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TANGO2
transport and golgi organization 2 homolog
TANGO2 is located on the long (q) arm of chromosome 22, at band 22q11.21. Arm ratio per GRCh38 - banding schematic.
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Overview
TANGO2, which stands for transport and golgi organisation 2 homolog, encodes a protein whose precise molecular function remains under active investigation. Research suggests the protein participates in coordinating intracellular membrane trafficking and maintaining mitochondrial homeostasis. Variants that impair TANGO2 function have been associated with a rare multisystem disorder characterised by recurrent metabolic crises, developmental delays, and movement abnormalities. The condition typically presents in infancy or early childhood, though the severity and specific features can vary substantially between affected individuals. Understanding TANGO2 biology remains an area of ongoing research, with studies exploring how disruption of this protein leads to the observed clinical phenotype.
What the gene does
The TANGO2 protein is believed to facilitate communication between different compartments within the cell, particularly involving the Golgi apparatus and mitochondria. Evidence suggests it plays a supporting role in lipid metabolism and the cellular response to metabolic stress. When energy demands increase or nutrient availability decreases, cells rely on coordinated trafficking of metabolites and signalling molecules between organelles to maintain function. The TANGO2 protein appears to contribute to this coordination, though the exact molecular pathways remain incompletely defined. Laboratory studies indicate that loss of functional TANGO2 disrupts mitochondrial membrane integrity and impairs the cell's ability to generate energy efficiently through oxidative phosphorylation. This may explain why affected individuals experience acute metabolic crises during physiological stressors such as infection or fasting, when cellular energy demands are heightened. Further research is needed to fully elucidate the protein's interactions with other cellular components and its precise role in metabolic regulation.
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Chromosome location
The TANGO2 gene is located on chromosome 22 at position 22q11.21, a region that has been associated with various genomic disorders. The gene's position within this chromosomal band places it in proximity to other genes involved in development and cellular function. Structural details regarding the number of exons and overall genomic organisation have been characterised through molecular mapping studies, though the gene itself is relatively compact compared to many other disease-associated loci.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein. Computational analyses suggest the TANGO2 protein may contain regions that facilitate membrane association and protein-protein interactions, though these predictions await experimental validation. The lack of well-defined functional domains has made it challenging to predict precisely how individual amino acid changes affect protein activity, emphasising the importance of functional studies to understand variant pathogenicity.
Key variants
Pathogenic variants in TANGO2 typically result in reduced or absent protein function, though the full spectrum of disease-causing changes continues to emerge as more families are identified. Variants have been reported across different regions of the gene, including those predicted to cause premature protein truncation and those affecting conserved amino acid residues. The inheritance pattern can vary, with both autosomal recessive and potentially other modes described in the medical literature, reflecting the evolving understanding of this condition. Variant classification relies on a combination of computational predictions, functional studies where available, and clinical correlation.
Sample of pathogenic variants
10 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.250C>T | p.Gln84Ter | Pathogenic | ★★☆☆ | not provided |
c.256C>T | p.Arg86Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Recurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome |
c.262C>T | p.Arg88Ter | Pathogenic | ★★☆☆ | Recurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome |
c.280del | p.His94fs | Pathogenic/Likely pathogenic | ★★☆☆ | Recurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome |
c.35_36del | p.Pro12fs | Pathogenic | ★★☆☆ | not provided |
c.451+2T>A | - | Pathogenic/Likely pathogenic | ★★☆☆ | Inborn genetic diseases |
c.57-1G>C | - | Pathogenic/Likely pathogenic | ★★☆☆ | Recurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome |
c.634C>T | p.Gln212Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Recurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome |
c.711-3C>G | - | Pathogenic/Likely pathogenic | ★★☆☆ | Recurrent metabolic encephalomyopathic crises-rhabdomyolysis-cardiac arrhythmia-intellectual disability syndrome |
c.94C>T | p.Arg32Ter | Pathogenic/Likely pathogenic | ★★☆☆ | TANGO2-related disorder |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
Variants in TANGO2 have been linked to a complex metabolic disorder characterised by recurrent episodes of rhabdomyolysis, cardiac arrhythmias, and encephalopathy. Affected individuals may experience sudden deterioration during periods of metabolic stress, with potentially life-threatening complications including cardiac arrest. Between acute episodes, patients often exhibit developmental delays, intellectual disability, and movement disorders such as ataxia or dystonia. The condition shows considerable clinical variability, with some individuals experiencing frequent severe crises whilst others have a milder course with fewer acute events. Early recognition and metabolic management during illness can be crucial for preventing serious complications.
No disease links recorded for this gene in our reference set.
UK clinical status
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
How are TANGO2 variants inherited?
Most reported cases follow an autosomal recessive pattern, meaning an affected individual typically inherits one altered copy from each parent. Parents who each carry one variant copy are generally unaffected but have a 25% chance with each pregnancy of having an affected child.
What triggers metabolic crises in individuals with TANGO2 variants?
Metabolic crises are often precipitated by physiological stressors such as infections, fever, prolonged fasting, or periods of increased energy demand. These situations challenge the body's energy production systems, and individuals with impaired TANGO2 function may be unable to compensate effectively.
Is genetic testing for TANGO2 available in the UK?
Genetic testing for TANGO2 can be accessed through specialist metabolic or genetics services, particularly when clinical features suggest a mitochondrial or metabolic disorder. Testing decisions are typically guided by clinical presentation and family history, in consultation with healthcare professionals experienced in metabolic conditions.