{"gene":"PAGR1","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":2016,"finding":"PAGR1 (PA1) forms a subcomplex with PTIP that functions independently from the associated MLL3/MLL4 histone methyltransferase complex to promote transcription at the immunoglobulin heavy chain locus during class switch recombination (CSR). A tandem BRCT domain of PTIP was identified as sufficient for CSR and PA1 was identified as its main functional protein partner by quantitative proteomics in primary lymphocytes.","method":"Quantitative proteomics, genetic dissection of PTIP structural requirements, primary lymphocyte functional assays (CSR), biochemical separation of complexes","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal biochemical (quantitative proteomics) combined with genetic epistasis and functional CSR assays in primary lymphocytes; single lab but multiple orthogonal methods","pmids":["26744420"],"is_preprint":false},{"year":2012,"finding":"PAGR1 (PA1) acts as a competitive decelerator of glucocorticoid receptor (GR) transactivation, suppressing agonist maximal activity (Amax), increasing EC50, and reducing partial agonist activity (PAA) of an exogenous reporter. PA1 binds strongly to the C-terminal half of GR, acts independently of associated PTIP, reverses effects of coactivator TIF2, and inhibits endogenous GR target genes (IGFBP1, IP6K3) via distinct mechanisms: increasing GR dissociation from the IGFBP1 promoter while blocking GR binding at the IP6K3 promoter, as shown by ChIP and re-ChIP.","method":"Reporter gene assays, competition assays with TIF2 and SMRT, co-immunoprecipitation/binding assays, ChIP and re-ChIP on endogenous genes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assays, ChIP/re-ChIP, binding assays, endogenous gene analysis) in a single focused study on this protein","pmids":["23161582"],"is_preprint":false},{"year":2020,"finding":"PAGR1 cooperates with phosphorylated CREB and ligand-activated glucocorticoid receptor to directly control the induction of C/EBPβ and C/EBPδ transcription factors in the early phase of adipogenesis. Deletion of Pagr1 in white and brown preadipocytes prevents induction of C/EBPβ and C/EBPδ and causes severe adipogenesis defects, which can be rescued by ectopic expression of C/EBPβ or PPARγ. Deletion of Pagr1 in Myf5+ precursor cells impairs brown adipose tissue and muscle development.","method":"Conditional gene knockout in preadipocytes, ectopic expression rescue experiments, transcription factor induction assays, genetic deletion in Myf5+ lineage in vivo","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular and in vivo phenotype, epistasis rescue experiments, multiple cell types tested; single lab but multiple orthogonal approaches","pmids":["32601106"],"is_preprint":false},{"year":2023,"finding":"PAXIP1 (PTIP)-PAGR1 complex promotes global chromatin association of cohesin independent of DNA replication. Depletion of PAXIP1 severely aggravates cohesion defects in ESCO2 mutant cells, leading to mitotic cell death. This cohesin regulatory function requires PAGR1 and a conserved FDF motif in PAGR1. PAXIP1 co-localizes with cohesin on active gene promoters and enhancers.","method":"CRISPR synthetic lethality screens, siRNA depletion, ChIP-seq co-localization, analysis of cohesion defects in ESCO2 mutant cell lines, domain-function mapping (FDF motif requirement)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR screens combined with mechanistic follow-up (co-localization, depletion phenotypes, motif mapping) using multiple orthogonal methods in a single study","pmids":["37702151"],"is_preprint":false},{"year":2022,"finding":"PA1 is required for blood-testis barrier (BTB) integrity in Sertoli cells. Sertoli cell-specific Pa1 knockout in mice caused azoospermia-like phenotype with cytoskeletal disorganization at ectoplasmic specializations and BTB disruption. Transcriptomic and CUT&TAG analyses showed PA1 regulates expression of BTB-associated genes including Connexin43 (Cx43). PA1 regulation of Cx43 expression depends on its interaction with JUN (AP-1 transcription factor), demonstrated by co-immunoprecipitation.","method":"Sertoli cell-specific conditional knockout, transcriptomics, CUT&TAG chromatin profiling, co-immunoprecipitation (PA1-JUN interaction), immunofluorescence localization","journal":"Cell & bioscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with specific phenotypic readout, CUT&TAG, co-IP for binding partner, and transcriptomic analysis; single lab with multiple orthogonal methods","pmids":["35379345"],"is_preprint":false},{"year":2021,"finding":"Bi-allelic