{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSLC19A1, which encodes the reduced folate carrier (RFC1), is a ubiquitously expressed membrane transporter essential for the cellular uptake of folate cofactors and antifolate agents. This carrier maintains intracellular folate homeostasis and, in doing so, supports one‐carbon metabolic processes vital for DNA synthesis, repair, and methylation. Detailed transcriptional studies have revealed multiple promoter regions and isoforms of the SLC19A1 transcript that underscore its pivotal role in folate metabolism and drug transport."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nA wealth of clinical investigations has demonstrated that genetic polymorphisms in SLC19A1—most notably the common G80A (H27R) variant—can significantly influence the efficacy and toxicity of antifolate therapies such as methotrexate. Altered RFC1 function modulates drug uptake and polyglutamation, thereby affecting treatment outcomes in conditions including acute lymphoblastic leukemia, rheumatoid arthritis, and psoriasis. Moreover, maternal variants in SLC19A1 have been linked to developmental anomalies such as neural tube defects, spina bifida, and autism, likely via impaired folate transport leading to decreased methylation capacity. Collectively, these findings support the use of SLC19A1 genotype as a potential predictive biomarker for both therapeutic response and disease susceptibility."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRecent mechanistic studies have further expanded the known repertoire of SLC19A1 functions. In addition to its canonical role in folate and antifolate transport, SLC19A1 has been identified as the principal importer of cyclic dinucleotides such as 2′3′-cGAMP—a discovery that links folate transport with innate immune activation and antitumor responses. Molecular analyses in leukemic cell models have revealed clustering of mutations within specific transmembrane domains of RFC1 that can confer resistance to antifolate agents. These insights into SLC19A1’s structure–function relationships and its emerging role in immune signaling highlight novel avenues for therapeutic intervention in oncology and immunotherapy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "41", "end_ref": "48"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "J R Whetstine, A J Gifford, T Witt, et al. 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