Abstract
The hyper-immunoglobulin E syndrome (HIES) is a rare primary immunodeficiency characterized by recurrent infections, elevated serum IgE-levels, and involvement of the soft- and bony tissues. We speculated that this complex disease may be caused by a microdeletion syndrome. We therefore analyzed 30 sporadic HIES patients for the presence of chromosomal imbalances using Affymetrix 50k XbaI and 23 of the 30 patients with the higher-resolution 250k StyI SNP mapping arrays. We detected only eight different copy number alterations in six patients with the 50k approach, and seven of these presented known polymorphic regions not associated with disease. However, one patient showed a unique gain on chromosome 20p. 250k array analysis identified this gain as a rare polymorphism segregating in the patient’s family, but not associated with the HIES phenotype. In addition, 265 known and novel copy number variants (CNVs) were identified with the 250k arrays, but no recurrent imbalances reminescent of a microdeletion syndrome were found. We aligned the identified CNVs with loci that have been associated with HIES or phenotypically overlapping syndromes. Doing so, a 2-Mb deletion spanning the PEPD gene on 19q13.11 was identified on one allele of one patient. Homozygous mutations in PEPD are responsible for the autosomal-recessive prolidase deficiency which resembles HIES in some aspects. Sequencing of the healthy allele, however, revealed a wild-type sequence. In summary, our results suggest that HIES is not likely to be a microdeletion syndrome.
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Acknowledgments
We thank the patients and their families and Dr. U. Salzer for his help, advice, and the critical reading of the manuscript.
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The work was supported by the Deutsche Forschungsgemeinschaft (DFG) grant GR 1617/3–3.
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Dietmar Pfeifer and Cristina Woellner contributed equally to the work and are considered aequo loco.
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Pfeifer, D., Woellner, C., Petersen, A. et al. The hyper-IgE syndrome is not caused by a microdeletion syndrome. Immunogenetics 59, 913–926 (2007). https://doi.org/10.1007/s00251-007-0257-z
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DOI: https://doi.org/10.1007/s00251-007-0257-z