{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPOT1 (protection of telomeres 1) is a highly conserved component of the shelterin complex that safeguards chromosome ends by directly binding to the single‐stranded, G-rich telomeric overhang via its tandem oligonucleotide/oligosaccharide‐binding (OB) folds. Structural and biochemical studies have demonstrated that POT1 associates with telomeres in vivo and, in concert with partner proteins such as TPP1 and PTOP, forms a protective cap that prevents inappropriate DNA repair and degradation at chromosome termini. This capping function is central to telomere maintenance and genomic stability, as evidenced by high‐resolution crystal structures and cellular analyses that confirm its specific DNA binding and localization to telomeric repeats."}, {"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": "\nIn addition to providing a structural cap, POT1 plays a dynamic role in telomere length regulation by modulating telomerase activity. When complexed with TPP1, POT1 enhances telomerase processivity by stabilizing the telomeric DNA substrate and facilitating the unfolding of inhibitory G-quadruplex structures; under certain conditions, however, POT1 can also act as a negative regulator by restricting telomerase access. This dual functionality is further refined by interactions with replication factors and the CST complex, and recent high‐resolution structural studies of telomerase bound to the POT1–TPP1 heterodimer have illuminated the mechanistic basis of telomerase recruitment and repeat addition. Such regulation underscores how POT1’s positional binding along the telomeric overhang can switch its effects from inhibition to stimulation of telomere elongation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "21"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDisruption of POT1 function—whether by altered expression or deleterious mutations in its OB folds—compromises telomere integrity and triggers genomic instability that has been implicated in cancer predisposition. Both germline and somatic POT1 alterations have been linked to conditions such as familial melanoma, chronic lymphocytic leukemia, Hodgkin lymphoma, and other telomere syndromes. These mutations impair POT1’s ability to bind telomeric DNA, leading to aberrant telomere elongation, increased fragility, and the mis-engagement of DNA repair pathways. Collectively, these studies underscore POT1’s pivotal function in chromosome end protection and highlight its emerging role as a critical susceptibility gene in human malignancies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "22", "end_ref": "38"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Diego Loayza, Titia De Lange "}, {"type": "b", "children": [{"type": "t", "text": "POT1 as a terminal transducer of TRF1 telomere length control."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nature (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/nature01688"}], "href": "https://doi.org/10.1038/nature01688"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12768206"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12768206"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Lorel M Colgin, Katherine Baran, Peter Baumann, et al. 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