Allele *1 of HS1.2 enhancer associates with selective IgA deficiency and IgM concentration
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Date
2009-12-15
Authors
Lolli, Serena
Giambra, Vincenzo
Cianci, Rossella
Mattioli, Claudia
Tampella, Giacomo
Cattalini, Marco
Pandolfi, Franco
Plebani, Alessandro
Frezza, Domenico
Journal Title
Journal ISSN
Volume Title
Publisher
Amer Assoc Immunologists
Abstract
Selective IgA deficiency (IGAD) is the most common primary immunodeficiency, yet its pathogenesis is elusive. The IG (heavy) H chain human 3' Regulatory Region harbors three enhancers and has an important role In Ig synthesis. HS1.2 is the only polymorphic enhancer of the 3'RRs. We therefore evaluated HS1.2 allelic frequencies in 88 IGAD patients and 101 controls. Our data show that IGAD patients have a highly significant increase of homozygousity of the allele *1 (39% in the IGAD patients and 15% in controls), with an increase of 2.6-fold. Allele *4 has a similar trend of allele *2, both showing a significant decrease of frequency in IGAD. No relationship was observed between allele *1 frequencies and serum levels of IgG. However, allele *1 was associated in IGAD patients with relatively low lgM levels (within the 30th lowest percentile of patients). The HS1.2 polymorphism influences Ig seric production, but not IgG switch, in fact 30th lowest or highest percentile of IgG in patients did not associate to different frequencies of HS1.2 alleles. The control on normal healthy subjects did not correlate high or low levels of IgM or IgG with HS1.2 allelic frequence variation. Overall our candidate gene approach confirms that the study of polymorphisms in human diseases is a valid tool to investigate the function of these Regulatory Regions that confers multiple immune features.
Description
Keywords
Common variable immunodeficiency, Virtually identical enhancers, Heavy-chain locus, B-cells, Regulatory region, Histone modifications, Increased frequency, Hs1,2 enhancer, Celiac-disease, Immunoglobulin, Immunology
Citation
Giambra, V. vd. (2009). "Allele *1 of HS1.2 enhancer associates with selective IgA deficiency and IgM concentration". Journal of Immunology, 183(12), 8280-8285.