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Genetic Association in Immunoglobulin G4-Related Disease: A Systematic Review
Kenneth Ka Hei Lai1,2, Tung Tang1, Adeline Yuen Tsing Ho1
1Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong, China.
Introduction:
Genetic studies have investigated the association of genetic variants with immunoglobulin G4-related disease (IgG4-RD). In this study, we summarize the results of genetic association in IgG4-RD.
Materials And Methods:
We performed a literature search in MEDLINE, EMBASE via the OVID platform, Cochrane Central Register of Controlled Trials (CENTRAL), Clinicaltrials: gov" xmlns:xlink="http://www.w3.org/1999/xlink">www.
Clinicaltrials:
gov), and World Health Organization International Clinical Trials Registry Platform (WHO ICTRP) for genetic studies on IgG4-RD on January 20, 2023.
Results:
We identified a total of 431 articles published between 1975 and 2023. After removing all the duplicates, we evaluated the abstract and selected 65 articles for full-text review. Among them, 17 fulfilled the eligibility criteria, including 15 original case-control studies, and two genome-wide association studies. Autoimmune pancreatitis was reported in 15 of the 17 articles, and the other 2 articles included IgG4-related periaortitis/periarteritis and general IgG4-RD subjects. A total of 52 polymorphisms in 25 genes were evaluated, including 13 polymorphisms in the 4 genes of the major histocompatibility complex (MHC) complex. The other genes are involved in different pathways.
Conclusion:
While MHC associations remain the strongest and most consistent across studies, our review identifies emerging non-MHC genetic loci such as KCNA3, CTLA4, PRSS1, and VPS13B, suggesting distinct immune- and tissue-specific pathways in different IgG4-RD phenotypes.
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