{"gene":"LIN37","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2007,"finding":"LIN-37 (mammalian homolog Mip40/LIN37) is a core subunit of the DREAM complex (DP, RB-like, E2F, and MuvB), which contains p130, E2F4, DP1, and five MuvB-like proteins (LIN9, LIN37, LIN52, LIN54, RBBP4). DREAM binds to more than 800 human promoters in G0 and is required for repression of E2F target genes. In S phase, MuvB proteins (including LIN37) dissociate from p130 and form a distinct submodule that binds MYB.","method":"Proteomics (mass spectrometry), genomics, co-immunoprecipitation, ChIP","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, proteomics, and ChIP in a single study; subsequently replicated by multiple independent labs","pmids":["17531812"],"is_preprint":false},{"year":2006,"finding":"C. elegans LIN-37 is a component of a multi-subunit complex containing LIN-35 (Rb homolog) and at least seven synMuvB proteins. Biochemical analyses of mutants showed that LIN-9, LIN-53, and LIN-54 are required for stable formation of this complex. This LIN-35-containing complex is distinct from a second NuRD-like synMuvB complex.","method":"Co-immunoprecipitation, biochemical fractionation of C. elegans mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with mutant epistasis, multiple orthogonal methods, replicated in subsequent studies","pmids":["17075059"],"is_preprint":false},{"year":1995,"finding":"C. elegans LIN-37 acts cell non-autonomously and plays a role, together with LIN-15, in the generation of an intercellular signal by hyp7 that represses vulval development, as demonstrated by mosaic analysis.","method":"Genetic mosaic analysis using ncl-1 cell-autonomous marker","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — classic mosaic analysis single lab establishing non-cell-autonomous function; limited molecular mechanism","pmids":["8582642"],"is_preprint":false},{"year":2011,"finding":"LIN37 is a stable core component of the MuvB complex in DREAM. The MuvB core (including LIN37) dissociates from p130 upon cell cycle entry and associates with BMYB during S phase. DYRK1A-mediated phosphorylation of LIN52 at serine 28 is required for DREAM assembly, and thus indirectly for LIN37 incorporation into DREAM.","method":"Mass spectrometry phosphoproteomic analysis, co-immunoprecipitation, point mutagenesis of LIN52-S28, kinase inhibition","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mass spectrometry, co-IP, mutagenesis, and kinase inhibition in a single rigorous study","pmids":["21498570"],"is_preprint":false},{"year":2009,"finding":"Mip40/LIN-37 is part of the Mip Core Complex (MCC/LINC) with Mip130/LIN-9, Mip120/LIN-54, and Sin3b, which is detectable in all phases of the cell cycle. This core complex recruits p107, p130, E2F4, and HDAC1 in G0/G1 and B-Myb in S-phase. CDK4-mediated phosphorylation of pocket proteins (p107/p130) mediates the switch from repressor to activator complexes.","method":"Co-immunoprecipitation, deletion mutant analysis, CDK4-/- MEF rescue","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with deletion mutants and genetic rescue, single lab, two complementary approaches","pmids":["19619530"],"is_preprint":false},{"year":2017,"finding":"LIN37 is an essential functional component of the mammalian DREAM complex. Mouse cells lacking Lin37 proliferate normally, but DREAM completely loses its ability to repress target genes in G0/G1 even though all other subunits (including p130/p107) still bind to target gene promoters. Cells lacking both Rb and Lin37 are incapable of exiting the cell cycle, demonstrating that Lin37 cooperates with Rb to induce quiescence.","method":"Lin37 knockout mouse cells, ChIP, gene expression analysis, cell cycle analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined molecular phenotype (ChIP + transcriptomics), double-knockout epistasis, replicated by subsequent studies","pmids":["28920576"],"is_preprint":false},{"year":2004,"finding":"C. elegans LIN-37 genetically cooperates with LIN-35/Rb and LIN-9 (class B synMuv proteins) together with the SWI/SNF component PSA-1/SWI3 to regulate asymmetric T cell division and larval development. Loss-of-function mutations in lin-37 strongly enhanced defects in asymmetric T cell division caused by psa-1 mutation.","method":"Genetic epistasis (double mutant analysis), C. elegans developmental phenotype","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with defined cellular phenotype, single lab","pmids":["15280233"],"is_preprint":false},{"year":2007,"finding":"C. elegans LIN-37 (Mip40 homolog) participates in transcriptional regulation of programmed cell death, acting together with DPL-1/DP, EFL-1/E2F, LIN-35/Rb, and LIN-52 to promote programmed cell death in C. elegans.","method":"Genetic epistasis, sensitized mutant screen (ced-3 partial loss-of-function background)","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in sensitized background, single