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Mol Genet Metab DOI:10.1016/j.ymgme.2011.12.005

Metabolic consequences of mitochondrial coenzyme A deficiency in patients with PANK2 mutations.

Publication TypeJournal Article
Year of Publication2012
AuthorsLeoni, V, Strittmatter, L, Zorzi, G, Zibordi, F, Dusi, S, Garavaglia, B, Venco, P, Caccia, C, Souza, AL, Deik, A, Clish, CB, Rimoldi, M, Ciusani, E, Bertini, E, Nardocci, N, Mootha, VK, Tiranti, V
JournalMol Genet Metab
Date Published2012 Mar
KeywordsAdolescent, Adult, Bile Acids and Salts, Child, Child, Preschool, Codon, Nonsense, Coenzyme A, Cohort Studies, Female, Humans, Iron Metabolism Disorders, Lactic Acid, Lipid Metabolism, Lipid Metabolism Disorders, Male, Metabolome, Mitochondria, Neuroaxonal Dystrophies, Pantothenate Kinase-Associated Neurodegeneration, Pantothenic Acid, Phosphotransferases (Alcohol Group Acceptor), Sphingomyelins, Young Adult

Pantothenate kinase-associated neurodegeneration (PKAN) is a rare, inborn error of metabolism characterized by iron accumulation in the basal ganglia and by the presence of dystonia, dysarthria, and retinal degeneration. Mutations in pantothenate kinase 2 (PANK2), the rate-limiting enzyme in mitochondrial coenzyme A biosynthesis, represent the most common genetic cause of this disorder. How mutations in this core metabolic enzyme give rise to such a broad clinical spectrum of pathology remains a mystery. To systematically explore its pathogenesis, we performed global metabolic profiling on plasma from a cohort of 14 genetically defined patients and 18 controls. Notably, lactate is elevated in PKAN patients, suggesting dysfunctional mitochondrial metabolism. As predicted, but never previously reported, pantothenate levels are higher in patients with premature stop mutations in PANK2. Global metabolic profiling and follow-up studies in patient-derived fibroblasts also reveal defects in bile acid conjugation and lipid metabolism, pathways that require coenzyme A. These findings raise a novel therapeutic hypothesis, namely, that dietary fats and bile acid supplements may hold potential as disease-modifying interventions. Our study illustrates the value of metabolic profiling as a tool for systematically exploring the biochemical basis of inherited metabolic diseases.


Alternate JournalMol. Genet. Metab.
PubMed ID22221393
PubMed Central IDPMC3487396
Grant ListGTB07001 / / Telethon / Italy
R01 DK081457 / DK / NIDDK NIH HHS / United States
R01 DK081457-01 / DK / NIDDK NIH HHS / United States
R01DK081457 / DK / NIDDK NIH HHS / United States