Abstract
Introduction
X-linked agammagobulinemia (XLA) is a primary immunodeficiency disorder caused by Bruton's tyrosine kinase (Btk) gene mutation. Recent studies suggested genotype-phenotype correlation in XLA, but a definitive association remains controversial.
Patients and Methods
We examined the relationship between specific Btk gene mutations and severity of clinical presentation in 62 patients with XLA. Disease severity was assessed by the age of disease onset and the presence of severe infections, while mutations were classified into severe and mild based on structural and functional consequence by bioinformatics analysis.
Results
Fifty-six Btk mutations were identified in 62 patients from 57 kindreds. Variation in phenotypes was observed, and there was a tendency of association between genotype and age of disease onset as well as occurrence of severe infections.
Conclusion
A critical analysis of the circumstances upon presentation also revealed that under-recognition of recurrent infections and relevant family history are important hurdles to timely diagnosis of XLA.
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Acknowledgment
The authors would like to thank the Hong Kong Society for the Relief of Disabled Children for funding the molecular testing of primary immunodeficiency disorders for our patients.
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All the authors have no conflict of interest to declare.
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PPW Lee and TX Chen were co-first authors and had equal contributions to the study.
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Lee, P.P.W., Chen, TX., Jiang, LP. et al. Clinical Characteristics and Genotype-phenotype Correlation in 62 Patients with X-linked Agammaglobulinemia. J Clin Immunol 30, 121–131 (2010). https://doi.org/10.1007/s10875-009-9341-5
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DOI: https://doi.org/10.1007/s10875-009-9341-5