{"gene":"PINX1","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2001,"finding":"PinX1 was identified as a Pin2/TRF1-binding protein that directly binds the telomerase catalytic subunit hTERT via its TID (telomerase inhibitory domain) and potently inhibits telomerase activity in vitro and in vivo. Overexpression inhibits telomerase, shortens telomeres, and induces crisis; depletion increases telomerase activity and elongates telomeres.","method":"Co-immunoprecipitation, in vitro telomerase inhibition assay (TRAP), overexpression and RNAi depletion in human cells, xenograft tumorigenicity assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution of telomerase inhibition, reciprocal binding assays, functional rescue experiments, replicated by multiple subsequent studies","pmids":["11701125"],"is_preprint":false},{"year":2002,"finding":"The yeast homolog of PinX1 (Gno1p) is involved in rRNA and snoRNA maturation; its G-patch domain is essential for both rRNA processing and snoRNA maturation. PinX1 complements the gno1Δ mutation, indicating a conserved dual function in telomere regulation and rRNA maturation consistent with its nucleolar localization.","method":"Yeast genetics (GNO1 deletion), complementation assay with human PinX1, Northern blot, mutational analysis of G-patch domain","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic deletion, domain mutagenesis, complementation, multiple orthogonal methods in a single study","pmids":["12107183"],"is_preprint":false},{"year":2004,"finding":"PinX1 binds directly to hTERT protein (primarily to its hTR-binding domain) in vitro, and also associates with hTR in a cellular context dependent on hTERT presence, suggesting PinX1 represses telomerase by binding the assembled hTERT·hTR complex.","method":"In vitro binding assays (pulldown), co-immunoprecipitation in cells with hTERT/hTR depletion controls","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro direct binding assay plus cellular co-IP with mechanistic dissection of complex dependency, single lab but multiple orthogonal methods","pmids":["15381700"],"is_preprint":false},{"year":2009,"finding":"PinX1 is a novel microtubule-binding protein that localizes to nucleoli and telomeres in interphase and relocalizes to chromosome periphery and the outer kinetochore plate in mitosis. Kinetochore localization depends on Hec1 and CENP-E. Depletion by siRNA causes anaphase chromatid bridges and micronuclei, demonstrating an essential role in faithful chromosome segregation.","method":"Deconvolution microscopy, deletion mapping, siRNA knockdown, real-time imaging, biochemical microtubule-binding assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (live imaging, biochemical binding, genetic knockdown with defined phenotype, domain mapping), single rigorous study","pmids":["19553660"],"is_preprint":false},{"year":2009,"finding":"Silencing PinX1 in telomerase-positive cancer cells causes robust telomere shortening and reduces the endogenous association of telomerase with the POT1-containing telomeric protein complex, revealing a positive role for PinX1 in telomerase recruitment to telomeres.","method":"shRNA knockdown, telomere length analysis, co-immunoprecipitation of telomerase with POT1 complex","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal co-IP with functional telomere phenotype, single lab, two methods","pmids":["19117989"],"is_preprint":false},{"year":2009,"finding":"PinX1 interacts with Nucleolin at chromosome periphery via its C-terminus; Nucleolin depletion abolishes PinX1 chromosome-periphery localization, and co-depletion of both proteins abrogates chromosome congression, indicating PinX1 is recruited to chromosome periphery by Nucleolin to facilitate chromosome congression.","method":"Co-immunoprecipitation, deconvolution microscopy, siRNA depletion of Nucleolin, real-time mitosis imaging","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal co-IP, epistasis-style localization rescue, live imaging, single lab","pmids":["19393617"],"is_preprint":false},{"year":2009,"finding":"PinX1 regulates nucleolar accumulation and telomeric association of TRF1: overexpressed PinX1 forces endogenous TRF1 into the nucleolus and upregulates TRF1 binding to telomeres; the C-terminal region of PinX1 is required for nucleolar localization.","method":"Co-localization studies, overexpression of deletion mutants, TRF1 telomere ChIP-like analysis, fibrillarin co-staining","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — localization with functional consequence (TRF1 redistribution), domain mapping, single lab","pmids":["19265708"],"is_preprint":false},{"year":2010,"finding":"PinX1 is recruited to telomeres by TRF1 via the TRF homology domain of TRF1 interacting with a minimal 20-amino-acid sequence of PinX1; disrupting this interaction by mutating Leu-291 of PinX1 or knocking down TRF1 abolishes telomere localization of PinX1 and its ability to inhibit telomere elongation, without affecting telomerase activity per se.","method":"Mutagenesis (Leu-291 substitution), RNAi of TRF1, telomere length assay, telomerase activity assay, co-immunoprecipitation, domain-mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — site-directed mutagenesis + RNAi epistasis + functional telomere assay, multiple orthogonal methods, mechanistically rigorous","pmids":["21119197"],"is_preprint":false},{"year":2010,"finding":"Polo-like kinase 1 (Plk1) interacts with PinX1 and phosphorylates it at five sites in mitosis; Plk1 overexpression promotes PinX1 proteasomal degradation dependent on ubiquitin, while Plk1 depletion increases PinX1 stability, establishing Plk1 as a negative regulator of PinX1 stability via mitotic phosphorylation.","method":"Co-immunoprecipitation, in vitro kinase assay, overexpression/siRNA depletion, proteasome inhibitor treatment, phosphosite mutagenesis","journal":"European journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay, mutagenesis of phosphosites, co-IP, degradation assay with controls; single lab with multiple orthogonal methods","pmids":["20573420"],"is_preprint":false},{"year":2010,"finding":"Anthracyclines downregulate PinX1 protein through the ubiquitin-proteasome pathway, thereby disrupting PinX1-mediated telomerase recruitment to telomeres and causing telomere dysfunction specifically in telomerase-positive cancer cells.","method":"Western blot, ubiquitination assay, proteasome inhibitor rescue, telomerase association assay (co-IP), telomere dysfunction assays in cancer cells","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ubiquitination assay with proteasome rescue, functional telomerase localization assay, single lab with two orthogonal methods","pmids":["21643006"],"is_preprint":false},{"year":2010,"finding":"The C-terminal fragment of LPTS/PinX1 (residues 290–328) is the telomerase inhibitory domain (TID) that directly associates with hTERT and shows stronger in vitro telomerase inhibitory activity than full-length protein; residues 254–289 mediate binding to Pin2/TRF1; overexpression of 290–328 shortens telomeres while expression of dominant-negative 1–289 elongates them.","method":"Domain-mapping pulldowns, in vitro TRAP telomerase assay with truncation mutants, overexpression of fragments in cells with telomere length analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro telomerase inhibition reconstitution with defined domain, functional cell assays; single lab","pmids":["20620128"],"is_preprint":false},{"year":2011,"finding":"PinX1 heterozygosity in mice activates telomerase and leads to telomerase-dependent chromosomal instability; PinX1-null mice are embryonic lethal; most PinX1+/- mice spontaneously develop malignant tumors with chromosome instability, establishing PinX1 as a haploinsufficient tumor suppressor essential for chromosome stability.","method":"PinX1 knockout/heterozygous mouse model, MEF telomerase activity assay, cytogenetic chromosome instability analysis, tumor histopathology, p53 mutant epistasis cross","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo genetic mouse model, multiple orthogonal phenotypic readouts (telomerase activity, chromosomal instability, tumor development), epistasis with p53","pmids":["21436583"],"is_preprint":false},{"year":2012,"finding":"Endogenous PinX1 associates with telomeres primarily at mitosis; knockdown of PinX1 causes delayed mitotic entry and reduces accumulation of TRF1 on telomeres during mitosis, indicating PinX1 stabilizes TRF1 at mitosis to promote M phase entry.","method":"Chromatin immunoprecipitation (telomere ChIP), siRNA knockdown, cell cycle analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — endogenous telomere ChIP, functional knockdown phenotype, cell-cycle analysis; single lab","pmids":["22331467"],"is_preprint":false},{"year":2012,"finding":"PinX1 is involved in cell-cycle-dependent trafficking of hTERT to telomeres during mid-late S phase; PinX1 silencing reduces telomerase localization to telomeres and also mediates chromosomal localization of hTERT during anaphase.","method":"Immunofluorescence co-localization, siRNA silencing, cell-cycle synchronization","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — fluorescence localization with siRNA perturbation, cell cycle staging; single lab","pmids":["22749911"],"is_preprint":false},{"year":2014,"finding":"PinX1 overexpression stabilizes TRF1 protein; PinX1 depletion leads to TRF1 ubiquitination and degradation and reduced TRF1 telomere association, causing DNA damage responses at telomeres and chromosome instability. hTERT plays dual roles in this pathway: it is required for PinX1-mediated TRF1 stability, yet co-knockdown of PinX1 and hTERT restores TRF1 stability and suppresses chromosome instability.","method":"siRNA knockdown, co-immunoprecipitation, ubiquitination assay, telomere dysfunction-induced foci (TIF) assay, cytogenetics, ectopic hTERT expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (ubiquitination assay, co-IP, cytogenetics, epistasis with hTERT knockdown), single rigorous study","pmids":["24415760"],"is_preprint":false},{"year":2014,"finding":"Yeast Gno1p and human PINX1 activate the DEAH-box RNA helicase Prp43p (human DHX15) via their G-patch domain, stimulating its ATPase activity in vitro; this interaction is required for maturation of pre-40S and pre-60S ribosomal particles in yeast. PINX1 interacts with human PRP43/DHX15 in HeLa cells.","method":"In vitro ATPase stimulation assay, co-immunoprecipitation (yeast and human cells), G-patch mutagenesis, ribosome biogenesis analysis (sucrose gradient sedimentation)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical reconstitution of ATPase stimulation, G-patch mutagenesis, complementation genetics, cellular co-IP; multiple orthogonal methods","pmids":["24823796"],"is_preprint":false},{"year":2015,"finding":"PinX1 inhibits breast cancer cell migration and invasion by suppressing MMP-9 expression and activity via NF-κB-dependent transcription.","method":"siRNA/overexpression in breast cancer cells, gelatin zymography, western blot, NF-κB reporter assay, nude mouse tail-vein metastasis model","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — NF-κB reporter assay plus functional migration/invasion assays, in vivo model; single lab","pmids":["25888829"],"is_preprint":false},{"year":2015,"finding":"PINX1 interacts with the N-terminal domain of estrogen receptor alpha (ERα) and functions as a transcriptional corepressor, repressing both AF-1 and AF-2 transcriptional activities; ChIP assays confirmed the ERα-PINX1 interaction on E2-regulated promoters.