lab, multiple gene interactions tested","pmids":["17237514"],"is_preprint":false},{"year":2019,"finding":"Knockout of LIN37/DREAM results in reduced repression of cell-cycle genes after p53 activation. In LIN37-/-;RB-/- double-knockout cells, p53-dependent repression of cell-cycle genes is completely abrogated, leading to loss of the G1/S checkpoint. LIN37 and RB together are key effectors of the p53 signaling pathway for downregulating cell-cycle genes.","method":"CRISPR/Cas9 knockout of LIN37 and RB, RNA-seq, cell cycle analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean CRISPR knockouts (single and double), RNA-seq, and cell cycle phenotype; double-KO epistasis; complemented by independent work (PMID:28920576)","pmids":["31400114"],"is_preprint":false},{"year":2018,"finding":"B-Myb overexpression disrupts the DREAM complex in human cells through its MuvB-binding domain, competing with p130 for MuvB core (including LIN37) binding. High B-Myb expression correlates with global loss of repression of DREAM target genes.","method":"Co-immunoprecipitation, B-Myb MuvB-binding domain mutant analysis, gene expression profiling","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mutants, single lab, two orthogonal approaches","pmids":["30206359"],"is_preprint":false},{"year":2014,"finding":"LIN37 is a component of the mammalian DREAM complex required for cell cycle exit in chondrocytes during endochondral bone formation. Mice with targeted disruption of MuvB binding to p107/p130 (lacking functional DREAM) show defects in chondrocyte proliferation arrest and die shortly after birth. DYRK kinase inhibition phenocopies DREAM loss in embryonic bone cultures.","method":"Gene-targeted mouse model (p107 MuvB-binding domain disruption + p130 knockout), histology, micro-CT, pharmacologic DYRK inhibition in embryonic bone cultures","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse genetic model with defined cellular phenotype, pharmacologic validation, multiple orthogonal methods","pmids":["24710275"],"is_preprint":false},{"year":2021,"finding":"LIN37, as a component of the DREAM transcriptional repressor complex, prevents DNA end resection and homologous recombination (HR) in quiescent (G0) cells by repressing expression of HR proteins including BRCA1, BRCA2, PALB2, and RAD51. This function is independent of 53BP1. Loss of LIN37 in G0 cells leads to BRCA1-dependent DNA end resection, RAD51 filament formation, and HR. LIN37 is not required for DNA end protection in cycling cells at G1 phase.","method":"LIN37 knockout cells, DNA end resection assays, HR assays, epistasis with 53BP1 and BRCA1 knockdown, RAD51 foci analysis, gene expression analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with multiple orthogonal functional assays (resection, HR, RAD51 foci, expression), epistasis with 53BP1 and BRCA1","pmids":["34477552"],"is_preprint":false},{"year":2022,"finding":"LIN37 functions as a scaffolding protein within the MuvB complex, arranging LIN9, LIN52, LIN54, and RBAP48 for transcription factor, DNA, and histone binding. Crystal structure of a LIN9-LIN37 subcomplex reveals that these two subunits form the structural scaffold of MuvB. MuvB binds nucleosomes through an interface distinct from the LIN54-DNA consensus site and increases nucleosome occupancy in reconstituted promoters; in arrested cells MuvB associates with a tightly positioned +1 nucleosome near the TSS.","method":"Crystal structure determination, in vitro nucleosome binding assays, promoter reconstitution, ChIP-seq in arrested cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure, in vitro biochemical reconstitution, and ChIP-seq in a single rigorous study with multiple orthogonal methods","pmids":["35082292"],"is_preprint":false},{"year":2019,"finding":"In C. elegans synMuvB mutants (including lin-37), germline and synMuvB target genes show dramatic reduction of H3K9me2 at their promoters. However, the reduction of H3K9me2 in lin-37 mutants is much weaker than in lin-15B mutants, suggesting that LIN-37/DREAM and LIN-15B use distinct molecular mechanisms for gene repression, with H3K9me2 being primarily driven by LIN-15B rather than LIN-37.","method":"ChIP-seq for H3K9me2 in C. elegans synMuvB mutants","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq in multiple mutant backgrounds, single lab, reveals mechanistic distinction","pmids":["30910798"],"is_preprint":false},{"year":2021,"finding":"Simultaneous expression of MMB-FOXM1 components bypasses senescence; non-phosphorylated LIN52 (which disrupts DREAM complex assembly, releasing LIN37 and other MuvB components) is a crucial component for this bypass, indicating that DREAM complex assembly (including LIN37 as a core component) is central to maintaining senescence.","method":"Stable senescence bypass assay in conditional immortalized human breast fibroblasts, DREAM assembly disruption via LIN52 