{"gene":"PTPRD","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2009,"finding":"PTPRD dephosphorylates the oncoprotein STAT3; wild-type PTPRD inhibits growth of GBM cells, whereas cancer-specific mutant alleles lose this function, establishing PTPRD as a tumor suppressor phosphatase that directly targets STAT3.","method":"Cell growth assays with WT vs. mutant PTPRD reconstitution; STAT3 dephosphorylation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — direct substrate identification with functional reconstitution and mutant loss-of-function, replicated across multiple cancer cell lines in same study, independently supported by subsequent papers","pmids":["19478061"],"is_preprint":false},{"year":2014,"finding":"Loss of Ptprd in mice results in phospho-STAT3 accumulation and constitutive activation of STAT3-driven gene programs; heterozygous Ptprd loss cooperates with p16/CDKN2A deletion to drive gliomagenesis, demonstrating haploinsufficiency and dosage dependence.","method":"Mouse glioma model (RCAS/tv-a system), immunoblot for pSTAT3, genetic epistasis with CDKN2A deletion","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic epistasis plus biochemical pSTAT3 readout, orthogonal to in vitro data","pmids":["24843164"],"is_preprint":false},{"year":2014,"finding":"Using a substrate-trap form of PTPRD combined with mass spectrometry and co-immunoprecipitation, desmoplakin was identified as a novel PTPRD substrate; cancer-associated mutant PTPRD showed reduced phosphatase activity toward desmoplakin and conferred enhanced cell migration.","method":"Substrate-trap mutagenesis, mass spectrometry, co-immunoprecipitation, migration assays","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 1/2 — substrate-trap approach with MS identification, validated by Co-IP and functional assays in same study","pmids":["25113440"],"is_preprint":false},{"year":2014,"finding":"Heterozygous and homozygous deletion of Ptprd in mice cooperates with Cdkn2a loss to accelerate tumorigenesis and alter tumor spectrum, increasing lymphoma frequency; heterozygous loss alone was sufficient, indicating haploinsufficient tumor suppressor activity.","method":"Mouse genetic model — co-deletion of Ptprd and Cdkn2a, tumor spectrum analysis","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 — clean genetic epistasis in vivo with specific tumor phenotype","pmids":["25138050"],"is_preprint":false},{"year":1994,"finding":"The intracellular catalytic domain of HPTP-beta (PTPRB; note: the paper describes HPTPβ, a distinct PTP, but PMID 8135747 concerns HPTPβ not PTPRD — excluding this entry as it is a different gene).","method":"N/A","journal":"N/A","confidence":"Low","confidence_rationale":"Symbol collision — HPTPβ is PTPRB, not PTPRD","pmids":[],"is_preprint":false},{"year":1993,"finding":"The murine ortholog MPTP-delta (PTPRD) is expressed in hippocampus, thalamic reticular nucleus, and piriform cortex in brain, and in pre-B cell lines; the cytoplasmic region contains two tandem PTP domains with intrinsic phosphatase activity; at least three mRNA isoforms differing in extracellular domain composition (Ig-like and FN-III domains) were identified.","method":"cDNA library screening, Northern blot, in situ hybridization, antibody detection of ~210 kDa protein in brain/kidney lysates","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (cloning, expression, in situ hybridization, antibody) defining isoforms and tissue distribution with biochemical validation","pmids":["8355697"],"is_preprint":false},{"year":2011,"finding":"PTPRD suppresses colon cancer cell migration and is required for appropriate cell-cell adhesion; PTPRD regulates cell migration in cooperation with β-catenin/TCF signaling and its target CD44.","method":"Overexpression/knockdown in colon cancer lines, migration assays, cell-cell adhesion assays, signaling pathway analysis","journal":"Experimental and therapeutic medicine","confidence":"Medium","confidence_rationale":"Tier 2/3 — functional assays with pathway placement but single lab, limited mechanistic depth","pmids":["22977525"],"is_preprint":false},{"year":2015,"finding":"Loss-of-function PTPRD mutations (but not methylation or copy number loss) lead to increased STAT3 activation in head and neck cancer; overexpression of wild-type PTPRD inhibits STAT3 phosphorylation and cell growth, whereas PTPRD mutants do not.","method":"Transfection of WT vs. mutant PTPRD, immunoblot for pSTAT3, MTT growth assay, methylation-specific PCR","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic link between mutation type and STAT3 substrate activity confirmed in HNSCC cells","pmids":["26267899"],"is_preprint":false},{"year":2019,"finding":"PTPRD-loss increases CXCL8 expression via ERK and STAT3 signaling pathways, promoting angiogenesis and metastasis in gastric cancer; inhibitors of ERK or STAT3 abrogate PTPRD-loss-induced angiogenesis.","method":"Microarray, stable/transient PTPRD knockdown, ELISA, in vitro tube formation, specific kinase inhibitors","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2/3 — mechanistic pathway (PTPRD→STAT3/ERK→CXCL8→angiogenesis) established with multiple assays in single lab","pmids":["31805999"],"is_preprint":false},{"year":2018,"finding":"Heterozygous PTPRD knockout reduces cocaine self-administration in mice; 7-butoxy illudalic acid analog (7-BIA) identified as a small molecule that targets PTPRD and inhibits its phosphatase activity with some selectivity, reducing cocaine-conditioned place preference in a PTPRD-dependent manner.","method":"Heterozygous KO mouse cocaine self-administration, phosphatase inhibition assay with 7-BIA, conditioned place preference with rescue by KO","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1/2 — in vitro phosphatase inhibition assay plus in vivo genetic rescue (KO specificity), multiple behavioral paradigms","pmids":["30348770"],"is_preprint":false},{"year":2022,"finding":"PTPRD phosphatase activity dephosphorylates several brain phosphotyrosine phosphoproteins (identified as candidate substrates by increased phosphorylation in KO vs. WT mice and brisk dephosphorylation by recombinant PTPRD); flavonols (quercetin and other flavonols) positively allosterically modulate PTPRD's dephosphorylation of a substrate-selective subset including GSK3β and GSK3α but not others.","method":"KO vs. WT phosphoproteomics, recombinant PTPRD in vitro phosphatase assay, substrate-selective positive allosteric modulation by flavonols","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 1/2 — in vitro reconstitution with recombinant enzyme and multiple substrates, substrate selectivity confirmed; single lab","pmids":["35636503"],"is_preprint":false},{"year":2023,"finding":"Antibody RD-43 targeting the PTPRD ectodomain triggers PTPRD dimerization, which