The TBC1D24 gene helps nerve cells send signals and supports the tiny packets that release messages between cells. If it does not work properly, brain signaling can become unstable, which may lead to seizures, hearing loss, or delays in development and movement. Some people with pathogenic variants in this gene have a condition called DOORS syndrome, while others have epilepsy without the full syndrome. This gene plays an important role in how the brain and inner ear work from early life onward.
What is a gene?
Genes are pieces of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes hold the information needed to make proteins, the parts of cells that do the work. Other genes mainly direct when certain processes happen, where they happen, and how strongly they run. Taken together, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. For a more detailed look at this topic, you can learn more in the LearnHub.
Overview
TBC1D24Gene function
What if the gene works
The TBC1D24 gene helps nerve cells communicate by supporting the movement and recycling of tiny signal packets at their connections. It also supports healthy function of some cells in the brain and inner ear.
Risk
What if the gene does not work
Variants in the TBC1D24 gene can cause epilepsy and developmental differences, and some are linked to hearing loss or DOORS syndrome. Effects can range from milder to more severe, which may influence when symptoms begin and which features appear.
Treatment
What does that mean for your treatment
No treatment or drug selection approach specific to the TBC1D24 gene is currently established. Care is guided by the person's symptoms, with standard treatments used for seizures, hearing needs, and developmental support rather than the specific variant.
Conditions associated with TBC1D24
Gene function
What if the gene works
Tiny, fast moving tasks happen constantly inside nerve cells. The TBC1D24 gene helps manage these tasks by guiding small membrane packets and supporting signal release at connections between cells. It also helps cells cope with routine chemical stress, which supports steady day to day brain function.
The TBC1D24 gene helps move and recycle tiny membrane sacs that carry cell cargo. In nerve cells, this keeps important materials in the right place and ready for use.
One of the main ways the TBC1D24 gene helps nerve cells communicate is by supporting signal release. It helps keep signal packets available at synapses, the contact points where one nerve cell passes a message to the next.
The protein made from the TBC1D24 gene also helps cells respond to oxidative stress (a buildup of reactive oxygen molecules). This protective role can help nerve cells stay stable during normal metabolic activity.
What is a variant?
A genetic variant is a minor difference in a gene’s DNA sequence. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant changes how a gene works more significantly and may contribute to, or directly cause, a genetic condition.
Genetic variants
What if the gene does not work
Many variants in the TBC1D24 gene change the protein’s shape, stability, or ability to interact with cell membranes and partner proteins, leaving cells with less working protein. Some variants still allow partial activity, while more severe variants can greatly reduce or nearly abolish it. This range in functional impact helps explain how TBC1D24 gene variants affect protein function and why some people have isolated hearing loss, while others develop earlier-onset epilepsy or broader features such as DOORS syndrome.
How variants are linked to conditions
Pathogenic variants in the TBC1D24 gene can cause several inherited conditions, most often forms of epilepsy, hearing loss, and a rare condition called DOORS syndrome, which can include developmental delay and changes in the nails or bones. In medical genetics, TBC1D24 gene variants linked to epilepsy and hearing loss are a well-established finding. The exact features can vary widely from one person or family to another.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely seen in the general population. Most do not have a direct effect on health and simply reflect natural human diversity. 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 contribute. In some situations, though, a single well-characterized variant in a specific 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 lifestyle or environmental factors that increase or reduce health risks linked to TBC1D24. In families with a TBC1D24-related condition, risk is usually shaped more by the specific gene change that is inherited than by day-to-day habits.
Inheritance of TBC1D24 variants
The inheritance of the TBC1D24 gene variants depends on the specific condition involved. Well-established TBC1D24-related conditions can be inherited in either an autosomal recessive or autosomal dominant pattern. In autosomal recessive inheritance, a child inherits one variant from each parent, and parents are usually unaffected carriers. In autosomal dominant inheritance, one altered copy can be enough to cause the condition, so an affected parent can pass it to a child with a 50% chance in each pregnancy.
What does my TBC1D24 result mean for my family?
TBC1D24 results can have different meanings for family members because this gene is linked to more than one inherited condition. In some families, a changed copy can be passed down and may affect close relatives, so parents, siblings, and children may also carry the same change. In other families, the condition appears only when a child inherits a changed copy from both parents, which means relatives may be healthy carriers. The family impact depends on the exact TBC1D24 result and the condition involved.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for TBC1D24 variants usually uses a blood or saliva sample to read the TBC1D24 gene. It may be done as part of an epilepsy, hearing loss, or broader inherited condition panel, or through exome sequencing. Results can show a harmful variant, a benign variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Testing for the TBC1D24 gene may be worth considering when someone has unexplained seizures that start early in life, especially along with hearing loss, developmental delay, or unusual nails or bone changes. It can also help when these problems seem to run in the family.
A genetic result is only one part of your health story
A genetic result may provide useful insight, but how much it can explain varies based on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, also shape how the body functions over time. In some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most helpful when viewed alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like 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. Some people break down a drug more slowly or more quickly than others, which can change how much of the medicine reaches the body and brain. This common difference can influence how well a treatment works or how likely someone is to notice side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect the way someone responds to medication. It focuses on gene and drug patterns to help explain why the same treatment can work differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body handles it. Understanding this can support treatment decisions that are both more informed and more individualized. If you want to explore this subject further, you can learn more in the LearnHub.
Drugs influenced by the TBC1D24 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work, so questions about treatment, side effects, or new symptoms are best discussed with your doctor.
History
In recent decades, awareness of the TBC1D24 gene’s role has grown through research on rare inherited epilepsy and hearing conditions. Variants in the TBC1D24 gene were first linked to familial infantile myoclonic epilepsy, a finding that helped connect a shared family pattern to a specific gene. From these first observations, research expanded steadily, and doctors later recognized that changes in this gene could also be tied to a broader range of neurologic and hearing-related conditions. Scientific classifications changed as researchers learned more about the gene, especially because different variants can be linked to different clinical pictures. This history reflects a familiar path in genetics: a gene first identified in one family pattern later becomes part of a wider understanding of inherited health conditions.