Common intronic variant in the FOG1 megakaryocyte transcription factor gene that modulates platelet count and reactivity through altered GATA-1/FOG1 transcriptional output during thrombopoiesis

Pathogenic glucokinase missense variant that raises the beta-cell glucose sensing threshold, causing lifelong mild fasting hyperglycemia characteristic of MODY2 — a condition that rarely needs treatment but is frequently misdiagnosed as type 1 or type 2 diabetes

Histamine breakdown in blood and tissues - uses methyl groups from SAM

Intergenic variant downstream of TSHZ1, a transcription factor essential for inner ear and auditory canal development; the A allele is associated with increased constitutional susceptibility to motion sickness via vestibular pathway architecture

Intronic FBN1 variant that requires two copies of the G allele to impair fibrillin-1's TGF-β1 sequestration, elevating aortic dissection risk in a recessive pattern

Decreased function CYP2D6 variant common in Asian populations

Intronic variant in the adiponectin receptor 2 gene; rare homozygotes showed a markedly elevated risk of progression from impaired glucose tolerance to type 2 diabetes in a single Finnish cohort study, though evidence remains emerging and unreplicated.

Intergenic variant in the proximal 3' regulatory block near MC4R associated with increased BMI, body fat percentage, elevated leptin, and severe obesity risk

Intergenic tag SNP in the PRG2/PRG3 eosinophil major basic protein gene cluster at 11q12.1 whose C allele increases susceptibility to Crohn's disease, implicating eosinophil granule protein-mediated epithelial damage in IBD pathogenesis

5' UTR variant in the beta-defensin 1 gene that reduces antimicrobial peptide expression in gut and mucosal epithelium, increasing susceptibility to colonic Crohn's disease and dental caries