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Association analysis of RGS7BP gene polymorphisms with aspirin intolerance in asthmatic patients.

Ann Allergy Asthma Immunol. 2011 Apr;106(4):292-300.e6. Epub 2011 Jan 08
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摘要


BACKGROUND:Signal-regulated palmitoylation of RGS7BP(regulator of G-protein-signaling 7-binding protein) initiates the activation of G-protein-coupled receptors (GPCRs), including muscarinic receptors, which contribute to the development of asthma and its subphenotypes. OBJECTIVE:To determine the association of RGS7BP gene polymorphisms with the development of aspirin-exacerbated respiratory disease (AERD). METHODS:We evaluated the association of RGS7BP gene polymorphisms with response to oral aspirin challenge and with responsiveness to methacholine challenge. RGS7BP messenger RNA splice variants in peripheral blood platelets from patients with different single-nucleotide polymorphisms were analyzed by reverse-transcription polymerase chain reaction. RESULTS:Logistic regression analysis of RGS7BP gene polymorphisms in patients with AERD (n = 102) and aspirin-tolerant asthma (n = 429) revealed that a haplotype of block 3 consisting of rare alleles +98092 C>G, +98853 C>T, and +104450 T>G of the RGS7BP gene was associated with AERD. Multiple linear regression analysis showed that asthmatic patients carrying ht2/ht2 in block 3 were more responsive to aspirin challenge than those not carrying ht2 (P = .008 in a codominant model). The log-transformed provocation concentration that caused a decrease in forced expiratory volume in 1 second of 20% for methacholine was significantly dependent on the BL3-ht2 haplotype. No significant differences in platelet expression of different RGS7BP messenger RNA splice variants were detected between those with and without the BL3-ht2 haplotype. CONCLUSION:BL3-ht2 of RGS7BP may be an important genetic variant associated with AERD. The haplotype of block 3 may play a protective role against aspirin hypersensitivity in asthma, perhaps by altering the responsiveness of muscarinic receptors.

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