The CLDN14 gene helps make a protein that forms tight seals between neighboring cells, especially in the inner ear, where fluid balance is vital for hearing. If this gene does not work properly, the sound sensing cells can be damaged, causing hearing loss that often begins early in life. People with two pathogenic variants in the CLDN14 gene usually have nonsyndromic hearing loss, which means hearing is affected without other major body changes. Some CLDN14 variants have also been linked to kidney stone risk.
What is a gene?
Genes are sections of DNA that hold instructions cells use to make molecules or regulate processes in the body. Some genes carry the information needed to produce proteins, the parts of cells that do much of the work. Others mainly direct when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and works, and they can 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
CLDN14Gene function
What if the gene works
The CLDN14 gene makes a protein in tight junctions, the seals between neighboring cells. It is especially important in the inner ear, where it helps keep the fluid and mineral balance needed for hearing.
Risk
What if the gene does not work
Pathogenic variants in the CLDN14 gene cause inherited inner ear hearing loss, often affecting both ears from early childhood. Effects can range from milder to more severe, which may influence how early hearing changes appear and how marked they become.
Treatment
What does that mean for your treatment
No CLDN14-specific treatment or drug selection approach is currently established. Care is based on a person’s hearing needs, such as standard hearing support, rather than a treatment chosen by the CLDN14 variant itself.
Conditions associated with CLDN14
Gene function
What if the gene works
In tissues that need careful control of fluid and minerals, the CLDN14 gene helps neighboring cells stay tightly linked. Its protein forms part of the seals between cells, especially where ion balance matters for hearing. Understanding the CLDN14 gene’s function in the inner ear helps show how sound sensing cells stay in the right environment.
The CLDN14 gene helps build tight junctions, which are tiny seals between neighboring cells. These seals help tissues control what passes through the spaces between cells.
Through these cell seals, the CLDN14 gene helps regulate the movement of charged minerals such as sodium, potassium, and calcium between cells. This supports a stable fluid environment in sensitive tissues.
In the inner ear, the CLDN14 gene helps maintain the mineral balance around sound sensing cells. This steady setting supports the normal conversion of sound vibrations into nerve signals your brain can interpret.
What is a variant?
Small differences in the DNA sequence of a gene are called genetic variants. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. At times, however, a variant can change how a gene functions more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the CLDN14 gene can make the claudin-14 protein shortened, unstable, or unable to reach the seals between neighboring inner ear cells. This can disrupt fluid balance around hearing cells, which is how CLDN14 gene variants linked to hearing loss are thought to act. Milder variants may leave some protein activity, while more severe variants often leave little or none and may be tied to earlier or more marked hearing loss.
How variants are linked to conditions
Pathogenic variants in the CLDN14 gene cause an inherited form of hearing loss, often called DFNB29. In this well-established CLDN14 gene hearing loss association, people with two disease-causing variants usually have hearing loss without other body systems being affected. Some common CLDN14 gene variants have also been linked to a higher chance of kidney stones in population studies, but that reflects risk rather than a diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are a common and normal part of being human. Most do not directly affect health and instead reflect natural differences among people. For many genes, carrying a variant associated with a condition points to a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors also play a role. In some situations, though, a single well understood variant in a specific gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For CLDN14-related hearing loss, risk is mainly shaped by genetics rather than lifestyle. Hearing loss usually happens when a child inherits harmful changes in both copies of the CLDN14 gene, so family history and whether both parents carry a change matter most. There is not enough evidence to say that diet, exercise, or other daily habits lower this inherited risk.
Inheritance of CLDN14 variants
Variants in the CLDN14 gene are inherited in an autosomal recessive pattern. This means a child usually inherits one changed copy from each parent, and parents who each carry one CLDN14 variant are typically unaffected carriers. When both parents are carriers, each pregnancy has a 25% chance of a child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. In practical terms, the CLDN14 inheritance pattern often appears in families only when both sides pass on the same gene change.
What does my CLDN14 result mean for my family?
For CLDN14, the main family pattern is recessive, which means relatives may be healthy carriers without knowing it. Brothers and sisters of someone with a disease-causing CLDN14 result may have a higher chance of also having the same hearing-related condition or being carriers. Parents are often carriers, and other close relatives may want to learn whether carrier testing is relevant for their branch of the family.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the CLDN14 gene, a lab can do genetic testing for hearing loss linked to the CLDN14 gene using a blood or saliva sample. The test reads your DNA to look for changes in this gene. Results can help confirm a genetic cause of hearing loss or show carrier status in a family.
When should I consider getting a genetic test?
Consider genetic testing that includes the CLDN14 gene if there is hearing loss from birth or early childhood, especially when it runs in the family. Finding a change in CLDN14 can help explain the cause of inherited hearing loss and may clarify what it means for relatives.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals varies by the condition and the kind of variant involved. How the body functions over time is also shaped by many factors, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most helpful when viewed together with other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as response to medication, 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, while others are more or less sensitive to its effects. This helps explain why the same treatment can work well for one person but cause fewer benefits or more side effects in another. These differences are common and are one reason medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that focuses on how genetic differences affect a person’s response to medicines. It examines the relationship between genes and drugs to help explain why treatments do not work the same way for everyone. For many medications, genes can influence how strongly a drug acts or how the body processes it. This information can support treatment decisions that are more informed and more individualized. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the CLDN14 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine choice or response, so any concerns about side effects, new symptoms, or how a treatment is working are best discussed with your doctor.
History
CLDN14 entered the scientific literature after the claudin family of cell junction genes was identified in the late 1990s. From these first observations, research expanded steadily. In the mid 2000s, variants in the CLDN14 gene were linked to an inherited form of hearing loss, which gave the gene clearer clinical importance. Later studies connected common variants near the CLDN14 gene with a higher chance of kidney stones, broadening interest beyond rare inherited hearing conditions. Over time, scientists’ understanding of the gene’s role has changed, moving from basic discovery to a better picture of how CLDN14 can be relevant in both rare and more common health problems.