The abstract is read at the publisher; the summary is JClub's.
Genome-wide meta-analysis in 214,747 Japanese participants found 17 genome-wide significant loci for atrophic gastritis, with serostatus-specific signals including MHC class II dominance in seronegative disease.
- Why it matters: Anti–H. pylori IgG status may mark distinct biological pathways, but prior AG GWAS were too small and rarely compared serostatus strata, leaving genetic heterogeneity unclear.
- What they did: They performed stratified GWAS meta-analyses for AG and severe AG across 75,074 discovery and 139,673 replication Japanese participants, then tested genotype-by-serostatus interactions, HLA/ABO associations, genetic correlations, and structural equation modeling; cross-ancestry integration used 1,357,053 participants.
- The result: Seropositive AG/SAG showed strong overlap with gastric cancer loci (including PSCA and MUC1/MTX1), while seronegative AG/SAG emphasized MHC class II and additional loci (FAP, CCR6, ATP4A); AG–GC genetic correlation was 0.529 and MTAG Omega correlation 0.694, supporting shared genetic components.
The findingWhy it mattersWhat they didThe result
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