The SH3PXD2B gene helps cells move, attach, and shape tissues as the body develops. If it does not work properly, growth of connective tissue, bones, eyes, and the heart can be affected. Certain variants in this gene cause Frank-Ter Haar syndrome, a rare inherited condition that can include distinctive facial features, short stature, eye problems, and heart changes. Many variants are harmless, while a few may change how the gene supports normal development.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or regulate activities in the body. Some genes provide the information needed to produce proteins, the working parts of cells. Others mainly help direct when certain processes happen, where they take place, and how strongly they are carried out. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can learn more in the LearnHub.
Overview
SH3PXD2BGene function
What if the gene works
The SH3PXD2B gene helps cells form small surface structures used for movement and tissue shaping. Its protein supports cell signaling. It also helps build connective tissue, bones, and parts of the eyes during development.
Risk
What if the gene does not work
More disruptive variants in the SH3PXD2B gene can cause Frank-Ter Haar syndrome, a condition affecting bone growth, the eyes, heart, and facial development. Milder variants may lead to a wider range in when features appear and how marked they are.
Treatment
What does that mean for your treatment
No SH3PXD2B-specific treatment or drug selection approach is currently established in clinical guidelines; care is based on a person’s symptoms and the organs affected rather than the variant itself. The SH3PXD2B gene is being studied in early cancer research because changes in its activity may influence how cells move and spread, but this has not led to routine treatments.
Conditions associated with SH3PXD2B
Gene function
What if the gene works
Your cells use SH3PXD2B to organize movement and shape at their outer surface. This matters when cells need to attach, shift position, and interact with nearby tissue. The protein from this gene works mainly as a helper platform, bringing other proteins together in the right place. That coordination is central to what the SH3PXD2B gene does in the body each day.
SH3PXD2B acts as a scaffold, meaning it brings several proteins together in one spot. This helps signals at the cell surface connect to the systems that control movement and shape.
SH3PXD2B helps cells build inner support structures that allow steady, controlled movement. This lets cells explore nearby tissue and shift into the right place during growth and routine repair.
Its protein helps form small surface extensions that cells use to attach and move. These structures give cells a practical way to grip nearby material and adjust their shape when needed.
SH3PXD2B helps cells make organized contact points with the support material around them. This supports normal tissue shaping and everyday upkeep in many parts of the body.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences 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. In some cases, though, a variant can change how a gene functions to a greater extent and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Many variants in the SH3PXD2B gene reduce the amount or stability of the TKS4 protein, or alter its shape so it cannot bind well to partner proteins. This is how SH3PXD2B gene variants affect protein function: they disrupt tiny cell structures used for cell movement and tissue remodeling. More disruptive variants may leave little or no working protein, while milder variants may keep some activity and can be linked to earlier or broader features of Frank-Ter Haar syndrome.
How variants are linked to conditions
Biallelic pathogenic variants in the SH3PXD2B gene cause Frank-Ter Haar syndrome, a rare inherited condition. This diagnosis can involve short stature, distinctive facial features, eye problems such as glaucoma, hearing loss, and heart or skeletal changes. People who carry one altered copy are usually unaffected. In current medical genetics, SH3PXD2B gene variants linked to conditions are most clearly tied to Frank-Ter Haar syndrome.
A variant is not necessarily a diagnosis
Genetic variants are a normal feature of human biology and are common in the general population. Most have no direct impact 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 multiple genes and environmental factors are involved. In some cases, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For SH3PXD2B, risk is mainly set by inheritance rather than lifestyle. A child is affected when they inherit two nonworking copies of the SH3PXD2B gene, so risk is higher when both parents carry a harmful variant, especially in families with a known history or with related parents. There is not enough evidence that diet, exercise, or everyday habits change this genetic risk.
Inheritance of SH3PXD2B variants
Variants in the SH3PXD2B gene linked to known SH3PXD2B-related conditions are inherited in an autosomal recessive pattern. This means a child usually needs to inherit one altered copy from each parent to have the condition, while parents with one altered copy are typically carriers. When both parents carry a SH3PXD2B gene variant, each pregnancy has a 25% chance of the child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. Because SH3PXD2B is on an autosome rather than a sex chromosome, this pattern affects males and females equally.
What does my SH3PXD2B result mean for my family?
Changes in the SH3PXD2B gene are linked to a rare inherited condition that usually runs in families in a recessive pattern. For relatives, this often means parents may be healthy carriers, and brothers or sisters could also be affected or be carriers even if they seem well. Other close family members may also carry the gene change, especially on the same side of the family.
Genetic information
Genetic testing
How you find out about variants
SH3PXD2B genetic testing looks for variants in the SH3PXD2B gene using a blood sample, saliva, or a cheek swab. A lab reads the gene’s DNA sequence and compares it with the usual sequence to see whether a variant is present, which can help confirm a suspected inherited condition.
When should I consider getting a genetic test?
Genetic testing for SH3PXD2B may be considered when a child has signs of Frank-ter Haar syndrome, such as unusual bone or facial features, eye problems, or heart concerns, or when this condition runs in the family. It can help confirm the cause and clarify chances for future children.
A genetic result is only one part of your health story
Genetic results can be informative, but how much they reveal varies with the condition and the kind of variant involved. Over time, the way the body works is also shaped by many factors, 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 may give a clear answer. In areas like medication response, these results can help put individual experiences into 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 medication may work well for one person, work less well for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines the way genetic differences affect how people respond to medicines. By studying links between genes and drugs, it helps explain why the same treatment can work differently from one person to another. For many medicines, genes influence both how the body handles a drug and how strong its effects are. This information can support more personalized and well informed treatment choices. More detail on this topic is available in the LearnHub.
Drugs influenced by the SH3PXD2B 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 questions about side effects, treatment changes, or new symptoms are best discussed with your doctor or pharmacist.