The ACO2 gene gives your cells instructions for a protein that helps turn food into usable energy, especially inside the mitochondria (the parts of cells that make energy). This gene plays an important role in keeping the brain, eyes, and muscles supplied with steady energy. If the gene does not work properly, pathogenic variants can cause a rare inherited condition that may lead to developmental delay, balance or movement problems, seizures, and vision loss. Effects can vary quite a bit from one person to another.
What is a gene?
Genes are sections of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes carry the code for proteins, which are the parts of cells that do much of the work. Other genes mainly direct when certain processes happen, where they take place, and how strongly they operate. Together, genes influence how the body develops and functions, and they can also shape how you respond to food, stress, and medications. To go into this topic in more detail, you can find more in the LearnHub.
Overview
ACO2Gene function
What if the gene works
The ACO2 gene helps cells turn food into energy inside mitochondria. Its protein carries out a key step in the citric acid cycle, your cells' main energy pathway.
Risk
What if the gene does not work
Changes in the ACO2 gene can cause vision loss from optic nerve damage and problems with balance and coordination. Milder to more severe variants may change when symptoms begin and whether development or seizures are also affected.
Treatment
What does that mean for your treatment
For pathogenic or loss-of-function variants in the ACO2 gene, no treatment or drug choice approach specific to the ACO2 gene is currently established. Care is based on the person's symptoms and supportive management rather than a targeted medicine linked to the ACO2 gene.
Conditions associated with ACO2
Gene function
What if the gene works
Your cells need a steady way to turn food into usable energy. Inside mitochondria, the ACO2 gene helps keep one of the body’s main energy pathways moving. In simple terms, what the ACO2 gene does is guide an early step in the citric acid cycle, which helps cells make the energy they use all day.
Inside this energy pathway, the ACO2 gene helps change citrate into another closely related molecule called isocitrate. That small shift lets the cycle continue in the right order.
By moving the citric acid cycle forward, the ACO2 gene supports production of ATP (the cell’s main energy currency). This gives cells a steady supply of usable energy for everyday work.
The protein from the ACO2 gene works inside mitochondria, the parts of cells that make most of your cells’ energy. This helps cells process fuel in a controlled, routine way.
What is a variant?
Genetic variants are small changes in a gene’s DNA sequence. They are common and help explain normal differences between people, including appearance, metabolism, and the way the body reacts to environmental influences. Many have no noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more significantly and can contribute to, or cause, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the ACO2 gene often make the aconitase 2 protein unstable, less active, or absent, which can disrupt energy production inside mitochondria, the cell’s energy centers. Milder variants may leave some enzyme activity, while more severe variants can cause little to none. How ACO2 gene variants affect the protein helps explain why some people develop later, milder optic nerve or movement problems, while others have earlier and broader neurologic features.
How variants are linked to conditions
Pathogenic variants in the ACO2 gene can cause rare inherited neurologic and eye conditions. ACO2 gene variants linked to optic atrophy and cerebellar disease are most strongly associated with infantile cerebellar-retinal degeneration and optic atrophy 9. In affected people, these diagnoses may include vision loss along with balance and coordination problems, and some may also have developmental delay or seizures.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely found in the general population. Most do not directly affect health and instead represent normal human variation. For many genes, carrying a variant associated with a condition indicates a possible link rather than a confirmed diagnosis, especially when several genes and environmental factors also play a role. In some situations, though, one well-characterized variant in a particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the ACO2 gene. For many living with an ACO2 change, risk is shaped mainly by the exact genetic change, so a doctor or genetic counselor can help explain what it may mean for you or your family.
Inheritance of ACO2 variants
Variants in the ACO2 gene that cause ACO2 related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one changed copy from each parent, while parents with one changed copy are typically carriers. When both parents carry an ACO2 gene 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.
What does my ACO2 result mean for my family?
For ACO2-related conditions, the family pattern is usually recessive, which means parents are often healthy carriers and brothers or sisters may also be affected or be carriers. Close relatives may want to learn whether the same gene change runs in the family, especially if there is a history of vision loss, balance problems, or developmental concerns. The exact meaning for relatives depends on the specific ACO2 result and the condition linked to it.
Genetic information
Genetic testing
How you find out about variants
Finding variants in the ACO2 gene usually involves ACO2 genetic testing, which reads the gene’s DNA from a blood sample, cheek swab, or saliva sample. The lab compares your sequence with the usual version and reports whether a variant is present, which can help clarify whether an inherited condition is linked to the ACO2 gene.
When should I consider getting a genetic test?
Consider testing the ACO2 gene if a child has unexplained vision loss, poor balance, delayed development, seizures, or muscle stiffness, especially when these problems start early in life. Testing can also help when similar symptoms run in the family or when both parents are known carriers.
A genetic result is only one part of your health story
How much a genetic result can tell you depends on the condition involved and the type of variant identified, although it can still provide meaningful insight. Over time, many factors, including lifestyle, environment, age, and medical history, also influence how the body works. For some conditions, especially those affected by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, genetic results may also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body handles a medicine, so the same treatment may work a little differently from one person to another. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This is a common reason why a medication may help a lot in one person, help less in another, or cause more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences shape the way people respond to medications. It studies gene-drug patterns to clarify why the same treatment may work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body processes it. This information can support more informed, individualized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the ACO2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine response, so questions about side effects, new symptoms, or how your medicines may affect you are best discussed with your doctor or pharmacist.