESUMEN

Deficiency of mitochondrial 3-hydroxy-3-methylglutaryl-CoA synthase (mHMGS) is a recessive disorder of ketogenesis that has been previously diagnosed in two children with hypoglycaemic hypoketotic coma during fasting periods. Here, we report the results of molecular investigations in a third patient affected by this disease. Sequencing of the entire coding region of the HMGCS2 gene revealed two missense mutations, G212R and R500H. Mendelian inheritance was confirmed by the analysis of parental samples and neither of the mutations was found on 200 control chromosomes. Functional relevance was confirmed by in vitro expression studies in cytosolic HMGS-deficient cells. Whereas wild-type cDNA of the HMGCS2 gene reverted the auxotrophy for mevalonate, the cDNAs of the mutants did not. The disease may be recognised by specific clinical and biochemical features but it is difficult to confirm enzymatically since the gene is expressed only in liver and testis. Molecular studies may facilitate or confirm future diagnoses in affected patients.


Asunto(s)
Hidroximetilglutaril-CoA Sintasa/deficiencia , Hidroximetilglutaril-CoA Sintasa/genética , Mitocondrias/enzimología , Animales , Secuencia de Bases , Células CHO , Cricetinae , Análisis Mutacional de ADN , Cartilla de ADN/genética , ADN Complementario/genética , Femenino , Expresión Génica , Genes Recesivos , Humanos , Técnicas In Vitro , Lactante , Masculino , Mutagénesis Sitio-Dirigida , Mutación Missense
2.
Hum Genet ; 108(5): 404-8, 2001 May.
Artículo en Inglés | MEDLINE | ID: mdl-11409868

RESUMEN

We report a novel mild variant of medium-chain acyl-CoA dehydrogenase deficiency (MCADD) diagnosed in four infants who, in neonatal screening, showed abnormal acylcarnitine profiles indicative of MCADD. Three patients showed completely normal urinary organic acids and phenylpropionic acid loading tests were normal in all four patients. Enzyme studies showed residual MCAD activities between "classical" MCADD and heterozygotes. ACADM gene analysis revealed compound heterozygosity for the common mutation K329E and a novel mutation, Y67H, in two cases, and homozygosity for mutation G267R and the novel mutation S245L, respectively, in two children of consanguineous parents. As in other metabolic disorders, the distinction between "normal" and "disease" in MCAD deficiency is blurring into a spectrum of enzyme deficiency states caused by different mutations in the ACADM gene potentially influenced by factors affecting intracellular protein processing.


Asunto(s)
Acil-CoA Deshidrogenasas/deficiencia , Acil-CoA Deshidrogenasas/metabolismo , Carnitina/análogos & derivados , Mutación/genética , Acil-CoA Deshidrogenasa , Acil-CoA Deshidrogenasas/genética , Carnitina/sangre , Carnitina/metabolismo , Consanguinidad , Análisis Mutacional de ADN , Femenino , Fibroblastos , Variación Genética/genética , Alemania , Heterocigoto , Homocigoto , Humanos , Lactante , Linfocitos/enzimología , Masculino , Mutación Missense/genética , Fenilpropionatos/metabolismo , Procesamiento Proteico-Postraduccional/genética , Turquía
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