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter assay (AF-1/AF-2 activity), ERα domain mapping, proliferation assays","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP, ChIP, reporter assay; single lab with multiple methods","pmids":["26187699"],"is_preprint":false},{"year":2017,"finding":"Nucleophosmin (NPM) directly interacts with PinX1; PinX1 acts as a linker between NPM and hTERT, and NPM recruitment to the telomerase complex by PinX1 partially attenuates PinX1-mediated telomerase inhibition.","method":"Co-immunoprecipitation, direct binding assay, telomerase activity assay (TRAP), domain mapping","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP of endogenous proteins, functional telomerase activity assay, single lab","pmids":["28255170"],"is_preprint":false},{"year":2017,"finding":"EV71 viral protease 3C directly interacts with PinX1 and cleaves it at the Q50–G51 site via its protease activity; this cleavage promotes host cell apoptosis and facilitates EV71 release.","method":"Co-immunoprecipitation of 3C and PinX1, in vitro cleavage assay with 3C protease, overexpression/siRNA, apoptosis assay, viral release measurement","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro cleavage with defined cleavage site, co-IP, functional loss-of-function; single lab","pmids":["27847364"],"is_preprint":false},{"year":2017,"finding":"NF-κB p65 directly binds two consensus response elements in the LPTS/PinX1 promoter (at −1143/−1136 and −888/−881) and transcriptionally represses LPTS/PinX1 expression; mutation of both sites rescues p65-suppressed promoter activity.","method":"EMSA (electrophoretic mobility shift assay), chromatin immunoprecipitation (ChIP), promoter-reporter assay with site-directed mutagenesis","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — EMSA, ChIP, mutagenesis of binding sites; single lab with multiple orthogonal methods","pmids":["29017500"],"is_preprint":false},{"year":2019,"finding":"PinX1 transcriptionally activates miR-125a-3p expression, which in turn inhibits VEGF (a miR-125a-3p target), thereby repressing tumor angiogenesis in renal cell carcinoma; ChIP and luciferase reporter assays confirmed the transcriptional mechanism.","method":"miRNA microarray, chromatin immunoprecipitation (ChIP), luciferase reporter assay, siRNA, in vitro angiogenesis assay, xenograft model","journal":"Angiogenesis","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP and luciferase reporter validate transcriptional activation, functional assays, single lab","pmids":["31254127"],"is_preprint":false},{"year":2019,"finding":"The PinX1/NPM interaction peaks during early S phase; NPM localization in the nucleolus during S phase requires PinX1, and the NPM/PinX1/hTERT ternary complex forms predominantly in early S phase, facilitating telomerase activation when telomere extension occurs.","method":"Immunofluorescence co-localization, cell cycle synchronization, co-immunoprecipitation, telomere length assay (TRF assay)","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP in synchronized cells, fluorescence localization, functional telomere assay; single lab","pmids":["31210926"],"is_preprint":false},{"year":2019,"finding":"EBV LMP1 inhibits PINX1 transcription by promoting binding of NF-κB p65 to three specific sites in the PINX1 promoter, resulting in increased telomerase activity and telomere elongation.","method":"Chromatin immunoprecipitation (ChIP), dual-luciferase reporter assay, LMP1 overexpression, TRAP telomerase assay, Southern blot for telomere length","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP and reporter assay with LMP1 mechanistic dissection; single lab","pmids":["31027734"],"is_preprint":false},{"year":2020,"finding":"The G-patch binding modes of Pfa1 and PINX1 to Prp43 are distinct: a protruding β4–β5 loop of Prp43 OB fold is required for Pfa1 G-patch binding but not for PINX1 binding. However, this same loop is essential for stimulation of Prp43 ATPase and helicase activities by both proteins and for Prp43 function in ribosome biogenesis.","method":"In vitro ATPase assay, helicase assay, yeast genetics (Prp43 loop mutants), co-immunoprecipitation, ribosome biogenesis analysis","journal":"RNA biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic reconstitution, mutagenesis, genetic yeast model, multiple orthogonal methods in a single study","pmids":["32882145"],"is_preprint":false},{"year":2014,"finding":"PinX1 regulates TRF1 stability in a PinX1-telomere binding manner: the LPTS/PinX1(254–289) fragment binds Pin2/TRF1 while LPTS/PinX1(290–328) binds hTERT; Pin2/TRF1 interaction recruits PinX1 to telomeres.","method":"Domain deletion analysis, co-immunoprecipitation, in vitro telomerase inhibition assay, cellular telomere length analysis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro domain binding assays and telomerase inhibition, single lab","pmids":["20620128"],"is_preprint":false},{"year":2014,"finding":"p53 functions as a transcriptional activator of PinX1 expression by directly binding the PinX1 promoter; HPV16 E6 suppresses PinX1 expression by inhibiting p53 transcriptional activity, thereby enhancing telomerase activity.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, p53 overexpression/knockdown, E6 expression, TRAP telomerase assay","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — ChIP and reporter assay with mechanistic dissection; single lab","pmids":["24412852"],"is_preprint":false},{"year":2015,"finding":"TERT stabilizes nucleolar PinX1 protein: PinX1 stability is reduced in TERT-depleted cells and increased in TERT-overexpressing cells; this effect is specific to the C-terminal nucleolar fragment PinX1(205–328) that binds TERT, not the N-terminal nuclear fragment.","method":"TERT siRNA knockdown and overexpression, protein stability assays (cycloheximide chase) with truncation mutants","journal":"Molecules and cells","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — protein stability assay with domain truncation analysis and TERT perturbation, single lab","pmids":["26194824"],"is_preprint":false},{"year":2024,"finding":"PINX1 is an uncharacterized PARP1-interacting protein: it binds to the ZnF3-BRCT domain of PARP1, promotes PARP1-chromatin association, and facilitates downstream recruitment of the DNA repair factor XRCC1. Loss of PINX1 compromises DNA damage repair capacity, and this vulnerability is independent of its telomerase inhibitory activity.","method":"Immunoprecipitation-mass spectrometry (for interactor identification), co-immunoprecipitation, chromatin fractionation, DNA damage assays (γH2AX), rescue with telomerase-inhibitory mutant PINX1, XRCC1 recruitment assay","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — IP-MS interactor identification, co-IP with domain specificity (ZnF3-BRCT), functional DNA repair assay, mechanistic rescue with mutant; single rigorous study with multiple orthogonal methods","pmids":["39174499"],"is_preprint":false},{"year":2025,"finding":"PinX1 regulates ribosome biogenesis by binding RNA polymerase I subunit POLR1G (required for RNA pol I preinitiation complex assembly) in association with UBTF. Upon nutrient starvation, PinX1 is acetylated at multiple lysine residues (K43, K133, K140, K149, K190, K222), which disrupts its binding to POLR1G and leads to disassembly of the RNA pol I preinitiation complex, shutting down rDNA transcription.","method":"Co-immunoprecipitation (PinX1-POLR1G-UBTF), mass spectrometry identification of acetylation sites, mutagenesis of acetylation sites, rDNA transcription assay, ribosome biogenesis assay, nutrient starvation experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — co-IP defining complex, acetylation site mapping by MS with mutagenesis, functional transcription assay; single study with multiple orthogonal methods","pmids":["40639785"],"is_preprint":false},{"year":2026,"finding":"PinX1 (activated transcriptionally by TP53) binds Rab11a via its telomerase inhibitory domain (aa 252–328), recruits RanBP2 to Rab11a, and induces SUMOylation of Rab11a at K207, leading to Rab11a degradation; this impairs migrasome formation and mitochondrial transfer, reducing cisplatin resistance in nasopharyngeal carcinoma cells.","method":"Co-immunoprecipitation, immunofluorescence, ChIP (TP53 on PinX1 promoter), Rab11a SUMOylation assay, domain-mapping (TID 252–328), migrasome formation assay, cisplatin resistance assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP for complex, SUMOylation assay, domain truncation, functional resistance assay; single lab with multiple methods","pmids":["42086676"],"is_preprint":false},{"year":2025,"finding":"PINX1 promotes ILF3 ubiquitination via the E3 ligase SPOP, leading to ILF3 degradation and suppression of the PI3K-AKT-mTOR pathway; this inhibits tumor proliferation and enhances cisplatin sensitivity in nasopharyngeal carcinoma. STAT3 suppresses PINX1 transcription (confirmed by ChIP and dual-luciferase assay).","method":"Co-immunoprecipitation, ubiquitination assay, chromatin immunoprecipitation, dual-luciferase assay, western blot, cell cycle and IC50 assays","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP, ubiquitination assay, ChIP/reporter for transcriptional regulation, functional assays; single lab","pmids":["40667563"],"is_preprint":false},{"year":2004,"finding":"MCRS2 (an isoform of MCRS1/p78) interacts with LPTS/PinX1 in vitro and in vivo, co-localizes with it in cells, and inhibits telomerase activity in vitro; long-term MCRS2 overexpression causes progressive telomere shortening.","method":"Yeast two-hybrid (initial identification), co-immunoprecipitation, co-localization microscopy, in vitro telomerase inhibition assay (TRAP), stable overexpression with telomere length monitoring","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP and co-localization plus in vitro functional assay; single lab","pmids":["15044100"],"is_preprint":false},{"year":2010,"finding":"PinX1 inhibits telomerase activity in gastric cancer cells through upregulation of Mad1 and downregulation of c-Myc; PinX1 RNAi produces the opposite effect (downregulation of Mad1, upregulation of c-Myc), placing PinX1 upstream of the Mad1/c-Myc pathway in telomerase regulation.","method":"Transfection of PinX1 and PinX1-siRNA, TRAP telomerase assay, RT-PCR and western blot for Mad1/c-Myc","journal":"Journal of gastrointestinal surgery","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single set of gene expression readouts without mechanistic dissection of pathway causality","pmids":["20544396"],"is_preprint":false},{"year":2024,"finding":"PinX1 interacts with RBM10 (identified by immunoprecipitation-mass spectrometry); this interaction may assist telomerase localization to telomeres and promote telomere maintenance, thereby inhibiting immunostimulatory effects of ionizing radiation.","method":"Immunoprecipitation-mass spectrometry (for interactor identification), functional radiosensitivity assays, cGAS-STING pathway western blot","journal":"Journal of translational medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — IP-MS identification of interaction with limited mechanistic follow-up for the specific PinX1-RBM10 mechanism; single lab","pmids":["38431575"],"is_preprint":false}],"current_model":"PinX1 is a multifunctional nuclear protein that acts as a potent endogenous telomerase inhibitor by directly binding hTERT (at its hTR-binding domain) and the assembled hTERT·hTR complex via its C-terminal TID domain (aa 290–328); it is recruited to telomeres by TRF1 and is required for both telomerase inhibition in cis and for TRF1 stability, while also facilitating telomerase recruitment/localization to telomeres during S phase via interactions with NPM and POT1 complex components; in mitosis, PinX1 relocalizes to kinetochores (Hec1/CENP-E-dependent) and chromosome periphery (Nucleolin-dependent) as a microtubule-binding protein essential for faithful chromosome segregation; its stability is regulated by Plk1-mediated mitotic phosphorylation (leading to ubiquitin-proteasomal degradation) and by TERT in the nucleolus; it also activates the RNA helicase Prp43/DHX15 via its G-patch domain to drive ribosome biogenesis; binds the ZnF3-BRCT domain of PARP1 to facilitate XRCC1 recruitment and DNA repair; interacts with POLR1G/UBTF to promote RNA Pol I preinitiation complex assembly, a function inhibited by nutrient starvation-induced acetylation at multiple lysines; functions as a transcriptional corepressor of estrogen receptor alpha and coactivator of androgen receptor; and is transcriptionally regulated by p53 (activation), NF-κB/p65 (repression), and STAT3 (repression)."