{"gene":"RBPJL","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1997,"finding":"RBP-L (RBPJL) binds to a DNA sequence almost identical to that recognized by RBP-J (the mammalian Suppressor of Hairless homologue), but unlike RBP-J, RBP-L does not interact with any of the four known mouse Notch intracellular domains, making it Notch-independent.","method":"DNA-binding assays; in vivo and in vitro protein-protein interaction assays (co-immunoprecipitation, GST pulldown)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (DNA binding, multiple protein interaction assays) in a single study; foundational characterization paper with 115 citations","pmids":["9111338"],"is_preprint":false},{"year":2006,"finding":"RBPJL functions as the third subunit of the trimeric PTF1 transcription complex in mature pancreatic acinar cells. P48/PTF1a interacts with RBPJL through two conserved tryptophan-containing motifs. Unlike RBP-J, RBPJL does not bind the Notch intracellular domain, making PTF1-L activity Notch-independent.","method":"Co-immunoprecipitation, pulldown assays, mutagenesis of tryptophan motifs, transcriptional reporter assays, chromatin immunoprecipitation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (Co-IP, mutagenesis, ChIP, reporter assays), replicated by subsequent studies, 169 citations","pmids":["16354684"],"is_preprint":false},{"year":2010,"finding":"Replacement of RBPJ by RBPJL in the PTF1 complex (forming PTF1-L) drives the final maturation of pancreatic acinar cells, maximizing expression of digestive enzyme genes, secretory apparatus components, and mitochondrial metabolism genes. Loss of Rbpjl causes PTF1-J to persist and substitute for PTF1-L, reducing expression of ~50 genes (90% direct PTF1-L targets) including those encoding digestive enzymes.","method":"Conditional Rbpjl knockout mouse model; comprehensive mRNA profiling; chromatin immunoprecipitation (ChIP) to identify PTF1-L binding at regulatory sites","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, ChIP for direct target identification, corroborates biochemical findings from PTF1 complex studies","pmids":["20398665"],"is_preprint":false},{"year":1999,"finding":"RBP-L (RBPJL) is expressed in a cell-type-specific manner: the upstream promoter drives expression in neurons (layer VI cortex, hippocampal pyramidal cells, dentate gyrus granule cells), while a downstream promoter is active in lung. Neuronal upstream promoter activity is regulated by neuronal activity.","method":"Targeted gene disruption with in-frame nlacZ reporter replacement; beta-galactosidase histochemistry; quantitative RT-PCR","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — direct knockin reporter experiment establishing cell-type-specific promoter usage; single study","pmids":["10502683"],"is_preprint":false},{"year":2001,"finding":"The Rbpjl gene overlaps antisense with the Matn4 (matrilin-4) gene at the mouse chromosome 2 locus; RBPJL is expressed most highly in lung and brain, with a major transcript initiated ~150 nt upstream of the first intron splice acceptor, producing a truncated variant lacking the N-terminal 121 amino acids.","method":"Genomic cloning, RT-PCR, quantitative RT-PCR, in situ hybridization, transcription start site mapping","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — direct genomic and expression characterization; single study establishing locus organization and expression","pmids":["11549321"],"is_preprint":false},{"year":2018,"finding":"A population-specific p.(Thr280Met) variant in RBPJL reduces protein stability (not mRNA levels) and impairs transactivation of RBPJL-responsive promoters (including CTRB1 promoter). Knockdown of Rbpjl in mouse pancreatic acinar cells reduces expression of exocrine enzyme genes including Ctrb.","method":"Luciferase transactivation assays in HEK293 cells; overexpression in mouse pancreatic acinar cells; siRNA knockdown; comparison of protein vs. mRNA levels of Met280 vs. Thr280 alleles","journal":"European journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional assays (reporter, overexpression, knockdown) in a single study; moderate evidence for mechanism","pmids":["29302047"],"is_preprint":false},{"year":2022,"finding":"RBPJL binds to the promoter region of Arid5a and represses its transcription, thereby suppressing the IL-6/STAT3 signaling axis in pancreatic acinar cells. This anti-inflammatory mechanism attenuates acute pancreatitis.","method":"ChIP assay, EMSA, dual-luciferase reporter assay, overexpression and knockdown in