impairs phosphatase activity; the mAb-PTPRD dimer complex is then degraded via lysosomal and proteasomal pathways independently of secretase cleavage; RD-43 treatment inhibits SRC signaling downstream of PTPRD and suppresses PTPRD-dependent cell invasion in metastatic breast cancer cells.","method":"Monoclonal antibody binding to endogenous PTPRD (Co-IP/western), dimerization assay, chemically induced dimerization, phosphatase activity assay, lysosomal/proteasomal inhibitor treatments, SRC signaling immunoblot, invasion assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal methods establishing dimerization-mediated inhibition mechanism, degradation pathway, and downstream SRC signaling consequence in single rigorous study","pmids":["37669874"],"is_preprint":false},{"year":2015,"finding":"PTPRD is downregulated in type 2 diabetes by DNMT1-mediated promoter DNA hypermethylation; PTPRD knockdown reduces insulin receptor expression, and overexpression of human insulin receptor PPARγ2 in HepG2 cells induces PTPRD overexpression, indicating PTPRD participates in insulin signaling upstream of the insulin receptor.","method":"shRNA knockdown, overexpression in HepG2, bisulfite analysis, DNMT1 inhibitor experiments, T2D mouse model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2/3 — mechanistic link to insulin signaling established by knockdown/overexpression and epigenetic analysis, single lab","pmids":["26079428"],"is_preprint":false},{"year":2015,"finding":"In mouse PTPRD knockout models, reduced PTPRD expression leads to decreased sleep at the end of active periods, increased locomotion in heterozygotes, and shifted dose-response relationships for cocaine reward, establishing behavioral roles for PTPRD in sleep, locomotion, and drug reward circuits.","method":"Heterozygous and homozygous PTPRD knockout mice, behavioral assays (locomotion, cocaine conditioned place preference, sleep assessment)","journal":"Molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — genetic loss-of-function with defined behavioral phenotypes, but mechanistic pathway not fully resolved","pmids":["26181631"],"is_preprint":false},{"year":2022,"finding":"PTPRD suppresses PD-L1 expression in hepatocellular carcinoma cells (HepG2) by downregulating STAT3 and pSTAT3; PTPRD overexpression reduces pSTAT3 and PD-L1, while PTPRD depletion increases them.","method":"Overexpression and knockdown in HepG2, western blot for STAT3/pSTAT3/PD-L1","journal":"Translational cancer research","confidence":"Medium","confidence_rationale":"Tier 3 — mechanistic pathway placement (PTPRD→STAT3→PD-L1) by gain/loss of function, single lab","pmids":["35117921"],"is_preprint":false},{"year":2022,"finding":"PTPRD methylation-mediated silencing (via DNMT1) promotes pulmonary arterial smooth muscle cell migration through the PDGFRB/PLCγ1 axis; PTPRD knockdown rats under hypoxia develop exacerbated pulmonary hypertension with elevated PLCγ1 activity.","method":"Stable PTPRD knockdown in PASMCs, DNMT1 inhibition/promoter methylation analysis, PDGFRB/PLCγ1 inhibitor studies, heterozygous PTPRD KO rats with hypoxia-induced PH model","journal":"Journal of hypertension","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro and in vivo mechanistic pathway (PTPRD→PDGFRB/PLCγ1→migration) established with KO animal model and specific pathway inhibitors","pmids":["35848503"],"is_preprint":false},{"year":2024,"finding":"Loss of PTPRD in mice (Ptprd+/- or Ptprd-/-) increases excitatory and inhibitory cortical neuron numbers persisting into adulthood, impairs both excitatory and inhibitory synaptic function in medial prefrontal cortex, and induces autistic-like behaviors without learning/memory or anxiety deficits.","method":"Constitutive heterozygous and homozygous Ptprd KO mice, neuronal counting, electrophysiology, behavioral assays","journal":"Biological research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic loss-of-function with defined synaptic and behavioral phenotypes and neuronal quantification","pmids":["38890753"],"is_preprint":false},{"year":2024,"finding":"Neural conditional knockout of PTPRD in the telencephalon reduces glial precursors, astrocytes, and oligodendrocytes; this gliogenic defect results from fewer radial glia at gliogenesis onset and reduced activation of the JAK/STAT pathway and gliogenic gene expression.","method":"Conditional KO mouse (telencephalon-specific), cell counting, JAK/STAT pathway immunoblot/immunofluorescence, gliogenic gene expression","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — tissue-specific KO with defined cellular phenotype and pathway identification (JAK/STAT), single lab","pmids":["38487272"],"is_preprint":false},{"year":2020,"finding":"PTPRD hypomethylation in pre-adipocytes of first-degree relatives of T2D subjects leads to PTPRD upregulation; overexpression of Ptprd in 3T3-L1 pre-adipocytes inhibits adipogenesis, establishing a functional role for PTPRD in restraining adipogenesis.","method":"MeDIP-Seq/RNA-Seq, bisulfite sequencing, Ptprd overexpression in 3T3-L1 cells with adipogenesis readout","journal":"Epigenomics","confidence":"Medium","confidence_rationale":"Tier 2/3 — functional overexpression experiment with cellular differentiation phenotype correlated with epigenetic mechanism","pmids":["32483983"],"is_preprint":false},{"year":2022,"finding":"PTPRD was identified as a substrate of BACE1 in Alzheimer's disease brain, with reduced PTPRD protein levels confirmed by Western blotting in AD samples.","method":"Bioinformatics analysis of BACE1 substrate proteomics dataset; Western blot validation in AD brain tissue","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 — computational prediction with single Western blot validation, no direct enzymatic cleavage assay","pmids":["35562959"],"is_preprint":false},{"year":2025,"finding":"NSUN2-mediated m5C methylation of PTPRD mRNA enhances its stability in astrocytes following traumatic brain injury; elevated PTPRD promotes A1 astrocyte activation and neuroinflammation, and NSUN2 knockdown attenuates TBI-induced damage by reducing PTPRD levels.","method":"RNA immunoprecipitation (m5C-RIP), RNA stability assays, NSUN2 KD and PTPRD OE mouse models, flow cytometry for astrocyte phenotypes, TUNEL","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2 — RNA methylation writer (NSUN2) identified with RIP validation and in vivo rescue experiment","pmids":["40544933"],"is_preprint":false},{"year":1993,"finding":"The human PTPRD gene (HPTP delta) was chromosomally assigned to 9p24 by fluorescence in situ hybridization using human-mouse hybrid cell lines.","method":"FISH, somatic cell hybrid panel","journal":"Japanese journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — direct cytogenetic localization by FISH","pmids":["8294211"],"is_preprint":false}],"current_model":"PTPRD is a receptor-type protein tyrosine phosphatase that directly dephosphorylates STAT3 (and other substrates including desmoplakin and GSK3β/α) to suppress oncogenic signaling; its ectodomain mediates homotypic dimerization that inhibits phosphatase activity and can be exploited by antibodies to trigger proteasomal/lysosomal degradation; loss of PTPRD stabilizes pSTAT3, activates downstream ERK/CXCL8 and PD-L1 axes, and cooperates with CDKN2A deletion to drive gliomagenesis, while in neurons PTPRD regulates cortical neurogenesis, gliogenesis, and synaptic specification via JAK/STAT pathway modulation, and its mRNA stability is post-transcriptionally regulated by NSUN2-mediated m5C methylation."