rs6478108

This study identified rs4979462 in the TNFSF15 locus as the causal variant for primary biliary cirrhosis (PBC) susceptibility in the Japanese population through integrated analysis including case-control association (n=1279 PBC cases, n=1091 controls; P=1.85×10⁻¹⁴, OR=1.57) and in vitro functional studies. The PBC-susceptible allele generates a novel NF-1 transcription factor binding site, enhancing TNFSF15 expression and increasing susceptibility to autoimmune liver disease.

This study examined 40 SNPs (34 CD-associated and 6 UC-associated) in 2374 Canadian IBD patients (1144 CD, 1230 UC/IBDU) and 1057 healthy controls. While most immune-related variants showed similar frequencies between CD and UC, the two diseases diverged significantly in genes related to innate immunity and autophagy (NOD2, ATG16L1, IRGM), which were more prevalent in CD. In patients with colon-only CD, genetic overlap with UC was nearly complete, suggesting a shared genetic basis for colonic disease.

This case-control study of 563 Canadian children with pediatric-onset Crohn's disease and 553 controls confirmed associations between SNPs at two novel pediatric-specific loci (rs1250550 at 10q22.3, p=0.026; rs8049439 at 16p11.2, p=0.04) and disease susceptibility. Additionally, 6 of 16 previously reported adult CD loci were significantly associated with pediatric CD, demonstrating substantial genetic overlap between disease forms.

TNFSF15 is confirmed as an IBD susceptibility gene showing ethnic-specific associations in a Caucasian population. The protective Haplotype B (OR=0.64, p=0.01 in CD; OR=0.59, p=0.01 in UC) was significantly associated with disease protection in non-Jewish controls but showed opposite frequency trends in Jewish populations (p=0.04 for gene-ethnicity interaction in CD), demonstrating disease susceptibility is ethnically determined.