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Observational Study
. 2018 Mar;97(9):e0043.
doi: 10.1097/MD.0000000000010043.

Genome-wide association study of maternal genetic effects and parent-of-origin effects on food allergy

Xin Liu  1 , Xiumei Hong, Hui-Ju Tsai, Karen K Mestan, Min Shi, Amira Kefi, Ke Hao, Qi Chen, Guoying Wang, Deanna Caruso, Hua Geng, Yufeng Gao, Jianlin He, Rajesh Kumar, Hongjian Wang, Yunxian Yu, Tami Bartell, Xiao-Di Tan, Robert P Schleimer, Daniel E Weeks, Jacqueline A Pongracic, Xiaobin Wang
Affiliations
Observational Study

Genome-wide association study of maternal genetic effects and parent-of-origin effects on food allergy

Xin Liu et al. Medicine (Baltimore). 2018 Mar.

Abstract

Previous genetic studies of food allergy (FA) have mainly focused on inherited genotypic effects. The role of parental genotypic effects remains largely unexplored. Leveraging existing genome-wide association study (GWAS) data generated from the Chicago Food Allergy Study, we examined maternal genotypic and parent-of-origin (PO) effects using multinomial likelihood ratio tests in 588 complete and incomplete Caucasian FA trios. We identified 1 single nucleotide polymorphism with significant (P < 5×10) maternal effect on any FA (rs4235235), which is located in a noncoding RNA (LOC101927947) with unknown function. We also identified 3 suggestive (P < 5×10) loci with maternal genetic effects: 1 for any FA (rs976078, in a gene desert region on 13q31.1) and 2 for egg allergy (rs1343795 and rs4572450, in the ZNF652 gene, where genetic variants have been associated with atopic dermatitis). Three suggestive loci with PO effect were observed: 1 for peanut allergy (rs4896888 in the ADGB gene) and 2 for any FA in boys only (rs1036504 and rs2917750 in the IQCE gene). Findings from this family-based GWAS of FA provided some preliminary evidence on maternal genotypic or PO effects on FA. Additional family-based studies are needed to confirm our findings and gain new insight into maternal and paternal genetic contribution to FA.

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Conflict of interest statement

The authors have no conflicts of interest to disclose.

Figures

Figure 1
Figure 1
Workflow diagram of the study.
Figure 2
Figure 2
Manhattan plots and Q–Q plots for maternal effects on food allergy.
Figure 3
Figure 3
Manhattan plots and Q–Q plots for parent-of-origin effects on food allergy.
See this image and copyright information in PMC

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