Acta Med. 2024, 67: 60-63
Atypical Manifestation of X-linked Agammaglobulinemia – the Importance of Genetic Testing
X-linked agammaglobulinemia (XLA) was one of the first inborn errors of immunity to be described. It is caused by pathogenic variants in the gene for Bruton tyrosine kinase (BTK), which has important functions in B cell development and maturation. Recurrent bacterial infections in the first two years of life and hypogammaglobulinemia with absent B cells in male patients are the most common symptoms. A four-month-old male patient underwent surgical removal of urachus persistens complicated with recurrent scar abscesses. Hypogammaglobulinemia (IgG, IgA, and IgM), low phagocytic activity, mild neutropenia, and a normal percentage of B cells were observed in the patient’s immune laboratory profile. Over time, he suffered recurrent respiratory infections (otitis media and rhinosinusitis) and developed B cell depletion, but interestingly, this was with a normalisation of IgG and IgA levels along with undetectable IgM. Molecular-genetic testing confirmed the presence of the pathogenic variant c.1843C>T in the BTK gene, which is associated with a milder phenotype of XLA. Molecular-genetic testing uncovers the variability of clinical and laboratory features of apparently well-known inherited disorders. Patients with mild “leaky” XLA may have normal levels of non-functional or oligoclonal immunoglobulins.
Keywords
atypical leaky phenotype, Inborn error of immunity, X-linked agammaglobulinemia, molecular-genetic testing, BTK gene.
Funding
This publication has been produced with the support of the Integrated Infrastructure Operational Program for the following project: Systemic Public Research Infrastructure – Biobank for Cancer and Rare Diseases, ITMS: 313011AFG5, which was co-financed by the European Regional Development Fund.
References
Copyright
This is an open-access article distributed under the terms of the Creative Commons Attribution License.