phospho-mutants","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional senescence bypass assay with mechanistic LIN52 mutagenesis, single lab","pmids":["34728711"],"is_preprint":false},{"year":2022,"finding":"In mouse embryonic stem cells, deficiency of Lin37 does not trigger G2/M arrest or loss of pluripotency (in contrast to deficiency of Lin54 or Lin52 which do cause these phenotypes), indicating that Lin37 is dispensable for the MuvB complex functions controlling ESC self-renewal and G2/M progression.","method":"CRISPR/Cas9 knockout of individual MuvB components in ESCs, cell cycle analysis, pluripotency marker analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean CRISPR knockouts with defined phenotypic readouts; this is a negative finding for Lin37 specifically","pmids":["35148988"],"is_preprint":false},{"year":2024,"finding":"C. elegans LIN-37, as a component of the DREAM complex (together with LIN-35 and LIN-54), is required for temperature stress-induced increases in germline apoptosis and for DNA damage-induced apoptosis. LIN-37 mutants fail to upregulate germline apoptosis under moderate temperature stress, and this pathway depends on repression of CED-9/Bcl2 function.","method":"C. elegans lin-37 mutant analysis, germline apoptosis quantification under temperature stress and DNA damage conditions, genetic epistasis with ced-9","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean loss-of-function with defined apoptotic phenotype and epistasis, but preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.11.13.623436"],"is_preprint":true}],"current_model":"LIN37 is an essential scaffolding subunit of the evolutionarily conserved MuvB core complex (with LIN9, LIN52, LIN54, and RBBP4), which assembles into the DREAM transcriptional repressor (together with p130, E2F4, and DP1) during quiescence to repress hundreds of cell-cycle-dependent genes by stabilizing nucleosomes at the +1 position downstream of the TSS; LIN37 is uniquely required for DREAM-mediated gene repression (its loss abolishes repression while leaving all other subunits at promoters), cooperates with RB to enforce the G1/S checkpoint downstream of p53, and—in quiescent cells specifically—prevents DNA end resection and homologous recombination by repressing HR gene expression in a 53BP1-independent manner."},"narrative":{"mechanistic_narrative":"LIN37 is an essential subunit of the evolutionarily conserved MuvB core complex (with LIN9, LIN52, LIN54, and RBBP4/RBAP48), which assembles with the pocket protein p130, E2F4, and DP1 into the DREAM transcriptional repressor that silences hundreds of cell-cycle-dependent genes during quiescence [PMID:17531812, PMID:28920576]. Within MuvB, LIN37 functions as a structural scaffold: it forms a subcomplex with LIN9 that organizes the core for transcription factor, DNA, and histone binding, enabling MuvB to engage and stabilize a tightly positioned +1 nucleosome near the TSS of repressed promoters [PMID:35082292]. LIN37 is uniquely required for the repressive output of DREAM—its loss abolishes target-gene repression in G0/G1 even though all other subunits, including p130/p107, remain bound at promoters [PMID:28920576]. DREAM assembly depends on DYRK1A-mediated phosphorylation of LIN52 at serine 28, and on cell-cycle entry the MuvB core (including LIN37) dissociates from p130 and instead associates with B-MYB during S phase, a switch that B-MYB overexpression can force prematurely by competing with p130 for the core [PMID:21498570, PMID:30206359]. Functionally, LIN37 cooperates with RB to enforce cell-cycle exit and acts as a key effector downstream of p53: in LIN37/RB double-knockout cells, p53-dependent repression of cell-cycle genes and the G1/S checkpoint are lost [PMID:28920576, PMID:31400114]. In quiescent cells specifically, LIN37 prevents DNA end resection and homologous recombination by repressing HR genes including BRCA1, BRCA2, PALB2, and RAD51, a function independent of 53BP1 [PMID:34477552]. The complex also governs developmental cell-cycle exit, as DREAM loss disrupts chondrocyte proliferation arrest during endochondral bone formation [PMID:24710275], and maintenance of senescence depends on intact DREAM assembly [PMID:34728711]. Notably, LIN37 is dispensable for MuvB functions controlling embryonic stem cell self-renewal and G2/M progression, distinguishing its role from that of LIN54 and LIN52 [PMID:35148988].","teleology":[{"year":2006,"claim":"Established that LIN-37 is a stable member of an Rb-containing multi-subunit synMuvB complex, defining its physical context before its molecular function was known.","evidence":"Co-IP and biochemical fractionation of C. elegans synMuvB mutants","pmids":["17075059"],"confidence":"High","gaps":["Did not assign LIN-37 a discrete molecular role within the complex","Mammalian counterpart not yet characterized"]},{"year":2007,"claim":"Defined the mammalian DREAM complex and placed LIN37 among the five MuvB-core