rs17375018

This is a Turkish master's thesis investigating the relationship between the rs924080 variant in the IL23R-IL12RB2 intergenic region (previously identified as Behçet's disease-associated in GWAS studies, P<0.0001) and IL23R/IL12RB2 gene expression in healthy volunteers. The study examined 14 healthy subjects (6 heterozygous AG, 4 homozygous AA, 4 GG control for the risk A allele) and found that the rs924080 A risk allele significantly enhanced IL-23R stimulation responses and IL-6 cytokine production, suggesting a modulatory role in Th17 and IL-6 responses implicated in Behçet's disease pathogenesis.

This study investigated sex-specific genetic associations in Crohn's disease by analyzing 71 genome-wide association study (GWAS)-confirmed CD risk loci in 1748 CD cases and 2938 controls. The authors identified that rs3792106 in ATG16L1 exhibits significant sex-specific associations, with females showing stronger disease association (OR=1.48-1.51) compared to males (OR=1.22-1.26). Transmission distortion analysis in HapMap 3 trios suggests sex-biased inheritance patterns contribute to allele frequency differences between healthy males and females at this locus.

This haplotype-based case-control study in 245 Han Chinese ulcerative colitis (UC) patients and 300 controls examined six known UC susceptibility loci. The authors identified IL2 SNP rs2069762 (P=7.0×10⁻⁴, OR=1.54, 95% CI 1.20-1.99) and IL21 SNP rs2055979 (P=1.2×10⁻⁴, OR=1.50, 95% CI 1.17-1.92) as independently associated with UC, demonstrating that unlike in Caucasians, IL2 and IL21 occupy separate linkage disequilibrium blocks in Han Chinese populations. They also identified rs17375018 in IL23R associated with disease extent (pancolitis; P=0.002, OR=2.38, 95% CI 1.41-4.02).