Clinical presentation and proteomic signature of patients with TANGO2 mutations

Nadja Mingirulli, Angela Pyle, Denisa Hathazi, Charlotte L Alston, Nicolai Kohlschmidt, Gina O'Grady, Leigh Waddell, Frances Evesson, Sandra B T Cooper, Christian Turner, Jennifer Duff, Ana Topf, Delia Yubero, Cristina Jou, Andrés Nascimento, Carlos Ortez, Angels García-Cazorla, Claudia Gross, Maria O'Callaghan, Saikat SantraMaryanne A Preece, Michael Champion, Sergei Korenev, Efsthatia Chronopoulou, Majumdar Anirban, Germaine Pierre, Daniel McArthur, Kyle Thompson, Placido Navas, Antonia Ribes, Frederic Tort, Agatha Schlüter, Aurora Pujol, Raquel Montero, Georgia Sarquella, Hanns Lochmüller, Cecilia Jiménez-Mallebrera, Robert W Taylor, Rafael Artuch, Janbernd Kirschner, Sarah C Grünert, Andreas Roos, Rita Horvath

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Abstract

Transport And Golgi Organization protein 2 (TANGO2) deficiency has recently been identified as a rare metabolic disorder with a distinct clinical and biochemical phenotype of recurrent metabolic crises, hypoglycemia, lactic acidosis, rhabdomyolysis, arrhythmias, and encephalopathy with cognitive decline. We report nine subjects from seven independent families, and we studied muscle histology, respiratory chain enzyme activities in skeletal muscle and proteomic signature of fibroblasts. All nine subjects carried autosomal recessive TANGO2 mutations. Two carried the reported deletion of exons 3 to 9, one homozygous, one heterozygous with a 22q11.21 microdeletion inherited in trans. The other subjects carried three novel homozygous (c.262C>T/p.Arg88*; c.220A>C/p.Thr74Pro; c.380+1G>A), and two further novel heterozygous (c.6_9del/p.Phe6del); c.11-13delTCT/p.Phe5del mutations. Immunoblot analysis detected a significant decrease of TANGO2 protein. Muscle histology showed mild variation of fiber diameter, no ragged-red/cytochrome c oxidase-negative fibers and a defect of multiple respiratory chain enzymes and coenzyme Q10 (CoQ10 ) in two cases, suggesting a possible secondary defect of oxidative phosphorylation. Proteomic analysis in fibroblasts revealed significant changes in components of the mitochondrial fatty acid oxidation, plasma membrane, endoplasmic reticulum-Golgi network and secretory pathways. Clinical presentation of TANGO2 mutations is homogeneous and clinically recognizable. The hemizygous mutations in two patients suggest that some mutations leading to allele loss are difficult to detect. A combined defect of the respiratory chain enzymes and CoQ10 with altered levels of several membrane proteins provides molecular insights into the underlying pathophysiology and may guide rational new therapeutic interventions.

Original languageEnglish
Pages (from-to)297-308
Number of pages12
JournalJournal of Inherited Metabolic Disease
Volume43
Issue number2
Early online date13 Aug 2019
DOIs
Publication statusPublished - 3 Mar 2020

Keywords

  • fatty acid metabolism
  • metabolic encephalomyopathy
  • mitochondrial dysfunction
  • proteomic analysis
  • rhabdomyolysis
  • TANGO2

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    Mingirulli, N., Pyle, A., Hathazi, D., Alston, C. L., Kohlschmidt, N., O'Grady, G., Waddell, L., Evesson, F., Cooper, S. B. T., Turner, C., Duff, J., Topf, A., Yubero, D., Jou, C., Nascimento, A., Ortez, C., García-Cazorla, A., Gross, C., O'Callaghan, M., ... Horvath, R. (2020). Clinical presentation and proteomic signature of patients with TANGO2 mutations. Journal of Inherited Metabolic Disease, 43(2), 297-308. https://doi.org/10.1002/jimd.12156