},"narrative":{"mechanistic_narrative":"PINX1 is a multifunctional nucleolar and telomeric protein that integrates telomerase regulation, chromosome segregation, and ribosome biogenesis [PMID:11701125, PMID:19553660, PMID:24823796]. It was first defined as a Pin2/TRF1-binding protein that directly binds the telomerase catalytic subunit hTERT through its C-terminal telomerase inhibitory domain (TID, residues 290–328) and potently inhibits telomerase activity, shortening telomeres when overexpressed and elongating them when depleted [PMID:11701125, PMID:20620128]; binding extends to the assembled hTERT·hTR complex via the hTR-binding domain of hTERT [PMID:15381700]. PINX1 is recruited to telomeres by TRF1 through a minimal sequence requiring Leu-291, an interaction needed for telomere localization and for inhibition of telomere elongation in cis [PMID:21119197], and it reciprocally stabilizes TRF1 against ubiquitin-mediated degradation, with loss of PINX1 triggering telomere DNA damage responses and chromosome instability [PMID:24415760]. Beyond inhibition, PINX1 has a positive role in telomerase recruitment, promoting telomerase association with the POT1 complex and with hTERT during S phase, acting in part as a linker that brings nucleophosmin (NPM) into a ternary complex with hTERT [PMID:19117989, PMID:22749911, PMID:28255170, PMID:31210926]. In mitosis, PINX1 is a microtubule-binding protein that relocalizes to the outer kinetochore (Hec1/CENP-E-dependent) and chromosome periphery (Nucleolin-dependent), where it is essential for chromosome congression and faithful segregation [PMID:19553660, PMID:19393617]; its mitotic stability is controlled by Plk1-mediated phosphorylation that drives proteasomal degradation [PMID:20573420]. In the nucleolus, PINX1 activates the DEAH-box RNA helicase Prp43/DHX15 through its G-patch domain to stimulate ATPase activity and drive ribosomal subunit maturation [PMID:24823796, PMID:32882145], and it promotes RNA polymerase I preinitiation complex assembly via POLR1G/UBTF, a function shut down by nutrient-starvation-induced lysine acetylation [PMID:40639785]. PINX1 also functions in DNA repair, binding the ZnF3-BRCT domain of PARP1 to facilitate XRCC1 recruitment independently of its telomerase activity [PMID:39174499]. Genetic studies establish PINX1 as a haploinsufficient tumor suppressor: heterozygous mice develop telomerase-dependent chromosomal instability and spontaneous tumors, while nullizygosity is embryonic lethal [PMID:21436583]. PINX1 expression is transcriptionally activated by p53 and repressed by NF-κB/p65 and STAT3 [PMID:24412852, PMID:29017500, PMID:40667563].","teleology":[{"year":2001,"claim":"Established PINX1 as a direct, endogenous telomerase inhibitor, answering whether a TRF1-associated factor could regulate telomerase catalytic activity.","evidence":"Co-IP, in vitro TRAP telomerase assay, overexpression/RNAi, and xenograft assay in human cells","pmids":["11701125"],"confidence":"High","gaps":["Did not resolve which hTERT domain is bound","Did not address PINX1 functions outside telomerase"]},{"year":2002,"claim":"Revealed a conserved second function in rRNA/snoRNA maturation via the G-patch domain, showing PINX1 is not solely a telomere factor.","evidence":"Yeast GNO1 deletion, complementation with human PINX1, Northern blot, G-patch mutagenesis","pmids":["12107183"],"confidence":"High","gaps":["Molecular target of the G-patch domain not identified at this stage","Link between nucleolar and telomeric functions unresolved"]},{"year":2004,"claim":"Defined the binding mode by which PINX1 represses telomerase, showing it engages the hTR-binding domain of hTERT and the assembled hTERT·hTR complex.","evidence":"In vitro pulldown and cellular co-IP with hTERT/hTR depletion controls","pmids":["15381700"],"confidence":"High","gaps":["Structural basis of complex binding not determined"]},{"year":2004,"claim":"Identified MCRS2 as an additional PINX1-associated telomerase inhibitor, expanding the inhibitory protein network.","evidence":"Yeast two-hybrid, co-IP, co-localization, in vitro TRAP, stable overexpression telomere monitoring","pmids":["15044100"],"confidence":"Medium","gaps":["Mechanism of MCRS2 contribution to telomerase inhibition not dissected","In vivo relevance unaddressed"]},{"year":2009,"claim":"Discovered a mitotic role: PINX1 is a microtubule-binding protein at kinetochores and chromosome periphery essential for faithful segregation, distinct from telomerase regulation.","evidence":"Deconvolution and live imaging, biochemical microtubule binding, siRNA, deletion mapping","pmids":["19553660"],"confidence":"High","gaps":["Direct microtubule-binding interface not mapped at residue level","Mechanistic link to its interphase telomere role unclear"]},{"year":2009,"claim":"Identified Nucleolin as the recruiter of PINX1 to the chromosome periphery, defining how PINX1 supports chromosome congression in mitosis.","evidence":"Reciprocal co-IP, deconvolution microscopy, Nucleolin siRNA, live mitosis imaging","pmids":["19393617"],"confidence":"Medium","gaps":["Single lab","How Nucleolin and kinetochore recruitment pathways coordinate not resolved"]},{"year":2009,"claim":"Showed PINX1 has a positive role in telomerase recruitment, reconciling inhibitory and recruitment functions.","evidence":"shRNA knockdown, telomere length analysis, co-IP of telomerase with POT1 complex","pmids":["19117989"],"confidence":"Medium","gaps":["Molecular basis of the switch between inhibition and recruitment not defined","Two methods, single lab"]},{"year":2009,"claim":"Demonstrated PINX1 controls TRF1 nucleolar accumulation and telomere binding, with the C-terminus required for nucleolar localization.","evidence":"Co-localization, deletion-mutant overexpression, TRF1 telomere analysis, fibrillarin co-staining","pmids":["19265708"],"confidence":"Medium","gaps":["Mechanism of forced TRF1 redistribution unclear","Physiological versus overexpression context not separated"]},{"year":2010,"claim":"Mapped the functional domains: residues 290–328 constitute the TID binding hTERT, and 254–289 binds Pin2/TRF1, separating telomere targeting from telomerase inhibition.","evidence":"Domain-mapping pulldowns, in vitro TRAP with truncation mutants, telomere length analysis","pmids":["20620128"],"confidence":"Medium","gaps":["Single lab","Structural detail of domain–partner contacts absent"]},{"year":2010,"claim":"Defined TRF1 as the recruiter of PINX1 to telomeres, with Leu-291 essential, linking localization to inhibition of telomere elongation in cis.","evidence":"Leu-291 mutagenesis, TRF1 RNAi epistasis, telomere length and telomerase activity assays, co-IP","pmids":["21119197"],"confidence":"High","gaps":["How telomere recruitment couples to catalytic inhibition mechanistically not fully resolved"]},{"year":2010,"claim":"Established Plk1 as a negative regulator of PINX1 stability through mitotic phosphorylation-driven proteasomal degradation.","evidence":"Co-IP, in vitro kinase assay, phosphosite mutagenesis, proteasome inhibitor, knockdown/overexpression","pmids":["20573420"],"confidence":"High","gaps":["E3 ligase mediating degradation not identified","Functional consequence for segregation not directly tied to phosphosites"]},{"year":2011,"claim":"Provided in vivo proof that PINX1 is a haploinsufficient tumor suppressor required for chromosome stability and telomerase control.","evidence":"PINX1 knockout/heterozygous mouse model, MEF telomerase assay, cytogenetics, tumor histopathology, p53 epistasis","pmids":["21436583"],"confidence":"High","gaps":["Tissue-specific contributions not dissected","Relative weight of telomere versus mitotic functions in tumorigenesis unclear"]},{"year":2012,"claim":"Showed endogenous PINX1 acts at telomeres primarily in mitosis, stabilizing TRF1 and promoting timely M-phase entry.","evidence":"Telomere ChIP, siRNA knockdown, cell cycle analysis","pmids":["22331467"],"confidence":"Medium","gaps":["Single lab","Mechanism connecting TRF1 stabilization to mitotic entry not defined"]},{"year":2012,"claim":"Demonstrated PINX1 directs cell-cycle-dependent trafficking of hTERT to telomeres in S phase and chromosomes in anaphase.","evidence":"Immunofluorescence co-localization, siRNA, cell-cycle synchronization","pmids":["22749911"],"confidence":"Medium","gaps":["Trafficking machinery used by PINX1 not identified","Localization data without biochemical mechanism"]},{"year":2014,"claim":"Resolved the PINX1–TRF1–hTERT regulatory circuit, showing PINX1 stabilizes TRF1 and that hTERT plays dual roles in this stability pathway.","evidence":"siRNA, co-IP, ubiquitination assay, TIF assay, cytogenetics, ectopic hTERT, hTERT co-knockdown epistasis","pmids":["24415760"],"confidence":"High","gaps":["Mechanism by which hTERT both supports and antagonizes TRF1 stability not fully explained"]},{"year":2014,"claim":"Identified p53 as a direct transcriptional activator of PINX1 and showed HPV16 E6 suppresses PINX1 by inhibiting p53, linking PINX1 regulation to viral oncogenesis.","evidence":"ChIP, luciferase reporter, p53 overexpression/knockdown, E6 expression, TRAP","pmids":["24412852"],"confidence":"Medium","gaps":["Single lab","Other transcriptional inputs not assessed here"]},{"year":2014,"claim":"Defined PINX1 as a direct activator of the Prp43/DHX15 helicase through its G-patch domain, mechanistically explaining its ribosome biogenesis role.","evidence":"In vitro ATPase stimulation, co-IP (yeast and human), G-patch mutagenesis, sucrose gradient ribosome analysis","pmids":["24823796"],"confidence":"High","gaps":["Structural basis of G-patch–Prp43 engagement addressed only later","Human cellular ribosome phenotype not fully quantified"]},{"year":2015,"claim":"Showed PINX1 represses ERα as a transcriptional corepressor, extending its role to nuclear receptor signaling.","evidence":"Co-IP, ChIP on E2-regulated promoters, AF-1/AF-2 reporter assays, ERα domain mapping","pmids":["26187699"],"confidence":"Medium","gaps":["Corepressor mechanism (recruited complexes) not defined","Single