missense variants in PAGR1 (c.274A>G; p.Ser92Gly) are associated with severe microcephaly and neurodevelopmental disorder in humans, and complete knockout of murine Pagr1a is embryonic lethal, establishing a required developmental role for this component of the MLL2/MLL3 histone methyltransferase complex.","method":"Exome and genome sequencing in two unrelated families, identification of shared homozygous variant; cited murine Pagr1a knockout lethality data","journal":"American journal of medical genetics. Part A","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — human genetics (variant identification) combined with reference to murine KO lethality; mechanistic inference limited; single report with no functional reconstitution","pmids":["34585832"],"is_preprint":false}],"current_model":"PAGR1 (PA1) is a nuclear protein that associates with PTIP and the MLL3/MLL4 histone methyltransferase complex; it forms a PTIP-PA1 subcomplex that acts independently of MLL3/MLL4 to promote transcription during immunoglobulin class switch recombination, functions as a competitive decelerator of glucocorticoid receptor transactivation by binding the GR C-terminal domain and acting at multiple transcriptional steps, cooperates with phospho-CREB and the glucocorticoid receptor to induce C/EBPβ/δ and drive adipogenesis, promotes global chromatin association of cohesin via a conserved FDF motif in a PAXIP1-PAGR1 complex, and maintains blood-testis barrier integrity in Sertoli cells by regulating Connexin43 expression through interaction with the AP-1 factor JUN."},"narrative":{"mechanistic_narrative":"PAGR1 (PA1) is a nuclear protein that functions as a transcriptional and chromatin regulator, operating principally as the main functional partner of PTIP/PAXIP1 in a PTIP-PA1 subcomplex that can act independently of the associated MLL3/MLL4 histone methyltransferase complex [PMID:26744420]. Through this subcomplex it promotes transcription at the immunoglobulin heavy chain locus during class switch recombination [PMID:26744420] and, via a conserved FDF motif in PAGR1, drives global chromatin association of cohesin on active promoters and enhancers, a function whose loss aggravates cohesion defects to the point of mitotic death in ESCO2-mutant cells [PMID:37702151]. PAGR1 also serves as a context-specific modulator of nuclear receptor signaling: it binds the C-terminal half of the glucocorticoid receptor and acts as a competitive decelerator of GR transactivation, lowering maximal agonist activity and altering GR occupancy at endogenous targets such as IGFBP1 and IP6K3 [PMID:23161582], yet in the early phase of adipogenesis it cooperates with phospho-CREB and ligand-activated GR to induce C/EBPβ and C/EBPδ and is required for adipocyte and Myf5+ lineage development [PMID:32601106]. In Sertoli cells, PAGR1 maintains blood-testis barrier integrity by interacting with the AP-1 factor JUN to regulate Connexin43 expression [PMID:35379345]. Consistent with these broad developmental roles, bi-allelic PAGR1 missense variants cause severe microcephaly and neurodevelopmental disorder in humans, and murine knockout is embryonic lethal [PMID:34585832].","teleology":[{"year":2012,"claim":"Established that beyond its chromatin-complex association PAGR1 directly tunes nuclear receptor output, answering how it intersects with hormone signaling.","evidence":"Reporter assays, TIF2/SMRT competition, binding assays, and ChIP/re-ChIP on endogenous GR targets","pmids":["23161582"],"confidence":"High","gaps":["Structural basis of PA1 binding to the GR C-terminal half not resolved","Whether GR deceleration is PTIP-independent in all contexts not established","No genome-wide map of GR genes affected"]},{"year":2016,"claim":"Defined PA1 as the principal functional partner of the PTIP BRCT domains and showed the PTIP-PA1 subcomplex can act separately from MLL3/MLL4, clarifying the modular architecture of PTIP-associated transcription.","evidence":"Quantitative proteomics, genetic dissection of PTIP, and CSR functional assays in primary lymphocytes","pmids":["26744420"],"confidence":"High","gaps":["Molecular mechanism by which the subcomplex promotes transcription at the IgH locus unresolved","Direct DNA/chromatin contacts of PA1 not mapped"]},{"year":2020,"claim":"Showed PAGR1 is genetically required for adipogenesis and lineage development, moving it from in vitro transcriptional modulator to a developmental driver acting upstream of C/EBP factors.","evidence":"Conditional knockout in white/brown preadipocytes and Myf5+ cells with