subunits, showing the complex binds >800 promoters in G0 and that MuvB switches partners between p130 (repression) and MYB (S phase).","evidence":"Proteomics, ChIP, and co-IP in human cells","pmids":["17531812"],"confidence":"High","gaps":["LIN37-specific contribution to repression not isolated","Mechanism of nucleosome/promoter engagement unknown"]},{"year":2011,"claim":"Showed DREAM assembly—and thus LIN37 incorporation—is gated by DYRK1A phosphorylation of LIN52-S28, linking a kinase signal to repressor formation.","evidence":"Phosphoproteomics, co-IP, LIN52-S28 mutagenesis, and kinase inhibition","pmids":["21498570"],"confidence":"High","gaps":["Does not address LIN37's own regulation or modifications","Direct repressive activity of LIN37 not tested"]},{"year":2017,"claim":"Isolated LIN37 as the subunit uniquely required for DREAM repression: its loss abolishes target-gene silencing while leaving all other subunits at promoters, and it cooperates with RB to enforce quiescence.","evidence":"Lin37-knockout mouse cells with ChIP, transcriptomics, and Rb/Lin37 double-KO cell-cycle analysis","pmids":["28920576"],"confidence":"High","gaps":["Molecular mechanism by which LIN37 converts a bound complex into a repressive one not resolved","Structural basis unknown"]},{"year":2019,"claim":"Positioned LIN37 and RB as the key effectors through which p53 represses cell-cycle genes, since their joint loss abrogates p53-dependent repression and the G1/S checkpoint.","evidence":"CRISPR single/double knockouts of LIN37 and RB with RNA-seq and cell-cycle analysis","pmids":["31400114"],"confidence":"High","gaps":["Connection between p53 signaling and DREAM assembly mechanistically undefined","Direct vs indirect coupling to p53 unclear"]},{"year":2021,"claim":"Revealed a quiescence-specific genome-protective role: LIN37/DREAM represses HR genes to block DNA end resection and homologous recombination in G0, independent of 53BP1.","evidence":"LIN37-knockout cells with resection/HR assays, RAD51 foci, and epistasis with 53BP1 and BRCA1","pmids":["34477552"],"confidence":"High","gaps":["Why this role is restricted to G0 and not cycling G1 not fully explained","No structural detail on HR-gene promoter engagement"]},{"year":2022,"claim":"Provided the structural basis for LIN37 function, showing it forms a LIN9-LIN37 scaffold organizing the MuvB core and enabling nucleosome binding and stabilization of the +1 nucleosome at repressed promoters.","evidence":"Crystal structure of a LIN9-LIN37 subcomplex, in vitro nucleosome-binding and promoter reconstitution, and ChIP-seq in arrested cells","pmids":["35082292"],"confidence":"High","gaps":["How nucleosome stabilization mechanistically silences transcription not fully resolved","Structure of full MuvB or DREAM not determined"]},{"year":2022,"claim":"Distinguished LIN37 from other MuvB subunits by showing it is dispensable for ESC self-renewal and G2/M progression, unlike LIN54 and LIN52.","evidence":"CRISPR knockout of individual MuvB components in mouse ESCs with cell-cycle and pluripotency readouts","pmids":["35148988"],"confidence":"Medium","gaps":["Does not explain the molecular basis of LIN37's context-specific dispensability","Negative finding limited to ESC context"]},{"year":null,"claim":"How LIN37 mechanistically converts a promoter-bound MuvB core into an active repressive state—and whether its own regulation links DREAM to specific upstream signals—remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No defined post-translational regulation of LIN37 itself","Mechanism connecting +1 nucleosome stabilization to transcriptional silencing incomplete","No structure of LIN37 within full DREAM"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,5,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[12]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[12]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,5,8]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,5]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[11]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[12]}],"complexes":["DREAM complex","MuvB core complex"],"partners":["LIN9","LIN52","LIN54","RBBP4","P130","E2F4","B-MYB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96GY3","full_name":"Protein lin-37 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oncology","url":"https://pubmed.ncbi.nlm.nih.gov/41952686","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.11.13.623436","title":"LIN-35 and the DREAM complex promote temperature stress induced increases in germline apoptosis and cytoplasmic streaming in  <i>C. elegans</i>","date":"2024-11-15","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.13.623436","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13306,"output_tokens":4293,"usd":0.052157,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12219,"output_tokens":3160,"usd":0.070047,"stage2_stop_reason":"end_turn"},"total_usd":0.122204,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"LIN-37 (mammalian homolog Mip40/LIN37) is a core subunit of the DREAM complex (DP, RB-like, E2F, and MuvB), which contains p130, E2F4, DP1, and five MuvB-like proteins (LIN9, LIN37, LIN52, LIN54, RBBP4). DREAM binds to more than 800 human promoters in G0 and is required for repression of E2F target genes. In S phase, MuvB proteins (including LIN37) dissociate from p130 and form a distinct submodule that binds MYB.