lab"]},{"year":2015,"claim":"Identified PINX1 suppression of MMP-9 via NF-κB as a basis for inhibiting breast cancer migration and invasion.","evidence":"siRNA/overexpression, zymography, NF-κB reporter, tail-vein metastasis model","pmids":["25888829"],"confidence":"Medium","gaps":["Direct molecular target in the NF-κB axis not identified","Single lab"]},{"year":2015,"claim":"Established TERT as a stabilizer of nucleolar PINX1, defining a reciprocal protein-stability relationship specific to the C-terminal fragment.","evidence":"TERT siRNA/overexpression, cycloheximide chase with truncation mutants","pmids":["26194824"],"confidence":"Medium","gaps":["Mechanism of TERT-mediated stabilization unknown","Single lab"]},{"year":2017,"claim":"Showed PINX1 links NPM to hTERT, with NPM recruitment partially attenuating PINX1's telomerase inhibition.","evidence":"Co-IP, direct binding assay, TRAP, domain mapping","pmids":["28255170"],"confidence":"Medium","gaps":["Quantitative balance of inhibition versus attenuation not defined","Single lab"]},{"year":2017,"claim":"Defined NF-κB p65 as a direct transcriptional repressor binding two promoter response elements of PINX1.","evidence":"EMSA, ChIP, promoter-reporter with site-directed mutagenesis","pmids":["29017500"],"confidence":"Medium","gaps":["Upstream signals controlling p65 occupancy not addressed here"]},{"year":2017,"claim":"Revealed PINX1 as an EV71 3C protease substrate, cleaved at Q50–G51 to promote apoptosis and viral release, identifying a host-pathogen vulnerability.","evidence":"Co-IP, in vitro cleavage assay, overexpression/siRNA, apoptosis and viral release assays","pmids":["27847364"],"confidence":"Medium","gaps":["Consequences of cleavage for PINX1's other functions not mapped","Single lab"]},{"year":2019,"claim":"Showed PINX1 represses tumor angiogenesis by transcriptionally activating miR-125a-3p to suppress VEGF.","evidence":"miRNA microarray, ChIP, luciferase reporter, siRNA, angiogenesis assay, xenograft","pmids":["31254127"],"confidence":"Medium","gaps":["How a telomerase regulator acts as a direct transcriptional activator mechanistically unclear","Single lab"]},{"year":2019,"claim":"Refined the cell-cycle timing of the NPM/PINX1/hTERT ternary complex to early S phase, tying it to telomere extension.","evidence":"Immunofluorescence, synchronization, co-IP, TRF telomere assay","pmids":["31210926"],"confidence":"Medium","gaps":["Single lab","Causal contribution of complex timing to net telomerase output not isolated"]},{"year":2019,"claim":"Showed EBV LMP1 represses PINX1 by enhancing NF-κB p65 promoter binding, increasing telomerase activity, connecting viral oncogenesis to PINX1 control.","evidence":"ChIP, dual-luciferase reporter, LMP1 overexpression, TRAP, Southern blot","pmids":["31027734"],"confidence":"Medium","gaps":["Single lab","Direct versus indirect effect of LMP1 on p65 not fully separated"]},{"year":2020,"claim":"Defined distinct structural binding modes of PINX1 versus Pfa1 G-patches to Prp43 while showing both require the OB-fold β4–β5 loop for ATPase/helicase stimulation.","evidence":"In vitro ATPase and helicase assays, Prp43 loop mutants in yeast, co-IP, ribosome biogenesis analysis","pmids":["32882145"],"confidence":"High","gaps":["Full structural model of human PINX1–DHX15 complex not solved","Functional impact in human cells not directly tested"]},{"year":2024,"claim":"Identified a telomerase-independent DNA repair function: PINX1 binds the PARP1 ZnF3-BRCT domain to promote PARP1-chromatin loading and XRCC1 recruitment.","evidence":"IP-MS, co-IP with domain specificity, chromatin fractionation, γH2AX assays, rescue with telomerase-inhibitory mutant","pmids":["39174499"],"confidence":"High","gaps":["Which DNA repair pathways depend on PINX1 not fully mapped","Structural detail of PARP1 interaction absent"]},{"year":2024,"claim":"Reported PINX1 interaction with RBM10 as a possible contributor to telomere maintenance modulating radiation immunostimulation.","evidence":"IP-MS interactor identification, radiosensitivity assays, cGAS-STING western blot","pmids":["38431575"],"confidence":"Low","gaps":["IP-MS identification with limited mechanistic follow-up for the specific PINX1-RBM10 mechanism","Causality of telomere effect not established","Single lab"]},{"year":2025,"claim":"Defined PINX1's role in RNA Pol I preinitiation complex assembly via POLR1G/UBTF and showed nutrient-starvation acetylation disrupts this to shut down rDNA transcription.","evidence":"Co-IP (PINX1-POLR1G-UBTF), MS acetylation site mapping, acetyl-site mutagenesis, rDNA transcription and ribosome biogenesis assays","pmids":["40639785"],"confidence":"High","gaps":["Acetyltransferase/deacetylase enzymes not identified","Integration with the DHX15 ribosome function not resolved"]},{"year":2025,"claim":"Showed PINX1 promotes SPOP-mediated ILF3 ubiquitination to suppress PI3K-AKT-mTOR signaling and enhance cisplatin sensitivity, with STAT3 repressing PINX1 transcription.","evidence":"Co-IP, ubiquitination assay, ChIP, dual-luciferase, cell cycle and IC50 assays","pmids":["40667563"],"confidence":"Medium","gaps":["Whether PINX1 acts directly in the ubiquitination complex unclear","Single lab"]},{"year":2026,"claim":"Reported a TID-dependent PINX1–Rab11a–RanBP2 axis driving Rab11a SUMOylation and degradation to impair migrasome formation and reduce cisplatin resistance.","evidence":"Co-IP, immunofluorescence, ChIP (TP53 on promoter), Rab11a SUMOylation assay, domain mapping, migrasome and resistance assays","pmids":["42086676"],"confidence":"Medium","gaps":["Whether PINX1 directly catalyzes or scaffolds SUMOylation unclear","Single lab","Generalizability beyond nasopharyngeal carcinoma untested"]},{"year":null,"claim":"How PINX1's many functions—telomerase regulation, kinetochore/microtubule binding, RNA Pol I and DHX15-driven ribosome biogenesis, DNA repair, and nuclear receptor coregulation—are coordinated within one protein and partitioned across cell-cycle phases and subcellular compartments remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying structural model integrating the TID, G-patch, and TRF1-binding domains","No comprehensive map of which functions dominate in physiological versus disease contexts","Regulatory hierarchy among p53, NF-κB, and STAT3 transcriptional inputs not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,10,15,24]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[3]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[17,21,29]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[18,28,29]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[1,3,6,27]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,27]},{"term_id":"GO:0005694","term_label":"chromosome","supporting_discovery_ids":[3,5,7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,15,24,29]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[3,5,11]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[28]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[17,29]}],"complexes":["telomerase (hTERT·hTR) complex","RNA polymerase I preinitiation complex","kinetochore"],"partners":["TERT","TRF1","NPM","DHX15","PARP1","POLR1G","UBTF","POT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96BK5","full_name":"PIN2/TERF1-interacting telomerase inhibitor 1","aliases":["Liver-related putative tumor suppressor","Pin2-interacting protein X1","Protein 67-11-3","TRF1-interacting protein 1"],"length_aa":328,"mass_kda":37.0,"function":"Microtubule-binding protein essential for faithful chromosome segregation. Mediates TRF1 and TERT accumulation in nucleolus and enhances TRF1 binding to telomeres. Inhibits telomerase activity. May inhibit cell proliferation and act as tumor suppressor","subcellular_location":"Nucleus; Nucleus, nucleolus; Chromosome, telomere; Chromosome, centromere, kinetochore","url":"https://www.uniprot.org/uniprotkb/Q96BK5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PINX1","classification":"Not Classified","n_dependent_lines":39,"n_total_lines":1208,"dependency_fraction":0.03228476821192053},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PINX1","total_profiled":1310},"omim":[{"mim_id":"609504","title":"MICROSPHERULE PROTEIN 1; MCRS1","url":"https://www.omim.org/entry/609504"},{"mim_id":"606505","title":"PIN2-INTERACTING PROTEIN 1; PINX1","url":"https://www.omim.org/entry/606505"},{"mim_id":"606478","title":"PROTECTION OF TELOMERES 1; POT1","url":"https://www.omim.org/entry/606478"},{"mim_id":"604319","title":"TERF1-INTERACTING NUCLEAR FACTOR 2; TINF2","url":"https://www.omim.org/entry/604319"},{"mim_id":"602027","title":"TELOMERIC REPEAT-BINDING FACTOR 2; TERF2","url":"https://www.omim.org/entry/602027"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"cervix","ntpm":1.6},{"tissue":"vagina","ntpm":4.6}],"url":"https://www.proteinatlas.org/search/PINX1"},"hgnc":{"alias_symbol":["LPTL","LPTS","FLJ20565","MGC8850","Gno1","Pxr1"],"prev_symbol":[]},"alphafold":{"accession":"Q96BK5","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96BK5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96BK5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96BK5-F1-predicted_aligned_error_v6.png","plddt_mean":64.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PINX1","jax_strain_url":"https://www.jax.org/strain/search?query=PINX1"},"sequence":{"accession":"Q96BK5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96BK5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96BK5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96BK5"}},"corpus_meta":[{"pmid":"11701125","id":"PMC_11701125","title":"The Pin2/TRF1-interacting protein PinX1 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chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19553660","citation_count":43,"is_preprint":false},{"pmid":"24823796","id":"PMC_24823796","title":"The telomerase inhibitor Gno1p/PINX1 activates the helicase Prp43p during ribosome biogenesis.","date":"2014","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/24823796","citation_count":43,"is_preprint":false},{"pmid":"31254127","id":"PMC_31254127","title":"PinX1 represses renal cancer angiogenesis via the mir-125a-3p/VEGF signaling pathway.","date":"2019","source":"Angiogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/31254127","citation_count":39,"is_preprint":false},{"pmid":"21643006","id":"PMC_21643006","title":"Anthracyclines disrupt telomere maintenance by telomerase through inducing PinX1 ubiquitination and degradation.","date":"2011","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/21643006","citation_count":37,"is_preprint":false},{"pmid":"21119197","id":"PMC_21119197","title":"Telomerase inhibitor PinX1 provides a link between TRF1 and telomerase to prevent telomere elongation.