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

Valerio Leoni, Laura Strittmatter, Giovanna Zorzi, Federica Zibordi, Sabrina Dusi, Barbara Garavaglia, Paola Venco, Claudio Caccia, Amanda L. Souza, Amy Deik, Clary B. Clish, Marco Rimoldi, Emilio Ciusani, Enrico Bertini, Nardo Nardocci, Vamsi K. Mootha, Valeria Tiranti

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)463-471
Number of pages9
JournalMolecular Genetics and Metabolism
Volume105
Issue number3
DOIs
Publication statusPublished - Mar 2012

Keywords

  • Cholesterol
  • Coenzyme A
  • Metabolomics
  • Mitochondria
  • PKAN

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Genetics
  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

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