\",\n      \"method\": \"Proteomics (mass spectrometry), genomics, co-immunoprecipitation, ChIP\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, proteomics, and ChIP in a single study; subsequently replicated by multiple independent labs\",\n      \"pmids\": [\"17531812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"C. elegans LIN-37 is a component of a multi-subunit complex containing LIN-35 (Rb homolog) and at least seven synMuvB proteins. Biochemical analyses of mutants showed that LIN-9, LIN-53, and LIN-54 are required for stable formation of this complex. This LIN-35-containing complex is distinct from a second NuRD-like synMuvB complex.\",\n      \"method\": \"Co-immunoprecipitation, biochemical fractionation of C. elegans mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with mutant epistasis, multiple orthogonal methods, replicated in subsequent studies\",\n      \"pmids\": [\"17075059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"C. elegans LIN-37 acts cell non-autonomously and plays a role, together with LIN-15, in the generation of an intercellular signal by hyp7 that represses vulval development, as demonstrated by mosaic analysis.\",\n      \"method\": \"Genetic mosaic analysis using ncl-1 cell-autonomous marker\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — classic mosaic analysis single lab establishing non-cell-autonomous function; limited molecular mechanism\",\n      \"pmids\": [\"8582642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LIN37 is a stable core component of the MuvB complex in DREAM. The MuvB core (including LIN37) dissociates from p130 upon cell cycle entry and associates with BMYB during S phase. DYRK1A-mediated phosphorylation of LIN52 at serine 28 is required for DREAM assembly, and thus indirectly for LIN37 incorporation into DREAM.\",\n      \"method\": \"Mass spectrometry phosphoproteomic analysis, co-immunoprecipitation, point mutagenesis of LIN52-S28, kinase inhibition\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mass spectrometry, co-IP, mutagenesis, and kinase inhibition in a single rigorous study\",\n      \"pmids\": [\"21498570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mip40/LIN-37 is part of the Mip Core Complex (MCC/LINC) with Mip130/LIN-9, Mip120/LIN-54, and Sin3b, which is detectable in all phases of the cell cycle. This core complex recruits p107, p130, E2F4, and HDAC1 in G0/G1 and B-Myb in S-phase. CDK4-mediated phosphorylation of pocket proteins (p107/p130) mediates the switch from repressor to activator complexes.\",\n      \"method\": \"Co-immunoprecipitation, deletion mutant analysis, CDK4-/- MEF rescue\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with deletion mutants and genetic rescue, single lab, two complementary approaches\",\n      \"pmids\": [\"19619530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LIN37 is an essential functional component of the mammalian DREAM complex. Mouse cells lacking Lin37 proliferate normally, but DREAM completely loses its ability to repress target genes in G0/G1 even though all other subunits (including p130/p107) still bind to target gene promoters. Cells lacking both Rb and Lin37 are incapable of exiting the cell cycle, demonstrating that Lin37 cooperates with Rb to induce quiescence.\",\n      \"method\": \"Lin37 knockout mouse cells, ChIP, gene expression analysis, cell cycle analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined molecular phenotype (ChIP + transcriptomics), double-knockout epistasis, replicated by subsequent studies\",\n      \"pmids\": [\"28920576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"C. elegans LIN-37 genetically cooperates with LIN-35/Rb and LIN-9 (class B synMuv proteins) together with the SWI/SNF component PSA-1/SWI3 to regulate asymmetric T cell division and larval development. Loss-of-function mutations in lin-37 strongly enhanced defects in asymmetric T cell division caused by psa-1 mutation.\",\n      \"method\": \"Genetic epistasis (double mutant analysis), C. elegans developmental phenotype\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with defined cellular phenotype, single lab\",\n      \"pmids\": [\"15280233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"C. elegans LIN-37 (Mip40 homolog) participates in transcriptional regulation of programmed cell death, acting together with DPL-1/DP, EFL-1/E2F, LIN-35/Rb, and LIN-52 to promote programmed cell death in C. elegans.