},"narrative":{"teleology":[{"year":1993,"claim":"The foundational question of PTPRD's identity, genomic location, and expression pattern was resolved: the gene maps to 9p24, encodes a ~210 kDa transmembrane phosphatase with tandem PTP catalytic domains, is expressed in specific brain regions, and generates at least three ectodomain isoforms.","evidence":"cDNA cloning, Northern blot, in situ hybridization, and antibody detection of murine PTPRD; FISH mapping of human PTPRD","pmids":["8355697","8294211"],"confidence":"High","gaps":["No substrates identified at this stage","Functional role of the extracellular Ig/FNIII domain isoforms undefined","No loss-of-function data"]},{"year":2009,"claim":"The key mechanistic question of what PTPRD dephosphorylates was answered: STAT3 was identified as a direct substrate, and cancer-associated PTPRD mutations were shown to abrogate phosphatase activity toward STAT3, establishing PTPRD as a tumor suppressor phosphatase.","evidence":"Reconstitution of WT versus mutant PTPRD in GBM cells with STAT3 dephosphorylation and growth inhibition assays","pmids":["19478061"],"confidence":"High","gaps":["In vivo validation of STAT3 regulation by PTPRD not yet established","Full substrate repertoire unknown","Mechanism of PTPRD inactivation in cancer beyond point mutations unclear"]},{"year":2014,"claim":"Three independent studies expanded the functional picture: in vivo genetic models proved that heterozygous Ptprd loss is sufficient to elevate pSTAT3 and cooperate with CDKN2A deletion to drive gliomas and lymphomas, while substrate-trap proteomics identified desmoplakin as an additional substrate linking PTPRD to cell migration and adhesion.","evidence":"RCAS/tv-a glioma mouse models with Ptprd/Cdkn2a co-deletion; Ptprd/Cdkn2a double-KO tumor spectrum analysis; substrate-trap mutagenesis with mass spectrometry in cancer cell lines","pmids":["24843164","25138050","25113440"],"confidence":"High","gaps":["Structural basis for substrate selectivity unknown","Whether desmoplakin dephosphorylation is physiologically relevant in vivo not tested","Mechanism of haploinsufficiency versus dominant-negative effects not resolved"]},{"year":2015,"claim":"PTPRD's STAT3-targeting role was extended to head and neck cancer, and behavioral genetics revealed that Ptprd dosage modulates sleep, locomotion, and cocaine reward in mice, establishing neurological functions beyond development.","evidence":"WT/mutant PTPRD transfection with pSTAT3 immunoblot in HNSCC cells; heterozygous/homozygous KO mouse behavioral assays","pmids":["26267899","26181631"],"confidence":"Medium","gaps":["Neural substrates mediating behavioral phenotypes not identified","Whether STAT3 mediates PTPRD's behavioral effects unclear","PTPRD's role in specific neural circuits not mapped"]},{"year":2018,"claim":"Pharmacological targeting of PTPRD became feasible: 7-BIA was identified as a small-molecule phosphatase inhibitor with in vivo efficacy in reducing cocaine conditioned place preference in a PTPRD-dependent manner.","evidence":"In vitro phosphatase inhibition assay; PTPRD heterozygous KO rescue of behavioral effect of 7-BIA","pmids":["30348770"],"confidence":"High","gaps":["7-BIA selectivity across the PTP family not fully profiled","Neural circuit mechanism of PTPRD in reward not established","Therapeutic window and off-target effects undefined"]},{"year":2019,"claim":"Downstream consequences of PTPRD loss were elaborated: PTPRD deficiency activates ERK and STAT3 to upregulate CXCL8, promoting angiogenesis and metastasis in gastric cancer.","evidence":"Microarray, PTPRD knockdown, ELISA for CXCL8, tube formation assay, ERK/STAT3 inhibitor rescue","pmids":["31805999"],"confidence":"Medium","gaps":["Whether PTPRD directly dephosphorylates ERK or acts indirectly not resolved","In vivo validation of angiogenesis pathway limited"]},{"year":2022,"claim":"The substrate repertoire and signaling consequences of PTPRD were broadened: GSK3β/α were identified as brain substrates with substrate-selective allosteric modulation by flavonols; PTPRD was shown to suppress PD-L1 via STAT3; and PTPRD loss was linked to PDGFRB/PLCγ1-driven smooth muscle cell migration and pulmonary hypertension.","evidence":"KO versus WT phosphoproteomics with recombinant PTPRD in vitro assay; PTPRD overexpression/knockdown in HepG2 for PD-L1; PTPRD KO rats under hypoxia with PDGFRB/PLCγ1 inhibitor studies","pmids":["35636503","35117921","35848503"],"confidence":"Medium","gaps":["Structural basis for substrate-selective allosteric modulation by flavonols unknown","Whether PTPRD directly dephosphorylates PDGFRB not demonstrated","PD-L1 regulation not tested in vivo or in immune-competent models"]},{"year":2023,"claim":"The regulatory mechanism of PTPRD's ectodomain was elucidated: antibody-induced homotypic dimerization inhibits phosphatase activity and targets the receptor for lysosomal/proteasomal degradation, suppressing SRC signaling and invasion in breast cancer.","evidence":"Monoclonal antibody RD-43 binding, dimerization assay, chemically induced dimerization, phosphatase activity measurement, degradation pathway dissection with inhibitors, SRC immunoblot, invasion assay","pmids":["37669874"],"confidence":"High","gaps":["Whether dimerization-mediated inhibition occurs physiologically via endogenous ligands unknown","Crystal structure of dimerized PTPRD ectodomain not available","In vivo therapeutic efficacy of RD-43 not demonstrated"]},{"year":2024,"claim":"PTPRD's roles in cortical development were mechanistically defined: loss increases both excitatory and inhibitory neuron numbers and impairs synaptic function causing autistic-like behaviors, while neural-specific deletion reduces gliogenesis by lowering JAK/STAT pathway activation in radial glia.","evidence":"Constitutive and conditional PTPRD KO mice with neuronal counting, electrophysiology, behavioral assays, and JAK/STAT immunoblot/immunofluorescence","pmids":["38890753","38487272"],"confidence":"Medium","gaps":["Specific PTPRD substrates mediating cortical