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Agammaglobulinemia (AGMX) is an inherited immune system disorder. Passed from parent to child, it’s also known as Bruton’s agammaglobulinemia, congenital agammaglobulinemia, and X-linked agammaglobulinemia. AGMX was one of the first immune system diseases identified.
People with AGMX have trouble making antibodies. This makes it more difficult for them to fight infection. Antibodies play a major role in the immune system’s defense against disease.
A parent passes AGMX to their child. A gene abnormality on the X chromosome interferes with the body’s ability to produce antibodies. The gene is known as Bruton’s tyrosine kinase (BTK).
AGMX occurs far more often in men than in women. This is because the mutation that causes the disorder is on the X chromosome. Men only have one X chromosome. A single defective copy of the gene can cause the condition. This is known as X-linked inheritance.
Women have two X chromosomes. That makes it possible for them to be carriers of AGMX. If a woman has one X chromosome without the gene abnormality, it can mask problems caused by the mutation in the other X chromosome. Both of a woman’s parents have to pass on an AGMX mutation for her to have AGMX.
There have been families where AGMX didn’t follow a pattern based on the X chromosome. This may have been due to a new X chromosome mutation. The families may also have been too small to detect the pattern.
The immune system uses antibodies to recognize and fight infections. A mother’s antibodies protect her child during the first six months of the child’s life. After six months, a child must produce their own antibodies. Children with AGMX can’t produce their own antibodies. This leaves them open to disease.
Symptoms of AGMX usually appear when children are between six and nine months old. Some children don’t have symptoms until they’re between three and five years old. Boys generally show symptoms at an earlier age.
Symptoms of AGMX include:
Many of the above conditions also occur in children without AGMX. However, children with AGMX get sick more frequently. They may also have more severe symptoms.
To diagnose AGMX, your child’s doctor will need a complete medical history. They will also perform a physical examination. They will take blood samples to look for immune system problems.
Various tests can determine the antibody levels in your child’s blood. These include flow cytometry, quantitative immunoglobulins, and immunoelectrophoresis.
AGMX treatment depends on a number of factors. These factors include your child’s age, overall health, medical history, and the severity of the condition. One common form of treatment is to replace the antibodies in the blood. Your child will receive antibodies directly into the bloodstream to help stop infections. This is also known as gamma globulin therapy.
If your child has AGMX, there are other things you should be aware of. Children with AGMX should always seek immediate treatment for any infection or illness. They should also avoid live viral vaccinations. In a child with AGMX, a live vaccine could cause the disease instead of helping prevent it.
Children with AGMX can live healthy lives. They can even participate in normal activities, including sports. However, it’s important for them to receive an early diagnosis and successful treatment.
AGMX can be fatal when left untreated. Without antibodies, children have no protection against serious infections.
Even with treatment, children with AGMX may have shortened lives. Chronic lung disease can sometimes cause irreversible damage to their lungs.
Doctors recommend genetic counseling for families with a history of AGMX. Women who know that they are carriers can have tests done while pregnant to check for this condition. The chance of passing the abnormal gene to a child is 50 percent.
Written by: Amanda Delgado and Elizabeth Boskey, PhD
Medically reviewed on: Jan 11, 2016: Mark R Laflamme, MD
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