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COX10
cytochrome c oxidase assembly factor heme A:farnesyltransferase COX10
The COX10 gene provides instructions for a protein crucial in the final step of haem A biosynthesis, which is vital for the assembly and function of cytochrome c oxidase in mitochondria. The COX10 gene plays a central role in mitochondrial energy production by facilitating the modification of haem A, a prosthetic group within the cytochrome c oxidase enzyme.
COX10 is located on the short (p) arm of chromosome 17, at band 17p12. Arm ratio per GRCh38 - banding schematic.
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Overview
The COX10 gene, also known as cytochrome c oxidase assembly factor haem A:farnesyltransferase COX10, is fundamental to mitochondrial function. It encodes a protein that participates in the final steps of haem A biosynthesis, which is an essential component of cytochrome c oxidase (COX), also known as Complex IV of the electron transport chain. Proper COX activity is critical for cellular respiration, the process by which cells generate energy.
Disruptions in the COX10 gene can lead to impaired mitochondrial energy production, affecting various tissues and organs, particularly those with high energy demands such as the brain, heart, and skeletal muscles.
What the gene does
The protein encoded by the COX10 gene acts as a farnesyltransferase, an enzyme responsible for modifying haem O to haem A. This modification is the final step in the biosynthesis pathway for haem A. Haem A is a specific type of haem prosthetic group that is an indispensable component of cytochrome c oxidase (Complex IV), the terminal enzyme complex in the mitochondrial electron transport chain.
Cytochrome c oxidase is responsible for catalysing the transfer of electrons from reduced cytochrome c to molecular oxygen, a process that drives the generation of a proton gradient across the inner mitochondrial membrane. This proton gradient is then used by ATP synthase to produce adenosine triphosphate (ATP), the primary energy currency of the cell. Therefore, the function of the COX10 protein is directly linked to cellular energy production and overall mitochondrial health.
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Chromosome location
The COX10 gene is located on chromosome 17, specifically at band 17p12. This genomic coordinate identifies the precise position of the gene on the short arm of chromosome 17. The gene's location provides a physical address within the human genome, crucial for genetic mapping and understanding its inheritance patterns.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein.
Key variants
Genetic variants within the COX10 gene can alter the function or expression of the COX10 protein. These alterations can disrupt the normal biosynthesis of haem A, subsequently impairing the assembly or activity of cytochrome c oxidase. Pathogenic variants are typically inherited in an autosomal recessive pattern, meaning an individual must inherit two copies of the altered gene (one from each parent) to manifest a related condition.
Sample of pathogenic variants
6 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.1007A>T | p.Asp336Val | Pathogenic/Likely pathogenic | ★★☆☆ | Mitochondrial complex IV deficiency, nuclear type 3 |
GRCh37/hg19 17p12(chr17:14110043-14111913)x1 | - | Pathogenic | ★☆☆☆ | See cases |
GRCh37/hg19 17p12(chr17:13879079-14013128)x1 | - | Pathogenic | - | not provided |
c.1007A>G | p.Asp336Gly | Pathogenic | - | Mitochondrial complex IV deficiency, nuclear type 3 |
c.587C>A | p.Thr196Lys | Pathogenic | - | Mitochondrial complex IV deficiency, nuclear type 3 |
c.612C>A | p.Asn204Lys | Pathogenic | - | Mitochondrial complex IV deficiency, nuclear type 3 |
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 the COX10 gene are associated with mitochondrial disorders, primarily those involving isolated cytochrome c oxidase deficiency. Conditions linked to COX10 dysfunction can present with a wide spectrum of clinical manifestations, particularly affecting tissues with high energy needs. The severity and specific symptoms can vary significantly depending on the nature of the genetic variant and residual protein function, often impacting neurological, muscular, and cardiac systems.
No disease links recorded for this gene in our reference set.
Inheritance pattern
Conditions caused by pathogenic COX10 variants typically follow autosomal recessive inheritance.
When both parents are carriers, each child has a 25% chance of being affected, 50% of being a carrier, and 25% of being unaffected.
UK clinical status
In the UK, the COX10 gene is recognised on several NHS Genomic Medicine Service national panels, indicating its clinical significance for various conditions. It is listed on panels for "Childhood onset dystonia, chorea or related movement disorder", "Mitochondrial disorders", and "Mitochondrial disorder with complex IV deficiency (R356)". Other relevant panels include "DDG2P", "Inherited white matter disorders", "Intellectual disability (R29)", "Likely inborn error of metabolism (R98)", "Paediatric or syndromic cardiomyopathy (R135)", "Possible mitochondrial disorder - nuclear genes (R63)", "Structural basal ganglia disorders", "Undiagnosed metabolic disorders", and "White matter disorders and cerebral calcification - narrow panel".
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What is the primary role of the COX10 gene?
The COX10 gene provides instructions for a protein that is essential for the final step in the synthesis of haem A. Haem A is a key component required for the proper assembly and function of cytochrome c oxidase (Complex IV), which is crucial for cellular energy production in the mitochondria.
How are conditions related to COX10 typically inherited?
Conditions linked to pathogenic variants in the COX10 gene are generally inherited in an autosomal recessive manner. This means an individual must inherit two copies of the altered gene, one from each parent, to develop the condition.
Which body systems are most affected by COX10-related disorders?
Disorders associated with the COX10 gene often affect organs and tissues with high energy demands. This commonly includes the brain, heart, and skeletal muscles, leading to a range of neurological, cardiac, and muscular symptoms.