pancreatic acinar cells, in vivo cerulein-induced acute pancreatitis mouse model","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, EMSA, luciferase) establishing direct promoter binding; single lab study","pmids":["35725649"],"is_preprint":false},{"year":2025,"finding":"FAM102A interacts with RBPJL and promotes its nuclear translocation together with RUNX2, enhancing expression of Osterix (SP7) and thereby driving osteoblast differentiation. Deletion of Fam102a or a functional mutation in Rbpjl leads to osteopenia with reduced osteoblastic bone formation.","method":"Co-immunoprecipitation (Fam102a-Rbpjl interaction), nuclear translocation assays, conditional knockout mice (Fam102a deletion and Rbpjl functional mutation), bone histomorphometry","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus KO mouse phenotype with defined cellular readout; single study","pmids":["39747056"],"is_preprint":false}],"current_model":"RBPJL is a sequence-specific DNA-binding transcription factor that functions as the third subunit of the trimeric PTF1 complex in mature pancreatic acinar cells (PTF1-L), where it drives final acinar differentiation by directly activating digestive enzyme and secretory genes in a Notch-independent manner; it also represses Arid5a transcription to suppress IL-6/STAT3 signaling, participates in osteoblast differentiation via FAM102A-mediated nuclear translocation, and shows cell-type-specific expression controlled by distinct promoters in lung and neurons."},"narrative":{"teleology":[{"year":1997,"claim":"The discovery that RBP-L binds the same DNA motif as RBP-J yet cannot interact with any Notch intracellular domain established RBPJL as a Notch-independent paralogue, raising the question of what transcriptional programs it controls independently of Notch signaling.","evidence":"DNA-binding assays, co-immunoprecipitation, and GST pulldown in mammalian cells","pmids":["9111338"],"confidence":"High","gaps":["No endogenous target genes or tissue-specific functions identified","Physiological protein partners beyond Notch remained unknown","Whether RBPJL participates in a larger transcription complex was untested"]},{"year":1999,"claim":"Knockin reporter experiments revealed that RBPJL expression is controlled by two distinct promoters — an upstream neuronal promoter active in cortical and hippocampal neurons and a downstream promoter active in lung — establishing cell-type specificity and raising the question of distinct functions across tissues.","evidence":"Targeted nlacZ knockin replacement, β-galactosidase histochemistry, and quantitative RT-PCR in mouse brain and lung","pmids":["10502683"],"confidence":"Medium","gaps":["Pancreatic expression and its regulatory elements were not characterized in this study","Functional consequence of RBPJL loss in neurons was not assessed","Neuronal target genes remain unidentified"]},{"year":2001,"claim":"Genomic characterization showed the Rbpjl locus overlaps antisense with Matn4 and produces a truncated transcript variant lacking 121 N-terminal amino acids, clarifying locus architecture but leaving variant-specific function unresolved.","evidence":"Genomic cloning, RT-PCR, in situ hybridization, and transcription start site mapping in mouse tissues","pmids":["11549321"],"confidence":"Medium","gaps":["Functional significance of the truncated N-terminal variant is unknown","Whether antisense overlap with Matn4 has regulatory consequences was not tested"]},{"year":2006,"claim":"Identification of RBPJL as the third subunit of the PTF1-L trimeric complex — recruited by PTF1a/p48 through two tryptophan motifs — established the molecular basis for Notch-independent transcriptional control in pancreatic acinar cells.","evidence":"Co-immunoprecipitation, mutagenesis of tryptophan motifs, ChIP, and transcriptional reporter assays","pmids":["16354684"],"confidence":"High","gaps":["Genome-wide target genes of PTF1-L versus PTF1-J were not distinguished","In vivo consequence of RBPJL loss on acinar cell differentiation was untested"]},{"year":2010,"claim":"Conditional Rbpjl knockout demonstrated that the PTF1-J-to-PTF1-L switch is required for terminal acinar maturation, with ~90% of downregulated genes being direct PTF1-L targets encoding digestive enzymes and secretory machinery — answering the in vivo functional requirement.","evidence":"Conditional Rbpjl knockout mouse, mRNA profiling, and ChIP for direct target identification","pmids":["20398665"],"confidence":"High","gaps":["Whether residual PTF1-J compensation