{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n β‐Carotene 15,15′‐oxygenase 1 (BCO1) is a pivotal enzyme in mammalian vitamin A metabolism that catalyzes the symmetric oxidative cleavage of provitamin A carotenoids—principally β‐carotene—into retinaldehyde, the key precursor of retinoids required for vision, embryonic development, immune function, cell differentiation, and metabolic regulation (1,2,3,6,10,11). Detailed biochemical studies using purified recombinant enzyme preparations have established its substrate specificity and catalytic efficiency, demonstrating that full‐length provitamin A carotenoids are favored substrates and that its reaction mechanism relies on conserved iron–coordinating residues (6,10,11,24). In parallel, human and animal studies have shown that genetic polymorphisms in the BCO1 gene (including coding variants such as R267S and A379V, as well as several promoter and upstream single nucleotide polymorphisms) markedly influence the conversion efficiency of β‐carotene to retinoids. These variants are associated with altered plasma carotenoid levels, disparities in circulating vitamin A metabolites, and tissue‐specific retinoid production, thereby contributing to inter‐individual and inter‐ethnic differences in vitamin A status and disease risk (1,2,4,9,14,23,27,34,35,37)."}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Furthermore, BCO1 expression is subject to multifactorial regulation. Transcriptional control by factors such as ISX in response to β‐carotene–derived retinoic acid, as well as modulation by dietary components and hormonal signals (for example, glucocorticoids that act via PPAR pathways), serve to fine‐tune local retinoid synthesis in tissues as diverse as the intestine, liver, lung, heart, and retina (5,7,8,17,18,19,22,28,31,32,36). In experimental models, BCO1 deficiency results in β‐carotene accumulation and perturbations in inflammatory and lipid metabolic gene networks, underscoring its broader role in systemic energy homeostasis and disease pathogenesis, including effects on hepatic cholesterol levels, cardiac function, and even cancer cell behavior (15,19,21,22,29,30,32)."}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, BCO1 constitutes a central molecular link between dietary carotenoid intake and retinoid‐mediated biology. Genetic variation and external regulatory cues converge on BCO1 to determine the efficiency of β‐carotene conversion, thereby influencing vitamin A homeostasis and modulating risk for diverse conditions ranging from developmental abnormalities and metabolic disorders to certain cancers. Ongoing research using human genetic studies, knockout models, and biochemical assays continues to elucidate how modulation of BCO1 activity can be leveraged to inform personalized dietary recommendations and therapeutic strategies (16,26,27,33,36,37).\n\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "b", "children": [{"type": "t", "text": "Citations:"}]}]}, {"type": "t", "text": "\n <ul>\n <li>"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ": Abstract 19185284\n </li>\n <li>"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ": Abstract 19103647\n </li>\n <li>"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ": Abstract 24106281\n </li>\n <li>"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ": Abstract 22113863\n </li>\n <li>"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ": 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