Atopic dermatitis: Interaction between genetic variants of GSTP1, TNF, TLR2, and TLR4 and air pollution in early life

Anke Hüls, Claudia Klümper, Elaina A MacIntyre, Michael Brauer, Erik Melén, Mario Bauer, Dietrich Berdel, Anna Bergström, Bert Brunekreef, Moira Chan-Yeung, Elaine Fuertes, Ulrike Gehring, Anna Gref, Joachim Heinrich, Marie Standl, Irina Lehmann, Marjan Kerkhof, Gerard H Koppelman, Anita L Kozyrskyj, Göran PershagenChristopher Carlsten, Ursula Krämer, Tamara Schikowski, TAG Study Group

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

BACKGROUND: Associations between traffic-related air pollution (TRAP) and childhood atopic dermatitis (AD) remain inconsistent, possibly due to unexplored gene-environment interactions. The aim of this study was to examine whether a potential effect of TRAP on AD prevalence in children is modified by selected single nucleotide polymorphisms (SNPs) related to oxidative stress and inflammation.

METHODS: Doctor-diagnosed AD up to age 2 years and at 7-8 years, as well as AD symptoms up to age 2 years, was assessed using parental-reported questionnaires in six birth cohorts (N = 5685). Associations of nitrogen dioxide (NO2 ) estimated at the home address of each child at birth and nine SNPs within the GSTP1, TNF, TLR2, or TLR4 genes with AD were examined. Weighted genetic risk scores (GRS) were calculated from the above SNPs and used to estimate combined marginal genetic effects of oxidative stress and inflammation on AD and its interaction with TRAP.

RESULTS: GRS was associated with childhood AD and modified the association between NO2 and doctor-diagnosed AD up to the age of 2 years (P(interaction) = .029). This interaction was mainly driven by a higher susceptibility to air pollution in TNF rs1800629 minor allele (A) carriers. TRAP was not associated with the prevalence of AD in the general population.

CONCLUSIONS: The marginal genetic association of a weighted GRS from GSTP1, TNF, TLR2, and TLR4SNPs and its interaction with air pollution supports the role of oxidative stress and inflammation in AD.

Original languageEnglish
Pages (from-to)596-605
Number of pages10
JournalPediatric Allergy and Immunology
Volume29
Issue number6
DOIs
Publication statusPublished - Sept 2018

Keywords

  • atopic eczema
  • gene-environment interaction
  • weighted genetic risk scores

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