neurogenesis versus gliogenesis decisions unidentified","Relationship between synaptic dysfunction and behavioral phenotype at circuit level not resolved","Whether JAK/STAT regulation by PTPRD in glia involves direct JAK dephosphorylation unknown"]},{"year":2025,"claim":"Post-transcriptional regulation of PTPRD was uncovered: NSUN2-mediated m5C methylation stabilizes PTPRD mRNA in astrocytes after traumatic brain injury, promoting A1 astrocyte activation and neuroinflammation.","evidence":"m5C-RIP, RNA stability assays, NSUN2 knockdown and PTPRD overexpression mouse models, astrocyte phenotyping by flow cytometry","pmids":["40544933"],"confidence":"Medium","gaps":["Specific m5C sites on PTPRD mRNA and their individual contributions not mapped","Whether NSUN2-PTPRD axis operates in other neuroinflammatory contexts untested","Reader protein interpreting m5C on PTPRD mRNA not identified"]},{"year":null,"claim":"Key unresolved questions include: the full physiological substrate repertoire of PTPRD in neurons versus non-neuronal tissues; the structural basis of substrate selectivity and allosteric regulation; whether endogenous trans-ligands trigger dimerization-mediated inhibition in vivo; and the precise mechanism by which PTPRD loss leads to both increased neurogenesis and impaired gliogenesis.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of full-length PTPRD or substrate-bound catalytic domain","Endogenous extracellular ligands that regulate dimerization not identified","Relationship between STAT3 dephosphorylation and SRC regulation not integrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,2,9,10,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,7,14]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5,11]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,7,8,14,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,3,7,8]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[16,17]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[9,13,16]}],"complexes":[],"partners":["STAT3","DSP","GSK3B","GSK3A","SRC","NSUN2"],"other_free_text":[]},"mechanistic_narrative":"PTPRD is a receptor-type protein tyrosine phosphatase that functions as a haploinsufficient tumor suppressor and a regulator of neuronal development by directly dephosphorylating substrates including STAT3, desmoplakin, and GSK3β/α [PMID:19478061, PMID:25113440, PMID:35636503]. Loss of PTPRD stabilizes phospho-STAT3, activating downstream oncogenic programs including ERK/CXCL8-driven angiogenesis and PD-L1 upregulation, and cooperates with CDKN2A deletion to drive gliomagenesis and lymphomagenesis in vivo [PMID:24843164, PMID:25138050, PMID:31805999, PMID:35117921]. The PTPRD ectodomain mediates homotypic dimerization that inhibits phosphatase activity, a mechanism exploited by antibodies to trigger proteasomal/lysosomal degradation and suppress SRC-dependent invasion in breast cancer [PMID:37669874]. In the nervous system, PTPRD regulates cortical neurogenesis, gliogenesis via JAK/STAT pathway modulation, and excitatory/inhibitory synaptic function, with its loss producing autistic-like behaviors in mice, and its mRNA stability is post-transcriptionally controlled by NSUN2-mediated m5C methylation [PMID:38890753, PMID:38487272, PMID:40544933]."},"prefetch_data":{"uniprot":{"accession":"P23468","full_name":"Receptor-type tyrosine-protein phosphatase delta","aliases":[],"length_aa":1912,"mass_kda":214.8,"function":"Can bidirectionally induce pre- and post-synaptic differentiation of neurons by mediating interaction with IL1RAP and IL1RAPL1 trans-synaptically. Involved in pre-synaptic differentiation through interaction with SLITRK2","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/P23468/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PTPRD","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PTPRD","total_profiled":1310},"omim":[{"mim_id":"611054","title":"PTPRF-INTERACTING PROTEIN ALPHA-1; PPFIA1","url":"https://www.omim.org/entry/611054"},{"mim_id":"610438","title":"RESTLESS LEGS SYNDROME, SUSCEPTIBILITY TO, 3; RLS3","url":"https://www.omim.org/entry/610438"},{"mim_id":"609679","title":"SLIT- AND NTRK-LIKE FAMILY, MEMBER 3; SLITRK3","url":"https://www.omim.org/entry/609679"},{"mim_id":"605263","title":"SHC TRANSFORMING PROTEIN 3; SHC3","url":"https://www.omim.org/entry/605263"},{"mim_id":"601598","title":"PROTEIN-TYROSINE PHOSPHATASE, RECEPTOR-TYPE, DELTA; PTPRD","url":"https://www.omim.org/entry/601598"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":39.1},{"tissue":"parathyroid gland","ntpm":17.4}],"url":"https://www.proteinatlas.org/search/PTPRD"},"hgnc":{"alias_symbol":["PTPD","HPTP"],"prev_symbol":[]},"alphafold":{"accession":"P23468","domains":[{"cath_id":"2.60.40.10","chopping":"23-122","consensus_level":"medium","plddt":88.5783,"start":23,"end":122},{"cath_id":"2.60.40.10","chopping":"130-230","consensus_level":"medium","plddt":83.0329,"start":130,"end":230},{"cath_id":"2.60.40.10","chopping":"235-320","consensus_level":"medium","plddt":84.209,"start":235,"end":320},{"cath_id":"2.60.40.10","chopping":"331-412","consensus_level":"medium","plddt":87.8139,"start":331,"end":412},{"cath_id":"2.60.40.10","chopping":"426-604","consensus_level":"medium","plddt":86.2732,"start":426,"end":604},{"cath_id":"2.60.40.10","chopping":"615-706","consensus_level":"high","plddt":88.9761,"start":615,"end":706},{"cath_id":"2.60.40.10","chopping":"720-777_785-820","consensus_level":"high","plddt":80.1001,"start":720,"end":820},{"cath_id":"2.60.40.10","chopping":"830-908","consensus_level":"high","plddt":81.1271,"start":830,"end":908},{"cath_id":"2.60.40.10","chopping":"927-1013","consensus_level":"medium","plddt":82.854,"start":927,"end":1013},{"cath_id":"2.60.40.10","chopping":"1024-1104","consensus_level":"high","plddt":76.0014,"start":1024,"end":1104},{"cath_id":"3.90.190.10","chopping":"1319-1618","consensus_level":"high","plddt":89.8578,"start":1319,"end":1618},{"cath_id":"3.90.190.10","chopping":"1658-1864","consensus_level":"high","plddt":93.0541,"start":1658,"end":1864}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P23468","model_url":"https://alphafold.ebi.ac.uk/files/AF-P23468-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P23468-F1-predicted_aligned_error_v6.png","plddt_mean":82.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PTPRD","jax_strain_url":"https://www.jax.org/strain/search?query=PTPRD"},"sequence":{"accession":"P23468","fasta_url":"https://rest.uniprot.org/uniprotkb/P23468.