Abstract
Atopic dermatitis (eczema) is a chronic inflammatory skin disease with onset mainly in early childhood1. It is commonly the initial clinical manifestation of allergic disease, often preceding the onset of respiratory allergies2,3. Along with asthma and allergic rhinitis, atopic dermatitis is an important manifestation of atopy that is characterized by the formation of allergy antibodies (IgE) to environmental allergens. In the developed countries, the prevalence of atopic dermatitis is approximately 15%, with a steady increase over the past decades4,5. Genetic and environmental factors interact to determine disease susceptibility and expression6, and twin studies indicate that the genetic contribution is substantial7. To identify susceptibility loci for atopic dermatitis, we ascertained 199 families with at least two affected siblings based on established diagnostic criteria8,9. A genome-wide linkage study revealed highly significant evidence for linkage on chromosome 3q21 (Zall=4.31, P= 8.42×10−6). Moreover, this locus provided significant evidence for linkage of allergic sensitization under the assumption of paternal imprinting (hlod=3.71, α=44%), further supporting the presence of an atopy gene in this region. Our findings indicate that distinct genetic factors contribute to susceptibility to atopic dermatitis and that the study of this disease opens new avenues to dissect the genetics of atopy.
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Acknowledgements
We thank the families for participation; R. Nickel for help in initiating this project; M. Schwarz for technical assistance; T. Jakob and R. Mayrl for help with family recruitment; and G. Nürnberg for preparing the figures. This work was supported by Bundesministerium für Forschung und Technologie and the German Human Genome Project.
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Lee, YA., Wahn, U., Kehrt, R. et al. A major susceptibility locus for atopic dermatitis maps to chromosome 3q21. Nat Genet 26, 470–473 (2000). https://doi.org/10.1038/82625
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DOI: https://doi.org/10.1038/82625
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