The IGLL1 gene helps immature immune cells build an early version of the B cell receptor, a signal they need to grow into antibody-making B cells. If this gene does not work, the body may make very few or no mature B cells, so antibody levels stay very low. People with two nonworking variants can develop a form of agammaglobulinemia, with frequent infections such as ear, sinus, or lung infections starting early in life. Many other variants in this gene have little or no effect.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some provide the code for proteins, which do much of the cell’s work. Others are mainly involved in directing when certain activities happen, where they happen, and how active they are. Taken together, genes affect how your body grows and works, and they can also influence how you respond to food, stress, and medicines. More on this topic is available in the LearnHub.
Overview
IGLL1Gene function
What if the gene works
The IGLL1 gene helps early B cells, a type of immune cell, mature in the bone marrow. Its protein forms part of a temporary receptor that tests early antibody parts as B cells develop.
Risk
What if the gene does not work
Variants in the IGLL1 gene can disrupt early B cell development, leading to low antibody levels and bacterial infections, often from infancy. Milder to more severe variants may affect how early symptoms appear and how much immune function is reduced.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently tailored specifically to pathogenic variants in the IGLL1 gene. Care usually follows standard management for antibody deficiency, which can include immunoglobulin replacement and treatment of infections, rather than an IGLL1-specific approach.
Conditions associated with IGLL1
Gene function
What if the gene works
The IGLL1 gene helps your immune system build B cells, the white blood cells that later make antibodies. It is most active very early in B cell development, when these cells are still learning to recognize germs. Understanding how the IGLL1 gene helps B cells develop makes its role in normal immune system growth easier to picture.
The IGLL1 gene helps early B cells build a temporary surface receptor. This trial receptor lets the cell check that one key antibody part has been made correctly.
Through this temporary receptor, the IGLL1 gene helps send signals that guide young B cells to grow and mature. These signals support the next steps in building a working antibody making cell.
The protein made from the IGLL1 gene supports an early quality check in the bone marrow, where B cells are formed. It helps the body move forward with cells that are ready for the next stage of immune development.
What is a variant?
A genetic variant is a minor 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 do not cause any noticeable effect and simply represent natural genetic variation. Sometimes, however, a variant can affect 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 IGLL1 gene can reduce or stop production of the IGLL1 protein, or change its shape so it cannot join the early B-cell receptor, a signal young immune cells need to mature. This is how IGLL1 gene variants affect immune cell development at a cellular level. Milder variants may leave some protein activity, while more severe variants can block this pathway almost completely. In people with IGLL1-related agammaglobulinemia, that often means earlier and more marked low antibody levels.
How variants are linked to conditions
Pathogenic variants in the IGLL1 gene can cause agammaglobulinemia, a rare inherited immune condition also called agammaglobulinemia 2. People with this diagnosis usually have very low antibody levels and tend to develop repeated bacterial infections, often starting in infancy or early childhood. The link between IGLL1 gene variants and agammaglobulinemia is well established in human genetics.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely found in the general population. Most do not directly affect health and instead represent normal human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors also play a role. In some situations, though, one well-characterized variant in a specific 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 risk related to the IGLL1 gene. For families with an IGLL1-related condition, risk is mainly shaped by the inherited gene change rather than day-to-day habits, and a doctor or genetic counselor can help explain personal and family risk.
Inheritance of IGLL1 variants
IGLL1-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one IGLL1 gene variant from each parent, and parents who carry one variant typically do not have the condition themselves. In practical terms, how IGLL1 gene variants are inherited means the condition appears when both copies of the gene are affected. The IGLL1 gene is located on chromosome 22, so this inheritance pattern affects males and females similarly.
What does my IGLL1 result mean for my family?
For IGLL1, family impact is usually discussed in a recessive pattern. This often means parents are healthy carriers, and brothers or sisters may also be affected or may be carriers. Other relatives, such as future children and close family members, could also carry the variant, so the meaning for family depends on whether they inherited the same change.
Genetic information
Genetic testing
How you find out about variants
IGLL1 genetic testing uses a blood or saliva sample to look for variants in the IGLL1 gene, often as part of an immune deficiency panel or a broader exome test. This type of testing can show whether you carry one or two IGLL1 variants and can help clarify carrier status in relatives.
When should I consider getting a genetic test?
Testing for changes in the IGLL1 gene may be considered when a baby or child has repeated serious infections, very low antibody levels, or almost no B cells, the white blood cells that make antibodies. It can also help when there is a family history of an inherited immune condition.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals depends on the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best interpreted alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can also help make sense of individual experiences.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Some people break down a drug more quickly, while others process it more slowly or are more sensitive to its effects. This helps explain why the same treatment can work well for one person, have less benefit for another, or cause more side effects in someone else. These differences are common and are one part of why medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medications. It studies patterns between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strongly a drug works and how the body processes it. This information can support more informed, more individualized treatment decisions. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the IGLL1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work or which side effects they may cause. Questions about new symptoms, side effects, or changes in your treatment are best discussed with your doctor or pharmacist.