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P23468/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P23468"}},"corpus_meta":[{"pmid":"19478061","id":"PMC_19478061","title":"The tyrosine phosphatase PTPRD is a tumor suppressor that is frequently inactivated and mutated in glioblastoma and other human cancers.","date":"2009","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/19478061","citation_count":235,"is_preprint":false},{"pmid":"18660810","id":"PMC_18660810","title":"PTPRD (protein tyrosine phosphatase receptor type delta) is associated with restless legs syndrome.","date":"2008","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18660810","citation_count":194,"is_preprint":false},{"pmid":"8135747","id":"PMC_8135747","title":"Characterization and kinetic analysis of the intracellular domain of human protein tyrosine phosphatase beta (HPTP beta) using synthetic phosphopeptides.","date":"1994","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/8135747","citation_count":192,"is_preprint":false},{"pmid":"1915292","id":"PMC_1915292","title":"The 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health","url":"https://pubmed.ncbi.nlm.nih.gov/34299935","citation_count":5,"is_preprint":false},{"pmid":"10395944","id":"PMC_10395944","title":"Transcriptional regulation of a receptor protein tyrosine phosphatase gene hPTP-J by PKC-mediated signaling pathways in Jurkat and Molt-4 T lymphoma cells.","date":"1999","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/10395944","citation_count":5,"is_preprint":false},{"pmid":"27649283","id":"PMC_27649283","title":"Catalytic Intervention of MoO3 toward Ethanol Oxidation on PtPd Nanoparticles Decorated MoO3-Polypyrrole Composite Support.","date":"2016","source":"ACS applied materials & interfaces","url":"https://pubmed.ncbi.nlm.nih.gov/27649283","citation_count":5,"is_preprint":false},{"pmid":"34863978","id":"PMC_34863978","title":"Structure-activity studies of PTPRD phosphatase inhibitors identify a 7-cyclopentymethoxy illudalic acid analog candidate for development.","date":"2021","source":"Biochemical 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An [123I]iodobenzamide (IBZM) SPECT study.","date":"1996","source":"Brain research. Molecular brain research","url":"https://pubmed.ncbi.nlm.nih.gov/9037540","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49261,"output_tokens":4997,"usd":0.111369},"stage2":{"model":"claude-opus-4-6","input_tokens":8593,"output_tokens":3127,"usd":0.18171},"total_usd":0.293079,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"PTPRD dephosphorylates the oncoprotein STAT3; wild-type PTPRD inhibits growth of GBM cells, whereas cancer-specific mutant alleles lose this function, establishing PTPRD as a tumor suppressor phosphatase that directly targets STAT3.\",\n      \"method\": \"Cell growth assays with WT vs. mutant PTPRD reconstitution; STAT3 dephosphorylation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct substrate identification with functional reconstitution and mutant loss-of-function, replicated across multiple cancer cell lines in same study, independently supported by subsequent papers\",\n      \"pmids\": [\"19478061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss of Ptprd in mice results in phospho-STAT3 accumulation and constitutive activation of STAT3-driven gene programs; heterozygous Ptprd loss cooperates with p16/CDKN2A deletion to drive gliomagenesis, demonstrating haploinsufficiency and dosage dependence.\",\n      \"method\": \"Mouse glioma model (RCAS/tv-a system), immunoblot for pSTAT3, genetic epistasis with CDKN2A deletion\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic epistasis plus biochemical pSTAT3 readout, orthogonal to in vitro data\",\n      \"pmids\": [\"24843164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Using a substrate-trap form of PTPRD combined with mass spectrometry and co-immunoprecipitation, desmoplakin was identified as a novel PTPRD substrate; cancer-associated mutant PTPRD showed reduced phosphatase activity toward desmoplakin and conferred enhanced cell migration.\",\n      \"method\": \"Substrate-trap mutagenesis, mass spectrometry, co-immunoprecipitation, migration assays\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — substrate-trap approach with MS identification, validated by Co-IP and functional assays in same study\",\n      \"pmids\": [\"25113440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Heterozygous and homozygous deletion of Ptprd in mice cooperates with Cdkn2a loss to accelerate tumorigenesis and alter tumor spectrum, increasing lymphoma frequency; heterozygous loss alone was sufficient, indicating haploinsufficient tumor suppressor activity.\",\n      \"method\": \"Mouse genetic model — co-deletion of Ptprd and Cdkn2a, tumor spectrum analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic epistasis in vivo with specific tumor phenotype\",\n      \"pmids\": [\"25138050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The intracellular catalytic domain of HPTP-beta (PTPRB; note: the paper describes HPTPβ, a distinct PTP, but PMID 8135747 concerns HPTPβ not PTPRD — excluding this entry as it is a different gene).\",\n      \"method\": \"N/A\",\n      \"journal\": \"N/A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Symbol collision — HPTPβ is PTPRB, not PTPRD\",\n      \"pmids\": [],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The murine ortholog MPTP-delta (PTPRD) is expressed in hippocampus, thalamic reticular nucleus, and piriform cortex in brain, and in pre-B cell lines; the cytoplasmic region contains two tandem PTP domains with intrinsic phosphatase activity; at least three mRNA isoforms differing in extracellular domain composition (Ig-like and FN-III domains) were identified.\",\n      \"method\": \"cDNA library screening, Northern blot, in situ hybridization, antibody detection of ~210 kDa protein in brain/kidney lysates\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (cloning, expression, in situ hybridization, antibody) defining isoforms and tissue distribution with biochemical validation\",\n      \"pmids\": [\"8355697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PTPRD suppresses colon cancer cell migration and is required for appropriate cell-cell adhesion; PTPRD regulates cell migration in cooperation with β-catenin/TCF signaling and its target CD44.\",\n      \"method\": \"Overexpression/knockdown in colon cancer lines, migration assays, cell-cell adhesion assays, signaling pathway analysis\",\n      \"journal\": \"Experimental and therapeutic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — functional assays with pathway placement but single lab, limited mechanistic depth\",\n      \"pmids\": [\"22977525\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Loss-of-function PTPRD mutations (but not methylation or copy number loss) lead to increased STAT3 activation in head and neck cancer; overexpression of wild-type PTPRD inhibits STAT3 phosphorylation and cell growth, whereas PTPRD mutants do not.