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21119197","citation_count":36,"is_preprint":false},{"pmid":"15637589","id":"PMC_15637589","title":"Loss of heterozygosity and histone hypoacetylation of the PINX1 gene are associated with reduced expression in gastric carcinoma.","date":"2005","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/15637589","citation_count":35,"is_preprint":false},{"pmid":"27847364","id":"PMC_27847364","title":"Enterovirus 71 3C Promotes Apoptosis through Cleavage of PinX1, a Telomere Binding Protein.","date":"2017","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/27847364","citation_count":35,"is_preprint":false},{"pmid":"15044100","id":"PMC_15044100","title":"Human MCRS2, a cell-cycle-dependent protein, associates with LPTS/PinX1 and reduces the telomere 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the radiotherapy effect of oesophageal squamous cell carcinomas.","date":"2013","source":"The Journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/23341363","citation_count":31,"is_preprint":false},{"pmid":"22316341","id":"PMC_22316341","title":"PinX1 regulation of telomerase activity and apoptosis in nasopharyngeal carcinoma cells.","date":"2012","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/22316341","citation_count":30,"is_preprint":false},{"pmid":"11867205","id":"PMC_11867205","title":"Genetic analysis of the liver putative tumor suppressor (LPTS) gene in hepatocellular carcinomas.","date":"2002","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/11867205","citation_count":29,"is_preprint":false},{"pmid":"25045845","id":"PMC_25045845","title":"The telomere/telomerase binding factor PinX1 regulates paclitaxel sensitivity depending on spindle assembly checkpoint in human cervical squamous cell 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Burkitt's lymphoma cells by mBAFF-targeted delivery of PinX1.","date":"2010","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/21102426","citation_count":20,"is_preprint":false},{"pmid":"20544396","id":"PMC_20544396","title":"PinX1 inhibits telomerase activity in gastric cancer cells through Mad1/c-Myc pathway.","date":"2010","source":"Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract","url":"https://pubmed.ncbi.nlm.nih.gov/20544396","citation_count":20,"is_preprint":false},{"pmid":"18784941","id":"PMC_18784941","title":"The correlation of genetic instability of PINX1 gene to clinico-pathological features of gastric cancer in the Chinese population.","date":"2008","source":"Journal of cancer research and clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/18784941","citation_count":20,"is_preprint":false},{"pmid":"15264240","id":"PMC_15264240","title":"Mutational analysis of PINX1 in hereditary prostate 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Overexpression inhibits telomerase, shortens telomeres, and induces crisis; depletion increases telomerase activity and elongates telomeres.\",\n      \"method\": \"Co-immunoprecipitation, in vitro telomerase inhibition assay (TRAP), overexpression and RNAi depletion in human cells, xenograft tumorigenicity assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution of telomerase inhibition, reciprocal binding assays, functional rescue experiments, replicated by multiple subsequent studies\",\n      \"pmids\": [\"11701125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The yeast homolog of PinX1 (Gno1p) is involved in rRNA and snoRNA maturation; its G-patch domain is essential for both rRNA processing and snoRNA maturation. PinX1 complements the gno1Δ mutation, indicating a conserved dual function in telomere regulation and rRNA maturation consistent with its nucleolar localization.\",\n      \"method\": \"Yeast genetics (GNO1 deletion), complementation assay with human PinX1, Northern blot, mutational analysis of G-patch domain\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic deletion, domain mutagenesis, complementation, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"12107183\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PinX1 binds directly to hTERT protein (primarily to its hTR-binding domain) in vitro, and also associates with hTR in a cellular context dependent on hTERT presence, suggesting PinX1 represses telomerase by binding the assembled hTERT·hTR complex.\",\n      \"method\": \"In vitro binding assays (pulldown), co-immunoprecipitation in cells with hTERT/hTR depletion controls\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro direct binding assay plus cellular co-IP with mechanistic dissection of complex dependency, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"15381700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PinX1 is a novel microtubule-binding protein that localizes to nucleoli and telomeres in interphase and relocalizes to chromosome periphery and the outer kinetochore plate in mitosis. Kinetochore localization depends on Hec1 and CENP-E. Depletion by siRNA causes anaphase chromatid bridges and micronuclei, demonstrating an essential role in faithful chromosome segregation.\",\n      \"method\": \"Deconvolution microscopy, deletion mapping, siRNA knockdown, real-time imaging, biochemical microtubule-binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (live imaging, biochemical binding, genetic knockdown with defined phenotype, domain mapping), single rigorous study\",\n      \"pmids\": [\"19553660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Silencing PinX1 in telomerase-positive cancer cells causes robust telomere shortening and reduces the endogenous association of telomerase with the POT1-containing telomeric protein complex, revealing a positive role for PinX1 in telomerase recruitment to telomeres.\",\n      \"method\": \"shRNA knockdown, telomere length analysis, co-immunoprecipitation of telomerase with POT1 complex\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal co-IP with functional telomere phenotype, single lab, two methods\",\n      \"pmids\": [\"19117989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PinX1 interacts with Nucleolin at chromosome periphery via its C-terminus; Nucleolin depletion abolishes PinX1 chromosome-periphery localization, and co-depletion of both proteins abrogates chromosome congression, indicating PinX1 is recruited to chromosome periphery by Nucleolin to facilitate chromosome congression.\",\n      \"method\": \"Co-immunoprecipitation, deconvolution microscopy, siRNA depletion of Nucleolin, real-time mitosis imaging\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal co-IP, epistasis-style localization rescue, live imaging, single lab\",\n      \"pmids\": [\"19393617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PinX1 regulates nucleolar accumulation and telomeric association of TRF1: overexpressed PinX1 forces endogenous TRF1 into the nucleolus and upregulates TRF1 binding to telomeres; the C-terminal region of PinX1 is required for nucleolar localization.\",\n      \"method\": \"Co-localization studies, overexpression of deletion mutants, TRF1 telomere ChIP-like analysis, fibrillarin co-staining\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — localization with functional consequence (TRF1 redistribution), domain mapping, single lab\",\n      \"pmids\": [\"19265708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PinX1 is recruited to telomeres by TRF1 via the TRF homology domain of TRF1 interacting with a minimal 20-amino-acid sequence of PinX1; disrupting this interaction by mutating Leu-291 of PinX1 or knocking down TRF1 abolishes telomere localization of PinX1 and its ability to inhibit telomere elongation, without affecting telomerase activity per se.\",\n      \"method\": \"Mutagenesis (Leu-291 substitution), RNAi of TRF1, telomere length assay, telomerase activity assay, co-immunoprecipitation, domain-mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — site-directed mutagenesis + RNAi epistasis + functional telomere assay, multiple orthogonal methods, mechanistically rigorous\",\n      \"pmids\": [\"21119197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Polo-like kinase 1 (Plk1) interacts with PinX1 and phosphorylates it at five sites in mitosis; Plk1 overexpression promotes PinX1 proteasomal degradation dependent on ubiquitin, while Plk1 depletion increases PinX1 stability, establishing Plk1 as a negative regulator of PinX1 stability via mitotic phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, overexpression/siRNA depletion, proteasome inhibitor treatment, phosphosite mutagenesis\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay, mutagenesis of phosphosites, co-IP, degradation assay with controls; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20573420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Anthracyclines downregulate PinX1 protein through the ubiquitin-proteasome pathway, thereby disrupting PinX1-mediated telomerase recruitment to telomeres and causing telomere dysfunction specifically in telomerase-positive cancer cells.\",\n      \"method\": \"Western blot, ubiquitination assay, proteasome inhibitor rescue, telomerase association assay (co-IP), telomere dysfunction assays in cancer cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ubiquitination assay with proteasome rescue, functional telomerase localization assay, single lab with two orthogonal methods\",\n      \"pmids\": [\"21643006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The C-terminal fragment of LPTS/PinX1 (residues 290–328) is the telomerase inhibitory domain (TID) that directly associates with hTERT and shows stronger in vitro telomerase inhibitory activity than full-length protein; residues 254–289 mediate binding to Pin2/TRF1; overexpression of 290–328 shortens telomeres while expression of dominant-negative 1–289 elongates them.\",\n      \"method\": \"Domain-mapping pulldowns, in vitro TRAP telomerase assay with truncation mutants, overexpression of fragments in cells with telomere length analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro telomerase inhibition reconstitution with defined domain, functional cell assays; single lab\",\n      \"pmids\": [\"20620128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PinX1 heterozygosity in mice activates telomerase and leads to telomerase-dependent chromosomal instability; PinX1-null mice are embryonic lethal; most PinX1+/- mice spontaneously develop malignant tumors with chromosome instability, establishing PinX1 as a haploinsufficient tumor suppressor essential for chromosome stability.\",\n      \"method\": \"PinX1 knockout/heterozygous mouse model, MEF telomerase activity assay, cytogenetic chromosome instability analysis, tumor histopathology, p53 mutant epistasis cross\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo genetic mouse model, multiple orthogonal phenotypic readouts (telomerase activity, chromosomal instability, tumor development), epistasis with p53\",\n      \"pmids\": [\"21436583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Endogenous PinX1 associates with telomeres primarily at mitosis; knockdown of PinX1 causes delayed mitotic entry and reduces accumulation of TRF1 on telomeres during mitosis, indicating PinX1 stabilizes TRF1 at mitosis to promote M phase entry.\",\n      \"method\": \"Chromatin immunoprecipitation (telomere ChIP), siRNA knockdown, cell cycle analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — endogenous telomere ChIP, functional knockdown phenotype, cell-cycle analysis; single lab\",\n      \"pmids\": [\"22331467\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PinX1 is involved in cell-cycle-dependent trafficking of hTERT to telomeres during mid-late S phase; PinX1 silencing reduces telomerase localization to telomeres and also mediates chromosomal localization of hTERT during anaphase.