Abstract
Investigation of gene-environment cross talk through epigenetic modifications led to better understanding of the number of complex diseases. Clinical heterogeneity and differential treatment response often contributed by the epigenetic signatures which could be personal. DNA methylation at CpG islands presents a critical nuclear process as a result of gene-environment interactions. These CpG islands are frequently present near the promoter sequence of genes and get differentially methylated under specific environmental conditions. Technical advancements facilitate in high throughput screening of differentially methylated CpG islands. Recent epigenetic studies unraveled several CD susceptibility genes expressed in peripheral blood lymphocytes (PBLs), duodenal mucosa, lamina and epithelial cells that are influenced by differentially methylated CpG islands. Here we highlighted these susceptibility genes; classify these genes based on cellular functions and tissue of expression. We further discussed how these genes interacts with each other to influence critical pathways like NF-κB signaling pathway, IL-17 signaling cascade, RIG-I like receptor signaling pathway, NOD-like receptor pathways among several others. This review also shed light on how gut microbiota may lead to the differential methylation of CpG islands of CD susceptibility genes. Large scale epigenetic studies followed by estimation of heritability of these CpG methylation and polygenic risk score estimation of these genes would prioritize potentially druggable targets for better therapeutics. In vivo studies are warranted to unravel further cellular responses to CpG methylation.
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SS, PK and SG acknowledged the support from DST FIST (Grant No. SR/FST/LS-1/2017/49-C) Funded Department of Human Genetics and Molecular Medicine at Central University of Punjab.
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SS and SG: Conceptualized and wrote the manuscript and reviewed before submission for publication. SG: Prepared the figures. PK: Critically reviewed and gave inputs in writing the manuscript.
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Ghosh, S., Khetarpal, P. & Senapati, S. Functional implications of the CpG island methylation in the pathogenesis of celiac disease. Mol Biol Rep 49, 10051–10064 (2022). https://doi.org/10.1007/s11033-022-07585-w
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DOI: https://doi.org/10.1007/s11033-022-07585-w