C/EBPβ/PPARγ rescue","pmids":["32601106"],"confidence":"High","gaps":["Direct chromatin targets of the PAGR1/phospho-CREB/GR cooperation not defined","Mechanism linking PAGR1 to CREB phosphorylation status unknown"]},{"year":2021,"claim":"Linked PAGR1 to human disease, establishing an essential developmental requirement for the gene.","evidence":"Exome/genome sequencing in two families identifying a shared homozygous missense variant, with cited murine knockout lethality","pmids":["34585832"],"confidence":"Medium","gaps":["No functional reconstitution of the p.Ser92Gly variant","Single report, two families","Mechanism connecting PAGR1 loss to microcephaly not established"]},{"year":2022,"claim":"Identified a tissue-specific role in blood-testis barrier maintenance and a new transcriptional partner (JUN), broadening PAGR1's regulatory repertoire beyond PTIP and GR.","evidence":"Sertoli-specific conditional knockout, transcriptomics, CUT&TAG, and PA1-JUN co-immunoprecipitation","pmids":["35379345"],"confidence":"High","gaps":["PA1-JUN interaction shown by single co-IP without reciprocal/structural validation","Whether Cx43 regulation requires the PTIP complex unknown"]},{"year":2023,"claim":"Demonstrated a replication-independent role for the PAXIP1-PAGR1 complex in loading cohesin globally, defining a distinct chromatin-organization function requiring the PAGR1 FDF motif.","evidence":"CRISPR synthetic lethality screens, siRNA depletion, ChIP-seq co-localization, and FDF motif mapping in ESCO2-mutant cells","pmids":["37702151"],"confidence":"High","gaps":["How the complex mechanistically recruits or stabilizes cohesin not resolved","Direct PAGR1-cohesin contacts not biochemically defined"]},{"year":null,"claim":"How PAGR1's distinct activities — PTIP subcomplex transcription, cohesin loading, GR deceleration, adipogenic induction, and JUN-dependent barrier regulation — are coordinated or selected in different cell types remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying biochemical model linking the partner-specific functions","No structure of PAGR1 or its complexes","Mechanism of context-dependent partner choice unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,4]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1,3,4]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1,2,4]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[3]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0]}],"complexes":["PTIP-PA1 subcomplex","MLL3/MLL4 (MLL2/MLL3) histone methyltransferase complex"],"partners":["PAXIP1","JUN","NR3C1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BTK6","full_name":"PAXIP1-associated glutamate-rich protein 1","aliases":["Glutamate-rich coactivator interacting with SRC1","GAS","PAXIP1-associated protein 1","PTIP-associated protein 1"],"length_aa":254,"mass_kda":27.7,"function":"Its association with the histone methyltransferase MLL2/MLL3 complex is suggesting a role in epigenetic transcriptional activation. However, in association with PAXIP1/PTIP is proposed to function at least in part independently of the MLL2/MLL3 complex. Proposed to be recruited by PAXIP1 to sites of DNA damage where the PAGR1:PAXIP1 complex is required for cell survival in response to DNA damage independently of the MLL2/MLL3 complex (PubMed:19124460). However, its function in DNA damage has been questioned (By similarity). During immunoglobulin class switching in activated B-cells is involved in transcription regulation of downstream switch regions at the immunoglobulin heavy-chain (Igh) locus independently of the MLL2/MLL3 complex (By similarity). Involved in both estrogen receptor-regulated gene transcription and estrogen-stimulated G1/S cell-cycle transition (PubMed:19039327). Acts as a transcriptional cofactor for nuclear hormone receptors. Inhibits the induction properties of several steroid receptors such as NR3C1, AR and PPARG; the mechanism of inhibition appears to be gene-dependent (PubMed:23161582)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9BTK6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PAGR1","classification":"Not Classified","n_dependent_lines":251,"n_total_lines":1208,"dependency_fraction":0.2077814569536424},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PAGR1","total_profiled":1310},"omim":[{"mim_id":"612033","title":"PAXIP1-ASSOCIATED GLUTAMATE-RICH PROTEIN 1; PAGR1","url":"https://www.omim.org/entry/612033"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":54.3}],"url":"https://www.proteinatlas.org/search/PAGR1"},"hgnc":{"alias_symbol":["MGC4606","GAS","PA1"],"prev_symbol":["C16orf53"]},"alphafold":{"accession":"Q9BTK6","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BTK6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BTK6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BTK6-F1-predicted_aligned_error_v6.png","plddt_mean":62.