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

Mol Genet Metab
Authors
Keywords
Abstract

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.

Year of Publication
2012
Journal
Mol Genet Metab
Volume
105
Issue
3
Pages
463-71
Date Published
2012 Mar
ISSN
1096-7206
URL
DOI
10.1016/j.ymgme.2011.12.005
PubMed ID
22221393
PubMed Central ID
PMC3487396
Links
Grant list
GTB07001 / 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