This gene helps nerve cells send steady electrical signals, especially in the cerebellum, the brain area that fine-tunes balance and movement. If the FGF14 gene does not work properly, signaling can become less controlled, which may lead to unsteady walking, tremor, eye movement problems, or slurred speech. Some people also have episodes that worsen with fever, alcohol, or physical stress. Certain variants in the FGF14 gene are linked to inherited ataxia, a condition that affects balance and coordination.
What is a gene?
A gene is a stretch of DNA that gives your cells instructions for making molecules or directing processes in the body. Some genes carry the directions for producing proteins, the parts of cells that do much of the work. Other genes mainly regulate when, where, and how strongly certain processes take place. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. To explore this topic in more detail, you can learn more in the LearnHub.
Overview
FGF14Gene function
What if the gene works
In the brain, the FGF14 gene helps nerve cells send electrical signals in a steady way. This supports balance, coordination, movement, and some aspects of learning and memory.
Risk
What if the gene does not work
Variants in the FGF14 gene can affect brain signaling and are linked to balance and coordination problems, often with tremor or nystagmus. Milder to more severe variants may range from later-onset ataxia to childhood developmental delay, with or without seizures.
Treatment
What does that mean for your treatment
A pathogenic or loss-of-function variant in the FGF14 gene does not currently point to an established FGF14-specific treatment or drug choice in clinical guidelines. Care is usually based on a person’s symptoms rather than on the FGF14 result itself. The FGF14 gene is being studied in early research because it helps control how nerve cells fire, which may support future targeted treatments.
Conditions associated with FGF14
Gene function
What if the gene works
The FGF14 gene helps brain cells send clear, well timed messages. Its protein stays inside nerve cells and supports the protein gates that start electrical signals. This is a central part of how the FGF14 gene works in the brain, especially in networks used for coordination and learning.
The FGF14 gene helps nerve cells control when they fire electrical signals. It works closely with sodium channels, the protein gates that start each signal, so messages travel with steady timing.
One role of the FGF14 gene is helping key channels reach and stay in the right part of the nerve cell. This keeps the signal starting zone organized so the cell can send messages smoothly.
Its activity is especially important in brain networks used for balance, coordination, and learning. By supporting precise nerve cell firing, it helps these circuits communicate in an orderly way.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, or how 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 can change how a gene functions more substantially and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
Changes in the FGF14 gene can affect nerve cell signaling by making too little FGF14 protein, producing an unstable protein, or weakening its interaction with sodium channels that help control electrical activity. Some variants, including GAA repeat expansions, mainly reduce how much protein is made, while others more directly disrupt the protein itself. Milder variants may leave some function intact, while more disruptive variants can reduce function further and are often linked to earlier or more noticeable problems with balance, coordination, or brief episodes of symptoms.
How variants are linked to conditions
Pathogenic variants in the FGF14 gene can cause inherited cerebellar ataxia, which often affects balance, coordination, speech, and eye movements. Well-established links between variants in the FGF14 gene and health conditions include spinocerebellar ataxia type 27 (SCA27) and FGF14-related GAA repeat ataxia, also called SCA27B, which often begins in adulthood and may include dizziness or episodes of unsteady walking. These are genetic diagnoses confirmed by pathogenic variants, not just small changes in risk.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a usual part of human biology. Most do not directly affect health and simply reflect natural variation among people. For many genes, a variant tied to a condition points to a possible association rather than a certain diagnosis, particularly when several genes and environmental influences contribute. In some situations, though, one well-studied 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 FGF14 gene. For many living with an FGF14 change, risk is shaped mainly by the exact gene change itself and family history, and a doctor or genetic counselor can help explain personal risk.
Inheritance of FGF14 variants
FGF14-related conditions are most often inherited in an autosomal dominant pattern, which means one altered copy of the FGF14 gene can be enough to cause disease. In practical terms, how FGF14 gene variants are inherited usually means a parent carrying the variant has a 50% chance of passing it on to each child. Sons and daughters are affected equally because the FGF14 gene is on chromosome 13, not a sex chromosome. In some families, the variant is inherited across several generations.
What does my FGF14 result mean for my family?
For FGF14, a disease-causing result is usually linked to a condition that can run in families in a dominant way, so close relatives such as parents, brothers, sisters, and children may also carry the same change. Some family members may have balance problems, shaky movements, or episodes of symptoms, while others have milder signs. Because of this, relatives may want to talk with their doctor or a genetic counselor about whether testing makes sense for them.
Genetic information
Genetic testing
How you find out about variants
FGF14 genetic testing looks for variants in the FGF14 gene using a blood sample or saliva sample. A lab reads the gene’s DNA sequence and compares it with the usual version, which can help confirm whether a variant is present and whether it may explain a person’s symptoms or family history.
When should I consider getting a genetic test?
Consider genetic testing for the FGF14 gene if you or close relatives have unexplained balance and coordination problems, repeated dizzy spells, shaky movements, or trouble walking that runs in the family. Testing can help confirm an inherited ataxia, a condition that affects balance and movement, especially when symptoms start in adulthood.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but the amount it reveals depends on the condition and on the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, affect how the body functions. For some conditions, particularly those shaped by many genes, genetic information offers context rather than certainty and makes the most sense when viewed with other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic findings can help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same treatment works well for one person, has little effect in another, or causes more side effects in someone else. These differences are common and are one of several reasons medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences shape the way people respond to medications. It focuses on links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes affect both how strongly a drug works and how the body processes it. This understanding 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 FGF14 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose, so any questions about medicines, side effects, or changes in how treatment feels are best discussed with your doctor.