Cited by 54Cellular transport and secretionMetabolism and Genetic DisordersGlycogen Storage Diseases and Myoclonus

The phenotype associated with variants in TANGO2 may be explained by a dual role of the protein in ER‐to‐Golgi transport and at the mitochondria

Milev, Miroslav P., Saint‐Dic, Djenann, Zardoui, Khashayar, Klopstock, Thomas, Law, Christopher, Distelmaier, Felix, Sacher, Michael·2021·Journal of Inherited Metabolic Disease

Abstract

TANGO2 variants result in a complex disease phenotype consisting of recurrent crisis-induced rhabdomyolysis, encephalopathy, seizures, lactic acidosis, hypoglycemia, and cardiac arrhythmias. Although first described in a fruit fly model as a protein necessary for some aspect of Golgi function and organization, its role in the cell at a fundamental level has not been addressed. Such studies are necessary to better counsel families regarding treatment options and nutrition management to mitigate the metabolic aspects of the disease. The few studies performed to address the pathway(s) in which TANGO2 functions have led to enigmatic results, with some suggesting defects in membrane traffic while others suggest unknown mitochondrial defects. Here, we have performed a robust membrane trafficking assay on fibroblasts derived from three different individuals harboring TANGO2 variants and show that there is a significant delay in the movement of cargo between the endoplasmic reticulum and the Golgi. Importantly, this delay was attributed to a defect in TANGO2 function. We further show that a portion of TANGO2 protein localizes to the mitochondria through a necessary but not sufficient stretch of amino acids at the amino terminus of the protein. Fibroblasts from affected individuals also displayed changes in mitochondrial morphology. We conclude that TANGO2 functions in both membrane trafficking and in some as yet undetermined role in mitochondria physiology. The phenotype of affected individuals can be partially explained by this dual involvement of the protein.

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Crossref · 10.1002/jimd.12312

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Authors
Milev, M. P., Saint‐Dic, D., Zardoui, K., Klopstock, T., Law, C., Distelmaier, F., & Sacher, M.
Affiliations
  • Concordia University (CA)
  • German Center for Neurodegenerative Diseases (DE)
  • Centre for Microscopy and Cellular Imaging Concordia University Quebec Canada
  • Heinrich Heine University Düsseldorf (DE)
  • McGill University (CA)
Corresponding author
  • Distelmaier, Felix
  • Sacher, Michael
Venue
Journal of Inherited Metabolic Disease
Publisher
Wiley
Published
2020-09-21
Volume
44
Issue
2
Pages
426-437
ISSN
  • 0141-8955 (ISSN-L)
  • 1573-2665
OpenAlex
W3085561812
Cited by
53
References
23
Citations by year
2026: 10 · 2025: 14 · 2024: 6 · 2023: 10 · 2022: 9 · 2021: 4
FWCI
2.87
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Inherited Metabolic Disease (publishedVersion)
  • PubMed (publishedVersion)
  • DZNE Pub (submittedVersion)
Funders
  • Bundesministerium für Bildung und Forschung
  • Canadian Institutes of Health Research
  • Deutsche Forschungsgemeinschaft
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Health Sciences › Medicine › Rheumatology › Glycogen Storage Diseases and Myoclonus
Keywords
TANGO2, ER-Golgi transport, membrane trafficking, mitochondrial localization, mitochondrial morphology, rhabdomyolysis, lactic acidosis, hypoglycemia, cardiac arrhythmias, seizures, encephalopathy, fibroblasts, inborn errors of metabolism
MeSH terms
Arrhythmias, Cardiac, Endoplasmic Reticulum, Fibroblasts, Golgi Apparatus, Humans, Mitochondria, Mutation, Pedigree, Phenotype, Rhabdomyolysis, Genetic Predisposition to Disease, Protein Transport, Aryl Hydrocarbon Receptor Nuclear Translocator, Exome

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