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PAGR1","jax_strain_url":"https://www.jax.org/strain/search?query=PAGR1"},"sequence":{"accession":"Q9BTK6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BTK6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BTK6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BTK6"}},"corpus_meta":[{"pmid":"1514784","id":"PMC_1514784","title":"Cloning, expression, and nucleotide sequence of genes involved in production of pediocin PA-1, and bacteriocin from Pediococcus acidilactici PAC1.0.","date":"1992","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/1514784","citation_count":227,"is_preprint":false},{"pmid":"8285666","id":"PMC_8285666","title":"Pediocin PA-1, a bacteriocin from Pediococcus acidilactici PAC1.0, forms hydrophilic pores in the cytoplasmic membrane of target cells.","date":"1993","source":"Applied and environmental microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/8285666","citation_count":181,"is_preprint":false},{"pmid":"11934133","id":"PMC_11934133","title":"Pediocin PA-1, a wide-spectrum bacteriocin from lactic acid bacteria.","date":"2002","source":"Critical reviews in food science and nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/11934133","citation_count":148,"is_preprint":false},{"pmid":"6740333","id":"PMC_6740333","title":"An activated rasN gene: detected in late but not early passage human PA1 teratocarcinoma cells.","date":"1984","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/6740333","citation_count":141,"is_preprint":false},{"pmid":"3997842","id":"PMC_3997842","title":"Embryonal lactosaminoglycan. 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A tandem BRCT domain of PTIP was identified as sufficient for CSR and PA1 was identified as its main functional protein partner by quantitative proteomics in primary lymphocytes.\",\n      \"method\": \"Quantitative proteomics, genetic dissection of PTIP structural requirements, primary lymphocyte functional assays (CSR), biochemical separation of complexes\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal biochemical (quantitative proteomics) combined with genetic epistasis and functional CSR assays in primary lymphocytes; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"26744420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PAGR1 (PA1) acts as a competitive decelerator of glucocorticoid receptor (GR) transactivation, suppressing agonist maximal activity (Amax), increasing EC50, and reducing partial agonist activity (PAA) of an exogenous reporter. PA1 binds strongly to the C-terminal half of GR, acts independently of associated PTIP, reverses effects of coactivator TIF2, and inhibits endogenous GR target genes (IGFBP1, IP6K3) via distinct mechanisms: increasing GR dissociation from the IGFBP1 promoter while blocking GR binding at the IP6K3 promoter, as shown by ChIP and re-ChIP.\",\n      \"method\": \"Reporter gene assays, competition assays with TIF2 and SMRT, co-immunoprecipitation/binding assays, ChIP and re-ChIP on endogenous genes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assays, ChIP/re-ChIP, binding assays, endogenous gene analysis) in a single focused study on this protein\",\n      \"pmids\": [\"23161582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PAGR1 cooperates with phosphorylated CREB and ligand-activated glucocorticoid receptor to directly control the induction of C/EBPβ and C/EBPδ transcription factors in the early phase of adipogenesis. Deletion of Pagr1 in white and brown preadipocytes prevents induction of C/EBPβ and C/EBPδ and causes severe adipogenesis defects, which can be rescued by ectopic expression of C/EBPβ or PPARγ. Deletion of Pagr1 in Myf5+ precursor cells impairs brown adipose tissue and muscle development.\",\n      \"method\": \"Conditional gene knockout in preadipocytes, ectopic expression rescue experiments, transcription factor induction assays, genetic deletion in Myf5+ lineage in vivo\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular and in vivo phenotype, epistasis rescue experiments, multiple cell types tested; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"32601106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PAXIP1 (PTIP)-PAGR1 complex promotes global chromatin association of cohesin independent of DNA replication. Depletion of PAXIP1 severely aggravates cohesion defects in ESCO2 mutant cells, leading to mitotic cell death. This cohesin regulatory function requires PAGR1 and a conserved FDF motif in PAGR1. PAXIP1 co-localizes with cohesin on active gene promoters and enhancers.