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Gene-Environment Interactions in Asthma: Genetic and Epigenetic Effects
Jong-Uk Lee1, Jeong Dong Kim1, Choon-Sik Park2
1Department of Interdisciplinary Program in Biomedical Science Major, Soonchunhyang Graduate School, Bucheon, Korea.
Yonsei Medical Journal
|June 13, 2015
Summary
Genetic studies on asthma risk have not fully explained heritability. Investigating gene-environment interactions, including epigenetics, offers new insights into asthma development and potential interventions.
Area of Science:
- Genetics
- Environmental Health
- Epigenetics
Background:
- Decades of genetic research, including genome-wide association studies (GWAS), have identified numerous single nucleotide polymorphisms (SNPs) associated with asthma risk.
- Despite extensive research, identified genetic variants fail to fully account for the heritability of asthma, a phenomenon known as 'missing' heritability.
Purpose of the Study:
- To explore the role of gene-environment interactions in asthma etiology.
- To investigate the potential of epigenetic mechanisms, such as DNA methylation, in understanding asthma development.
- To identify novel strategies for asthma intervention by targeting the interplay between genes and environmental factors.
Main Methods:
- Review of genetic and genomic approaches applied to asthma research, including linkage analysis, candidate gene studies, and GWAS.
- Examination of environmental factors implicated in asthma, such as allergens, pollutants, and infections.
- Analysis of emerging epigenetic studies, particularly those focusing on DNA CpG methylation in asthma subphenotypes.
Main Results:
- GWAS have identified gene-environment interactions relevant to specific asthma phenotypes, including occupational asthma and those related to tobacco smoke and farm environments.
- Epigenetic modifications, such as DNA methylation, are emerging as a key mechanism mediating gene-environment interactions in asthma.
- Early epigenetic studies using clinical samples show promise for further research into asthma's complex etiology.
Conclusions:
- Addressing the 'missing' heritability in asthma requires a deeper understanding of gene-environment interactions and rare genetic variants.
- Epigenetics offers a promising avenue for elucidating the mechanisms underlying asthma development and identifying potential therapeutic targets.
- Future research integrating clinical data and epigenetic analyses will be crucial for advancing asthma research and intervention strategies.
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