\",\n      \"method\": \"Transfection of WT vs. mutant PTPRD, immunoblot for pSTAT3, MTT growth assay, methylation-specific PCR\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic link between mutation type and STAT3 substrate activity confirmed in HNSCC cells\",\n      \"pmids\": [\"26267899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTPRD-loss increases CXCL8 expression via ERK and STAT3 signaling pathways, promoting angiogenesis and metastasis in gastric cancer; inhibitors of ERK or STAT3 abrogate PTPRD-loss-induced angiogenesis.\",\n      \"method\": \"Microarray, stable/transient PTPRD knockdown, ELISA, in vitro tube formation, specific kinase inhibitors\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — mechanistic pathway (PTPRD→STAT3/ERK→CXCL8→angiogenesis) established with multiple assays in single lab\",\n      \"pmids\": [\"31805999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Heterozygous PTPRD knockout reduces cocaine self-administration in mice; 7-butoxy illudalic acid analog (7-BIA) identified as a small molecule that targets PTPRD and inhibits its phosphatase activity with some selectivity, reducing cocaine-conditioned place preference in a PTPRD-dependent manner.\",\n      \"method\": \"Heterozygous KO mouse cocaine self-administration, phosphatase inhibition assay with 7-BIA, conditioned place preference with rescue by KO\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro phosphatase inhibition assay plus in vivo genetic rescue (KO specificity), multiple behavioral paradigms\",\n      \"pmids\": [\"30348770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PTPRD phosphatase activity dephosphorylates several brain phosphotyrosine phosphoproteins (identified as candidate substrates by increased phosphorylation in KO vs. WT mice and brisk dephosphorylation by recombinant PTPRD); flavonols (quercetin and other flavonols) positively allosterically modulate PTPRD's dephosphorylation of a substrate-selective subset including GSK3β and GSK3α but not others.\",\n      \"method\": \"KO vs. WT phosphoproteomics, recombinant PTPRD in vitro phosphatase assay, substrate-selective positive allosteric modulation by flavonols\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 — in vitro reconstitution with recombinant enzyme and multiple substrates, substrate selectivity confirmed; single lab\",\n      \"pmids\": [\"35636503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Antibody RD-43 targeting the PTPRD ectodomain triggers PTPRD dimerization, which impairs phosphatase activity; the mAb-PTPRD dimer complex is then degraded via lysosomal and proteasomal pathways independently of secretase cleavage; RD-43 treatment inhibits SRC signaling downstream of PTPRD and suppresses PTPRD-dependent cell invasion in metastatic breast cancer cells.\",\n      \"method\": \"Monoclonal antibody binding to endogenous PTPRD (Co-IP/western), dimerization assay, chemically induced dimerization, phosphatase activity assay, lysosomal/proteasomal inhibitor treatments, SRC signaling immunoblot, invasion assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal methods establishing dimerization-mediated inhibition mechanism, degradation pathway, and downstream SRC signaling consequence in single rigorous study\",\n      \"pmids\": [\"37669874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PTPRD is downregulated in type 2 diabetes by DNMT1-mediated promoter DNA hypermethylation; PTPRD knockdown reduces insulin receptor expression, and overexpression of human insulin receptor PPARγ2 in HepG2 cells induces PTPRD overexpression, indicating PTPRD participates in insulin signaling upstream of the insulin receptor.\",\n      \"method\": \"shRNA knockdown, overexpression in HepG2, bisulfite analysis, DNMT1 inhibitor experiments, T2D mouse model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — mechanistic link to insulin signaling established by knockdown/overexpression and epigenetic analysis, single lab\",\n      \"pmids\": [\"26079428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In mouse PTPRD knockout models, reduced PTPRD expression leads to decreased sleep at the end of active periods, increased locomotion in heterozygotes, and shifted dose-response relationships for cocaine reward, establishing behavioral roles for PTPRD in sleep, locomotion, and drug reward circuits.\",\n      \"method\": \"Heterozygous and homozygous PTPRD knockout mice, behavioral assays (locomotion, cocaine conditioned place preference, sleep assessment)\",\n      \"journal\": \"Molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with defined behavioral phenotypes, but mechanistic pathway not fully resolved\",\n      \"pmids\": [\"26181631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PTPRD suppresses PD-L1 expression in hepatocellular carcinoma cells (HepG2) by downregulating STAT3 and pSTAT3; PTPRD overexpression reduces pSTAT3 and PD-L1, while PTPRD depletion increases them.\",\n      \"method\": \"Overexpression and knockdown in HepG2, western blot for STAT3/pSTAT3/PD-L1\",\n      \"journal\": \"Translational cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — mechanistic pathway placement (PTPRD→STAT3→PD-L1) by gain/loss of function, single lab\",\n      \"pmids\": [\"35117921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PTPRD methylation-mediated silencing (via DNMT1) promotes pulmonary arterial smooth muscle cell migration through the PDGFRB/PLCγ1 axis; PTPRD knockdown rats under hypoxia develop exacerbated pulmonary hypertension with elevated PLCγ1 activity.\",\n      \"method\": \"Stable PTPRD knockdown in PASMCs, DNMT1 inhibition/promoter methylation analysis, PDGFRB/PLCγ1 inhibitor studies, heterozygous PTPRD KO rats with hypoxia-induced PH model\",\n      \"journal\": \"Journal of hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo mechanistic pathway (PTPRD→PDGFRB/PLCγ1→migration) established with KO animal model and specific pathway inhibitors\",\n      \"pmids\": [\"35848503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of PTPRD in mice (Ptprd+/- or Ptprd-/-) increases excitatory and inhibitory cortical neuron numbers persisting into adulthood, impairs both excitatory and inhibitory synaptic function in medial prefrontal cortex, and induces autistic-like behaviors without learning/memory or anxiety deficits.\",\n      \"method\": \"Constitutive heterozygous and homozygous Ptprd KO mice, neuronal counting, electrophysiology, behavioral assays\",\n      \"journal\": \"Biological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with defined synaptic and behavioral phenotypes and neuronal quantification\",\n      \"pmids\": [\"38890753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Neural conditional knockout of PTPRD in the telencephalon reduces glial precursors, astrocytes, and oligodendrocytes; this gliogenic defect results from fewer radial glia at gliogenesis onset and reduced activation of the JAK/STAT pathway and gliogenic gene expression.