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NDUFA11
NADH:ubiquinone oxidoreductase subunit A11
NDUFA11 is located on the short (p) arm of chromosome 19, at band 19p13.3. Arm ratio per GRCh38 - banding schematic.
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Overview
NDUFA11 (NADH:ubiquinone oxidoreductase subunit A11) is located on chromosome 19 and encodes one of the accessory subunits of mitochondrial Complex I. Complex I is the largest enzyme complex in the mitochondrial respiratory chain, comprising more than 40 different protein subunits that work together to transfer electrons and pump protons across the inner mitochondrial membrane.
Whilst the core catalytic subunits of Complex I are encoded by mitochondrial DNA, NDUFA11 is among the nuclear-encoded accessory proteins that contribute to the structural stability and efficient assembly of the complete enzyme. These accessory subunits are essential for maintaining proper Complex I function, and disruptions can compromise cellular energy metabolism. The gene's expression is particularly important in tissues with high energy requirements, such as the brain, heart, and skeletal muscle.
What the gene does
The NDUFA11 protein functions as an accessory subunit within mitochondrial Complex I, which catalyses the first step of oxidative phosphorylation. Complex I accepts electrons from NADH (produced during nutrient breakdown) and transfers them to ubiquinone, simultaneously translocating protons from the mitochondrial matrix to the intermembrane space. This proton gradient drives ATP synthesis, the cell's primary energy currency.
Accessory subunits like NDUFA11 do not participate directly in electron transfer but are thought to stabilise the enzyme's architecture and facilitate its correct assembly within the inner mitochondrial membrane. Research suggests that these structural components help maintain the integrity of the complex under varying metabolic conditions and may play regulatory roles in modulating enzyme activity. The precise molecular interactions of NDUFA11 within the assembled complex remain an active area of investigation, though it is understood that proper incorporation of all accessory subunits is necessary for Complex I to achieve its full catalytic efficiency.
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Chromosome location
NDUFA11 is located on the short arm of chromosome 19 at position 13.3 (19p13.3). This chromosomal region contains numerous genes involved in various metabolic and cellular processes. The gene structure and exon organisation have not been comprehensively detailed in public databases, reflecting the relatively recent characterisation of many Complex I accessory subunit genes compared to the core catalytic components.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein.
Key variants
Genetic variants in NDUFA11 can affect the stability or assembly of Complex I, potentially leading to reduced enzyme activity and impaired cellular energy production. Pathogenic changes may include missense variants that alter critical amino acids, nonsense variants that truncate the protein, or splice-site variants that disrupt normal RNA processing. The clinical significance of many NDUFA11 variants remains under investigation, as the gene's association with human disease has only recently been recognised.
Sample of pathogenic variants
1 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.314-2A>G | - | Pathogenic | ★☆☆☆ | not provided |
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
Changes in NDUFA11 have been associated with mitochondrial Complex I deficiency, a heterogeneous group of disorders characterised by impaired cellular energy metabolism. Affected individuals may present with a range of clinical features depending on which tissues are most severely affected, often including neurological manifestations, developmental delay, or muscle weakness. The phenotypic spectrum associated with NDUFA11 variants is still being defined as additional cases are identified and reported in the medical literature.
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
What does the NDUFA11 gene do?
NDUFA11 provides instructions for making an accessory protein subunit of mitochondrial Complex I, which is the first enzyme in the chain of reactions that generates cellular energy from nutrients. The protein helps stabilise and assemble this large enzyme complex.
How is NDUFA11 inherited?
NDUFA11 is a nuclear gene, meaning it is inherited in a Mendelian fashion from both parents. The specific inheritance pattern for disease-associated variants can vary depending on the nature of the genetic change and its functional impact on Complex I activity.
What happens if NDUFA11 is not working properly?
When NDUFA11 is not functioning correctly, cells may produce less energy efficiently, particularly affecting organs with high metabolic demands such as the brain and muscles. This can lead to a range of clinical features associated with mitochondrial dysfunction.