The CDH3 gene makes a protein that helps cells in the skin, hair follicles, and retina stay attached and organized. When the CDH3 gene does not work properly, some people are born with sparse scalp hair and later develop central vision loss from changes in the macula, the part of the eye needed for sharp sight. This gene plays an important role in tissue growth and repair. Certain variants can also affect the hands, feet, teeth, or other tissues that form early in development.
What is a gene?
Genes are stretches of DNA that give your cells instructions to make molecules or direct processes in the body. Some carry the information needed to produce proteins, which do much of the cell’s work. Others mainly regulate when certain processes happen, where they happen, and how strongly they are carried out. As a group, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. To look into this subject more closely, you can learn more in the LearnHub.
Overview
CDH3Gene function
What if the gene works
The CDH3 gene helps make P-cadherin, a protein that lets neighboring cells stick together. This supports the normal growth and organization of tissues such as hair follicles, skin, and the light sensing layer at the back of the eye.
Risk
What if the gene does not work
More disruptive variants in the CDH3 gene can cause sparse scalp hair and progressive central vision loss from childhood macular disease. Some people also have split hand or foot differences, while milder variants may lead to fewer features.
Treatment
What does that mean for your treatment
No treatment or management approach is currently tailored specifically to a pathogenic or loss-of-function variant in the CDH3 gene. Care is guided by the person’s eye, hair, and skin findings instead. In research, the CDH3 gene is being studied as a cancer biomarker and possible drug target, but this has not led to guideline-based treatment for inherited CDH3-related conditions.
Conditions associated with CDH3
Gene function
What if the gene works
Many tissues depend on the CDH3 gene to keep neighboring cells linked in an orderly way. Its protein sits at the cell surface and works like a clasp that needs calcium, helping cells hold on to each other. This steady contact supports the shape, strength, and renewal of cell layers such as the skin and other body linings.
The CDH3 gene makes a surface protein that helps nearby cells bind to each other. This attachment depends on calcium and helps cells stay connected in an organized sheet.
In skin and other body linings, this gene helps cells line up and keep a stable shape. That is part of how the CDH3 gene helps cells stick together while tissues face daily wear and renewal.
Its protein links the outer cell contact point to inner support fibers, helping cells keep their form. This gives cell layers more coordinated movement and mechanical strength.
Contact between neighboring cells also passes routine signals about position, spacing, and when to settle in place. By supporting these signals, the CDH3 gene helps tissues grow in an ordered pattern.
What is a variant?
A genetic variant is a small difference in the DNA sequence of 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 have no 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 cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the CDH3 gene often reduce or remove P-cadherin at the cell surface, so cells do not hold together as well. This is how CDH3 gene variants affect the protein: milder changes may leave some protein activity, while more disruptive variants can block protein folding, stability, or transport to the membrane. In CDH3-related hair and retinal conditions, less remaining protein activity can be linked to earlier onset or more marked features.
How variants are linked to conditions
Pathogenic variants in both copies of the CDH3 gene cause hypotrichosis with juvenile macular dystrophy, a rare inherited condition marked by sparse scalp hair and gradual loss of central vision. Variants in the CDH3 gene also cause EEM syndrome, which can include changes in hair, vision, teeth, nails, and hand or foot development. These are established CDH3-related conditions, and a confirmed diagnosis depends on finding specific pathogenic variants rather than a small shift in risk.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not have a direct effect on health and simply reflect natural variation among people. 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 factors 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?
For CDH3-related conditions, risk is driven mainly by the genetic change itself rather than lifestyle or environmental factors. Risk is higher when both parents carry a harmful CDH3 variant, and it can also be higher in families where relatives have children together. There is not enough evidence to say that diet, exercise, or other daily habits lower this genetic risk.
Inheritance of CDH3 variants
Variants in the CDH3 gene linked to known CDH3-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one altered copy of the CDH3 gene from each parent, while parents with one altered copy are typically carriers. For families looking into the CDH3 gene inheritance pattern, each pregnancy between two carriers has a 25% chance of producing a child with the condition, a 50% chance of producing a carrier child, and a 25% chance of producing a child without the variant.
What does my CDH3 result mean for my family?
For families with a disease-causing CDH3 result, close relatives may also be carriers, even if they do not have symptoms. Brothers and sisters could also be affected or carry the same gene change, so the result can be relevant beyond one person. This pattern is usually passed down in a recessive way, which often matters most for siblings and for relatives planning children.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for changes in the CDH3 gene usually uses a blood sample or cheek swab to read the gene's DNA and look for variants. This can show whether an inherited CDH3 gene variant is present and whether it is linked to the condition, unlikely to affect health, or still unclear.
When should I consider getting a genetic test?
Genetic testing for the CDH3 gene can be worth considering if someone has very sparse scalp hair from childhood and an eye condition that causes worsening central vision. It may also help when these features run in the family, or when split hand or foot differences occur along with hair and vision problems.
A genetic result is only one part of your health story
Genetic findings can be informative, but how much they reveal depends on the condition and on the kind of variant involved. Over time, many factors shape how the body works, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result can provide a clear answer. In areas like medication response, genetic results may also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. A treatment that works well for one person may work less well for another, or may cause more side effects, because the body can absorb, break down, or respond to a drug differently. These differences are common and can influence how strongly a medicine works or how sensitive someone is to it.
What is Pharmacogenetics?
Pharmacogenetics focuses on how differences in a person’s genes can affect the way they respond to medications. It examines links between genes and drugs to help explain why the same treatment may work differently in different people. With many medicines, genes influence either how strongly a drug works or how the body processes it. Understanding this can support treatment decisions that are more informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the CDH3 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how medicines work, so general health concerns or questions about side effects, new symptoms, or medication changes are best discussed with your doctor.
History
CDH3 entered medical genetics through research on the cadherin family, a group of genes studied for their role in how cells stay connected. In the late 1980s and early 1990s, scientists identified P-cadherin and then linked it to the human CDH3 gene. From these first observations, research expanded steadily. In the early 2000s, pathogenic variants in the CDH3 gene were connected with inherited conditions affecting hair growth and the retina, especially hypotrichosis with juvenile macular dystrophy. These reports helped doctors recognize that a shared genetic cause could explain a pattern of sparse hair in childhood followed by later vision changes. Over time, descriptions became more precise as additional families and variants were documented.