{"gene":"LIN28B","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":2011,"finding":"Unlike Lin28A, Lin28B represses let-7 processing through a Zcchc11-independent mechanism by functioning in the nucleus, where it sequesters primary let-7 transcripts (pri-let-7) and inhibits their processing by the Microprocessor complex.","method":"Zcchc11 depletion experiments, nuclear fractionation, functional comparison of Lin28A vs Lin28B mechanisms in human cancer cells","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal mechanistic dissection with multiple orthogonal methods, replicated across cell lines and xenograft models","pmids":["22118463"],"is_preprint":false},{"year":2012,"finding":"LIN28B signals through repression of let-7 miRNAs, which consequently results in elevated MYCN protein expression in neuroblastoma cells, and LIN28B expression in the sympathetic adrenergic lineage is sufficient to induce neuroblastoma development in a mouse model.","method":"Mouse transgenic model (LIN28B expression in sympathetic adrenergic lineage), let-7 miRNA measurement, MYCN protein expression analysis, in vivo neuroblastoma induction","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse model with mechanistic pathway confirmation (LIN28B→let-7→MYCN), replicated across cell lines and animal models","pmids":["23042116"],"is_preprint":false},{"year":2006,"finding":"LIN28B protein is predominantly localized in the cytoplasm but shows cell cycle-dependent nuclear translocation in Huh7 cells, and induced expression of LIN28B promotes cancer cell proliferation.","method":"Western blot with anti-LIN28B antibody, subcellular localization studies, tet-off inducible expression system, cell proliferation assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization experiment with functional consequence, single lab with two methods","pmids":["16971064"],"is_preprint":false},{"year":2016,"finding":"SIRT6 loss results in histone hyperacetylation at the Lin28B promoter, Myc recruitment, and pronounced induction of Lin28B; SIRT6 thus suppresses pancreatic cancer through epigenetic control of Lin28b expression.","method":"ChIP for histone acetylation and Myc at Lin28B promoter, SIRT6 loss-of-function mouse models, Lin28B knockdown/rescue experiments in PDAC","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating promoter histone hyperacetylation and Myc recruitment, validated in multiple mouse models with functional outcomes","pmids":["27180906"],"is_preprint":false},{"year":2013,"finding":"LIN28B directly binds a large number of mRNAs in the human transcriptome and modestly augments protein levels of these target mRNAs in vivo; furthermore, Let-7 miRNAs have a profound repressive effect on intestinal tissue growth that supersedes LIN28B-independent mRNA binding effects.","method":"CLIP-seq (ribonucleoprotein cross-linking, immunoprecipitation, high-throughput sequencing), intestine-specific transgenic mouse models, Let-7 deletion (mirLet7c2/mirLet7b genes), intestine-specific Let-7 rescue","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — CLIP-seq for direct RNA binding combined with in vivo genetic rescue experiments in multiple transgenic mouse models","pmids":["24142874"],"is_preprint":false},{"year":2011,"finding":"LIN28B promotes colon cancer cell migration, invasion and transformation of immortalized colonic epithelial cells; additionally, LIN28B protein directly binds LGR5 and PROM1 mRNA to increase their expression independently of let-7 repression, suggesting a let-7-independent mechanism of post-transcriptional regulation.","method":"Constitutive LIN28B expression in colon cancer cells, RNA immunoprecipitation (RIP) of LGR5 and PROM1 mRNA, let-7 restoration experiments, migration/invasion assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP demonstrating direct mRNA binding plus functional let-7 rescue experiments, single lab","pmids":["21625210"],"is_preprint":false},{"year":2013,"finding":"LIN28B directly binds most