Is Agammaglobulinemia hereditary?

Agammaglobulinemia is a hereditary condition, meaning it is caused by genetic mutations passed from parents to their children. While the most common form, X-linked agammaglobulinemia (XLA), follows a specific sex-linked inheritance pattern, other rarer forms of agammaglobulinemia are inherited in an autosomal recessive manner.

Is Agammaglobulinemia hereditary?

Yes, agammaglobulinemia is a hereditary primary immunodeficiency. It is caused by mutations in specific genes necessary for the development of B-cells, which are vital for producing antibodies. Because these mutations are encoded in your DNA, they can be transmitted through generations, though the specific pattern of inheritance depends on the underlying genetic cause of the agammaglobulinemia.

What are the inheritance patterns of Agammaglobulinemia?

The inheritance of agammaglobulinemia varies significantly depending on the genetic subtype:

• X-linked Agammaglobulinemia (XLA): Caused by mutations in the BTK gene, this is the most common form. It follows an X-linked recessive pattern, meaning it primarily affects males. Female carriers have a 50% chance of passing the gene to each son.


• Autosomal Recessive Agammaglobulinemia: This form occurs when a child inherits two copies of a mutated gene (one from each parent). Parents are typically asymptomatic carriers, and there is a 25% risk of the condition in each pregnancy.

Is genetic testing recommended for families?

Genetic testing is highly recommended for confirming a diagnosis of agammaglobulinemia and for identifying the specific mutation involved. This information is crucial for family planning and understanding the recurrence risk. While de novo (spontaneous) mutations can occur in the BTK gene, they are less common than inherited cases. Genetic counseling is essential for affected families to discuss carrier testing for relatives and prenatal diagnosis options, such as preimplantation genetic testing (PGT) or prenatal screening during pregnancy.

Next steps

• Consult with a clinical geneticist to confirm your specific subtype of agammaglobulinemia.


• Speak with a genetic counselor to map your family history and assess recurrence risks.


• Connect with the agammaglobulinemia community at DiseaseMaps.org to share experiences with others managing this condition.


• Refer to the Immune Deficiency Foundation (IDF) for specialized resources and support.

Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.

References

• National Institutes of Health (NIH) - Genetic and Rare Diseases Information Center (GARD)


• Online Mendelian Inheritance in Man (OMIM)


• Orphanet: Portal for rare diseases and orphan drugs


• Immune Deficiency Foundation (IDF) patient resources