masks additional PTF1-L functions was not resolved","Structural basis for PTF1-L versus PTF1-J target selectivity is unknown"]},{"year":2018,"claim":"A population-specific p.Thr280Met variant was shown to reduce RBPJL protein stability and impair transactivation of exocrine gene promoters, linking natural human genetic variation in RBPJL to quantitative differences in acinar gene expression.","evidence":"Luciferase reporter assays, overexpression and siRNA knockdown in mouse acinar cells, protein versus mRNA level comparison of variant alleles","pmids":["29302047"],"confidence":"Medium","gaps":["No clinical phenotype was definitively associated with this variant","Structural mechanism of reduced protein stability for Met280 is unknown","Effect on PTF1-L complex assembly was not directly tested"]},{"year":2022,"claim":"Discovery that RBPJL directly binds and represses the Arid5a promoter to suppress IL-6/STAT3 signaling revealed a previously unknown anti-inflammatory role in pancreatic acinar cells, extending RBPJL function beyond digestive enzyme activation.","evidence":"ChIP, EMSA, dual-luciferase reporter, overexpression/knockdown in acinar cells, cerulein-induced acute pancreatitis mouse model","pmids":["35725649"],"confidence":"Medium","gaps":["Whether Arid5a repression occurs through the PTF1-L complex or RBPJL acting independently is unclear","Genome-wide scope of RBPJL-mediated transcriptional repression has not been mapped","Single-lab finding awaiting independent replication"]},{"year":2025,"claim":"The finding that FAM102A physically interacts with RBPJL and promotes its nuclear translocation together with RUNX2 to activate SP7/Osterix and drive osteoblast differentiation established RBPJL as a regulator of bone formation outside the pancreas.","evidence":"Co-immunoprecipitation, nuclear translocation assays, conditional Fam102a knockout and Rbpjl functional mutation mice, bone histomorphometry","pmids":["39747056"],"confidence":"Medium","gaps":["Whether RBPJL forms a complex analogous to PTF1 in osteoblasts is unknown","Direct DNA targets of RBPJL in bone cells have not been identified by ChIP","Single-lab finding; independent confirmation needed"]},{"year":null,"claim":"The neuronal function of RBPJL — expressed in hippocampal pyramidal neurons, dentate gyrus, and cortical layer VI — remains entirely uncharacterized at the mechanistic level, with no target genes, binding partners, or loss-of-function phenotypes identified in the nervous system.","evidence":"","pmids":[],"confidence":"Low","gaps":["No neuronal target genes or transcriptional programs have been defined","Whether RBPJL participates in a PTF1-like complex in neurons is unknown","Behavioral or neurological consequences of neuronal RBPJL loss are untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,2,5,6,7]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,7]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,2,5,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,7]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,6]}],"complexes":["PTF1-L (PTF1 complex with RBPJL)"],"partners":["PTF1A","FAM102A","RUNX2"],"other_free_text":[]},"mechanistic_narrative":"RBPJL is a sequence-specific DNA-binding transcription factor that serves as the Notch-independent counterpart of RBP-J (CSL/RBPJ), recognizing a nearly identical DNA motif yet unable to interact with Notch intracellular domains [PMID:9111338]. In mature pancreatic acinar cells, RBPJL replaces RBP-J as the third subunit of the trimeric PTF1 complex (forming PTF1-L with PTF1a/p48 via conserved tryptophan motifs), driving terminal acinar differentiation by directly activating digestive enzyme genes, secretory apparatus components, and mitochondrial metabolism genes [PMID:16354684, PMID:20398665]. RBPJL also represses Arid5a transcription to suppress IL-6/STAT3 inflammatory signaling in acinar cells and, outside the pancreas, cooperates with FAM102A and RUNX2 to promote osteoblast differentiation through nuclear translocation and SP7/Osterix activation [PMID:35725649, PMID:39747056]. Cell-type-specific expression is governed by distinct promoters that direct RBPJL transcription in pancreas, lung, and specific neuronal populations including hippocampal pyramidal cells and cortical layer VI neurons [PMID:10502683, PMID:11549321]."