expressed mRNAs and let-7 microRNA family members as identified by PAR-CLIP at nucleotide resolution; the position of binding sites reflects the known structural orientation of the CSD and ZNF RNA-binding domains; LIN28B knockdown reduces protein synthesis from its RNA targets.","method":"PAR-CLIP and iDo-PAR-CLIP (nucleotide-resolution binding site mapping), quantitative shotgun proteomics of LIN28B-depleted cells, cell proliferation assays","journal":"RNA biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — nucleotide-resolution PAR-CLIP with orthogonal proteomic validation, rigorous domain-level structural validation","pmids":["23770886"],"is_preprint":false},{"year":2020,"finding":"LIN28B directly interacts with ribosomes and BCL11A mRNA, suppressing BCL11A mRNA translation independently of its role in regulating let-7 microRNAs, thereby controlling fetal hemoglobin (HbF) induction during human hematopoietic development; BCL11A is identified as the major target of LIN28B-mediated HbF induction.","method":"Unbiased genomic and proteomic analyses, ribosome association assays, RNA immunoprecipitation, LIN28B knockdown/overexpression in erythroid cells, let-7-independent functional dissection","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (proteomics, ribosome profiling, RIP), mechanistic dissection separating let-7-dependent and -independent functions","pmids":["31959994"],"is_preprint":false},{"year":2013,"finding":"LIN28B overexpression in adult human erythroblasts reduces let-7 expression, significantly increases fetal hemoglobin (HbF) to >30% of total hemoglobin, and down-regulates BCL11A (a repressor of γ-globin); experimental suppression of let-7 independently reduces BCL11A and increases HbF, placing the LIN28B→let-7→BCL11A axis upstream of γ-globin regulation.","method":"Lentiviral transduction for LIN28B knockdown/overexpression in human erythroblasts, qRT-PCR for let-7, HbF measurement, BCL11A expression analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional (KD and OE) with multiple molecular and functional readouts, let-7 manipulation confirms pathway","pmids":["23798711"],"is_preprint":false},{"year":2015,"finding":"Lin28B promotes fetal B-1 lymphopoiesis through the transcription factor Arid3a, which is a key target of Let-7; modulation of Let-7 in fetal pro-B cells is sufficient to alter fetal B-1 development, and intact BCR signaling is required for B1a B cell generation from Lin28b-transduced bone marrow progenitors.","method":"Transgenic Lin28b expression in adult BM progenitors, Let-7 modulation in fetal pro-B cells, BCR signaling manipulation, Arid3a knockdown/overexpression","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic interventions (Lin28b, Let-7, Arid3a, BCR) with defined cellular phenotypes in vivo","pmids":["25753579"],"is_preprint":false},{"year":2015,"finding":"LIN28B activates the LIN28B→let-7→HMGA2 axis in NSCLC via NF-κB p65, which occupies the LIN28B first intron and activates LIN28B transcription; MUC1-C induces this axis as an upstream regulator.","method":"ChIP assay demonstrating NF-κB p65 chromatin occupancy at LIN28B intron 1, dominant-negative MUC1-C mutant, peptide inhibitor, siRNA knockdown, HMGA2 expression analysis","journal":"Molecular cancer research : MCR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for NF-κB at LIN28B promoter/intron plus multiple LIN28B functional experiments, single lab","pmids":["25368430"],"is_preprint":false},{"year":2015,"finding":"LIN28B promotes fetal regulatory T cell (Treg) differentiation by maintaining expression of TGF-β signaling mediators (TGF-βRI, TGF-βRIII, SMAD2) that are let-7 targets; knockdown of Lin28b in fetal T cells reduces let-7 targets TGF-βRI, TGF-βRIII, and SMAD2, decreasing TGF-β signaling and Treg differentiation.","method":"Lin28b knockdown in naive fetal T cells, TGF-β receptor and SMAD2 expression analysis, SMAD2/SMAD3 phosphorylation measurement, in vitro Treg differentiation assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct knockdown with mechanistic pathway identification (let-7 targets TGF-β components), single lab","pmids":["27793996"],"is_preprint":false},{"year":2015,"finding":"At low cell density, Merlin/NF2 is phosphorylated and does not bind to Lin28B, allowing Lin28B to enter the nucleus and bind to pri-let-7 miRNAs to inhibit their maturation; cell-cell contact triggers Merlin/NF2 dephosphorylation, which sequesters Lin28B in the cytoplasm and permits pri-let-7 maturation, representing a Hippo-independent tumor-suppressive pathway.","method":"Merlin/NF2 phosphorylation status analysis, co-immunoprecipitation of Merlin/NF2 and Lin28B, subcellular fractionation, pri-let-7 maturation assays, YAP1/TAZ-independent functional studies","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating Merlin/NF2-Lin28B interaction and subcellular localization change, mechanistic functional validation, single lab","pmids":["26997273"],"is_preprint":false},{"year":2015,"finding":"IKKβ sustains cancer cell stemness through a positive feedback loop in which TCF7L2 (TCF4) binds directly to intron 1 of the LIN28B gene to enhance LIN28B expression, and LIN28B in turn promotes TCF7L2 mRNA translation.","method":"TCF7L2 ChIP at LIN28B intron 1, LIN28B RNAi, IKKβ pharmacological inhibition, in vivo xenograft models","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating direct TCF7L2 binding at LIN28B locus plus functional in vivo validation, single lab","pmids":["25744721"],"is_preprint":false},{"year":2015,"finding":"MYCN regulates LIN28B expression in neuroblastoma via two parallel mechanisms: (1) indirectly via MYCN suppression of miR-26a-5p (which targets LIN28B 3'UTR), establishing an MYCN-miR-26a-5p-LIN28B axis; and (2) directly via MYCN binding to the LIN28B promoter.","method":"LIN28B 3'UTR luciferase reporter screen, miR-26a-5p functional assays, ChIP for MYCN at LIN28B promoter, Tet-regulatable MYCN transgene expression system","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and luciferase reporter for direct promoter binding, MYCN-regulatable cell model, single lab","pmids":["26123663"],"is_preprint":false},{"year":2020,"finding":"LIN28B binds active gene promoters in neuroblastoma cells through protein-protein interaction with the zinc-finger transcription factor ZNF143, activating transcriptional targets including adrenergic core regulatory circuitry transcription factors and GSK3B and L1CAM; a LIN28B mutant unable to inhibit let-7 retains this transcriptional function, defining a let-7-independent nuclear role.","method":"ChIP-seq (genome-wide chromatin immunoprecipitation sequencing), co-immunoprecipitation of LIN28B and ZNF143, let-7-processing-deficient LIN28B mutant, in vivo neuroblastoma mouse model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP-seq plus Co-IP for direct protein-protein interaction, orthogonal validation with let-7-incapable mutant and in vivo model","pmids":["32601179"],"is_preprint":false},{"year":2015,"finding":"LIN28B identifies RAN as a downstream target by directly binding RAN mRNA and by promoting RAN Binding Protein 2 (RANBP2) expression; LIN28B and RAN signaling converge on Aurora kinase A (AURKA) activity to drive neuroblastoma oncogenesis.","method":"LIN28B-RAN mRNA binding assay (RNA immunoprecipitation), RANBP2 expression analysis, AURKA activity measurement, somatic chromosome 12q24 gain analysis","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP demonstrating direct LIN28B-RAN mRNA binding plus functional convergence on AURKA, single lab","pmids":["26481147"],"is_preprint":false},{"year":2019,"finding":"Lin28b directly interacts with Igf2bp3 (another RNA-binding protein); co-expression of Lin28b and Igf2bp3 in adult HSPCs jointly stabilizes thousands of mRNAs by binding at the same sites, including Pax5 and Arid3a mRNAs, and Igf2bp3 mRNA itself (autoregulatory loop), reactivating fetal-like B-cell development more efficiently than either factor