TAS2R3 is a gustducin-coupled bitter taste receptor mediating perception of bitter compounds in the oral cavity and gastrointestinal tract, signaling through PLCB2 and the calcium-regulated cation channel TRPM5. Primary function involves detection of bitter taste through activation by diverse compounds including phenolic acids, flavonoids, capsaicin, and ethanol 12. The receptor operates through long-distance hydrophobic interactions and π-π orbital overlapping with aromatic amino acids 2. Genetically, TAS2R3 polymorphisms demonstrate significant disease relevance. Specific SNPs associate with reduced Brassica vegetable intake frequency 3 and modified papillary thyroid carcinoma risk, with the CC haplotype (rs2270009/rs2234001) conferring protective effects and reducing serum triiodothyronine levels 4. The TAS2R3 rs11763979 T-allele associates with decreased sperm acrosome normality, potentially through altered WEE2-AS1 expression affecting meiotic regulation 5. Frameshift mutations cause polysyndactyly through protein dysfunction 6. Clinically, TAS2R3 genetic variation influences food preferences affecting metabolic biomarkers including lipid profiles and glucose levels 3. Sex-dependent skin expression variations suggest broader protective roles beyond taste 7. These findings enable precision nutrition approaches for obesity management based on genetic capsaicin tolerance 8.