The SLC25A46 gene helps nerve cells keep mitochondria, the parts of cells that make energy, healthy and properly shaped. When this gene does not work well, the eyes, brain, and peripheral nerves may be affected, which can lead to vision loss, muscle weakness, poor balance, or developmental delay. This gene plays an important role in how cells handle energy, especially in tissues that need a steady supply.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or direct processes in the body. Some genes hold the code for proteins, the parts of cells that carry out much of the work. Others mainly regulate when certain processes happen, where they occur, 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, and medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
SLC25A46Gene function
What if the gene works
The SLC25A46 gene helps keep mitochondria, your cells’ energy centers, in their usual shape and network. This supports energy production and healthy nerve cell function.
Risk
What if the gene does not work
Variants in the SLC25A46 gene can affect nerves, vision, balance, and development. Milder variants may cause later-onset optic atrophy or peripheral neuropathy, while more severe variants often lead to earlier movement problems, ataxia, developmental delay, and brain involvement.
Treatment
What does that mean for your treatment
No SLC25A46-specific treatment or management approach is currently established. The SLC25A46 gene is being studied in research on how cells manage energy, which may help guide future therapies.
Conditions associated with SLC25A46
Gene function
What if the gene works
Your cells rely on the SLC25A46 gene to keep mitochondria, the parts that make usable energy, well organized. This helps explain how the SLC25A46 gene supports mitochondrial function in everyday cell life.
The SLC25A46 gene helps control the shape and layout of mitochondria. It supports the normal balance of joining and splitting so these energy making structures stay arranged for routine cell work.
Its protein sits in the outer membrane of mitochondria and helps connect outer and inner membrane systems. These links support stable structure and help different parts of the mitochondrion work in step.
SLC25A46 helps maintain cristae, the inner folds inside mitochondria. These folds create the organized surface needed for efficient energy production.
This gene also helps maintain the lipid makeup of mitochondrial membranes. Healthy membrane lipids help mitochondria stay flexible, keep their shape, and carry out everyday tasks.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not produce any noticeable effect and are simply part of natural genetic variation. In some situations, 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 SLC25A46 gene often make the protein less stable or stop it from reaching the outer membrane of mitochondria, the parts of cells that handle energy. Some changes weaken its folding or its links with partner proteins that help maintain mitochondrial shape, while more disruptive variants can leave very little working protein. This range helps explain how SLC25A46 gene variants affect mitochondria and why some people develop earlier, broader symptoms while others have a milder course.
How variants are linked to conditions
Pathogenic variants in both copies of the SLC25A46 gene cause a rare inherited condition spectrum that can include optic atrophy, peripheral neuropathy, balance problems, and muscle weakness. In the medical literature, SLC25A46 gene variants linked to optic atrophy and neuropathy may also be described under names such as hereditary motor and sensory neuropathy with optic atrophy. Some people have milder later-onset symptoms, while others have early childhood forms with developmental delay, seizures, or brain changes such as pontocerebellar hypoplasia or Leigh syndrome.
A variant is not necessarily a diagnosis
Variants in genes are a common and expected part of human biology. Most do not directly affect health and simply reflect natural differences among people. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, especially when several genes and environmental influences also play a role. In some situations, though, one well-characterized variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For SLC25A46, risk is mainly shaped by genetics rather than lifestyle. A child’s chance of having an SLC25A46-related condition is higher when both parents carry a harmful change in this gene, and this can be more likely in families with a shared background or blood-related parents.
Inheritance of SLC25A46 variants
SLC25A46-related conditions are usually inherited in an autosomal recessive pattern. In plain terms, how SLC25A46 gene variants are inherited is that a child typically needs to receive one altered copy of the SLC25A46 gene from each parent to be affected. When both parents carry one variant, each pregnancy has a 25% chance of an affected child, a 50% chance of a child who is a carrier, and a 25% chance of a child who inherits neither variant. Because the SLC25A46 gene is on chromosome 5, this pattern is the same for males and females.
What does my SLC25A46 result mean for my family?
For families with an SLC25A46-related condition, the usual pattern is recessive, which often means both parents are healthy carriers. Brothers and sisters may also be affected or may be carriers, even if they feel well. Other relatives on either side of the family can sometimes carry the same gene change, so the result may matter beyond just one person.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a change in the SLC25A46 gene, genetic testing looks at DNA from a blood, saliva, or cheek swab sample. SLC25A46 genetic testing can identify specific variants and may help clarify whether a variant is linked to an inherited nerve or movement condition.
When should I consider getting a genetic test?
Genetic testing for the SLC25A46 gene may be worth considering when a child or adult has unexplained nerve problems, muscle weakness, poor balance, vision loss, or delayed development, especially if similar problems run in the family. It can also help confirm an inherited cause.
A genetic result is only one part of your health story
Genetic findings can provide meaningful insight, but how much they reveal depends on the condition and the specific type of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best understood alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, these 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 is common and can help explain why the same treatment works well for one person but not as well for another, or why side effects differ from person to person.
What is Pharmacogenetics?
Pharmacogenetics focuses on how genetic differences affect a person’s response to medications. It examines links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strongly a drug works and how the body processes it. Understanding this can support treatment decisions that are more informed and more tailored to the individual. You can read more about this topic in the LearnHub.
Drugs influenced by the SLC25A46 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose. Questions about side effects, changes after starting a medicine, or how treatment fits with your overall health are best discussed with your doctor.