Every cell in your body uses the SCO1 gene to help mitochondria, the parts of cells that make energy, build a key energy making enzyme. If the gene does not work properly, cells may not make enough energy to support organs with high energy needs. Harmful variants in the SCO1 gene can cause a mitochondrial condition that may affect the heart, liver, brain, muscles, or nerves. Some people develop symptoms in infancy, such as poor feeding, weakness, breathing problems, or delayed development.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or manage activities in the body. Some genes provide the directions for producing proteins, which are the parts of cells that do much of the work. Others are used mainly to help regulate when certain processes happen, where they happen, and how active they are. Taken together, genes affect how your body grows and works, and they can influence how you react to food, stress, or medicines. For a deeper look at this topic, you can read more in the LearnHub.
Overview
SCO1Gene function
What if the gene works
The SCO1 gene helps cells build complex IV, a key part of the mitochondria that makes energy. It also helps move copper to the right place so this energy system can work well.
Risk
What if the gene does not work
Pathogenic variants in the SCO1 gene can impair mitochondrial energy production, causing complex IV deficiency with early liver disease, brain involvement, and sometimes heart problems. Milder or more severe variants can change which features appear and when they start.
Treatment
What does that mean for your treatment
No SCO1-specific treatment or drug selection approach is currently established in clinical guidelines. Care is supportive and guided by the person’s symptoms, while SCO1-related disease is being studied for ways to improve copper handling and mitochondrial function, but these approaches remain investigational.
Conditions associated with SCO1
Gene function
What if the gene works
Your cells use the SCO1 gene to help mitochondria, the parts of cells that make most of your energy, work smoothly. Its main job is to support the building of cytochrome c oxidase (an enzyme that helps cells use oxygen to release energy from food). This also depends on careful handling of copper, a trace mineral your cells need in tiny amounts.
The SCO1 gene's role in mitochondria includes helping assemble cytochrome c oxidase, a key part of the cell's energy-making chain. This helps mitochondria complete one of the final steps needed to make ATP, the cell's main fuel.
Inside mitochondria, the SCO1 gene helps guide copper to the right place while cytochrome c oxidase is being built. This gives the enzyme the copper it needs to do its job.
By supporting cytochrome c oxidase, the SCO1 gene helps cells use oxygen efficiently during energy production. This lets cells turn stored food energy into a usable form for routine work throughout the body.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can more substantially change how a gene works and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
How variants influence the SCO1 gene's function depends on how much they disrupt the SCO1 protein's shape, stability, or copper handling in mitochondria, the cell's energy-making parts. Some variants leave partial activity, while more disruptive variants sharply reduce the protein or block complex IV assembly. When both gene copies are strongly affected, cells make much less energy. Milder and more severe variants can help explain earlier or more pronounced mitochondrial disease.
How variants are linked to conditions
Among conditions linked to SCO1 gene variants, the main confirmed one is mitochondrial complex IV deficiency, a rare inherited mitochondrial condition. Pathogenic variants can confirm this diagnosis. Reported features include early feeding problems, poor growth, low muscle tone, developmental delay, lactic acidosis, liver disease, and sometimes heart involvement. Severity varies, but many children with this condition become unwell early in life.
A variant is not necessarily a diagnosis
Genetic variants are a common, normal part of being human. Most do not directly affect health and simply contribute to natural differences among people. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences play a role. Still, in some situations, one well understood variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For SCO1-related conditions, risk is mostly determined by genetics, especially whether a child inherits harmful changes in both copies of the SCO1 gene. There is not broadly confirmed evidence that diet, exercise, or other everyday factors meaningfully change this inherited risk.
Inheritance of SCO1 variants
SCO1-related conditions are usually inherited in an autosomal recessive pattern. This means a person inherits one changed copy of the SCO1 gene from each parent. Parents who each carry one SCO1 variant are often unaffected carriers, and with each pregnancy there is a 25% chance the child inherits both changed copies, a 50% chance the child is a carrier, and a 25% chance the child inherits neither changed copy. Sons and daughters are affected equally because the SCO1 gene is on chromosome 17, not a sex chromosome.
What does my SCO1 result mean for my family?
For SCO1, the main family implication is usually a recessive pattern, which means parents can be healthy carriers and siblings may also carry the same gene change or, in some families, be affected. Close relatives may want to learn whether they are carriers, especially if there is a family history of a similar condition or if they are planning children. The meaning for relatives depends on the exact SCO1 result found in the family.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for SCO1 variants is usually done with a blood sample, though saliva may also be used. A lab reads the SCO1 gene to look for sequence changes and may also check for missing or extra pieces of DNA. Results can help confirm the cause of a person’s symptoms or clarify whether a family member carries the same variant.
When should I consider getting a genetic test?
Consider SCO1 testing if a baby or child has signs of an inherited condition where cells struggle to make energy, especially with liver disease, heart problems, poor growth, muscle weakness, or developmental delay, or if the same pattern runs in the family. It can also help clarify chances for future children after an affected child or a known SCO1 gene change.
A genetic result is only one part of your health story
A genetic finding may be informative, but how much it can tell you varies with the condition and the kind of variant involved. Over time, many influences shape how the body works, including lifestyle, environment, age, and medical history. For some conditions, especially those affected by many genes, genetic information offers context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas such as medication response, genetic results can also help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment can work well for one person, cause more side effects in another, or seem to have less effect, and these differences are common in everyday care.
What is Pharmacogenetics?
Pharmacogenetics examines how inherited genetic differences can affect a person’s response to medicines. It looks at connections between genes and medications to help explain why the same treatment may work differently from one person to another. For many drugs, genes can influence both how strongly a medicine works and how the body handles it. Understanding this can support treatment decisions that are more informed and more individualized. You can read more about this topic in the LearnHub.
Drugs influenced by the SCO1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose, so questions about medicines, side effects, or changes in your health are best discussed with your doctor.