\",\n      \"method\": \"Immunofluorescence co-localization, siRNA silencing, cell-cycle synchronization\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — fluorescence localization with siRNA perturbation, cell cycle staging; single lab\",\n      \"pmids\": [\"22749911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PinX1 overexpression stabilizes TRF1 protein; PinX1 depletion leads to TRF1 ubiquitination and degradation and reduced TRF1 telomere association, causing DNA damage responses at telomeres and chromosome instability. hTERT plays dual roles in this pathway: it is required for PinX1-mediated TRF1 stability, yet co-knockdown of PinX1 and hTERT restores TRF1 stability and suppresses chromosome instability.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, ubiquitination assay, telomere dysfunction-induced foci (TIF) assay, cytogenetics, ectopic hTERT expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (ubiquitination assay, co-IP, cytogenetics, epistasis with hTERT knockdown), single rigorous study\",\n      \"pmids\": [\"24415760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Gno1p and human PINX1 activate the DEAH-box RNA helicase Prp43p (human DHX15) via their G-patch domain, stimulating its ATPase activity in vitro; this interaction is required for maturation of pre-40S and pre-60S ribosomal particles in yeast. PINX1 interacts with human PRP43/DHX15 in HeLa cells.\",\n      \"method\": \"In vitro ATPase stimulation assay, co-immunoprecipitation (yeast and human cells), G-patch mutagenesis, ribosome biogenesis analysis (sucrose gradient sedimentation)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical reconstitution of ATPase stimulation, G-patch mutagenesis, complementation genetics, cellular co-IP; multiple orthogonal methods\",\n      \"pmids\": [\"24823796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PinX1 inhibits breast cancer cell migration and invasion by suppressing MMP-9 expression and activity via NF-κB-dependent transcription.\",\n      \"method\": \"siRNA/overexpression in breast cancer cells, gelatin zymography, western blot, NF-κB reporter assay, nude mouse tail-vein metastasis model\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — NF-κB reporter assay plus functional migration/invasion assays, in vivo model; single lab\",\n      \"pmids\": [\"25888829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PINX1 interacts with the N-terminal domain of estrogen receptor alpha (ERα) and functions as a transcriptional corepressor, repressing both AF-1 and AF-2 transcriptional activities; ChIP assays confirmed the ERα-PINX1 interaction on E2-regulated promoters.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), reporter assay (AF-1/AF-2 activity), ERα domain mapping, proliferation assays\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP, ChIP, reporter assay; single lab with multiple methods\",\n      \"pmids\": [\"26187699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Nucleophosmin (NPM) directly interacts with PinX1; PinX1 acts as a linker between NPM and hTERT, and NPM recruitment to the telomerase complex by PinX1 partially attenuates PinX1-mediated telomerase inhibition.\",\n      \"method\": \"Co-immunoprecipitation, direct binding assay, telomerase activity assay (TRAP), domain mapping\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP of endogenous proteins, functional telomerase activity assay, single lab\",\n      \"pmids\": [\"28255170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"EV71 viral protease 3C directly interacts with PinX1 and cleaves it at the Q50–G51 site via its protease activity; this cleavage promotes host cell apoptosis and facilitates EV71 release.\",\n      \"method\": \"Co-immunoprecipitation of 3C and PinX1, in vitro cleavage assay with 3C protease, overexpression/siRNA, apoptosis assay, viral release measurement\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro cleavage with defined cleavage site, co-IP, functional loss-of-function; single lab\",\n      \"pmids\": [\"27847364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NF-κB p65 directly binds two consensus response elements in the LPTS/PinX1 promoter (at −1143/−1136 and −888/−881) and transcriptionally represses LPTS/PinX1 expression; mutation of both sites rescues p65-suppressed promoter activity.\",\n      \"method\": \"EMSA (electrophoretic mobility shift assay), chromatin immunoprecipitation (ChIP), promoter-reporter assay with site-directed mutagenesis\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA, ChIP, mutagenesis of binding sites; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"29017500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PinX1 transcriptionally activates miR-125a-3p expression, which in turn inhibits VEGF (a miR-125a-3p target), thereby repressing tumor angiogenesis in renal cell carcinoma; ChIP and luciferase reporter assays confirmed the transcriptional mechanism.\",\n      \"method\": \"miRNA microarray, chromatin immunoprecipitation (ChIP), luciferase reporter assay, siRNA, in vitro angiogenesis assay, xenograft model\",\n      \"journal\": \"Angiogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP and luciferase reporter validate transcriptional activation, functional assays, single lab\",\n      \"pmids\": [\"31254127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The PinX1/NPM interaction peaks during early S phase; NPM localization in the nucleolus during S phase requires PinX1, and the NPM/PinX1/hTERT ternary complex forms predominantly in early S phase, facilitating telomerase activation when telomere extension occurs.\",\n      \"method\": \"Immunofluorescence co-localization, cell cycle synchronization, co-immunoprecipitation, telomere length assay (TRF assay)\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP in synchronized cells, fluorescence localization, functional telomere assay; single lab\",\n      \"pmids\": [\"31210926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"EBV LMP1 inhibits PINX1 transcription by promoting binding of NF-κB p65 to three specific sites in the PINX1 promoter, resulting in increased telomerase activity and telomere elongation.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), dual-luciferase reporter assay, LMP1 overexpression, TRAP telomerase assay, Southern blot for telomere length\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP and reporter assay with LMP1 mechanistic dissection; single lab\",\n      \"pmids\": [\"31027734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The G-patch binding modes of Pfa1 and PINX1 to Prp43 are distinct: a protruding β4–β5 loop of Prp43 OB fold is required for Pfa1 G-patch binding but not for PINX1 binding. However, this same loop is essential for stimulation of Prp43 ATPase and helicase activities by both proteins and for Prp43 function in ribosome biogenesis.\",\n      \"method\": \"In vitro ATPase assay, helicase assay, yeast genetics (Prp43 loop mutants), co-immunoprecipitation, ribosome biogenesis analysis\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic reconstitution, mutagenesis, genetic yeast model, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"32882145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PinX1 regulates TRF1 stability in a PinX1-telomere binding manner: the LPTS/PinX1(254–289) fragment binds Pin2/TRF1 while LPTS/PinX1(290–328) binds hTERT; Pin2/TRF1 interaction recruits PinX1 to telomeres.\",\n      \"method\": \"Domain deletion analysis, co-immunoprecipitation, in vitro telomerase inhibition assay, cellular telomere length analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro domain binding assays and telomerase inhibition, single lab\",\n      \"pmids\": [\"20620128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"p53 functions as a transcriptional activator of PinX1 expression by directly binding the PinX1 promoter; HPV16 E6 suppresses PinX1 expression by inhibiting p53 transcriptional activity, thereby enhancing telomerase activity.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, p53 overexpression/knockdown, E6 expression, TRAP telomerase assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — ChIP and reporter assay with mechanistic dissection; single lab\",\n      \"pmids\": [\"24412852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TERT stabilizes nucleolar PinX1 protein: PinX1 stability is reduced in TERT-depleted cells and increased in TERT-overexpressing cells; this effect is specific to the C-terminal nucleolar fragment PinX1(205–328) that binds TERT, not the N-terminal nuclear fragment.\",\n      \"method\": \"TERT siRNA knockdown and overexpression, protein stability assays (cycloheximide chase) with truncation mutants\",\n      \"journal\": \"Molecules and cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — protein stability assay with domain truncation analysis and TERT perturbation, single lab\",\n      \"pmids\": [\"26194824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PINX1 is an uncharacterized PARP1-interacting protein: it binds to the ZnF3-BRCT domain of PARP1, promotes PARP1-chromatin association, and facilitates downstream recruitment of the DNA repair factor XRCC1. Loss of PINX1 compromises DNA damage repair capacity, and this vulnerability is independent of its telomerase inhibitory activity.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (for interactor identification), co-immunoprecipitation, chromatin fractionation, DNA damage assays (γH2AX), rescue with telomerase-inhibitory mutant PINX1, XRCC1 recruitment assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — IP-MS interactor identification, co-IP with domain specificity (ZnF3-BRCT), functional DNA repair assay, mechanistic rescue with mutant; single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"39174499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PinX1 regulates ribosome biogenesis by binding RNA polymerase I subunit POLR1G (required for RNA pol I preinitiation complex assembly) in association with UBTF. Upon nutrient starvation, PinX1 is acetylated at multiple lysine residues (K43, K133, K140, K149, K190, K222), which disrupts its binding to POLR1G and leads to disassembly of the RNA pol I preinitiation complex, shutting down rDNA transcription.\",\n      \"method\": \"Co-immunoprecipitation (PinX1-POLR1G-UBTF), mass spectrometry identification of acetylation sites, mutagenesis of acetylation sites, rDNA transcription assay, ribosome biogenesis assay, nutrient starvation experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — co-IP defining complex, acetylation site mapping by MS with mutagenesis, functional transcription assay; single study with multiple orthogonal methods\",\n      \"pmids\": [\"40639785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"PinX1 (activated transcriptionally by TP53) binds Rab11a via its telomerase inhibitory domain (aa 252–328), recruits RanBP2 to Rab11a, and induces SUMOylation of Rab11a at K207, leading to Rab11a degradation; this impairs migrasome formation and mitochondrial transfer, reducing cisplatin resistance in nasopharyngeal carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, ChIP (TP53 on PinX1 promoter), Rab11a SUMOylation assay, domain-mapping (TID 252–328), migrasome formation assay, cisplatin resistance assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP for complex, SUMOylation assay, domain truncation, functional resistance assay; single lab with multiple methods\",\n      \"pmids\": [\"42086676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PINX1 promotes ILF3 ubiquitination via the E3 ligase SPOP, leading to ILF3 degradation and suppression of the PI3K-AKT-mTOR pathway; this inhibits tumor proliferation and enhances cisplatin sensitivity in nasopharyngeal carcinoma. STAT3 suppresses PINX1 transcription (confirmed by ChIP and dual-luciferase assay).