Background: Studying associations between genes and asthma endotypes and interactions with environment could help to identify new susceptibility genes. We used a previously identified asthma endotype characterized by adult-onset asthma, poor lung function, and high level of Fluorescent oxidation products, a marker of damages due to oxidative stress. This endotype was associated with high occupational exposure to irritants. We aimed to investigate the associations between genes related to oxidative stress and this endotype, and if the associations differed according to irritants exposure.
Methods: We conducted association analyses between the asthma endotype and genetic variants (4715 SNPs) located in 422 genes involved in the "response to oxidative stress" in adults from the Epidemiological study on the Genetic and Environment of Asthma. Analyses using logistic regression were conducted first in all participants, and then separately among high vs. non-exposed participants to assess whether association differs according to irritants exposure.
Results: An association was found between the SNP rs1419958 located in PID1 gene and the endotype (P = 2.2E-05), reaching significance level after correction for multiple testing. This association was even more significant in non-exposed participants (P = 1.06E-06) while there was no association in participants with high exposure to occupational irritants.
Conclusion: This study showed a significant association between an asthma endotype and PID1, a promising candidate gene, the association being different according to the exposure to irritants. These results highlight the interest of studying asthma endotypes in association with genes from candidate pathways and their link with occupational irritants to decipher asthma etiology.
Keywords: Asthma; Endotypes; Gene association study; Irritants; Occupational exposure; Oxidative stress.
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