What Is Agammaglobulinemia?
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
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 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:
- gastrointestinal infections, including chronic
- viral infections from viruses such as polio and
- nasal infections
- eye infections
- blood stream infections
- lung infections
- skin infections
- bone infections
- bronchial infections
- spinal cord infections
- ear infections
- kidney inflammation
- joint disease
- breakdown of red blood cells
- muscle and skin inflammation
- reduced number of neutrophils in the blood
- failure to grow
- blood or colon cancer (rare)
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.
How Is Agammaglobulinemia
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.
How Is Agammaglobulinemia
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.
What Is the Long-Term
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
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.
How Can I Prevent
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.