},"prefetch_data":{"uniprot":{"accession":"Q9UBG7","full_name":"Recombining binding protein suppressor of hairless-like protein","aliases":["Transcription factor RBP-L"],"length_aa":517,"mass_kda":56.8,"function":"Putative transcription factor, which cooperates with EBNA2 to activate transcription","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9UBG7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RBPJL","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RBPJL","total_profiled":1310},"omim":[{"mim_id":"616104","title":"RBPJ-LIKE PROTEIN; RBPJL","url":"https://www.omim.org/entry/616104"},{"mim_id":"607194","title":"PANCREAS TRANSCRIPTION FACTOR 1, ALPHA SUBUNIT; PTF1A","url":"https://www.omim.org/entry/607194"},{"mim_id":"260350","title":"PANCREATIC CANCER","url":"https://www.omim.org/entry/260350"},{"mim_id":"147183","title":"RECOMBINATION SIGNAL-BINDING PROTEIN FOR IMMUNOGLOBULIN KAPPA J REGION; RBPJ","url":"https://www.omim.org/entry/147183"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"pancreas","ntpm":919.9}],"url":"https://www.proteinatlas.org/search/RBPJL"},"hgnc":{"alias_symbol":["RBP-L","SUH","SUHL"],"prev_symbol":["RBPSUHL"]},"alphafold":{"accession":"Q9UBG7","domains":[{"cath_id":"2.60.40.1450","chopping":"67-102_119-193","consensus_level":"high","plddt":89.8285,"start":67,"end":193},{"cath_id":"2.80.10.50","chopping":"214-365","consensus_level":"high","plddt":88.8312,"start":214,"end":365},{"cath_id":"2.60.40.10","chopping":"380-478_507-516","consensus_level":"high","plddt":85.8494,"start":380,"end":516}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBG7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBG7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UBG7-F1-predicted_aligned_error_v6.png","plddt_mean":80.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RBPJL","jax_strain_url":"https://www.jax.org/strain/search?query=RBPJL"},"sequence":{"accession":"Q9UBG7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UBG7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UBG7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UBG7"}},"corpus_meta":[{"pmid":"8625826","id":"PMC_8625826","title":"lag-1, a gene required for lin-12 and glp-1 signaling in Caenorhabditis elegans, is homologous to human CBF1 and Drosophila Su(H).","date":"1996","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/8625826","citation_count":193,"is_preprint":false},{"pmid":"16354684","id":"PMC_16354684","title":"PTF1 is an organ-specific and Notch-independent basic helix-loop-helix complex containing the mammalian Suppressor of Hairless (RBP-J) or its paralogue, RBP-L.","date":"2006","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/16354684","citation_count":169,"is_preprint":false},{"pmid":"8787746","id":"PMC_8787746","title":"Functional relationships between Notch, Su(H) and the bHLH genes of the E(spl) complex: the E(spl) genes mediate only a subset of Notch activities during imaginal development.","date":"1996","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/8787746","citation_count":163,"is_preprint":false},{"pmid":"9111338","id":"PMC_9111338","title":"RBP-L, a transcription factor related to RBP-Jkappa.","date":"1997","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/9111338","citation_count":115,"is_preprint":false},{"pmid":"9655811","id":"PMC_9655811","title":"A subset of notch functions during Drosophila eye development require Su(H) and the E(spl) gene complex.","date":"1998","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/9655811","citation_count":110,"is_preprint":false},{"pmid":"20398665","id":"PMC_20398665","title":"Replacement of Rbpj with Rbpjl in the PTF1 complex controls the final maturation of pancreatic acinar cells.","date":"2010","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/20398665","citation_count":79,"is_preprint":false},{"pmid":"15919944","id":"PMC_15919944","title":"Complementation of human papillomavirus type 16 E6 and E7 by Jagged1-specific Notch1-phosphatidylinositol 3-kinase signaling involves pleiotropic oncogenic functions independent of CBF1;Su(H);Lag-1 activation.","date":"2005","source":"Journal of virology","url":"https://pubmed.ncbi.nlm.nih.gov/15919944","citation_count":55,"is_preprint":false},{"pmid":"22915591","id":"PMC_22915591","title":"Characterization of CSL (CBF-1, Su(H), Lag-1) mutants reveals differences in signaling mediated by Notch1 and Notch2.