The COX14 gene helps your cells build complex IV, a key part of the mitochondria, which are the cell’s energy makers. If it does not work properly, cells may struggle to make enough energy, and some people develop a mitochondrial condition with low muscle tone, weakness, developmental delay, feeding problems, seizures, or problems in organs with high energy needs. The protein made by this gene helps your cells assemble this energy system in a controlled way.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or direct processes in the body. Some genes provide the instructions for producing proteins, which are the working parts of cells. Others mainly help regulate when certain processes happen, where they happen, and how strongly they run. Taken together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. To explore this topic in greater depth, you can find more in the LearnHub.
Overview
COX14Gene function
What if the gene works
Inside mitochondria, the COX14 gene helps build complex IV, a key part of the cell’s energy system. This supports normal energy production from oxygen.
Risk
What if the gene does not work
More disruptive variants in the COX14 gene can impair mitochondrial complex IV assembly, causing a rare mitochondrial condition with low muscle tone, developmental delay, and weakness; milder variants may lead to later onset or less severe features.
Treatment
What does that mean for your treatment
For a pathogenic or loss-of-function variant in the COX14 gene, no COX14-specific treatment or drug selection approach is currently established. Care is guided by a person’s symptoms and general mitochondrial disease management rather than a targeted therapy linked to this gene.
Conditions associated with COX14
Gene function
What if the gene works
Inside your cells, the COX14 gene helps build a key part of the system that makes energy in mitochondria, the cell's energy centers. Its main job is to support the step by step assembly of complex IV, one of the protein machines used to turn oxygen into usable energy. This is central to how the COX14 gene supports mitochondrial energy production.
The COX14 gene helps your cells assemble complex IV, a mitochondrial protein machine that uses oxygen to support energy production. It acts during early building steps, helping the right parts come together in an orderly way.
This gene helps manage the making and early handling of COX1, an essential core piece of complex IV. By linking COX1 production to assembly, it helps cells build this energy making system at the right pace.
COX14 works in the inner membrane of mitochondria, where many energy related steps take place. There, it helps coordinate assembly partners so complex IV can be formed and prepared for routine cell use.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help explain normal differences between people, such as appearance, metabolism, or the way the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. Sometimes, however, a variant can change how a gene works more substantially and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
Variants in the COX14 gene can reduce how much COX14 protein is made or weaken its ability to help assemble complex IV, a key energy producing part of mitochondria (the cell’s energy centers). In practical terms, how COX14 gene variants affect cells often comes down to poorer complex IV assembly and lower enzyme activity. Milder variants may leave some residual function, while more severe variants can result in little or no working protein. When both gene copies are severely affected, symptoms often begin earlier and tend to be more marked.
How variants are linked to conditions
Disease-causing variants in the COX14 gene are linked to a rare mitochondrial disease called isolated complex IV deficiency. Reported cases have included low muscle tone, developmental delay, feeding difficulties, seizures, and sometimes heart problems, with severity varying between people. A confirmed disease-causing COX14 variant can establish the diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are a common, normal feature of human biology in the general population. Most do not have a direct effect on health and instead reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some situations, though, a single well characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There isn't yet broadly confirmed evidence on specific factors that increase or reduce risk related to the COX14 gene. For families with a known COX14 gene change, overall risk is mainly shaped by the inherited variant itself, and a doctor or genetic counselor can help explain personal and family risk.
Inheritance of COX14 variants
COX14-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one COX14 gene variant from each parent, and the parents are typically healthy carriers. When both parents carry a variant, each pregnancy has a 25% chance of the child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. In practical terms, how COX14 gene variants are inherited follows the usual autosomal recessive pattern, so it can affect sons and daughters equally.
What does my COX14 result mean for my family?
For families of someone with a disease-causing COX14 result, relatives can sometimes carry the same gene change without having symptoms. Brothers and sisters may also be affected or be carriers, so family members may wish to discuss whether testing would be useful for them. This pattern is usually recessive, which means it often becomes especially relevant for future pregnancies and for relatives planning children.
Genetic information
Genetic testing
How you find out about variants
Variants in the COX14 gene are found with genetic testing for COX14 variants, usually from a blood or saliva sample. A lab reads the DNA code in the COX14 gene, often as part of a mitochondrial disease panel or a broader DNA test, and reports whether a variant was identified.
When should I consider getting a genetic test?
Genetic testing for the COX14 gene may be considered when a baby or child has signs of a rare energy-production condition, such as severe muscle weakness, feeding problems, developmental delay, seizures, or high lactic acid on blood tests. It can also be relevant if a close relative has a known COX14 gene change.
A genetic result is only one part of your health story
Genetic test results can provide meaningful insight, but how much they reveal varies by the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body works over time. For some conditions, especially those shaped by many genes, genetic information adds context rather than certainty and is best understood as part of the broader picture of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, these results can help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes can change how the body breaks down a drug, moves it into tissues, or responds to its effects. This helps explain why the same medication may work well for one person, have less benefit for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic variation affects a person’s response to medicines. By looking at links between genes and medications, it helps explain why the same treatment may work differently in different people. For many drugs, genes influence both how strongly a medicine works and how the body processes it. This information can support more informed, more individualized treatment decisions. More about this topic is available in the LearnHub.
Drugs influenced by the COX14 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work or what side effects they may cause, so any questions about treatment, side effects, or new symptoms are best discussed with your doctor or pharmacist.