\",\n      \"method\": \"CRISPR synthetic lethality screens, siRNA depletion, ChIP-seq co-localization, analysis of cohesion defects in ESCO2 mutant cell lines, domain-function mapping (FDF motif requirement)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR screens combined with mechanistic follow-up (co-localization, depletion phenotypes, motif mapping) using multiple orthogonal methods in a single study\",\n      \"pmids\": [\"37702151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PA1 is required for blood-testis barrier (BTB) integrity in Sertoli cells. Sertoli cell-specific Pa1 knockout in mice caused azoospermia-like phenotype with cytoskeletal disorganization at ectoplasmic specializations and BTB disruption. Transcriptomic and CUT&TAG analyses showed PA1 regulates expression of BTB-associated genes including Connexin43 (Cx43). PA1 regulation of Cx43 expression depends on its interaction with JUN (AP-1 transcription factor), demonstrated by co-immunoprecipitation.\",\n      \"method\": \"Sertoli cell-specific conditional knockout, transcriptomics, CUT&TAG chromatin profiling, co-immunoprecipitation (PA1-JUN interaction), immunofluorescence localization\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with specific phenotypic readout, CUT&TAG, co-IP for binding partner, and transcriptomic analysis; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35379345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Bi-allelic missense variants in PAGR1 (c.274A>G; p.Ser92Gly) are associated with severe microcephaly and neurodevelopmental disorder in humans, and complete knockout of murine Pagr1a is embryonic lethal, establishing a required developmental role for this component of the MLL2/MLL3 histone methyltransferase complex.\",\n      \"method\": \"Exome and genome sequencing in two unrelated families, identification of shared homozygous variant; cited murine Pagr1a knockout lethality data\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — human genetics (variant identification) combined with reference to murine KO lethality; mechanistic inference limited; single report with no functional reconstitution\",\n      \"pmids\": [\"34585832\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PAGR1 (PA1) is a nuclear protein that associates with PTIP and the MLL3/MLL4 histone methyltransferase complex; it forms a PTIP-PA1 subcomplex that acts independently of MLL3/MLL4 to promote transcription during immunoglobulin class switch recombination, functions as a competitive decelerator of glucocorticoid receptor transactivation by binding the GR C-terminal domain and acting at multiple transcriptional steps, cooperates with phospho-CREB and the glucocorticoid receptor to induce C/EBPβ/δ and drive adipogenesis, promotes global chromatin association of cohesin via a conserved FDF motif in a PAXIP1-PAGR1 complex, and maintains blood-testis barrier integrity in Sertoli cells by regulating Connexin43 expression through interaction with the AP-1 factor JUN.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PAGR1 (PA1) is a nuclear protein that functions as a transcriptional and chromatin regulator, operating principally as the main functional partner of PTIP/PAXIP1 in a PTIP-PA1 subcomplex that can act independently of the associated MLL3/MLL4 histone methyltransferase complex [#0]. Through this subcomplex it promotes transcription at the immunoglobulin heavy chain locus during class switch recombination [#0] and, via a conserved FDF motif in PAGR1, drives global chromatin association of cohesin on active promoters and enhancers, a function whose loss aggravates cohesion defects to the point of mitotic death in ESCO2-mutant cells [#3]. PAGR1 also serves as a context-specific modulator of nuclear receptor signaling: it binds the C-terminal half of the glucocorticoid receptor and acts as a competitive decelerator of GR transactivation, lowering maximal agonist activity and altering GR occupancy at endogenous targets such as IGFBP1 and IP6K3 [#1], yet in the early phase of adipogenesis it cooperates with phospho-CREB and ligand-activated GR to induce C/EBP\\u03b2 and C/EBP\\u03b4 and is required for adipocyte and Myf5+ lineage development [#2]. In Sertoli cells, PAGR1 maintains blood-testis barrier integrity by interacting with the AP-1 factor JUN to regulate Connexin43 expression [#4]. Consistent with these broad developmental roles, bi-allelic PAGR1 missense variants cause severe microcephaly and neurodevelopmental disorder in humans, and murine knockout is embryonic lethal [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established that beyond its chromatin-complex association PAGR1 directly tunes nuclear receptor output, answering how it intersects with hormone signaling.