The ITGB2 gene gives instructions for part of a protein on white blood cells that helps them stick to blood vessel walls and move into tissues to fight infection. This gene helps your body mount a more controlled immune response where it is needed. If it does not work well, white blood cells may stay in the bloodstream instead of reaching wounds or infected areas, which can lead to repeated infections, slow healing, and delayed separation of the umbilical cord after birth. Pathogenic variants in the ITGB2 gene are best known for causing leukocyte adhesion deficiency type 1, a rare inherited immune condition.
What is a gene?
A gene is a section of DNA that carries instructions your cells use to make molecules or regulate processes in the body. Some genes hold the instructions for building proteins, the parts of cells that do the work. Others mainly help determine when certain processes happen, where they happen, and how strongly they occur. Together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can read more in the LearnHub.
Overview
ITGB2Gene function
What if the gene works
The ITGB2 gene helps white blood cells stick to blood vessel walls and move into tissues. This supports fighting infections and healing after injury. It also helps immune cells communicate and attach to other cells.
Risk
What if the gene does not work
When the ITGB2 gene does not work properly, white blood cells cannot leave the bloodstream normally. More severe variants often lead to repeated infections and poor wound healing, while milder variants may cause later, less severe symptoms.
Treatment
What does that mean for your treatment
For marked loss of function in the ITGB2 gene, hematopoietic stem cell transplantation is the established disease directed treatment and can restore immune cell function. People with milder variants are often managed with careful infection prevention, prompt antibiotics, and close dental and skin care.
Conditions associated with ITGB2
Gene function
What if the gene works
In daily immune defense, the ITGB2 gene helps white blood cells travel, attach, and communicate where they are needed. Its protein sits on the cell surface and pairs with partner proteins to form grips used by immune cells. This helps white blood cells move from the bloodstream into tissues and interact with germs and other immune cells.
The ITGB2 gene helps white blood cells stick to blood vessel walls and to other cells when a firm hold is needed. Its protein acts as part of a surface grip, helping immune cells stop at the right place instead of drifting past.
These surface grips help white blood cells flatten, crawl, and pass out of the bloodstream into nearby tissue. That is a basic part of how white blood cells move to areas where the body is responding to infection or injury.
In some immune cells, the ITGB2 gene helps build receptors that recognize germs or debris that have been tagged for cleanup. This supports engulfing and clearing material that the body wants removed.
The ITGB2 gene also supports close contact between immune cells so they can exchange signals more effectively. These contacts help cells change shape, organize their surface proteins, and coordinate a measured immune response.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and are part of normal human diversity, such as differences in appearance, metabolism, or how the body responds to environmental influences. Many variants have no noticeable effect and simply represent natural genetic variation. In some situations, however, a variant can change how a gene functions more substantially and may contribute to, or sometimes cause, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the ITGB2 gene can alter the β2 integrin protein, an immune cell surface protein, so it folds poorly, does not reach the cell surface, or binds partner proteins weakly. Understanding how ITGB2 gene variants affect protein function helps explain why some changes leave partial activity, while more severe variants leave little or no working protein. In leukocyte adhesion deficiency type 1, this can influence how early symptoms appear and how severe they are.
How variants are linked to conditions
Pathogenic variants in both copies of the ITGB2 gene cause leukocyte adhesion deficiency type 1, a rare inherited immune condition. This ITGB2 gene link to leukocyte adhesion deficiency type 1 is well established in human genetics. People with this diagnosis often have repeated bacterial infections, poor wound healing, and little or no pus at infected sites.
A variant is not necessarily a diagnosis
Variants in genes are a routine and common feature of human biology. Most do not directly affect health and instead represent part of normal human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a confirmed diagnosis, particularly when several genes and environmental influences also play a role. In other situations, though, one well-characterized variant in a particular gene is enough to confirm the diagnosis.
Are there things that can increase or change my risk?
For ITGB2, risk is driven mainly by inheritance: a child is affected when harmful changes are passed down in both copies of the gene, so family history and both parents being carriers raise the chance. There is not enough evidence to say lifestyle changes lower the chance of developing the condition.
Inheritance of ITGB2 variants
ITGB2-related conditions are inherited in an autosomal recessive pattern. This means a person usually develops the condition only when they inherit two disease-causing variants in the ITGB2 gene, one from each parent. Parents who each carry one variant are typically unaffected carriers, and with each pregnancy they have a 25% chance of having an affected child, a 50% chance of having a carrier child, and a 25% chance of having a child without either variant. In families asking how ITGB2 gene variants are inherited, this pattern means sons and daughters are affected equally.
What does my ITGB2 result mean for my family?
For families, an ITGB2 result usually matters most for brothers, sisters, and future children because this gene is linked to a recessive immune condition called leukocyte adhesion deficiency type 1. Parents of an affected child are often healthy carriers, and brothers or sisters may also be carriers or, less often, have the condition. Other relatives may carry the same gene change too, especially on the side of the family it was passed through.
Genetic information
Genetic testing
How you find out about variants
Genetic testing of the ITGB2 gene uses a blood or saliva sample to read the gene’s DNA and look for variants linked to leukocyte adhesion deficiency type 1. It can help confirm a diagnosis in someone with suggestive symptoms or show whether a family member carries the same variant.
When should I consider getting a genetic test?
Consider ITGB2 testing if a baby or child has repeated serious bacterial infections, delayed umbilical cord separation, poor wound healing, or little pus despite infection. Testing can also help when this immune condition, called leukocyte adhesion deficiency type 1, runs in the family or when carrier testing is being considered.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it reveals depends on the condition and the specific type of variant involved. Lifestyle, environment, age, and medical history, among other factors, 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 best considered together with other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, genetic results can also help put personal experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can influence how your body responds to medicines, so the same treatment may work differently from one person to another. Some people process a drug faster or slower, while others are more or less sensitive to its effects. These common differences can affect how well a medicine works or how likely side effects are. Medication response is also shaped by other factors, including age, liver and kidney function, and other medicines you take.
What is Pharmacogenetics?
Pharmacogenetics looks at how genetic differences shape a person’s response to medications. It studies gene and drug patterns to help explain why the same treatment may work differently from one person to another. For many medicines, genes affect how strongly a drug works or how the body processes it. This information can support more informed, individualized treatment decisions. If you want to read more about this topic, more information is available in the LearnHub.
Drugs influenced by the ITGB2 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or used, so any questions about side effects, medicine safety, or how well a treatment is working are best discussed with your doctor.
History
The ITGB2 gene entered medical history through the study of children with repeated bacterial infections, poor wound healing, and little pus at infection sites, a pattern now known as leukocyte adhesion deficiency type 1. In the 1980s, researchers linked these features to a missing or reduced surface protein called CD18 on white blood cells. Building on this early work, scientists uncovered that the ITGB2 gene provides the instructions for that protein, which helped confirm the genetic basis of the condition. This discovery became an important step in immunology because it connected a clear clinical pattern with a specific inherited gene change. Over time, descriptions became more precise as laboratory testing and genetic sequencing improved.