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Atopic Eczema: Genetic Associations and Potential Links to Developmental Exposures
11 Assistant Professor of Biology, Department of Biology, Belmont Abbey College, Belmont, NC, USA .
Insights
Atopic eczema (AE), or atopic dermatitis (AD), is a common inflammatory skin condition. Research explores genetic and environmental factors, including in utero exposures, to understand disease heterogeneity and find a cure.
Area of Science:
- Dermatology
- Immunology
- Genetics
Background:
- Atopic eczema (AE), also known as atopic dermatitis (AD), is a prevalent inflammatory skin disease.
- It is characterized by a compromised epidermal barrier, allergic immune responses, itch, and skin lesions, frequently affecting infants.
- Current understanding involves two main models: the inside-outside (gut microbiome) and outside-inside (skin barrier/microbiome) hypotheses.
Purpose of the Study:
- To review the complex mechanisms underlying atopic eczema/dermatitis.
- To highlight the role of genetic predispositions and environmental influences, including in utero exposures.
- To emphasize the need for further research into disease heterogeneity and potential cures.
Main Methods:
- Review of existing literature on atopic eczema/dermatitis pathogenesis.
- Analysis of genetic factors, including specific gene alterations (e.g., Flg, Tmem79/Matt) and cytokine pathways.
- Examination of environmental influences and epigenetic modifications.
Main Results:
- Over 30 genes are linked to AD/AE, with common alterations in epidermal structure and immune response genes.
- Evidence suggests developmental exposure to environmental tobacco smoke and phthalates may influence disease development.
- Current management involves topical corticosteroids and calcineurin inhibitors.
Conclusions:
- Atopic eczema/dermatitis is a heterogeneous disease influenced by genetic and environmental factors.
- Understanding in utero exposures is crucial for deciphering disease variability.
- Continued research into genetic alterations and their timing is essential for developing effective treatments and potential cures.
Abstract:
Atopic eczema (AE), or atopic dermatitis (AD), is a common inflammatory skin disease with a disrupted epidermal barrier and an allergic immune response. AD/AE is prominently characterized by a symptomatic itch and transient skin lesions. Infants compose a significant percentage affected. Two models have been proposed to explain AD/AE skin pathology: the gut microbiome-focused inside-outside model and the outside-inside model concentrating on the disrupted skin barrier/skin microbiome. Gene disruptions contributing to epidermal structure, as well as those in immune system genes, are implicated. Over 30 genes have been linked to AD/AE with Flg and Tmem79/Matt alterations being common. Other linked disruptions are in the interleukin-1 family of cytokines/receptors and the TH2 gene family of cytokines. Inheritable epigenetic modifications of the genes or associated proteins may also be involved. Skin barrier disruption and the allergic immune response have been the main foci in mechanistic studies of AD/AE, but the role of the environment is becoming more apparent. Thus, an examination of in utero exposures could be very helpful in understanding the heterogeneity of AD/AE. Although research is limited, there is evidence that developmental exposure to environmental tobacco smoke or phthalates may impact disease. Management for AD/AE includes topical corticosteroids and calcineurin inhibitors, which safely facilitate improvements in select individuals. Disease heterogeneity warrants continued research not only into elucidating disease mechanism(s), via identification of contributing genetic alterations, but also research to understand how/when these genetic alterations occur. This may lead to the cure that those affected by AD/AE eagerly await.