The TOMT gene helps tiny sensory cells in the inner ear work properly. This gene plays an important role in helping those cells turn sound vibrations into signals for the brain. If the TOMT gene is not working as it should, a person may have inherited hearing loss that is often present from birth and usually happens without other major health effects. People with pathogenic variants in both copies of the TOMT gene most often have hearing loss limited to the ear.
What is a gene?
A gene is a section of DNA that carries instructions your cells use to make molecules or to regulate processes in the body. Some genes provide the directions for producing proteins, which are the parts of cells that do the work. Others mainly guide when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, and medications. For a more detailed look at this topic, you can find additional information in the LearnHub.
Overview
TOMTGene function
What if the gene works
The TOMT gene helps inner ear hair cells work normally. Its protein supports the machinery that turns sound vibrations into nerve signals for hearing.
Risk
What if the gene does not work
Variants in the TOMT gene can cause early sensorineural hearing loss, often present from birth or early childhood. Effects may range from milder to more severe, which can influence when hearing changes appear and how much hearing is affected.
Treatment
What does that mean for your treatment
For pathogenic or loss-of-function variants in the TOMT gene, no TOMT-specific treatment or drug choice is currently established in clinical guidelines; management is based on the person’s hearing needs rather than on the TOMT gene itself.
Gene function
What if the gene works
In the inner ear, the TOMT gene helps tiny sound sensing cells do their everyday work. Its protein is mainly involved in setting up the machinery that lets these cells respond to movement caused by sound waves. Understanding how the TOMT gene works can make it easier to see how the ear turns vibration into signals the brain can use.
Inside inner ear hair cells, the TOMT gene helps key hearing proteins reach the right place in the cell. This careful protein targeting supports the tiny structures that detect movement caused by sound.
The TOMT gene supports the machinery that changes vibration into electrical signals your brain can read as sound. This is a central step in how the inner ear turns sound waves into nerve signals.
What is a variant?
Genetic variants are small differences in the DNA sequence of a gene. They are common and help shape normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many have no noticeable effect and simply represent natural genetic variation. Sometimes, though, a variant changes how a gene works more substantially and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the TOMT gene can change the protein’s shape, lower its stability, or sharply reduce how much of it a cell makes. In practical terms, how variants influence the TOMT gene’s function depends on the change: some missense variants may leave partial activity, while more disruptive variants can lead to little or no working protein. At the cellular level, this can disrupt key protein interactions in inner ear hair cells, and more severe loss of function is linked to earlier or more marked hearing loss.
How variants are linked to conditions
Pathogenic variants in both copies of the TOMT gene cause a form of inherited hearing loss called DFNB63. In many families, TOMT gene hearing loss begins before a child starts speaking and is usually permanent sensorineural hearing loss. This condition is generally limited to hearing and is not usually linked to a broader syndrome.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of being human and are widely seen across the general population. Most do not directly affect health and simply reflect normal human diversity. 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 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?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the TOMT gene. For many living with TOMT changes, risk depends mainly on the exact gene change inherited in the family, and a doctor or genetic counselor can help explain what that may mean personally.
Inheritance of TOMT variants
TOMT gene inheritance follows an autosomal recessive pattern for the hearing loss linked to this gene. This means a child usually inherits one TOMT variant from each parent. Parents who each carry one variant typically do not have hearing loss themselves, but with each pregnancy there is a 25% chance the child inherits both variants and is affected, a 50% chance the child is a carrier, and a 25% chance the child inherits neither variant. Sons and daughters are affected at the same rate.
What does my TOMT result mean for my family?
Changes in the TOMT gene are linked to an inherited form of hearing loss that usually runs in families in a recessive pattern. For family members, this often means brothers and sisters could also have hearing loss or be carriers, even if parents do not have symptoms. Close relatives may want to learn whether the same gene change is present, especially if there is a family history of childhood hearing loss.
Genetic information
Genetic testing
How you find out about variants
To look for variants in the TOMT gene, a lab usually analyzes DNA from a blood or saliva sample. Genetic testing for TOMT variants reads the gene's code to look for changes that may help explain inherited hearing loss or show whether someone carries a family variant.
When should I consider getting a genetic test?
Consider TOMT genetic testing if there is hearing loss present from birth or early childhood, especially when it runs in the family. A test may help explain the cause of inherited hearing loss and clarify whether other relatives could also carry the gene change.
A genetic result is only one part of your health story
A genetic finding may provide useful information, but what it can tell you varies with the condition and the kind of variant. Over time, the way the body functions is shaped by many factors, including lifestyle, environment, age, and medical history. For some conditions, particularly those affected by many genes, genetic information offers context rather than certainty and is most useful when considered with other parts of care. In other situations, a genetic result can give a clear answer. For medication response, it can also help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Small inherited differences can change how a drug is absorbed, broken down, moved through the body, or how strongly it acts at its target. This helps explain why the same medication may work well for one person, seem weaker for another, or cause more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics studies how genetic differences affect the way people respond to medications. It examines gene and drug patterns to better explain 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 help support treatment decisions that are more informed and more individualized. You can read more about this topic in the LearnHub.
Drugs influenced by the TOMT gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dosing, so any health concerns or medicine side effects are best discussed with your doctor.