Abstract
X-linked inhibitor of apoptosis (XIAP) deficiency caused by mutations in BIRC4 was initially described in patients with X-linked lymphoproliferative syndrome (XLP) who had no mutations in SH2D1A. In the initial reports, EBV-associated hemophagocytic lymphohistiocytosis (HLH) was the predominant clinical phenotype. Among 25 symptomatic patients diagnosed with XIAP deficiency, we identified 17 patients who initially presented with manifestations other than HLH. These included Crohn-like bowel disease (n. =. 6), severe infectious mononucleosis (n. =. 4), isolated splenomegaly (n. =. 3), uveitis (n. =. 1), periodic fever (n. =. 1), fistulating skin abscesses (n. =. 1) and severe Giardia enteritis (n. =. 1). Subsequent manifestations included celiac-like disease, antibody deficiency, splenomegaly and partial HLH. Screening by flow cytometry identified 14 of 17 patients in our cohort. However, neither genotype nor protein expression nor results from cell death studies were clearly associated with the clinical phenotype. Only mutation analysis can reliably identify affected patients. XIAP deficiency must be considered in a wide range of clinical presentations.
| Original language | English |
|---|---|
| Journal | Clinical Immunology |
| Volume | 149 |
| Issue number | 1 |
| Pages (from-to) | 133-141 |
| Number of pages | 9 |
| ISSN | 1521-6616 |
| DOIs | |
| Publication status | Published - 10.2013 |
Funding
We would like to thank the patients and their families for their participation. We also thank the technicians of the Centre of Chronic Immunodeficiency Advanced Diagnostic Unit for excellent technical assistance. This work was supported by, the German Federal Ministry of Education and Research ( BMBF 01 EO 0803 grant to the Centre of Chronic immunodeficiency and BMBF O1 GM 0896 grant to the PID-NET initiative), a Steno Fellowship from the Danish Council for Independent Research (MG‐H), the Lundbeck Foundation (MG‐H), and the Novo Nordisk Foundation (MG-H).
Research Areas and Centers
- Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)