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22915591","citation_count":39,"is_preprint":false},{"pmid":"28475577","id":"PMC_28475577","title":"Hairless-binding deficient Suppressor of Hairless alleles reveal Su(H) protein levels are dependent on complex formation with Hairless.","date":"2017","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28475577","citation_count":24,"is_preprint":false},{"pmid":"30659066","id":"PMC_30659066","title":"Targeted Endoplasmic Reticulum Localization of Storage Protein mRNAs Requires the RNA-Binding Protein RBP-L.","date":"2019","source":"Plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/30659066","citation_count":23,"is_preprint":false},{"pmid":"24282610","id":"PMC_24282610","title":"Gain of function notch phenotypes associated with ectopic expression of the Su(H) C-terminal domain illustrate separability of Notch and hairless-mediated activities.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24282610","citation_count":16,"is_preprint":false},{"pmid":"11549321","id":"PMC_11549321","title":"Characterization of the mouse matrilin-4 gene: a 5' antiparallel overlap with the gene encoding the transcription factor RBP-l.","date":"2001","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/11549321","citation_count":13,"is_preprint":false},{"pmid":"35951645","id":"PMC_35951645","title":"A Drosophila Su(H) model of Adams-Oliver Syndrome reveals cofactor titration as a mechanism underlying developmental defects.","date":"2022","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35951645","citation_count":11,"is_preprint":false},{"pmid":"29302047","id":"PMC_29302047","title":"Functional and association analysis of an Amerindian-derived population-specific p.(Thr280Met) variant in RBPJL, a component of the PTF1 complex.","date":"2018","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/29302047","citation_count":8,"is_preprint":false},{"pmid":"35725649","id":"PMC_35725649","title":"Blockade of the Arid5a/IL-6/STAT3 axis underlies the anti-inflammatory effect of Rbpjl in acute pancreatitis.","date":"2022","source":"Cell & 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evolution","url":"https://pubmed.ncbi.nlm.nih.gov/16096801","citation_count":7,"is_preprint":false},{"pmid":"33594776","id":"PMC_33594776","title":"HP1c regulates development and gut homeostasis by suppressing Notch signaling through Su(H).","date":"2021","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/33594776","citation_count":6,"is_preprint":false},{"pmid":"33775255","id":"PMC_33775255","title":"Nucleo-cytoplasmic shuttling of murine RBPJ by Hairless protein matches that of Su(H) protein in the model system Drosophila melanogaster.","date":"2021","source":"Hereditas","url":"https://pubmed.ncbi.nlm.nih.gov/33775255","citation_count":4,"is_preprint":false},{"pmid":"29164452","id":"PMC_29164452","title":"Identification of suh gene and evidence for involvement of notch signaling pathway on gonadal differentiation of Yellow River carp (Cyprinus carpio).","date":"2017","source":"Fish physiology and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/29164452","citation_count":3,"is_preprint":false},{"pmid":"37871020","id":"PMC_37871020","title":"A novel proneural function of Asense is integrated with the sequential actions of Delta-Notch, L'sc and Su(H) to promote the neuroepithelial to neuroblast transition.","date":"2023","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37871020","citation_count":1,"is_preprint":false},{"pmid":"32994998","id":"PMC_32994998","title":"p.P476S mutation of RBPJL inhibits the efficacy of anti-PD-1 therapy in oesophageal squamous cell carcinoma by blunting T-cell responses.","date":"2020","source":"Clinical & translational immunology","url":"https://pubmed.ncbi.nlm.nih.gov/32994998","citation_count":1,"is_preprint":false},{"pmid":"39513866","id":"PMC_39513866","title":"Su(H) Modulates Enhancer Transcriptional Bursting in Prelude to Gastrulation.","date":"2024","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/39513866","citation_count":1,"is_preprint":false},{"pmid":"19832680","id":"PMC_19832680","title":"Suppressor of Hairless (Su(H)) is required for foregut development in the sea urchin embryo.","date":"2009","source":"Zoological science","url":"https://pubmed.ncbi.nlm.nih.gov/19832680","citation_count":1,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.06.24.24309088","title":"Deciphering Distinct Genetic Risk Factors for FTLD-TDP Pathological Subtypes via Whole-Genome 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GST pulldown)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (DNA binding, multiple protein interaction assays) in a single study; foundational characterization paper with 115 citations\",\n      \"pmids\": [\"9111338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RBPJL functions as the third subunit of the trimeric PTF1 transcription complex in mature pancreatic acinar cells. P48/PTF1a interacts with RBPJL through two conserved tryptophan-containing motifs. Unlike RBP-J, RBPJL does not bind the Notch intracellular domain, making PTF1-L activity Notch-independent.