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Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 268))

Abstract

There has been a substantial increase in the incidence and the prevalence of allergic disorders in the recent decades, which seems to be related to rapid environmental and lifestyle changes, such as higher exposure to factors thought to exert pro-allergic effects but less contact with factors known to be associated with protection against the development of allergies. Pollution is the most remarkable example of the former, while less contact with microorganisms, lower proportion of unprocessed natural products in diet, and others resulting from urbanization and westernization of the lifestyle exemplify the latter. It is strongly believed that the effects of environmental factors on allergy susceptibility and development are mediated by epigenetic mechanisms, i.e. biologically relevant biochemical changes of the chromatin carrying transcriptionally-relevant information but not affecting the nucleotide sequence of the genome. Classical epigenetic mechanisms include DNA methylation and histone modifications, for instance acetylation or methylation. In addition, microRNA controls gene expression at the mRNA level. Such epigenetic mechanisms are involved in crucial regulatory processes in cells playing a pivotal role in allergies. Those include centrally managing cells, such as T lymphocytes, as well as specific structural and effector cells in the affected organs, responsible for the local clinical presentation of allergy, e.g. epithelial or airway smooth muscle cells in asthma. Considering that allergic disorders possess multiple clinical (phenotypes) and mechanistic (endotypes) forms, targeted, stratified treatment strategies based on detailed clinical and molecular diagnostics are required. Since conventional diagnostic or therapeutic approaches do not suffice, this gap could possibly be filled out by epigenetic approaches.

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Abbreviations

A. lwoffii :

Acinetobacter lwoffii

AD:

Atopic dermatitis

AHR:

Airway hyperresponsiveness

APCs:

Antigen-presenting cells

AR:

Allergic rhinitis

BET:

Bromo- and extraterminal

CB:

Cord blood

DEPs:

Diesel exhaust particles

DNMT:

DNA methyltransferase

DUBs:

Deubiquitinating enzymes

FOXP3 (FOXP3):

Forkhead box protein 3 (gene)

GATA3:

GATA binding protein 3

HATs:

Histone acetyltransferases

HDACis:

HDAC inhibitors

HDACs:

Histone deacetylases

HDMs:

Histone demethylases

HMTs:

Histone methyltransferases

HRVs:

Human rhinoviruses

IFN-γ (IFNG):

Interferon-γ (gene)

IgE:

Immunoglobulin E

IL:

Interleukin

ILCs:

Innate lymphoid cells

MAP:

Mitogen-activated protein

MBD:

Methyl-CpG binding protein

MeCP2:

Methyl-CpG binding protein 2

miRNA:

microRNA

NECs:

Nasal epithelial cells

NO2:

Nitrogen dioxide

NOS1–3 :

Nitric oxide 1–3 synthase genes

PAHs:

Polycyclic aromatic hydrocarbons

PBMCs:

PB mononuclear cells

PKCζ:

Protein kinase C, zeta

RISC:

RNA-induced silencing complex

RORC2 (RORγT):

RAR related orphan receptor C, isoform 2

SAM:

S-adenosyl-l-methionine

SCFAs:

Short-chain fatty acids

SO2:

Sulfur dioxide

TBX21:

T-box 21 (T-bet)

TET1 (TET1):

Tet (10–11 translocation) methylcytosine dioxygenase 1 (gene)

TFs:

Transcription factors

Th:

T helper

Tregs:

Regulatory T cells

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Acknowledgments

Bilal Alashkar Alhamwe is supported by the German Academic Exchange Service (DAAD; Personal Reference no. 91559386) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation; Grant 416910386–GRK 2573/1).

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Correspondence to Holger Garn .

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Potaczek, D.P., Alashkar Alhamwe, B., Miethe, S., Garn, H. (2021). Epigenetic Mechanisms in Allergy Development and Prevention. In: Traidl-Hoffmann, C., Zuberbier, T., Werfel, T. (eds) Allergic Diseases – From Basic Mechanisms to Comprehensive Management and Prevention . Handbook of Experimental Pharmacology, vol 268. Springer, Cham. https://doi.org/10.1007/164_2021_475

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