Τρίτη 22 Ιανουαρίου 2019

DNA methylation is associated with improvement in lung function on inhaled corticosteroids in pediatric asthmatics

Asthma is the most common chronic disease in children. Inhaled corticosteroids (ICS) are the first-line treatment for asthma control, but up to one-third of children have a poor treatment response. The mechanism of ICS resistance is poorly understood, and the role of DNA methylation in ICS treatment response is not known. We examined the association between peripheral blood DNA methylation and ICS treatment response in 152 pediatric persistent asthmatics from the Childhood Asthma Management Program. Response to ICS was measured by the percentage change in forced expiratory volume in 1 s (FEV1) 8 weeks after treatment initiation. The top CpG sites with a nominal P value less than 0.001 were correlated with gene expression using Pearson's and partial correlations. In 152 participants, mean±SD age was 9.8±2.0 years and median change in FEV1 after ICS initiation was 4.6% (interquartile range: 10.4%). A total of 545 CpG sites were differentially methylated (nominal P

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