\",\n      \"method\": \"Co-immunoprecipitation, pulldown assays, mutagenesis of tryptophan motifs, transcriptional reporter assays, chromatin immunoprecipitation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (Co-IP, mutagenesis, ChIP, reporter assays), replicated by subsequent studies, 169 citations\",\n      \"pmids\": [\"16354684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Replacement of RBPJ by RBPJL in the PTF1 complex (forming PTF1-L) drives the final maturation of pancreatic acinar cells, maximizing expression of digestive enzyme genes, secretory apparatus components, and mitochondrial metabolism genes. Loss of Rbpjl causes PTF1-J to persist and substitute for PTF1-L, reducing expression of ~50 genes (90% direct PTF1-L targets) including those encoding digestive enzymes.\",\n      \"method\": \"Conditional Rbpjl knockout mouse model; comprehensive mRNA profiling; chromatin immunoprecipitation (ChIP) to identify PTF1-L binding at regulatory sites\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, ChIP for direct target identification, corroborates biochemical findings from PTF1 complex studies\",\n      \"pmids\": [\"20398665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RBP-L (RBPJL) is expressed in a cell-type-specific manner: the upstream promoter drives expression in neurons (layer VI cortex, hippocampal pyramidal cells, dentate gyrus granule cells), while a downstream promoter is active in lung. Neuronal upstream promoter activity is regulated by neuronal activity.\",\n      \"method\": \"Targeted gene disruption with in-frame nlacZ reporter replacement; beta-galactosidase histochemistry; quantitative RT-PCR\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct knockin reporter experiment establishing cell-type-specific promoter usage; single study\",\n      \"pmids\": [\"10502683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The Rbpjl gene overlaps antisense with the Matn4 (matrilin-4) gene at the mouse chromosome 2 locus; RBPJL is expressed most highly in lung and brain, with a major transcript initiated ~150 nt upstream of the first intron splice acceptor, producing a truncated variant lacking the N-terminal 121 amino acids.\",\n      \"method\": \"Genomic cloning, RT-PCR, quantitative RT-PCR, in situ hybridization, transcription start site mapping\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct genomic and expression characterization; single study establishing locus organization and expression\",\n      \"pmids\": [\"11549321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A population-specific p.(Thr280Met) variant in RBPJL reduces protein stability (not mRNA levels) and impairs transactivation of RBPJL-responsive promoters (including CTRB1 promoter). Knockdown of Rbpjl in mouse pancreatic acinar cells reduces expression of exocrine enzyme genes including Ctrb.\",\n      \"method\": \"Luciferase transactivation assays in HEK293 cells; overexpression in mouse pancreatic acinar cells; siRNA knockdown; comparison of protein vs. mRNA levels of Met280 vs. Thr280 alleles\",\n      \"journal\": \"European journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays (reporter, overexpression, knockdown) in a single study; moderate evidence for mechanism\",\n      \"pmids\": [\"29302047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RBPJL binds to the promoter region of Arid5a and represses its transcription, thereby suppressing the IL-6/STAT3 signaling axis in pancreatic acinar cells. This anti-inflammatory mechanism attenuates acute pancreatitis.\",\n      \"method\": \"ChIP assay, EMSA, dual-luciferase reporter assay, overexpression and knockdown in pancreatic acinar cells, in vivo cerulein-induced acute pancreatitis mouse model\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, EMSA, luciferase) establishing direct promoter binding; single lab study\",\n      \"pmids\": [\"35725649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FAM102A interacts with RBPJL and promotes its nuclear translocation together with RUNX2, enhancing expression of Osterix (SP7) and thereby driving osteoblast differentiation. Deletion of Fam102a or a functional mutation in Rbpjl leads to osteopenia with reduced osteoblastic bone formation.