Toll-Like Receptor 1 Locus Re-examined in a Genome-Wide Association Study Update on Anti-Helicobacter pylori IgG Titers

Gastroenterology. 2022 May;162(6):1705-1715. doi: 10.1053/j.gastro.2022.01.011. Epub 2022 Jan 12.


Background & aims: A genome-wide significant association between anti-Helicobacter pylori (H pylori) IgG titers and Toll-like receptor (TLR1/6/10) locus on 4p14 was demonstrated for individuals of European ancestry, but not uniformly replicated. We re-investigated this association in an updated genome-wide association study (GWAS) meta-analysis for populations with low gastric cancer incidence, address potential causes of cohort heterogeneity, and explore functional implications of genetic variation at the TLR1/6/10 locus.

Methods: The dichotomous GWAS (25% individuals exhibiting highest anti-H pylori IgG titers vs remaining 75%) included discovery and replication sampls of, respectively, n = 15,685 and n = 9676, all of European ancestry. Longitudinal analysis of serologic data was performed on H pylori-eradicated subjects (n = 132) and patients under surveillance for premalignant gastric lesions (n = 107). TLR1/6/10 surface expression, TLR1 mRNA, and cytokine levels were measured in leukocyte subsets of healthy subjects (n = 26) genotyped for TLR1/6/10 variants.

Results: The association of the TLR1/6/10 locus with anti-H pylori IgG titers (rs12233670; β = -0.267 ± SE 0.034; P = 4.42 × 10-15) presented with high heterogeneity and failed replication. Anti-H pylori IgG titers declined within 2-4 years after eradication treatment (P = 0.004), and decreased over time in patients with premalignant gastric lesions (P < 0.001). Variation at the TLR1/6/10 locus affected TLR1-mediated cytokine production and TLR1 surface expression on monocytes (P = 0.016) and neutrophils (P = 0.030), but not mRNA levels.

Conclusions: The association between anti-H pylori IgG titers and TLR1/6/10 locus was not replicated across cohorts, possibly owing to dependency of anti-H pylori IgG titers on therapy, clearance, and antibody decay. H pylori-mediated immune cell activation is partly mediated via TLR1 signaling, which in turn is affected by genetic variation.

Keywords: Bacteria; Immunity; Serology; Single-Nucleotide Polymorphism.

Publication types

  • Meta-Analysis

MeSH terms

  • Antibodies, Bacterial
  • Cytokines / genetics
  • Genome-Wide Association Study
  • Helicobacter Infections* / diagnosis
  • Helicobacter Infections* / drug therapy
  • Helicobacter Infections* / genetics
  • Helicobacter pylori*
  • Humans
  • Immunoglobulin G
  • Stomach Neoplasms* / genetics
  • Toll-Like Receptor 1 / genetics*


  • Antibodies, Bacterial
  • Cytokines
  • Immunoglobulin G
  • TLR1 protein, human
  • Toll-Like Receptor 1