β2-Adrenergic receptor promoter haplotype influences the severity of acute viral respiratory tract infection during infancy: a prospective cohort studyReportar como inadecuado




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BMC Medical Genetics

, 16:82

First Online: 14 September 2015Received: 09 January 2015Accepted: 09 September 2015

Abstract

BackgroundDespite the significant interest in β2-Adrenergic receptor ADRB2 polymorphisms related to asthma, whether ADRB2 genetic variants are similarly associated with acute respiratory tract infections have not been studied. We hypothesized that genetic variants in ADRB2 associated with a response to asthma therapy during an asthma exacerbation were also associated with severity of acute respiratory tract infections.

MethodsTo test this hypothesis, we genotyped 5 common polymorphisms in the promoter region and coding block of the ADRB2 gene loci -2387 -2274 -1343, +46, and +79 from 374 Caucasian and African American term infants who were enrolled at the time of acute respiratory illness over four respiratory viral seasons. Severity of respiratory tract infections was measured using a bronchiolitis severity score BSS; range = 0-12, clinically significant difference = 0.5 with a higher score indicating more severe disease. We assigned the promoter, coding and combined promoter and coding haplotypes to the unphased genotype data. The associations between each of these five single-nucleotide polymorphisms SNPs as well as the haplotypes and infant BSS were analyzed using nonparametric univariate analysis and multivariable proportional odds model separately in Caucasians and African Americans.

ResultsThere was no significant association between infant BSS and each of the SNPs in both Caucasians and African Americans. However, promoter haplotype CCA was associated with a decreased BSS in African Americans in a dose dependent manner. The median interquartile range BSS of infants with no copies of the CCA haplotype, one copy, and two copies of the CCA haplotype were 5.5 2.0, 8.0, 4.0 1.0, 7.5, and 3.0 1.0, 4.0, respectively. This dose dependent relationship persisted after adjusting for infant age, gender, daycare exposure, secondhand smoke exposure, prior history of breastfeeding, siblings at home, and enrollment season adjusted odds ratio: 0.59, 95 % confidence interval: 0.36, 0.98. There was no similar protective relationship of haplotype CCA on severity of respiratory tract infections identified in Caucasians.

ConclusionsADRB2 genotype may be predictive of severity of acute respiratory tract infections in African Americans, and potentially identify a subset of infants who may respond to beta-agonist therapy.

Electronic supplementary materialThe online version of this article doi:10.1186-s12881-015-0229-3 contains supplementary material, which is available to authorized users.

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Autor: Pingsheng Wu - Emma K Larkin - Sara S Reiss - Kecia N Carroll - Marshall L Summar - Patricia A Minton - Kimberly B Wo

Fuente: https://link.springer.com/







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