\",\n      \"method\": \"Co-immunoprecipitation (Fam102a-Rbpjl interaction), nuclear translocation assays, conditional knockout mice (Fam102a deletion and Rbpjl functional mutation), bone histomorphometry\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus KO mouse phenotype with defined cellular readout; single study\",\n      \"pmids\": [\"39747056\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RBPJL is a sequence-specific DNA-binding transcription factor that functions as the third subunit of the trimeric PTF1 complex in mature pancreatic acinar cells (PTF1-L), where it drives final acinar differentiation by directly activating digestive enzyme and secretory genes in a Notch-independent manner; it also represses Arid5a transcription to suppress IL-6/STAT3 signaling, participates in osteoblast differentiation via FAM102A-mediated nuclear translocation, and shows cell-type-specific expression controlled by distinct promoters in lung and neurons.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RBPJL is a sequence-specific DNA-binding transcription factor that serves as the Notch-independent counterpart of RBP-J (CSL/RBPJ), recognizing a nearly identical DNA motif yet unable to interact with Notch intracellular domains [PMID:9111338]. In mature pancreatic acinar cells, RBPJL replaces RBP-J as the third subunit of the trimeric PTF1 complex (forming PTF1-L with PTF1a/p48 via conserved tryptophan motifs), driving terminal acinar differentiation by directly activating digestive enzyme genes, secretory apparatus components, and mitochondrial metabolism genes [PMID:16354684, PMID:20398665]. RBPJL also represses Arid5a transcription to suppress IL-6/STAT3 inflammatory signaling in acinar cells and, outside the pancreas, cooperates with FAM102A and RUNX2 to promote osteoblast differentiation through nuclear translocation and SP7/Osterix activation [PMID:35725649, PMID:39747056]. Cell-type-specific expression is governed by distinct promoters that direct RBPJL transcription in pancreas, lung, and specific neuronal populations including hippocampal pyramidal cells and cortical layer VI neurons [PMID:10502683, PMID:11549321].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"The discovery that RBP-L binds the same DNA motif as RBP-J yet cannot interact with any Notch intracellular domain established RBPJL as a Notch-independent paralogue, raising the question of what transcriptional programs it controls independently of Notch signaling.\",\n      \"evidence\": \"DNA-binding assays, co-immunoprecipitation, and GST pulldown in mammalian cells\",\n      \"pmids\": [\"9111338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No endogenous target genes or tissue-specific functions identified\",\n        \"Physiological protein partners beyond Notch remained unknown\",\n        \"Whether RBPJL participates in a larger transcription complex was untested\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Knockin reporter experiments revealed that RBPJL expression is controlled by two distinct promoters — an upstream neuronal promoter active in cortical and hippocampal neurons and a downstream promoter active in lung — establishing cell-type specificity and raising the question of distinct functions across tissues.\",\n      \"evidence\": \"Targeted nlacZ knockin replacement, β-galactosidase histochemistry, and quantitative RT-PCR in mouse brain and lung\",\n      \"pmids\": [\"10502683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Pancreatic expression and its regulatory elements were not characterized in this study\",\n        \"Functional consequence of RBPJL loss in neurons was not assessed\",\n        \"Neuronal target genes remain unidentified\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Genomic characterization showed the Rbpjl locus overlaps antisense with Matn4 and produces a truncated transcript variant lacking 121 N-terminal amino acids, clarifying locus architecture but leaving variant-specific function unresolved.\",\n      \"evidence\": \"Genomic cloning, RT-PCR, in situ hybridization, and transcription start site mapping in mouse tissues\",\n      \"pmids\": [\"11549321\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional significance of the truncated N-terminal variant is unknown\",\n        \"Whether antisense overlap with Matn4 has regulatory consequences was not tested\"\n      ]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of RBPJL as the third subunit of the PTF1-L trimeric complex — recruited by PTF1a/p48 through two tryptophan motifs — established the molecular basis for Notch-independent transcriptional control in pancreatic acinar cells.