{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe sodium‐dependent multivitamin transporter (SMVT), encoded by SLC5A6, is a broadly expressed membrane protein that mediates Na⁺‐dependent uptake of essential micronutrients—including biotin (vitamin B₇), pantothenic acid (vitamin B₅), α‑lipoic acid, and even iodide—thereby sustaining diverse cellular functions. SMVT is the major biotin uptake system in intestinal and liver epithelial cells and is also expressed in renal proximal tubules, at the blood–brain barrier, and in ocular, breast, prostate, and retinoblastoma cells. Its wide tissue distribution underpins both physiological nutrient absorption and emerging applications in drug delivery through biotin‐conjugated prodrugs."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nSMVT function is tightly regulated at both transcriptional and post‐translational levels. In intestinal epithelia, biotin deficiency triggers an adaptive upregulation of SMVT expression via specific promoter elements—such as those recognized by gut‑enriched transcription factors (e.g. GKLF and KLF‑4) and AP‑2—and involves chromatin remodeling events mediated by enzymes like holocarboxylase synthetase. In parallel, intracellular signaling pathways including those mediated by protein kinase C, Ca²⁺/calmodulin, and casein kinase 2 modulate transporter activity and membrane localization. Detailed structure–function analyses have identified critical determinants—including conserved regions in the C‑terminal tail, specific histidine and cysteine residues, and a PDZ‐binding motif—that ensure proper protein targeting, stability, and catalytic activity, while stereospecific transport of the bioactive R‑enantiomer of α‑lipoic acid further exemplifies the selectivity of the SMVT system."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic alterations and dysregulation of SLC5A6 have been implicated in a spectrum of human diseases. Variants in SMVT can lead to multisystem disorders marked by developmental delay, motor neuropathies, and immunodeficiency, while altered expression profiles have also been associated with gastric cancer and other tissue‐specific pathologies. Moreover, inflammatory insults—such as exposure to lipopolysaccharide or proinflammatory cytokines during bacterial infections—can diminish SMVT membrane expression and impair biotin uptake, thereby exacerbating nutritional deficiencies. Early molecular diagnosis coupled with timely multivitamin replacement therapy has been shown to ameliorate these deleterious effects, underscoring the transporter’s critical role in maintaining systemic nutritional homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Krishnaswamy Balamurugan, Alvaro Ortiz, Hamid M Said "}, {"type": "b", "children": [{"type": "t", "text": "Biotin uptake by human intestinal and liver epithelial cells: role of the SMVT system."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Physiol Gastrointest Liver Physiol (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1152/ajpgi.00059.2003"}], "href": "https://doi.org/10.1152/ajpgi.00059.2003"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12646417"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12646417"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Krishnaswamy Balamurugan, Nosratola D Vaziri, Hamid M Said "}, {"type": "b", "children": [{"type": "t", "text": "Biotin uptake by human proximal tubular epithelial cells: cellular and molecular aspects."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Physiol Renal Physiol (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1152/ajprenal.00375.2004"}], "href": "https://doi.org/10.1152/ajprenal.00375.2004"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15561972"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15561972"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Shuanghui Luo, Viral S Kansara, Xiaodong Zhu, et al. 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