Brain metabolism and neurological symptoms in combined malonic and methylmalonic aciduria. 2020

Sara Tucci
Department of General Pediatrics and Adolescent Medicine, Laboratory of Clinical Biochemistry and Metabolism, Faculty of Medicine, Medical Center - University of Freiburg, University of Freiburg, Mathildenstrasse 1, 79106, Freiburg, Germany. sara.tucci@uniklinik-freiburg.de.

Combined malonic and methylmalonic aciduria (CMAMMA) is an inborn error of metabolism which has been proposed being a benign condition. However, older patients may present with neurological manifestations such as seizures, memory problems, psychiatric problems and/ or cognitive decline. In fibroblasts from CMAMMA patients we have recently demonstrated a dysregulation of energy metabolism with increased dependency on β-oxidation for energy production. Because of the inability of the brain to rely efficiently on this pathway to retrieve the required energy to a great extent, we hypothesize an alternative disease-causing mechanism that does not only include the accumulation of the metabolites malonic and methylmalonic acids. Here, we suggest a novel hypothesis on the possible pathophysiological mechanism responsible for the development of neurological symptoms in the long-run.

UI MeSH Term Description Entries
D008661 Metabolism, Inborn Errors Errors in metabolic processes resulting from inborn genetic mutations that are inherited or acquired in utero. Inborn Errors of Metabolism,Metabolism Errors, Inborn,Error, Inborn Metabolism,Errors Metabolism, Inborn,Errors Metabolisms, Inborn,Errors, Inborn Metabolism,Inborn Errors Metabolism,Inborn Errors Metabolisms,Inborn Metabolism Error,Inborn Metabolism Errors,Metabolism Error, Inborn,Metabolism Inborn Error,Metabolism Inborn Errors,Metabolisms, Inborn Errors
D008764 Methylmalonic Acid A malonic acid derivative which is a vital intermediate in the metabolism of fat and protein. Abnormalities in methylmalonic acid metabolism lead to methylmalonic aciduria. This metabolic disease is attributed to a block in the enzymatic conversion of methylmalonyl CoA to succinyl CoA. Acid, Methylmalonic
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000592 Amino Acid Metabolism, Inborn Errors Disorders affecting amino acid metabolism. The majority of these disorders are inherited and present in the neonatal period with metabolic disturbances (e.g., ACIDOSIS) and neurologic manifestations. They are present at birth, although they may not become symptomatic until later in life. Amino Acidopathies, Congenital,Amino Acid Metabolism Disorders, Inborn,Amino Acid Metabolism, Inborn Error,Amino Acid Metabolism, Inherited Disorders,Amino Acidopathies, Inborn,Congenital Amino Acidopathies,Inborn Errors, Amino Acid Metabolism,Inherited Errors of Amino Acid Metabolism,Amino Acidopathy, Congenital,Amino Acidopathy, Inborn,Congenital Amino Acidopathy,Inborn Amino Acidopathies,Inborn Amino Acidopathy
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