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COX6B1
cytochrome c oxidase subunit 6B1
The COX6B1 gene provides instructions for making a protein that is a crucial component of cytochrome c oxidase, an enzyme essential for cellular energy production within mitochondria. COX6B1 encodes subunit 6B1 of cytochrome c oxidase (CcO), also known as Complex IV.
COX6B1 is located on the long (q) arm of chromosome 19, at band 19q13.12. Arm ratio per GRCh38 - banding schematic.
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Overview
The COX6B1 gene, or cytochrome c oxidase subunit 6B1, is involved in the formation of an enzyme called cytochrome c oxidase (CcO). This enzyme is located in the mitochondria, often referred to as the 'powerhouses' of the cell. CcO is responsible for the final step in the electron transport chain, a complex process that generates most of the cell's energy in the form of adenosine triphosphate (ATP).
Proper function of COX6B1 is therefore vital for cellular respiration and maintaining the energy supply required for all bodily functions.
What the gene does
The protein produced from the COX6B1 gene is a nuclear-encoded subunit of the mitochondrial cytochrome c oxidase (Complex IV). Cytochrome c oxidase is a large enzyme complex embedded in the inner mitochondrial membrane, comprising multiple protein subunits. Its primary role is to catalyse the transfer of electrons from reduced cytochrome c to molecular oxygen, reducing oxygen to water.
This electron transfer is coupled with the pumping of protons across the inner mitochondrial membrane, creating an electrochemical gradient. This gradient is then used by ATP synthase to produce ATP. COX6B1, specifically subunit 6B1, contributes to the structural integrity and catalytic activity of the entire cytochrome c oxidase complex, ensuring efficient energy conversion within the cell.
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Chromosome location
The COX6B1 gene is situated on chromosome 19, specifically at position 19q13.12. Chromosomes are organised structures of DNA found within cells, and 'q' refers to the long arm of the chromosome, while '13.12' denotes the specific band location on that arm.
Protein structure
The COX6B1 protein is 86 amino acids in length. It contains several important structural features. A key functional domain is the CHCH domain, spanning amino acids 27-73. Within this domain, two crucial motifs are identified: the Cx9C motif (amino acids 30-40) and the Cx10C motif (amino acids 54-65). These domains and motifs are typically involved in protein folding and interactions within the larger cytochrome c oxidase complex.
Key variants
Variations within the COX6B1 gene can lead to alterations in the structure or function of the cytochrome c oxidase subunit 6B1 protein. These genetic changes can range from single nucleotide differences to larger deletions or insertions, potentially impacting the protein's stability, its ability to integrate into the enzyme complex, or the overall efficiency of the cytochrome c oxidase enzyme. The clinical consequences of such variants can vary significantly depending on their nature and location.
No pathogenic or likely-pathogenic ClinVar variants recorded yet for this gene.
Associated conditions
Inherited conditions associated with the COX6B1 gene often relate to its critical role in mitochondrial energy production. Disruptions in the cytochrome c oxidase enzyme, due to changes in COX6B1, can impair cellular respiration and lead to a spectrum of mitochondrial disorders. These conditions can affect various organ systems, as energy production is fundamental to all bodily tissues.
No disease links recorded for this gene in our reference set.
UK clinical status
The COX6B1 gene is recognised within the UK's NHS Genomic Medicine Service, indicating its clinical relevance. It is included on several NHS clinical panels, such as those for "Mitochondrial disorders", "Likely inborn error of metabolism", and "Undiagnosed metabolic disorders". Furthermore, it is specifically listed on panels like "Mitochondrial disorder with complex IV deficiency (R356)" and "Possible mitochondrial disorder - nuclear genes (R63)", highlighting its association with complex IV deficiencies and other mitochondrial conditions.
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What is the main function of the COX6B1 gene?
The COX6B1 gene provides instructions for a protein that is a subunit of cytochrome c oxidase (Complex IV), an enzyme critical for the final step of cellular respiration in mitochondria, where it helps produce cellular energy (ATP).
Where is the COX6B1 gene located?
The COX6B1 gene is found on chromosome 19, specifically at the band position 19q13.12. This indicates its location on the long arm of chromosome 19.
Why is COX6B1 important for health?
COX6B1 is vital for health because its protein product is essential for the proper functioning of cytochrome c oxidase, ensuring efficient energy production in cells. Dysfunction can lead to various mitochondrial disorders affecting multiple organ systems.