{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nHuman UGT1A4 is a hepatic phase II enzyme that catalyzes the glucuronidation of a broad spectrum of substrates including primary, secondary, and tertiary amines, various steroids, and environmental toxins. Early studies identified common genetic variations in the UGT1A gene locus – particularly in UGT1A4 – such as the missense polymorphisms P24T and L48V that alter its catalytic activity and substrate specificity. These naturally occurring single nucleotide polymorphisms, along with promoter region variants that affect inducibility, form haplotypes that may underlie the marked interindividual differences in enzyme expression and function in different ethnic populations and developmental stages."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMechanistic investigations have demonstrated that UGT1A4 exhibits complex kinetics with evidence for multiple aglycone binding sites leading to atypical (homotropic and heterotropic) kinetic profiles. Its substrate specificity encompasses drugs such as tobacco‐derived procarcinogens (e.g., NNAL), vitamin D metabolites, and compounds used in antiepileptic, antipsychotic, and anticancer therapies. Comparative enzyme kinetic studies show that genetic variants can either enhance or impair glucuronidation efficiency in a substrate‐dependent manner. For example, UGT1A4 variants affect the glucuronidation of lamotrigine and tamoxifen as well as conjugation of 25‑hydroxyvitamin D3, thereby influencing overall drug clearance and efficacy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "20"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nClinically, the functional variability of UGT1A4 has significant implications for pharmacotherapy and toxicity. Genetic polymorphisms in UGT1A4 are associated with altered serum levels, efficacy, and adverse reaction risk for drugs such as lamotrigine, tamoxifen, olanzapine, and even voriconazole. Moreover, studies in diverse populations—including pediatric cohorts, pregnant women, and patients with conditions like epilepsy, schizophrenia, and breast cancer—have linked UGT1A4 genotype with differences in drug clearance, skin reactions, and treatment outcomes. These findings underscore the potential of UGT1A4 genotyping to guide personalized medicine strategies and to predict herb–drug or drug–drug interactions in clinical settings."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "21", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Doris Wiener, Jia-Long Fang, Nicole Dossett, et al. 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