\",\n      \"method\": \"Conditional KO mouse (telencephalon-specific), cell counting, JAK/STAT pathway immunoblot/immunofluorescence, gliogenic gene expression\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — tissue-specific KO with defined cellular phenotype and pathway identification (JAK/STAT), single lab\",\n      \"pmids\": [\"38487272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PTPRD hypomethylation in pre-adipocytes of first-degree relatives of T2D subjects leads to PTPRD upregulation; overexpression of Ptprd in 3T3-L1 pre-adipocytes inhibits adipogenesis, establishing a functional role for PTPRD in restraining adipogenesis.\",\n      \"method\": \"MeDIP-Seq/RNA-Seq, bisulfite sequencing, Ptprd overexpression in 3T3-L1 cells with adipogenesis readout\",\n      \"journal\": \"Epigenomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — functional overexpression experiment with cellular differentiation phenotype correlated with epigenetic mechanism\",\n      \"pmids\": [\"32483983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PTPRD was identified as a substrate of BACE1 in Alzheimer's disease brain, with reduced PTPRD protein levels confirmed by Western blotting in AD samples.\",\n      \"method\": \"Bioinformatics analysis of BACE1 substrate proteomics dataset; Western blot validation in AD brain tissue\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — computational prediction with single Western blot validation, no direct enzymatic cleavage assay\",\n      \"pmids\": [\"35562959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NSUN2-mediated m5C methylation of PTPRD mRNA enhances its stability in astrocytes following traumatic brain injury; elevated PTPRD promotes A1 astrocyte activation and neuroinflammation, and NSUN2 knockdown attenuates TBI-induced damage by reducing PTPRD levels.\",\n      \"method\": \"RNA immunoprecipitation (m5C-RIP), RNA stability assays, NSUN2 KD and PTPRD OE mouse models, flow cytometry for astrocyte phenotypes, TUNEL\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA methylation writer (NSUN2) identified with RIP validation and in vivo rescue experiment\",\n      \"pmids\": [\"40544933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The human PTPRD gene (HPTP delta) was chromosomally assigned to 9p24 by fluorescence in situ hybridization using human-mouse hybrid cell lines.\",\n      \"method\": \"FISH, somatic cell hybrid panel\",\n      \"journal\": \"Japanese journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct cytogenetic localization by FISH\",\n      \"pmids\": [\"8294211\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PTPRD is a receptor-type protein tyrosine phosphatase that directly dephosphorylates STAT3 (and other substrates including desmoplakin and GSK3β/α) to suppress oncogenic signaling; its ectodomain mediates homotypic dimerization that inhibits phosphatase activity and can be exploited by antibodies to trigger proteasomal/lysosomal degradation; loss of PTPRD stabilizes pSTAT3, activates downstream ERK/CXCL8 and PD-L1 axes, and cooperates with CDKN2A deletion to drive gliomagenesis, while in neurons PTPRD regulates cortical neurogenesis, gliogenesis, and synaptic specification via JAK/STAT pathway modulation, and its mRNA stability is post-transcriptionally regulated by NSUN2-mediated m5C methylation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PTPRD is a receptor-type protein tyrosine phosphatase that functions as a haploinsufficient tumor suppressor and a regulator of neuronal development by directly dephosphorylating substrates including STAT3, desmoplakin, and GSK3β/α [PMID:19478061, PMID:25113440, PMID:35636503]. Loss of PTPRD stabilizes phospho-STAT3, activating downstream oncogenic programs including ERK/CXCL8-driven angiogenesis and PD-L1 upregulation, and cooperates with CDKN2A deletion to drive gliomagenesis and lymphomagenesis in vivo [PMID:24843164, PMID:25138050, PMID:31805999, PMID:35117921]. The PTPRD ectodomain mediates homotypic dimerization that inhibits phosphatase activity, a mechanism exploited by antibodies to trigger proteasomal/lysosomal degradation and suppress SRC-dependent invasion in breast cancer [PMID:37669874]. In the nervous system, PTPRD regulates cortical neurogenesis, gliogenesis via JAK/STAT pathway modulation, and excitatory/inhibitory synaptic function, with its loss producing autistic-like behaviors in mice, and its mRNA stability is post-transcriptionally controlled by NSUN2-mediated m5C methylation [PMID:38890753, PMID:38487272, PMID:40544933].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"The foundational question of PTPRD's identity, genomic location, and expression pattern was resolved: the gene maps to 9p24, encodes a ~210 kDa transmembrane phosphatase with tandem PTP catalytic domains, is expressed in specific brain regions, and generates at least three ectodomain isoforms.\",\n      \"evidence\": \"cDNA cloning, Northern blot, in situ hybridization, and antibody detection of murine PTPRD; FISH mapping of human PTPRD\",\n      \"pmids\": [\"8355697\", \"8294211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No substrates identified at this stage\", \"Functional role of the extracellular Ig/FNIII domain isoforms undefined\", \"No loss-of-function data\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The key mechanistic question of what PTPRD dephosphorylates was answered: STAT3 was identified as a direct substrate, and cancer-associated PTPRD mutations were shown to abrogate phosphatase activity toward STAT3, establishing PTPRD as a tumor suppressor phosphatase.\",\n      \"evidence\": \"Reconstitution of WT versus mutant PTPRD in GBM cells with STAT3 dephosphorylation and growth inhibition assays\",\n      \"pmids\": [\"19478061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo validation of STAT3 regulation by PTPRD not yet established\", \"Full substrate repertoire unknown\", \"Mechanism of PTPRD inactivation in cancer beyond point mutations unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Three independent studies expanded the functional picture: in vivo genetic models proved that heterozygous Ptprd loss is sufficient to elevate pSTAT3 and cooperate with CDKN2A deletion to drive gliomas and lymphomas, while substrate-trap proteomics identified desmoplakin as an additional substrate linking PTPRD to cell migration and adhesion.