\",\n      \"evidence\": \"Reporter assays, TIF2/SMRT competition, binding assays, and ChIP/re-ChIP on endogenous GR targets\",\n      \"pmids\": [\"23161582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PA1 binding to the GR C-terminal half not resolved\", \"Whether GR deceleration is PTIP-independent in all contexts not established\", \"No genome-wide map of GR genes affected\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined PA1 as the principal functional partner of the PTIP BRCT domains and showed the PTIP-PA1 subcomplex can act separately from MLL3/MLL4, clarifying the modular architecture of PTIP-associated transcription.\",\n      \"evidence\": \"Quantitative proteomics, genetic dissection of PTIP, and CSR functional assays in primary lymphocytes\",\n      \"pmids\": [\"26744420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which the subcomplex promotes transcription at the IgH locus unresolved\", \"Direct DNA/chromatin contacts of PA1 not mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed PAGR1 is genetically required for adipogenesis and lineage development, moving it from in vitro transcriptional modulator to a developmental driver acting upstream of C/EBP factors.\",\n      \"evidence\": \"Conditional knockout in white/brown preadipocytes and Myf5+ cells with C/EBP\\u03b2/PPAR\\u03b3 rescue\",\n      \"pmids\": [\"32601106\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct chromatin targets of the PAGR1/phospho-CREB/GR cooperation not defined\", \"Mechanism linking PAGR1 to CREB phosphorylation status unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked PAGR1 to human disease, establishing an essential developmental requirement for the gene.\",\n      \"evidence\": \"Exome/genome sequencing in two families identifying a shared homozygous missense variant, with cited murine knockout lethality\",\n      \"pmids\": [\"34585832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional reconstitution of the p.Ser92Gly variant\", \"Single report, two families\", \"Mechanism connecting PAGR1 loss to microcephaly not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a tissue-specific role in blood-testis barrier maintenance and a new transcriptional partner (JUN), broadening PAGR1's regulatory repertoire beyond PTIP and GR.\",\n      \"evidence\": \"Sertoli-specific conditional knockout, transcriptomics, CUT&TAG, and PA1-JUN co-immunoprecipitation\",\n      \"pmids\": [\"35379345\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"PA1-JUN interaction shown by single co-IP without reciprocal/structural validation\", \"Whether Cx43 regulation requires the PTIP complex unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated a replication-independent role for the PAXIP1-PAGR1 complex in loading cohesin globally, defining a distinct chromatin-organization function requiring the PAGR1 FDF motif.\",\n      \"evidence\": \"CRISPR synthetic lethality screens, siRNA depletion, ChIP-seq co-localization, and FDF motif mapping in ESCO2-mutant cells\",\n      \"pmids\": [\"37702151\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the complex mechanistically recruits or stabilizes cohesin not resolved\", \"Direct PAGR1-cohesin contacts not biochemically defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How PAGR1's distinct activities — PTIP subcomplex transcription, cohesin loading, GR deceleration, adipogenic induction, and JUN-dependent barrier regulation — are coordinated or selected in different cell types remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying biochemical model linking the partner-specific functions\", \"No structure of PAGR1 or its complexes\", \"Mechanism of context-dependent partner choice unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 4]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1, 3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1, 2, 4]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"PTIP-PA1 subcomplex\", \"MLL3/MLL4 (MLL2/MLL3) histone methyltransferase complex\"],\n    \"partners\": [\"PAXIP1\", \"JUN\", \"NR3C1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}