\",\n      \"method\": \"Genetic epistasis, sensitized mutant screen (ced-3 partial loss-of-function background)\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in sensitized background, single lab, multiple gene interactions tested\",\n      \"pmids\": [\"17237514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Knockout of LIN37/DREAM results in reduced repression of cell-cycle genes after p53 activation. In LIN37-/-;RB-/- double-knockout cells, p53-dependent repression of cell-cycle genes is completely abrogated, leading to loss of the G1/S checkpoint. LIN37 and RB together are key effectors of the p53 signaling pathway for downregulating cell-cycle genes.\",\n      \"method\": \"CRISPR/Cas9 knockout of LIN37 and RB, RNA-seq, cell cycle analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean CRISPR knockouts (single and double), RNA-seq, and cell cycle phenotype; double-KO epistasis; complemented by independent work (PMID:28920576)\",\n      \"pmids\": [\"31400114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"B-Myb overexpression disrupts the DREAM complex in human cells through its MuvB-binding domain, competing with p130 for MuvB core (including LIN37) binding. High B-Myb expression correlates with global loss of repression of DREAM target genes.\",\n      \"method\": \"Co-immunoprecipitation, B-Myb MuvB-binding domain mutant analysis, gene expression profiling\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mutants, single lab, two orthogonal approaches\",\n      \"pmids\": [\"30206359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LIN37 is a component of the mammalian DREAM complex required for cell cycle exit in chondrocytes during endochondral bone formation. Mice with targeted disruption of MuvB binding to p107/p130 (lacking functional DREAM) show defects in chondrocyte proliferation arrest and die shortly after birth. DYRK kinase inhibition phenocopies DREAM loss in embryonic bone cultures.\",\n      \"method\": \"Gene-targeted mouse model (p107 MuvB-binding domain disruption + p130 knockout), histology, micro-CT, pharmacologic DYRK inhibition in embryonic bone cultures\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse genetic model with defined cellular phenotype, pharmacologic validation, multiple orthogonal methods\",\n      \"pmids\": [\"24710275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LIN37, as a component of the DREAM transcriptional repressor complex, prevents DNA end resection and homologous recombination (HR) in quiescent (G0) cells by repressing expression of HR proteins including BRCA1, BRCA2, PALB2, and RAD51. This function is independent of 53BP1. Loss of LIN37 in G0 cells leads to BRCA1-dependent DNA end resection, RAD51 filament formation, and HR. LIN37 is not required for DNA end protection in cycling cells at G1 phase.\",\n      \"method\": \"LIN37 knockout cells, DNA end resection assays, HR assays, epistasis with 53BP1 and BRCA1 knockdown, RAD51 foci analysis, gene expression analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with multiple orthogonal functional assays (resection, HR, RAD51 foci, expression), epistasis with 53BP1 and BRCA1\",\n      \"pmids\": [\"34477552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LIN37 functions as a scaffolding protein within the MuvB complex, arranging LIN9, LIN52, LIN54, and RBAP48 for transcription factor, DNA, and histone binding. Crystal structure of a LIN9-LIN37 subcomplex reveals that these two subunits form the structural scaffold of MuvB. MuvB binds nucleosomes through an interface distinct from the LIN54-DNA consensus site and increases nucleosome occupancy in reconstituted promoters; in arrested cells MuvB associates with a tightly positioned +1 nucleosome near the TSS.\",\n      \"method\": \"Crystal structure determination, in vitro nucleosome binding assays, promoter reconstitution, ChIP-seq in arrested cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure, in vitro biochemical reconstitution, and ChIP-seq in a single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"35082292\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In C. elegans synMuvB mutants (including lin-37), germline and synMuvB target genes show dramatic reduction of H3K9me2 at their promoters. However, the reduction of H3K9me2 in lin-37 mutants is much weaker than in lin-15B mutants, suggesting that LIN-37/DREAM and LIN-15B use distinct molecular mechanisms for gene repression, with H3K9me2 being primarily driven by LIN-15B rather than LIN-37.\",\n      \"method\": \"ChIP-seq for H3K9me2 in C. elegans synMuvB mutants\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq in multiple mutant backgrounds, single lab, reveals mechanistic distinction\",\n      \"pmids\": [\"30910798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Simultaneous expression of MMB-FOXM1 components bypasses senescence; non-phosphorylated LIN52 (which disrupts DREAM complex assembly, releasing LIN37 and other MuvB components) is a crucial component for this bypass, indicating that DREAM complex assembly (including LIN37 as a core component) is central to maintaining senescence.