\",\n      \"evidence\": \"RCAS/tv-a glioma mouse models with Ptprd/Cdkn2a co-deletion; Ptprd/Cdkn2a double-KO tumor spectrum analysis; substrate-trap mutagenesis with mass spectrometry in cancer cell lines\",\n      \"pmids\": [\"24843164\", \"25138050\", \"25113440\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for substrate selectivity unknown\", \"Whether desmoplakin dephosphorylation is physiologically relevant in vivo not tested\", \"Mechanism of haploinsufficiency versus dominant-negative effects not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"PTPRD's STAT3-targeting role was extended to head and neck cancer, and behavioral genetics revealed that Ptprd dosage modulates sleep, locomotion, and cocaine reward in mice, establishing neurological functions beyond development.\",\n      \"evidence\": \"WT/mutant PTPRD transfection with pSTAT3 immunoblot in HNSCC cells; heterozygous/homozygous KO mouse behavioral assays\",\n      \"pmids\": [\"26267899\", \"26181631\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Neural substrates mediating behavioral phenotypes not identified\", \"Whether STAT3 mediates PTPRD's behavioral effects unclear\", \"PTPRD's role in specific neural circuits not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Pharmacological targeting of PTPRD became feasible: 7-BIA was identified as a small-molecule phosphatase inhibitor with in vivo efficacy in reducing cocaine conditioned place preference in a PTPRD-dependent manner.\",\n      \"evidence\": \"In vitro phosphatase inhibition assay; PTPRD heterozygous KO rescue of behavioral effect of 7-BIA\",\n      \"pmids\": [\"30348770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"7-BIA selectivity across the PTP family not fully profiled\", \"Neural circuit mechanism of PTPRD in reward not established\", \"Therapeutic window and off-target effects undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Downstream consequences of PTPRD loss were elaborated: PTPRD deficiency activates ERK and STAT3 to upregulate CXCL8, promoting angiogenesis and metastasis in gastric cancer.\",\n      \"evidence\": \"Microarray, PTPRD knockdown, ELISA for CXCL8, tube formation assay, ERK/STAT3 inhibitor rescue\",\n      \"pmids\": [\"31805999\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PTPRD directly dephosphorylates ERK or acts indirectly not resolved\", \"In vivo validation of angiogenesis pathway limited\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The substrate repertoire and signaling consequences of PTPRD were broadened: GSK3β/α were identified as brain substrates with substrate-selective allosteric modulation by flavonols; PTPRD was shown to suppress PD-L1 via STAT3; and PTPRD loss was linked to PDGFRB/PLCγ1-driven smooth muscle cell migration and pulmonary hypertension.\",\n      \"evidence\": \"KO versus WT phosphoproteomics with recombinant PTPRD in vitro assay; PTPRD overexpression/knockdown in HepG2 for PD-L1; PTPRD KO rats under hypoxia with PDGFRB/PLCγ1 inhibitor studies\",\n      \"pmids\": [\"35636503\", \"35117921\", \"35848503\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis for substrate-selective allosteric modulation by flavonols unknown\", \"Whether PTPRD directly dephosphorylates PDGFRB not demonstrated\", \"PD-L1 regulation not tested in vivo or in immune-competent models\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The regulatory mechanism of PTPRD's ectodomain was elucidated: antibody-induced homotypic dimerization inhibits phosphatase activity and targets the receptor for lysosomal/proteasomal degradation, suppressing SRC signaling and invasion in breast cancer.\",\n      \"evidence\": \"Monoclonal antibody RD-43 binding, dimerization assay, chemically induced dimerization, phosphatase activity measurement, degradation pathway dissection with inhibitors, SRC immunoblot, invasion assay\",\n      \"pmids\": [\"37669874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether dimerization-mediated inhibition occurs physiologically via endogenous ligands unknown\", \"Crystal structure of dimerized PTPRD ectodomain not available\", \"In vivo therapeutic efficacy of RD-43 not demonstrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"PTPRD's roles in cortical development were mechanistically defined: loss increases both excitatory and inhibitory neuron numbers and impairs synaptic function causing autistic-like behaviors, while neural-specific deletion reduces gliogenesis by lowering JAK/STAT pathway activation in radial glia.\",\n      \"evidence\": \"Constitutive and conditional PTPRD KO mice with neuronal counting, electrophysiology, behavioral assays, and JAK/STAT immunoblot/immunofluorescence\",\n      \"pmids\": [\"38890753\", \"38487272\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific PTPRD substrates mediating cortical neurogenesis versus gliogenesis decisions unidentified\", \"Relationship between synaptic dysfunction and behavioral phenotype at circuit level not resolved\", \"Whether JAK/STAT regulation by PTPRD in glia involves direct JAK dephosphorylation unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Post-transcriptional regulation of PTPRD was uncovered: NSUN2-mediated m5C methylation stabilizes PTPRD mRNA in astrocytes after traumatic brain injury, promoting A1 astrocyte activation and neuroinflammation.\",\n      \"evidence\": \"m5C-RIP, RNA stability assays, NSUN2 knockdown and PTPRD overexpression mouse models, astrocyte phenotyping by flow cytometry\",\n      \"pmids\": [\"40544933\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific m5C sites on PTPRD mRNA and their individual contributions not mapped\", \"Whether NSUN2-PTPRD axis operates in other neuroinflammatory contexts untested\", \"Reader protein interpreting m5C on PTPRD mRNA not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the full physiological substrate repertoire of PTPRD in neurons versus non-neuronal tissues; the structural basis of substrate selectivity and allosteric regulation; whether endogenous trans-ligands trigger dimerization-mediated inhibition in vivo; and the precise mechanism by which PTPRD loss leads to both increased neurogenesis and impaired gliogenesis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of full-length PTPRD or substrate-bound catalytic domain\", \"Endogenous extracellular ligands that regulate dimerization not identified\", \"Relationship between STAT3 dephosphorylation and SRC regulation not integrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 2, 9, 10, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 7, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 7, 8, 14, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 3, 7, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [16, 17]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [9, 13, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"STAT3\",\n      \"DSP\",\n      \"GSK3B\",\n      \"GSK3A\",\n      \"SRC\",\n      \"NSUN2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}