Abstract
The influence of environmental factors on atopic dermatitis (AD) has been investigated in many cross-sectional studies. It remains however unclear if they could influence AD development early in life. This prospective birth cohort study aimed to monitor aspects of family lifestyle and child’s nutrition within a Caucasian population and to assess its association with AD development over the first 2 years of life. Genetic predisposition was evaluated based on family history and profilaggrin genotyping. Of 149 included children, 36 developed AD. Infants with a family history of atopy developed AD 2.6 times more frequently (30 of 97) than infants without atopic predisposition (6 of 52). Genotyping was carried out on 50% of the children included. Profilaggrin mutations (R501X, 2282del4, R2447X, and S3247X) were infrequent in our population. Lower incidence of AD was observed in infants exposed to a damp housing environment, lower household income, and smoking mothers with a higher but not with a lower education level.
Conclusion: Family history of atopy was a significant risk factor for AD regardless of the most common, currently defined, FLG mutations. Humidity at home and passive smoking seem associated with AD development in infancy.
What is Known: • Atopic dermatitis (AD) is associated with mutations in various genes of the immune system and the epidermal barrier complex in particular filaggrin (FLG) mutation. • Inherited factors alone cannot explain the rising AD; environmental factors are therefore likely to play a decisive role in this rise but the exact role that these factors may play in increasing AD risk in infancy remains unclear. Moreover, the relationship between environmental factors and AD has been the focus of mostly cross-sectional studies and not prospective studies. | |
What is New: • This prospective birth cohort study demonstrates that family history of atopy is a significant risk factor for AD regardless of the most common, currently defined, FLG mutations. • A lower incidence of AD was observed in infants exposed to a moist housing environment, lower household income, and smoking of mothers with a higher but not with a lower education level. |
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Abbreviations
- AB:
-
Antibiotic
- AD:
-
Atopic dermatitis
- CI:
-
Confidence interval
- FLG :
-
Filaggrin
- HR:
-
Hazard ratio
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Swiss National Science Foundation (grant 3203B_133088 to SCZ and 31003A_176097 to CR).
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SCZ conceived and designed the study and participated in the collection data. SM and CL collected the data. CG, PM, and SCZ analyzed the data. CG, PM, and SCZ wrote the first manuscript draft. All authors provided intellectual input, had access to the complete dataset, contributed to manuscript revisions, and approved of the final version. SCZ is the guarantor.
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This prospective birth cohort study was approved by the Research Ethics Committee of the University of Lausanne and was conducted according to the Declaration of Helsinki principles.
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This article does not contain any studies with human participants or animals performed by any of the authors.
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Informed consent was obtained from all individual participants included in the study
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Gallay, C., Meylan, P., Mermoud, S. et al. Genetic predisposition and environmental factors associated with the development of atopic dermatitis in infancy: a prospective birth cohort study. Eur J Pediatr 179, 1367–1377 (2020). https://doi.org/10.1007/s00431-020-03616-5
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DOI: https://doi.org/10.1007/s00431-020-03616-5