The SLC25A40 gene gives your cells instructions for a transporter in mitochondria, the parts of cells that make energy. This gene plays an important role in helping mitochondria move key molecules across their inner membrane so cells can make and manage energy. If the SLC25A40 gene does not work properly, cells may struggle to meet energy needs, which can lead to a rare mitochondrial condition with muscle weakness, low stamina, growth or developmental concerns, and changes in blood lactate. Most people only hear about this gene when genetic testing is done for symptoms linked to problems with energy production.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells can use to make molecules or regulate processes in the body. Some genes hold the directions for producing proteins, the functional parts of cells. Other genes mainly help decide when certain processes take place, where they happen, and how strongly they run. Taken together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can learn more in the LearnHub.
Overview
SLC25A40Gene function
What if the gene works
The SLC25A40 gene makes a carrier protein in mitochondria, the parts of cells that make energy. It helps move needed substances across the inner mitochondrial membrane and supports normal energy production.
Risk
What if the gene does not work
Milder to more severe variants in the SLC25A40 gene can reduce the activity of a mitochondrial transporter, which may disrupt the movement of small molecules across the inner mitochondrial membrane. This can interfere with normal energy-related cell processes.
Treatment
What does that mean for your treatment
At present, no treatment or drug choice approach specific to the SLC25A40 gene is established for people with a pathogenic or loss of function variant.
Gene function
What if the gene works
Your cells need healthy mitochondria to make and manage energy every day. The SLC25A40 gene helps build a transport protein in the mitochondria’s inner membrane. One of its main jobs is to move glutathione, a natural protective molecule, into these energy making structures. This is part of how the SLC25A40 gene supports energy production in the body.
The SLC25A40 gene helps move glutathione, a natural antioxidant, into mitochondria. This gives these energy making parts of the cell an important tool for normal daily activity.
Inside mitochondria, glutathione helps control oxidative stress (chemical strain from normal energy production). By supplying this molecule, SLC25A40 supports a steadier internal environment for routine cell function.
When mitochondria have the right molecules in the right place, they can carry out energy related steps more smoothly. SLC25A40 is part of that transport system, helping many cells meet everyday energy demands.
What is a variant?
A genetic variant is a small difference in the DNA sequence of 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 lead to any noticeable effect and simply represent natural genetic variation. Sometimes, however, a variant can change the function of a gene more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the SLC25A40 gene can alter the carrier protein’s shape, stability, or placement in the mitochondrial membrane, which may reduce its activity inside the cell. This is how SLC25A40 gene variants affect protein function at the cellular level. Milder variants may only partly lower activity, while more severe loss-of-function variants can leave the protein unstable, mislocalized, or largely inactive.
How variants are linked to conditions
Current evidence on how variants in the SLC25A40 gene are linked to conditions is still developing, and this gene does not yet have a broadly confirmed connection to a specific health condition. Anyone with a confirmed SLC25A40-related diagnosis should rely on guidance from their doctor or genetic counselor rather than general information.
A variant is not necessarily a diagnosis
Genetic variants are a usual feature of human biology and are widely seen across the population. Most do not directly affect health and instead represent normal human diversity. For many genes, having a variant associated with a condition points to a potential link, not a certain diagnosis, particularly 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 the 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 risks related to the SLC25A40 gene. Anyone concerned about their personal or family risk can talk with a doctor or genetic counselor for advice based on their own health history.
Inheritance of SLC25A40 variants
There is not yet a broadly confirmed Mendelian pattern for how SLC25A40-related health findings are passed down in families, so SLC25A40 gene inheritance is still being clarified as research develops. The SLC25A40 gene is located on chromosome 13, which is an autosome, so you inherit one copy of this gene from your mother and one copy from your father.
What does my SLC25A40 result mean for my family?
There isn't yet a broadly confirmed inheritance pattern tied to a specific condition for the SLC25A40 gene, though this understanding can change as research develops. If you have a specific SLC25A40 result and questions about what it could mean for your family, a doctor or genetic counselor can help explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the SLC25A40 gene, doctors use genetic testing for SLC25A40 variants, usually with a blood or saliva sample. A lab reads the gene’s DNA sequence and checks whether any variant is known to be disease causing, likely harmless, or still unclear.
When should I consider getting a genetic test?
There isn't yet a broadly established, SLC25A40-specific clinical reason for testing. Decisions about genetic testing are usually based on your personal health history, symptoms, and family history, and are best made with a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they reveal depends on the condition and the kind of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also shape how the body functions over time. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best interpreted alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can also help put individual experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. A treatment that works well for one person may work less well for another, or may cause more side effects, because the body can absorb, break down, transport, or respond to drugs in different ways. These inherited differences are common and can influence both how strongly a medicine works and how sensitive someone is to it.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way people respond to medications. It studies the relationship 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 how strongly a drug works or how the body handles it. This information can help support treatment decisions that are more informed and more individualized. To explore this topic in greater detail, you can learn more in the LearnHub.
Drugs influenced by the SLC25A40 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response, so general health concerns, new symptoms, or questions about side effects are best discussed with your doctor.