alone.","method":"Single-cell RNA sequencing, proteomics (in situ analysis), RNA immunoprecipitation demonstrating co-binding at same mRNA sites, enforced co-expression in adult HSPCs, in vivo B-cell development assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — proteomics plus RIP showing direct co-binding at same mRNA sites, orthogonal scRNA-seq and in vivo functional validation","pmids":["31221665"],"is_preprint":false},{"year":2020,"finding":"LIN28B promotes neuroendocrine prostate cancer (t-NEPC) development through suppression of let-7 miRNA, leading to de-repression of HMGA2, which then drives SOX2 expression; LIN28B depletion by CRISPR inhibited t-NEPC tumorigenesis and xenograft growth.","method":"CRISPR-based LIN28B depletion, immunohistochemistry validation in patient biopsies, let-7 and HMGA2 expression analysis, SOX2 expression assay, xenograft tumor model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO with in vivo validation, mechanistic pathway (LIN28B→let-7→HMGA2→SOX2) confirmed by multiple orthogonal approaches","pmids":["32634132"],"is_preprint":false},{"year":2021,"finding":"NSUN2 induces m5C modification of GRB2 mRNA, and LIN28B acts as a mediator that recognizes m5C-modified GRB2 mRNA to stabilize it, thereby activating PI3K/AKT and ERK/MAPK signaling in esophageal squamous cell carcinoma.","method":"Transcriptome-wide m5C profiling, NSUN2 knockout mouse models, RIP demonstrating LIN28B binding to m5C-modified GRB2 mRNA, PI3K/AKT and ERK/MAPK pathway activity measurement","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m5C transcriptome profiling plus RIP for LIN28B-GRB2 mRNA interaction, in vivo KO model validation, single lab","pmids":["34345012"],"is_preprint":false},{"year":2020,"finding":"LIN28B regulates the stability of EWS-FLI1 mRNA in a subset (~10%) of Ewing sarcomas; LIN28B depletion leads to decreased EWS-FLI1 expression and its direct transcriptional network, abrogating Ewing sarcoma cell self-renewal and tumorigenicity.","method":"LIN28B depletion experiments, EWS-FLI1 mRNA stability assay, pharmacological LIN28B inhibition, in vitro and in vivo tumorigenicity assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mRNA stability measurement plus pharmacological inhibition mimicking depletion phenotype, single lab","pmids":["32234488"],"is_preprint":false},{"year":2018,"finding":"LIN28B directly binds to AKT2 mRNA via RNA-IP and enhances AKT2 protein expression, thereby regulating FOXO3A phosphorylation and decreasing BIM transcription to inhibit apoptosis in ovarian cancer cells.","method":"RNA-IP microarray analysis, RNA immunoprecipitation confirming LIN28B-AKT2 mRNA binding, BIM expression analysis, FOXO3A phosphorylation assay, functional apoptosis assay","journal":"Signal transduction and targeted therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP demonstrating direct AKT2 mRNA binding plus downstream pathway validation, single lab","pmids":["30174831"],"is_preprint":false},{"year":2020,"finding":"LIN28B alters ribosomal dynamics: it utilizes both its cold shock domain and zinc finger RNA-binding domains to preferentially interact with MYCN-induced transcripts of the ribosomal complex, enhancing their translation in a let-7-independent manner.","method":"Polyribosome fractionation with RNA-seq, domain-specific mutagenesis (CSD and ZNF domains), MYCN-amplified neuroblastoma xenografts with in vitro and in vivo metastasis assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1 / Strong — polyribosome profiling with domain mutagenesis demonstrating domain-specific mechanism, orthogonal in vitro and in vivo validation","pmids":["34779407"],"is_preprint":false},{"year":2020,"finding":"KRAS promotes Lin28B nuclear translocation through PKCβ, which directly phosphorylates Lin28B at serine 243; nuclear Lin28B then upregulates TET3 mRNA/protein by blocking mature let-7i production, and TET3 further promotes Lin28B expression, forming a Lin28B/let-7i/TET3 feedback loop in pancreatic