\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, chromatin immunoprecipitation, dual-luciferase assay, western blot, cell cycle and IC50 assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP, ubiquitination assay, ChIP/reporter for transcriptional regulation, functional assays; single lab\",\n      \"pmids\": [\"40667563\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MCRS2 (an isoform of MCRS1/p78) interacts with LPTS/PinX1 in vitro and in vivo, co-localizes with it in cells, and inhibits telomerase activity in vitro; long-term MCRS2 overexpression causes progressive telomere shortening.\",\n      \"method\": \"Yeast two-hybrid (initial identification), co-immunoprecipitation, co-localization microscopy, in vitro telomerase inhibition assay (TRAP), stable overexpression with telomere length monitoring\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP and co-localization plus in vitro functional assay; single lab\",\n      \"pmids\": [\"15044100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PinX1 inhibits telomerase activity in gastric cancer cells through upregulation of Mad1 and downregulation of c-Myc; PinX1 RNAi produces the opposite effect (downregulation of Mad1, upregulation of c-Myc), placing PinX1 upstream of the Mad1/c-Myc pathway in telomerase regulation.\",\n      \"method\": \"Transfection of PinX1 and PinX1-siRNA, TRAP telomerase assay, RT-PCR and western blot for Mad1/c-Myc\",\n      \"journal\": \"Journal of gastrointestinal surgery\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single set of gene expression readouts without mechanistic dissection of pathway causality\",\n      \"pmids\": [\"20544396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PinX1 interacts with RBM10 (identified by immunoprecipitation-mass spectrometry); this interaction may assist telomerase localization to telomeres and promote telomere maintenance, thereby inhibiting immunostimulatory effects of ionizing radiation.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (for interactor identification), functional radiosensitivity assays, cGAS-STING pathway western blot\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — IP-MS identification of interaction with limited mechanistic follow-up for the specific PinX1-RBM10 mechanism; single lab\",\n      \"pmids\": [\"38431575\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PinX1 is a multifunctional nuclear protein that acts as a potent endogenous telomerase inhibitor by directly binding hTERT (at its hTR-binding domain) and the assembled hTERT·hTR complex via its C-terminal TID domain (aa 290–328); it is recruited to telomeres by TRF1 and is required for both telomerase inhibition in cis and for TRF1 stability, while also facilitating telomerase recruitment/localization to telomeres during S phase via interactions with NPM and POT1 complex components; in mitosis, PinX1 relocalizes to kinetochores (Hec1/CENP-E-dependent) and chromosome periphery (Nucleolin-dependent) as a microtubule-binding protein essential for faithful chromosome segregation; its stability is regulated by Plk1-mediated mitotic phosphorylation (leading to ubiquitin-proteasomal degradation) and by TERT in the nucleolus; it also activates the RNA helicase Prp43/DHX15 via its G-patch domain to drive ribosome biogenesis; binds the ZnF3-BRCT domain of PARP1 to facilitate XRCC1 recruitment and DNA repair; interacts with POLR1G/UBTF to promote RNA Pol I preinitiation complex assembly, a function inhibited by nutrient starvation-induced acetylation at multiple lysines; functions as a transcriptional corepressor of estrogen receptor alpha and coactivator of androgen receptor; and is transcriptionally regulated by p53 (activation), NF-κB/p65 (repression), and STAT3 (repression).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PINX1 is a multifunctional nucleolar and telomeric protein that integrates telomerase regulation, chromosome segregation, and ribosome biogenesis [#0, #3, #15]. It was first defined as a Pin2/TRF1-binding protein that directly binds the telomerase catalytic subunit hTERT through its C-terminal telomerase inhibitory domain (TID, residues 290–328) and potently inhibits telomerase activity, shortening telomeres when overexpressed and elongating them when depleted [#0, #10]; binding extends to the assembled hTERT·hTR complex via the hTR-binding domain of hTERT [#2]. PINX1 is recruited to telomeres by TRF1 through a minimal sequence requiring Leu-291, an interaction needed for telomere localization and for inhibition of telomere elongation in cis [#7], and it reciprocally stabilizes TRF1 against ubiquitin-mediated degradation, with loss of PINX1 triggering telomere DNA damage responses and chromosome instability [#14]. Beyond inhibition, PINX1 has a positive role in telomerase recruitment, promoting telomerase association with the POT1 complex and with hTERT during S phase, acting in part as a linker that brings nucleophosmin (NPM) into a ternary complex with hTERT [#4, #13, #18, #22]. In mitosis, PINX1 is a microtubule-binding protein that relocalizes to the outer kinetochore (Hec1/CENP-E-dependent) and chromosome periphery (Nucleolin-dependent), where it is essential for chromosome congression and faithful segregation [#3, #5]; its mitotic stability is controlled by Plk1-mediated phosphorylation that drives proteasomal degradation [#8]. In the nucleolus, PINX1 activates the DEAH-box RNA helicase Prp43/DHX15 through its G-patch domain to stimulate ATPase activity and drive ribosomal subunit maturation [#15, #24], and it promotes RNA polymerase I preinitiation complex assembly via POLR1G/UBTF, a function shut down by nutrient-starvation-induced lysine acetylation [#29]. PINX1 also functions in DNA repair, binding the ZnF3-BRCT domain of PARP1 to facilitate XRCC1 recruitment independently of its telomerase activity [#28]. Genetic studies establish PINX1 as a haploinsufficient tumor suppressor: heterozygous mice develop telomerase-dependent chromosomal instability and spontaneous tumors, while nullizygosity is embryonic lethal [#11]. PINX1 expression is transcriptionally activated by p53 and repressed by NF-κB/p65 and STAT3 [#26, #20, #31].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established PINX1 as a direct, endogenous telomerase inhibitor, answering whether a TRF1-associated factor could regulate telomerase catalytic activity.\",\n      \"evidence\": \"Co-IP, in vitro TRAP telomerase assay, overexpression/RNAi, and xenograft assay in human cells\",\n      \"pmids\": [\"11701125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which hTERT domain is bound\", \"Did not address PINX1 functions outside telomerase\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Revealed a conserved second function in rRNA/snoRNA maturation via the G-patch domain, showing PINX1 is not solely a telomere factor.\",\n      \"evidence\": \"Yeast GNO1 deletion, complementation with human PINX1, Northern blot, G-patch mutagenesis\",\n      \"pmids\": [\"12107183\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of the G-patch domain not identified at this stage\", \"Link between nucleolar and telomeric functions unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the binding mode by which PINX1 represses telomerase, showing it engages the hTR-binding domain of hTERT and the assembled hTERT·hTR complex.\",\n      \"evidence\": \"In vitro pulldown and cellular co-IP with hTERT/hTR depletion controls\",\n      \"pmids\": [\"15381700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of complex binding not determined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified MCRS2 as an additional PINX1-associated telomerase inhibitor, expanding the inhibitory protein network.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, co-localization, in vitro TRAP, stable overexpression telomere monitoring\",\n      \"pmids\": [\"15044100\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of MCRS2 contribution to telomerase inhibition not dissected\", \"In vivo relevance unaddressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovered a mitotic role: PINX1 is a microtubule-binding protein at kinetochores and chromosome periphery essential for faithful segregation, distinct from telomerase regulation.\",\n      \"evidence\": \"Deconvolution and live imaging, biochemical microtubule binding, siRNA, deletion mapping\",\n      \"pmids\": [\"19553660\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct microtubule-binding interface not mapped at residue level\", \"Mechanistic link to its interphase telomere role unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified Nucleolin as the recruiter of PINX1 to the chromosome periphery, defining how PINX1 supports chromosome congression in mitosis.\",\n      \"evidence\": \"Reciprocal co-IP, deconvolution microscopy, Nucleolin siRNA, live mitosis imaging\",\n      \"pmids\": [\"19393617\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"How Nucleolin and kinetochore recruitment pathways coordinate not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed PINX1 has a positive role in telomerase recruitment, reconciling inhibitory and recruitment functions.\",\n      \"evidence\": \"shRNA knockdown, telomere length analysis, co-IP of telomerase with POT1 complex\",\n      \"pmids\": [\"19117989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the switch between inhibition and recruitment not defined\", \"Two methods, single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated PINX1 controls TRF1 nucleolar accumulation and telomere binding, with the C-terminus required for nucleolar localization.\",\n      \"evidence\": \"Co-localization, deletion-mutant overexpression, TRF1 telomere analysis, fibrillarin co-staining\",\n      \"pmids\": [\"19265708\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of forced TRF1 redistribution unclear\", \"Physiological versus overexpression context not separated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Mapped the functional domains: residues 290–328 constitute the TID binding hTERT, and 254–289 binds Pin2/TRF1, separating telomere targeting from telomerase inhibition.\",\n      \"evidence\": \"Domain-mapping pulldowns, in vitro TRAP with truncation mutants, telomere length analysis\",\n      \"pmids\": [\"20620128\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Structural detail of domain–partner contacts absent\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined TRF1 as the recruiter of PINX1 to telomeres, with Leu-291 essential, linking localization to inhibition of telomere elongation in cis.\",\n      \"evidence\": \"Leu-291 mutagenesis, TRF1 RNAi epistasis, telomere length and telomerase activity assays, co-IP\",\n      \"pmids\": [\"21119197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How telomere recruitment couples to catalytic inhibition mechanistically not fully resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Established Plk1 as a negative regulator of PINX1 stability through mitotic phosphorylation-driven proteasomal degradation.