Bi-allelic Truncating Mutations in TANGO2 Cause Infancy-Onset Recurrent Metabolic Crises with Encephalocardiomyopathy

Laura S. Kremer, Felix Distelmaier, Bader Alhaddad, Maja Hempel, Arcangela Iuso, Clemens Küpper, Chris Mühlhausen, Reka Kovacs-Nagy, Robin Satanovskij, Elisabeth Graf, Riccardo Berutti, Gertrud Eckstein, Richard Durbin, Sascha Sauer, Georg F. Hoffmann, Tim M. Strom, René Santer, Thomas Meitinger, Thomas Klopstock, Holger ProkischTobias B. Haack

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Molecular diagnosis of mitochondrial disorders is challenging because of extreme clinical and genetic heterogeneity. By exome sequencing, we identified three different bi-allelic truncating mutations in TANGO2 in three unrelated individuals with infancy-onset episodic metabolic crises characterized by encephalopathy, hypoglycemia, rhabdomyolysis, arrhythmias, and laboratory findings suggestive of a defect in mitochondrial fatty acid oxidation. Over the course of the disease, all individuals developed global brain atrophy with cognitive impairment and pyramidal signs. TANGO2 (transport and Golgi organization 2) encodes a protein with a putative function in redistribution of Golgi membranes into the endoplasmic reticulum in Drosophila and a mitochondrial localization has been confirmed in mice. Investigation of palmitate-dependent respiration in mutant fibroblasts showed evidence of a functional defect in mitochondrial β-oxidation. Our results establish TANGO2 deficiency as a clinically recognizable cause of pediatric disease with multi-organ involvement.

Original languageEnglish
Pages (from-to)358-362
Number of pages5
JournalAmerican Journal of Human Genetics
Volume98
Issue number2
DOIs
StatePublished - 4 Feb 2016

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