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What is the evidence for interactions between filaggrin null mutations and environmental exposures in the aetiology of atopic dermatitis? A systematic review

Lookup NU author(s): Professor Nick Reynolds

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2019 The Authors. British Journal of Dermatology published by John Wiley & Sons Ltd on behalf of British Association of DermatologistsBackground: Epidemiological studies indicate that gene–environment interactions play a role in atopic dermatitis (AD). Objectives: To review the evidence for gene–environment interactions in AD aetiology, focusing on filaggrin (FLG) loss-of-function mutations. Methods: A systematic search from inception to September 2018 in Embase, MEDLINE and BIOSIS was performed. Search terms included all synonyms for AD and filaggrin/FLG; any genetic or epidemiological study design using any statistical methods were included. Quality assessment using criteria modified from guidance (ROBINS-I and Human Genome Epidemiology Network) for nonrandomized and genetic studies was completed, including consideration of power. Heterogeneity of study design and analyses precluded the use of meta-analysis. Results: Of 1817 papers identified, 12 studies fulfilled the inclusion criteria required and performed formal interaction testing. There was some evidence for FLG–environment interactions in six of the studies (P-value for interaction ≤ 0·05), including early-life cat ownership, older siblings, water hardness, phthalate exposure, higher urinary phthalate metabolite levels (which all increased AD risk additional to FLG null genotype) and prolonged breastfeeding (which decreased AD risk in the context of FLG null genotype). Major limitations of published studies were the low numbers of individuals (ranging from five to 94) with AD and FLG loss-of-function mutations and exposure to specific environmental factors, and variation in exposure definitions. Conclusions: Evidence on FLG–environment interactions in AD aetiology is limited. However, many of the studies lacked large enough sample sizes to assess these interactions fully. Further research is needed with larger sample sizes and clearly defined exposure assessment.


Publication metadata

Author(s): Blakeway H, Van-de-Velde V, Allen VB, Kravvas G, Palla L, Page MJ, Flohr C, Weller RB, Irvine AD, McPherson T, Roberts A, Williams HC, Reynolds N, Brown SJ, Paternoster L, Langan SM

Publication type: Review

Publication status: Published

Journal: British Journal of Dermatology

Year: 2019

Volume: 183

Issue: 3

Pages: 443-451

Print publication date: 01/09/2020

Online publication date: 03/12/2019

Acceptance date: 02/12/2019

ISSN (print): 0007-0963

ISSN (electronic): 1365-2133

Publisher: Blackwell Publishing Ltd

URL: https://doi.org/10.1111/bjd.18778

DOI: 10.1111/bjd.18778

PubMed id: 31794059


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