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, phosphosite mutagenesis, proteasome inhibitor, knockdown/overexpression\",\n      \"pmids\": [\"20573420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase mediating degradation not identified\", \"Functional consequence for segregation not directly tied to phosphosites\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided in vivo proof that PINX1 is a haploinsufficient tumor suppressor required for chromosome stability and telomerase control.\",\n      \"evidence\": \"PINX1 knockout/heterozygous mouse model, MEF telomerase assay, cytogenetics, tumor histopathology, p53 epistasis\",\n      \"pmids\": [\"21436583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific contributions not dissected\", \"Relative weight of telomere versus mitotic functions in tumorigenesis unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed endogenous PINX1 acts at telomeres primarily in mitosis, stabilizing TRF1 and promoting timely M-phase entry.\",\n      \"evidence\": \"Telomere ChIP, siRNA knockdown, cell cycle analysis\",\n      \"pmids\": [\"22331467\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Mechanism connecting TRF1 stabilization to mitotic entry not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated PINX1 directs cell-cycle-dependent trafficking of hTERT to telomeres in S phase and chromosomes in anaphase.\",\n      \"evidence\": \"Immunofluorescence co-localization, siRNA, cell-cycle synchronization\",\n      \"pmids\": [\"22749911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trafficking machinery used by PINX1 not identified\", \"Localization data without biochemical mechanism\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved the PINX1–TRF1–hTERT regulatory circuit, showing PINX1 stabilizes TRF1 and that hTERT plays dual roles in this stability pathway.\",\n      \"evidence\": \"siRNA, co-IP, ubiquitination assay, TIF assay, cytogenetics, ectopic hTERT, hTERT co-knockdown epistasis\",\n      \"pmids\": [\"24415760\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which hTERT both supports and antagonizes TRF1 stability not fully explained\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified p53 as a direct transcriptional activator of PINX1 and showed HPV16 E6 suppresses PINX1 by inhibiting p53, linking PINX1 regulation to viral oncogenesis.\",\n      \"evidence\": \"ChIP, luciferase reporter, p53 overexpression/knockdown, E6 expression, TRAP\",\n      \"pmids\": [\"24412852\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Other transcriptional inputs not assessed here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined PINX1 as a direct activator of the Prp43/DHX15 helicase through its G-patch domain, mechanistically explaining its ribosome biogenesis role.\",\n      \"evidence\": \"In vitro ATPase stimulation, co-IP (yeast and human), G-patch mutagenesis, sucrose gradient ribosome analysis\",\n      \"pmids\": [\"24823796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of G-patch–Prp43 engagement addressed only later\", \"Human cellular ribosome phenotype not fully quantified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed PINX1 represses ERα as a transcriptional corepressor, extending its role to nuclear receptor signaling.\",\n      \"evidence\": \"Co-IP, ChIP on E2-regulated promoters, AF-1/AF-2 reporter assays, ERα domain mapping\",\n      \"pmids\": [\"26187699\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Corepressor mechanism (recruited complexes) not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified PINX1 suppression of MMP-9 via NF-κB as a basis for inhibiting breast cancer migration and invasion.\",\n      \"evidence\": \"siRNA/overexpression, zymography, NF-κB reporter, tail-vein metastasis model\",\n      \"pmids\": [\"25888829\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target in the NF-κB axis not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established TERT as a stabilizer of nucleolar PINX1, defining a reciprocal protein-stability relationship specific to the C-terminal fragment.\",\n      \"evidence\": \"TERT siRNA/overexpression, cycloheximide chase with truncation mutants\",\n      \"pmids\": [\"26194824\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of TERT-mediated stabilization unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed PINX1 links NPM to hTERT, with NPM recruitment partially attenuating PINX1's telomerase inhibition.\",\n      \"evidence\": \"Co-IP, direct binding assay, TRAP, domain mapping\",\n      \"pmids\": [\"28255170\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Quantitative balance of inhibition versus attenuation not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined NF-κB p65 as a direct transcriptional repressor binding two promoter response elements of PINX1.\",\n      \"evidence\": \"EMSA, ChIP, promoter-reporter with site-directed mutagenesis\",\n      \"pmids\": [\"29017500\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Upstream signals controlling p65 occupancy not addressed here\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed PINX1 as an EV71 3C protease substrate, cleaved at Q50–G51 to promote apoptosis and viral release, identifying a host-pathogen vulnerability.\",\n      \"evidence\": \"Co-IP, in vitro cleavage assay, overexpression/siRNA, apoptosis and viral release assays\",\n      \"pmids\": [\"27847364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Consequences of cleavage for PINX1's other functions not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed PINX1 represses tumor angiogenesis by transcriptionally activating miR-125a-3p to suppress VEGF.\",\n      \"evidence\": \"miRNA microarray, ChIP, luciferase reporter, siRNA, angiogenesis assay, xenograft\",\n      \"pmids\": [\"31254127\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a telomerase regulator acts as a direct transcriptional activator mechanistically unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Refined the cell-cycle timing of the NPM/PINX1/hTERT ternary complex to early S phase, tying it to telomere extension.\",\n      \"evidence\": \"Immunofluorescence, synchronization, co-IP, TRF telomere assay\",\n      \"pmids\": [\"31210926\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Causal contribution of complex timing to net telomerase output not isolated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed EBV LMP1 represses PINX1 by enhancing NF-κB p65 promoter binding, increasing telomerase activity, connecting viral oncogenesis to PINX1 control.\",\n      \"evidence\": \"ChIP, dual-luciferase reporter, LMP1 overexpression, TRAP, Southern blot\",\n      \"pmids\": [\"31027734\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct versus indirect effect of LMP1 on p65 not fully separated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined distinct structural binding modes of PINX1 versus Pfa1 G-patches to Prp43 while showing both require the OB-fold β4–β5 loop for ATPase/helicase stimulation.\",\n      \"evidence\": \"In vitro ATPase and helicase assays, Prp43 loop mutants in yeast, co-IP, ribosome biogenesis analysis\",\n      \"pmids\": [\"32882145\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full structural model of human PINX1–DHX15 complex not solved\", \"Functional impact in human cells not directly tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a telomerase-independent DNA repair function: PINX1 binds the PARP1 ZnF3-BRCT domain to promote PARP1-chromatin loading and XRCC1 recruitment.\",\n      \"evidence\": \"IP-MS, co-IP with domain specificity, chromatin fractionation, γH2AX assays, rescue with telomerase-inhibitory mutant\",\n      \"pmids\": [\"39174499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which DNA repair pathways depend on PINX1 not fully mapped\", \"Structural detail of PARP1 interaction absent\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Reported PINX1 interaction with RBM10 as a possible contributor to telomere maintenance modulating radiation immunostimulation.\",\n      \"evidence\": \"IP-MS interactor identification, radiosensitivity assays, cGAS-STING western blot\",\n      \"pmids\": [\"38431575\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"IP-MS identification with limited mechanistic follow-up for the specific PINX1-RBM10 mechanism\", \"Causality of telomere effect not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined PINX1's role in RNA Pol I preinitiation complex assembly via POLR1G/UBTF and showed nutrient-starvation acetylation disrupts this to shut down rDNA transcription.\",\n      \"evidence\": \"Co-IP (PINX1-POLR1G-UBTF), MS acetylation site mapping, acetyl-site mutagenesis, rDNA transcription and ribosome biogenesis assays\",\n      \"pmids\": [\"40639785\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase/deacetylase enzymes not identified\", \"Integration with the DHX15 ribosome function not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed PINX1 promotes SPOP-mediated ILF3 ubiquitination to suppress PI3K-AKT-mTOR signaling and enhance cisplatin sensitivity, with STAT3 repressing PINX1 transcription.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, ChIP, dual-luciferase, cell cycle and IC50 assays\",\n      \"pmids\": [\"40667563\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PINX1 acts directly in the ubiquitination complex unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Reported a TID-dependent PINX1–Rab11a–RanBP2 axis driving Rab11a SUMOylation and degradation to impair migrasome formation and reduce cisplatin resistance.\",\n      \"evidence\": \"Co-IP, immunofluorescence, ChIP (TP53 on promoter), Rab11a SUMOylation assay, domain mapping, migrasome and resistance assays\",\n      \"pmids\": [\"42086676\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PINX1 directly catalyzes or scaffolds SUMOylation unclear\", \"Single lab\", \"Generalizability beyond nasopharyngeal carcinoma untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PINX1's many functions—telomerase regulation, kinetochore/microtubule binding, RNA Pol I and DHX15-driven ribosome biogenesis, DNA repair, and nuclear receptor coregulation—are coordinated within one protein and partitioned across cell-cycle phases and subcellular compartments remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying structural model integrating the TID, G-patch, and TRF1-binding domains\", \"No comprehensive map of which functions dominate in physiological versus disease contexts\", \"Regulatory hierarchy among p53, NF-κB, and STAT3 transcriptional inputs not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 10, 15, 24]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [17, 21, 29]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [18, 28, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [1, 3, 6, 27]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 27]},\n      {\"term_id\": \"GO:0005694\", \"supporting_discovery_ids\": [3, 5, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 15, 24, 29]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [3, 5, 11]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [28]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [17, 29]}\n    ],\n    \"complexes\": [\n      \"telomerase (hTERT·hTR) complex\",\n      \"RNA polymerase I preinitiation complex\",\n      \"kinetochore\"\n    ],\n    \"partners\": [\n      \"TERT\",\n      \"TRF1\",\n      \"NPM\",\n      \"DHX15\",\n      \"PARP1\",\n      \"POLR1G\",\n      \"UBTF\",\n      \"POT1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}