\",\n      \"method\": \"Stable senescence bypass assay in conditional immortalized human breast fibroblasts, DREAM assembly disruption via LIN52 phospho-mutants\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional senescence bypass assay with mechanistic LIN52 mutagenesis, single lab\",\n      \"pmids\": [\"34728711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In mouse embryonic stem cells, deficiency of Lin37 does not trigger G2/M arrest or loss of pluripotency (in contrast to deficiency of Lin54 or Lin52 which do cause these phenotypes), indicating that Lin37 is dispensable for the MuvB complex functions controlling ESC self-renewal and G2/M progression.\",\n      \"method\": \"CRISPR/Cas9 knockout of individual MuvB components in ESCs, cell cycle analysis, pluripotency marker analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean CRISPR knockouts with defined phenotypic readouts; this is a negative finding for Lin37 specifically\",\n      \"pmids\": [\"35148988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"C. elegans LIN-37, as a component of the DREAM complex (together with LIN-35 and LIN-54), is required for temperature stress-induced increases in germline apoptosis and for DNA damage-induced apoptosis. LIN-37 mutants fail to upregulate germline apoptosis under moderate temperature stress, and this pathway depends on repression of CED-9/Bcl2 function.\",\n      \"method\": \"C. elegans lin-37 mutant analysis, germline apoptosis quantification under temperature stress and DNA damage conditions, genetic epistasis with ced-9\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean loss-of-function with defined apoptotic phenotype and epistasis, but preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.11.13.623436\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"LIN37 is an essential scaffolding subunit of the evolutionarily conserved MuvB core complex (with LIN9, LIN52, LIN54, and RBBP4), which assembles into the DREAM transcriptional repressor (together with p130, E2F4, and DP1) during quiescence to repress hundreds of cell-cycle-dependent genes by stabilizing nucleosomes at the +1 position downstream of the TSS; LIN37 is uniquely required for DREAM-mediated gene repression (its loss abolishes repression while leaving all other subunits at promoters), cooperates with RB to enforce the G1/S checkpoint downstream of p53, and—in quiescent cells specifically—prevents DNA end resection and homologous recombination by repressing HR gene expression in a 53BP1-independent manner.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LIN37 is an essential subunit of the evolutionarily conserved MuvB core complex (with LIN9, LIN52, LIN54, and RBBP4/RBAP48), which assembles with the pocket protein p130, E2F4, and DP1 into the DREAM transcriptional repressor that silences hundreds of cell-cycle-dependent genes during quiescence [#0, #5]. Within MuvB, LIN37 functions as a structural scaffold: it forms a subcomplex with LIN9 that organizes the core for transcription factor, DNA, and histone binding, enabling MuvB to engage and stabilize a tightly positioned +1 nucleosome near the TSS of repressed promoters [#12]. LIN37 is uniquely required for the repressive output of DREAM—its loss abolishes target-gene repression in G0/G1 even though all other subunits, including p130/p107, remain bound at promoters [#5]. DREAM assembly depends on DYRK1A-mediated phosphorylation of LIN52 at serine 28, and on cell-cycle entry the MuvB core (including LIN37) dissociates from p130 and instead associates with B-MYB during S phase, a switch that B-MYB overexpression can force prematurely by competing with p130 for the core [#3, #9]. Functionally, LIN37 cooperates with RB to enforce cell-cycle exit and acts as a key effector downstream of p53: in LIN37/RB double-knockout cells, p53-dependent repression of cell-cycle genes and the G1/S checkpoint are lost [#5, #8]. In quiescent cells specifically, LIN37 prevents DNA end resection and homologous recombination by repressing HR genes including BRCA1, BRCA2, PALB2, and RAD51, a function independent of 53BP1 [#11]. The complex also governs developmental cell-cycle exit, as DREAM loss disrupts chondrocyte proliferation arrest during endochondral bone formation [#10], and maintenance of senescence depends on intact DREAM assembly [#14]. Notably, LIN37 is dispensable for MuvB functions controlling embryonic stem cell self-renewal and G2/M progression, distinguishing its role from that of LIN54 and LIN52 [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that LIN-37 is a stable member of an Rb-containing multi-subunit synMuvB complex, defining its physical context before its molecular function was known.