Promoter variant reducing NRF2 transcriptional activity by >50%, impairing the master antioxidant response that controls glutathione synthesis, phase II detoxification, and cytoprotective gene expression

Intergenic GWAS tag SNP near the BCO1 pathway, associated with circulating beta-carotene and retinol levels independently of the functional BCO1 coding variants

5'-UTR variant 33 bases downstream of the IL-4 transcription start site; the T allele alters local RNA secondary structure and is associated with elevated IL-4 production, raised serum IgE, and increased susceptibility to allergic asthma, atopic dermatitis, and allergic rhinitis through amplified Th2-skewed immune responses

Intronic MTR variant associated with elevated homocysteine and B12-dependent methylation stress

SNCA upstream regulatory variant (near gene-5) that is part of the 4-SNP SNCA risk haplotype (OR 2.51 for PD) and shows an independent TT homozygote association with Parkinson's disease risk and cognitive impairment

Deep intronic CYP2D6 variant in intron 2 that serves as a haplotype tag in specific CYP2D6 sub-alleles; independent functional effect on enzyme activity is not established

Intronic PTPN1 tag SNP within the 100-kb PTP1B insulin-resistance haplotype block; the minor C allele co-segregates with the risk haplotype associated with elevated PTP1B expression, impaired insulin signaling, and lipid dysregulation

Second independent intronic BTBD9 variant associated with restless legs syndrome and periodic limb movements during sleep via iron homeostasis and dopaminergic dysregulation

Intronic LIPC variant associated with susceptibility to low HDL-C and coronary heart disease through hepatic lipase activity modulation; A allele (minor, ~29% globally) confers elevated CHD risk

Beta-3 adrenergic receptor variant that impairs catecholamine-stimulated lipolysis and thermogenesis in visceral adipose tissue, increasing susceptibility to abdominal obesity and metabolic dysfunction