\",\n      \"evidence\": \"Co-immunoprecipitation, mutagenesis of tryptophan motifs, ChIP, and transcriptional reporter assays\",\n      \"pmids\": [\"16354684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Genome-wide target genes of PTF1-L versus PTF1-J were not distinguished\",\n        \"In vivo consequence of RBPJL loss on acinar cell differentiation was untested\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Conditional Rbpjl knockout demonstrated that the PTF1-J-to-PTF1-L switch is required for terminal acinar maturation, with ~90% of downregulated genes being direct PTF1-L targets encoding digestive enzymes and secretory machinery — answering the in vivo functional requirement.\",\n      \"evidence\": \"Conditional Rbpjl knockout mouse, mRNA profiling, and ChIP for direct target identification\",\n      \"pmids\": [\"20398665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether residual PTF1-J compensation masks additional PTF1-L functions was not resolved\",\n        \"Structural basis for PTF1-L versus PTF1-J target selectivity is unknown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A population-specific p.Thr280Met variant was shown to reduce RBPJL protein stability and impair transactivation of exocrine gene promoters, linking natural human genetic variation in RBPJL to quantitative differences in acinar gene expression.\",\n      \"evidence\": \"Luciferase reporter assays, overexpression and siRNA knockdown in mouse acinar cells, protein versus mRNA level comparison of variant alleles\",\n      \"pmids\": [\"29302047\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No clinical phenotype was definitively associated with this variant\",\n        \"Structural mechanism of reduced protein stability for Met280 is unknown\",\n        \"Effect on PTF1-L complex assembly was not directly tested\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery that RBPJL directly binds and represses the Arid5a promoter to suppress IL-6/STAT3 signaling revealed a previously unknown anti-inflammatory role in pancreatic acinar cells, extending RBPJL function beyond digestive enzyme activation.\",\n      \"evidence\": \"ChIP, EMSA, dual-luciferase reporter, overexpression/knockdown in acinar cells, cerulein-induced acute pancreatitis mouse model\",\n      \"pmids\": [\"35725649\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether Arid5a repression occurs through the PTF1-L complex or RBPJL acting independently is unclear\",\n        \"Genome-wide scope of RBPJL-mediated transcriptional repression has not been mapped\",\n        \"Single-lab finding awaiting independent replication\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The finding that FAM102A physically interacts with RBPJL and promotes its nuclear translocation together with RUNX2 to activate SP7/Osterix and drive osteoblast differentiation established RBPJL as a regulator of bone formation outside the pancreas.\",\n      \"evidence\": \"Co-immunoprecipitation, nuclear translocation assays, conditional Fam102a knockout and Rbpjl functional mutation mice, bone histomorphometry\",\n      \"pmids\": [\"39747056\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether RBPJL forms a complex analogous to PTF1 in osteoblasts is unknown\",\n        \"Direct DNA targets of RBPJL in bone cells have not been identified by ChIP\",\n        \"Single-lab finding; independent confirmation needed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The neuronal function of RBPJL — expressed in hippocampal pyramidal neurons, dentate gyrus, and cortical layer VI — remains entirely uncharacterized at the mechanistic level, with no target genes, binding partners, or loss-of-function phenotypes identified in the nervous system.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No neuronal target genes or transcriptional programs have been defined\",\n        \"Whether RBPJL participates in a PTF1-like complex in neurons is unknown\",\n        \"Behavioral or neurological consequences of neuronal RBPJL loss are untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 5, 6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 5, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"complexes\": [\n      \"PTF1-L (PTF1 complex with RBPJL)\"\n    ],\n    \"partners\": [\n      \"PTF1A\",\n      \"FAM102A\",\n      \"RUNX2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}