Bruton-Gitlin Syndrome: Causes, Symptoms & Treatment
Bruton-Gitlin Syndrome is a rare inherited immune deficiency in which B cells are absent and no antibodies are produced. It affects almost exclusively boys.
Things worth knowing about "Bruton-Gitlin Syndrome"
Bruton-Gitlin Syndrome is a rare inherited immune deficiency in which B cells are absent and no antibodies are produced. It affects almost exclusively boys.
What is Bruton-Gitlin Syndrome?
Bruton-Gitlin Syndrome, also known as X-linked agammaglobulinemia (XLA), is a rare congenital disorder of the immune system. It was first described in 1952 by the American physician Ogden Bruton and is classified as a primary immunodeficiency. In this condition, functional B lymphocytes (B cells) are almost completely absent from the blood, which means the body cannot produce antibodies (immunoglobulins). Because the responsible gene is located on the X chromosome, the syndrome affects almost exclusively males.
Causes
Bruton-Gitlin Syndrome is caused by a mutation in the BTK gene (Bruton tyrosine kinase gene), located on the X chromosome. The BTK gene provides instructions for producing an enzyme called Bruton tyrosine kinase, which is essential for the normal development and maturation of B lymphocytes. Without this functional enzyme, precursor cells in the bone marrow cannot develop into mature B cells. Females carry two X chromosomes, so a faulty copy is typically compensated by the second, healthy copy. Males, however, have only one X chromosome and therefore develop the disease when a mutation is present.
Symptoms
Newborns are initially protected by maternal antibodies transferred through the placenta. Once these decline -- typically between 6 and 12 months of age -- the first symptoms usually appear:
- Recurrent bacterial infections, particularly of the respiratory tract (e.g., pneumonia, bronchitis, sinusitis, otitis media)
- Infections caused by encapsulated bacteria such as Streptococcus pneumoniae or Haemophilus influenzae
- Chronic diarrhea, often due to Giardia lamblia
- Absent or markedly reduced lymph nodes and tonsils
- Poor growth and failure to thrive in childhood
Most viral infections are handled normally because T cell immunity remains intact. Notable exceptions include certain enteroviruses and the poliovirus, to which affected individuals are particularly susceptible.
Diagnosis
Diagnosis is established through the following investigations:
- Blood count and immunophenotyping: Demonstration of markedly reduced or absent B cells in peripheral blood
- Immunoglobulin measurement: Very low or undetectable levels of all immunoglobulin classes (IgG, IgA, IgM, IgE)
- Genetic testing: Identification of a BTK gene mutation to confirm the diagnosis
- Family history: Other affected male relatives are often identified
Early diagnosis is critical to prevent serious infectious complications.
Treatment
A cure for Bruton-Gitlin Syndrome is currently only possible through hematopoietic stem cell transplantation, which is reserved for selected cases. The standard treatment consists of lifelong antibody replacement therapy:
- Immunoglobulin replacement therapy (IgG substitution): Regular administration of immunoglobulins, either intravenously (every 3 to 4 weeks) or subcutaneously (weekly or biweekly), to compensate for the missing antibody protection
- Antibiotic therapy: Used to treat acute bacterial infections and, in certain situations, as prophylaxis
- Regular monitoring: Surveillance of immunoglobulin levels, lung function, and general health
With consistent treatment, affected individuals can lead largely normal lives. However, long-term complications such as chronic lung disease or neurological problems from enteroviruses can still occur.
References
- Ochs HD, Smith CI, Puck JM (eds.) - Primary Immunodeficiency Diseases: A Molecular and Genetic Approach. Oxford University Press, 3rd edition, 2014.
- Picard C et al. - International Union of Immunological Societies: 2017 Primary Immunodeficiency Diseases Committee Report on Inborn Errors of Immunity. Journal of Clinical Immunology, 2018. PubMed PMID: 29226302.
- European Society for Immunodeficiencies (ESID) - ESID Registry and Clinical Guidelines for XLA. https://esid.org (accessed 2024).
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