Characterization of novel GCDH pathogenic variants causing glutaric aciduria type 1 in the southeast of Mexico

Publication date: December 2019Source: Molecular Genetics and Metabolism Reports, Volume 21Author(s): Felix-Julian Campos-Garcia, Oscar F. Chacon-Camacho, Silvina Contreras-Capetillo, Marisa Cruz-Aguilar, Carolina E. Medina-Escobedo, Claudia M. Moreno-Graciano, Agustín Rodas, Luz del Alba Herrera-Perez, Juan C. ZentenoAbstractBiallelic mutations of the GCDH gene result in Glutaric Aciduria type 1 (GA1; OMIM #231670), an uncommon autosomal recessive inborn error caused by the deficiency of glutaryl-CoA dehydrogenase (CCDH), a mitochondrial matrix protein involved in the degradation of l-lysine, L-hydroxylysine, and L-tryptophan. The enzymatic deficiency leads to the accumulation of neurotoxins causing macrocephaly at birth, hypotonia and dystonia due to bilateral striatal injury, that evolves with aging, if untreated, to fixed dystonia and akinetic-rigid parkinsonism. In this article, we describe the results of molecular studies of 5 unrelated patients with GA1 in Southern Mexico. Mutational analysis identified 2 novel likely pathogenic GCDH variants (p.Leu130Pro and p.Gly391Val), 1 pathogenic variant that is predicted to cause a premature stop codon (p.Leu370*), and 2 previously reported pathogenic variants (p.Arg294Trp and p.Arg294Gln). The recurrence of the p.Leu130Pro variant (60% of mutant alleles) suggested a possible founder mutation effect. Our results expand the mutational spectrum in GA1 patients and support the importance of early diagnosis through newborn screenin...
Source: Molecular Genetics and Metabolism Reports - Category: Genetics & Stem Cells Source Type: research