\",\n      \"evidence\": \"Co-IP and biochemical fractionation of C. elegans synMuvB mutants\",\n      \"pmids\": [\"17075059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not assign LIN-37 a discrete molecular role within the complex\", \"Mammalian counterpart not yet characterized\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the mammalian DREAM complex and placed LIN37 among the five MuvB-core subunits, showing the complex binds >800 promoters in G0 and that MuvB switches partners between p130 (repression) and MYB (S phase).\",\n      \"evidence\": \"Proteomics, ChIP, and co-IP in human cells\",\n      \"pmids\": [\"17531812\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"LIN37-specific contribution to repression not isolated\", \"Mechanism of nucleosome/promoter engagement unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showed DREAM assembly—and thus LIN37 incorporation—is gated by DYRK1A phosphorylation of LIN52-S28, linking a kinase signal to repressor formation.\",\n      \"evidence\": \"Phosphoproteomics, co-IP, LIN52-S28 mutagenesis, and kinase inhibition\",\n      \"pmids\": [\"21498570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address LIN37's own regulation or modifications\", \"Direct repressive activity of LIN37 not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Isolated LIN37 as the subunit uniquely required for DREAM repression: its loss abolishes target-gene silencing while leaving all other subunits at promoters, and it cooperates with RB to enforce quiescence.\",\n      \"evidence\": \"Lin37-knockout mouse cells with ChIP, transcriptomics, and Rb/Lin37 double-KO cell-cycle analysis\",\n      \"pmids\": [\"28920576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which LIN37 converts a bound complex into a repressive one not resolved\", \"Structural basis unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Positioned LIN37 and RB as the key effectors through which p53 represses cell-cycle genes, since their joint loss abrogates p53-dependent repression and the G1/S checkpoint.\",\n      \"evidence\": \"CRISPR single/double knockouts of LIN37 and RB with RNA-seq and cell-cycle analysis\",\n      \"pmids\": [\"31400114\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Connection between p53 signaling and DREAM assembly mechanistically undefined\", \"Direct vs indirect coupling to p53 unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed a quiescence-specific genome-protective role: LIN37/DREAM represses HR genes to block DNA end resection and homologous recombination in G0, independent of 53BP1.\",\n      \"evidence\": \"LIN37-knockout cells with resection/HR assays, RAD51 foci, and epistasis with 53BP1 and BRCA1\",\n      \"pmids\": [\"34477552\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why this role is restricted to G0 and not cycling G1 not fully explained\", \"No structural detail on HR-gene promoter engagement\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided the structural basis for LIN37 function, showing it forms a LIN9-LIN37 scaffold organizing the MuvB core and enabling nucleosome binding and stabilization of the +1 nucleosome at repressed promoters.\",\n      \"evidence\": \"Crystal structure of a LIN9-LIN37 subcomplex, in vitro nucleosome-binding and promoter reconstitution, and ChIP-seq in arrested cells\",\n      \"pmids\": [\"35082292\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nucleosome stabilization mechanistically silences transcription not fully resolved\", \"Structure of full MuvB or DREAM not determined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Distinguished LIN37 from other MuvB subunits by showing it is dispensable for ESC self-renewal and G2/M progression, unlike LIN54 and LIN52.\",\n      \"evidence\": \"CRISPR knockout of individual MuvB components in mouse ESCs with cell-cycle and pluripotency readouts\",\n      \"pmids\": [\"35148988\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not explain the molecular basis of LIN37's context-specific dispensability\", \"Negative finding limited to ESC context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LIN37 mechanistically converts a promoter-bound MuvB core into an active repressive state—and whether its own regulation links DREAM to specific upstream signals—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No defined post-translational regulation of LIN37 itself\", \"Mechanism connecting +1 nucleosome stabilization to transcriptional silencing incomplete\", \"No structure of LIN37 within full DREAM\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 5, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 5, 8]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [\"DREAM complex\", \"MuvB core complex\"],\n    \"partners\": [\"LIN9\", \"LIN52\", \"LIN54\", \"RBBP4\", \"p130\", \"E2F4\", \"B-MYB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":8,"faith_total":8,"faith_pct":100.0}}