The TOMM70 gene helps move many proteins into mitochondria, the parts of cells that turn food into usable energy. Your body relies on this gene to keep energy production steady, especially in organs with high energy needs like the brain and muscles. If the gene does not work properly, cells may have trouble making enough energy, which can lead to a mitochondrial condition with symptoms such as developmental delay, muscle weakness, seizures, or movement problems.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes provide the directions for producing proteins, the working parts of cells. Others mainly help decide when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can read more in the LearnHub.
Overview
TOMM70Gene function
What if the gene works
The TOMM70 gene helps move many proteins into mitochondria, the parts of cells that make energy. This supports normal energy production and helps mitochondria work well in tissues with high energy needs.
Risk
What if the gene does not work
More disruptive variants in the TOMM70 gene can cause a mitochondrial condition with developmental delay, low muscle tone, and movement difficulties; some people also have seizures or hearing loss. Milder variants may lead to later onset or less pronounced features.
Treatment
What does that mean for your treatment
No TOMM70-specific treatment or management approach is currently established. Care is usually supportive and guided by a person’s symptoms, while the TOMM70 gene is also being studied in early-stage research as a marker and possible drug target in some cancers.
Gene function
What if the gene works
Your cells need the TOMM70 gene to keep mitochondria supplied with the proteins they use every day. Its protein sits on the outer surface of mitochondria and helps guide incoming proteins to the right entry point. This supports steady energy production in tissues that depend on mitochondria throughout the day.
TOMM70 helps bring newly made proteins to the surface of mitochondria. It acts as an early docking point in protein import into mitochondria, helping the right proteins reach the main entry channel.
Many proteins that move fuel building blocks and salts across the inner mitochondrial membrane first connect with TOMM70. This makes it especially useful for membrane proteins that need extra guidance on their way in.
TOMM70 works with chaperones (helper proteins that keep other proteins stable during transport) in the cell fluid. This handoff helps incoming proteins stay ready for import and reach mitochondria more smoothly.
What is a variant?
A genetic variant is a slight difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, and the way the body reacts to environmental influences. Many variants do not cause any noticeable effects and are part of natural genetic variation. Sometimes, though, a variant changes how a gene works to a greater degree and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
Variants in the TOMM70 gene can change the TOMM70 protein’s shape or reduce how much of it a cell makes. In TOMM70 gene variants, milder changes may leave some activity, while more disruptive variants can more strongly impair the movement of key proteins into mitochondria, the parts of cells that help supply energy. This range in functional effect can help explain why TOMM70-related disease may appear earlier or be more severe in some people than in others.
How variants are linked to conditions
The TOMM70 gene does not yet have a broadly confirmed link to a specific health condition, although research on TOMM70 gene variants linked to conditions is still developing. If you have a confirmed variant in the TOMM70 gene, your doctor or genetic counselor can explain what that result may mean for you and your family.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common across the general population. Most do not have a direct effect on health and simply reflect natural human variation. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes 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 is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the TOMM70 gene. If a change in TOMM70 is found on genetic testing, a doctor or genetic counselor can explain what it may mean for your personal and family risk.
Inheritance of TOMM70 variants
TOMM70-related conditions are inherited in an autosomal recessive pattern. This means a child usually needs to inherit two disease-causing variants in the TOMM70 gene, one from each parent, to be affected. Parents who each carry one variant are typically unaffected carriers. For families asking how TOMM70 variants are inherited, each pregnancy between two carriers has a 25% chance of an affected child, a 50% chance of a child who is an unaffected carrier, and a 25% chance of a child with neither variant.
What does my TOMM70 result mean for my family?
In families with a confirmed TOMM70-related condition, the result usually means parents are healthy carriers, and brothers or sisters may also be affected or may carry the same gene change without symptoms. Other close relatives can sometimes be carriers too, so the result may matter beyond one person in the family.
Genetic information
Genetic testing
How you find out about variants
TOMM70 genetic testing usually checks a blood, saliva, or cheek swab sample for changes in the TOMM70 gene. It is often done as part of a broader gene panel, exome sequencing, or genome sequencing, where a lab reads your DNA and compares it with a reference sequence. Results may identify benign, uncertain, or disease-causing variants.
When should I consider getting a genetic test?
Testing for the TOMM70 gene may be considered if a child has signs of a rare inherited mitochondrial condition, such as low muscle tone, developmental delay, seizures, or repeated episodes of serious illness with high acid levels in the blood. It can also be relevant when a close family member has a known TOMM70 change.
A genetic result is only one part of your health story
Depending on the condition and the type of variant involved, a genetic result can provide meaningful insight, but it does not always tell you the same amount. Over time, many factors, including lifestyle, environment, age, and medical history, also shape how the body works. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best considered along with 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 context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same drug may work well for one person, seem less effective for another, or cause more side effects in someone else. Part of the difference comes from how each body breaks down, transports, or responds to a medication. These inherited differences are common and can influence both treatment benefit and medicine sensitivity.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way a person responds to medications. By looking at the relationships between genes and drugs, it helps explain why the same treatment may work differently from one person to another. For many medicines, genes influence both how the body processes a drug and how strong its effects are. This information 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 TOMM70 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or adjusted. Questions about side effects, how well a treatment is working, or possible medication interactions are best discussed with your doctor.