cancer.","method":"PKCβ kinase assay showing S243 phosphorylation of Lin28B, subcellular fractionation demonstrating nuclear translocation, let-7i maturation assays, TET3 expression analysis, feedback loop validation","journal":"Molecular oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct phosphorylation site identification plus nuclear translocation assay and feedback loop demonstration, single lab","pmids":["33107691"],"is_preprint":false},{"year":2018,"finding":"Lin28B regulates the abundance of STAU1 mRNA via regulation of miR-142-3p maturation; as Lin28B decreases during neuronal differentiation, increased mature miR-142-3p reduces STAU1 mRNA stability, establishing a Lin28B→miR-142-3p→STAU1 regulatory axis in neuronal differentiation.","method":"Lin28B and STAU1 loss/gain-of-function experiments, miRNA maturation assays, mRNA stability assays for STAU1, transcriptome analysis of SMD targets, mouse neural precursor cell validation","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional functional experiments with miRNA maturation and mRNA stability assays, validated in primary mouse neural precursor cells","pmids":["29099484"],"is_preprint":false},{"year":2022,"finding":"OTUD6B deubiquitylase directly stabilizes LIN28B protein in a cell cycle-specific manner (at G1/S); stabilized LIN28B drives MYC expression at G1/S to allow rapid S-phase entry in multiple myeloma; silencing OTUD6B or LIN28B inhibits multiple myeloma outgrowth in vivo.","method":"DUB screen in multiple myeloma, ubiquitylation assays demonstrating OTUD6B-mediated LIN28B stabilization, cell cycle synchronization, LIN28B knockdown, in vivo xenograft models","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct ubiquitylation/deubiquitylation assay identifying LIN28B as OTUD6B substrate, cell cycle-resolved mechanism, orthogonal in vivo validation","pmids":["36059274"],"is_preprint":false},{"year":2022,"finding":"SIRT6 directly interacts with and deacetylates Lin28B in vascular endothelial cells; Sirt6 overexpression decreases Lin28B expression and suppresses pyroptosis through the Lin28B/let-7 pathway.","method":"Co-immunoprecipitation demonstrating Sirt6-Lin28B interaction, deacetylation assay, Lin28B knockdown experiments, pyroptosis assays (PI staining, GSDMD cleavage, LDH/IL-1β release), let-7 expression measurement","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and deacetylation assay for direct interaction plus functional pyroptosis readout, single lab","pmids":["35978508"],"is_preprint":false},{"year":2023,"finding":"OCT4 targets the LIN28B nucleosome through three OCT4 binding events: two use POUS domains and one uses POUS-loop-POUHD region where POUHD acts as a wedge to unwrap ~25 base pairs of DNA; multiple OCT4 molecules cooperatively open H1-condensed nucleosome arrays containing the LIN28B nucleosome.","method":"Cryo-EM high-resolution structural determination of LIN28B nucleosome-OCT4 complexes, ESRRB-nucleosome-OCT4 structural analysis, biochemical nucleosome opening assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM structure with biochemical validation, defines mechanism of pioneer factor nucleosome targeting at LIN28B locus","pmids":["37327775"],"is_preprint":false},{"year":2019,"finding":"Lin28B promotes fetal-like platelet function by acting as a negative regulator of P-selectin expression in megakaryocytes/platelets; LIN28B overexpression in adult mice significantly reduces P-selectin expression in platelets.","method":"LIN28B overexpression in adult mice, platelet P-selectin expression measurement, fetal hematopoietic progenitor transplantation experiments, transcriptional analysis of Lin28b and Hmga2 in fetal vs adult megakaryocytes","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct overexpression model with functional readout (P-selectin), transplantation confirming cell-intrinsic regulation, single lab","pmids":["30622145"],"is_preprint":false},{"year":2015,"finding":"LIN28B regulates developmental timing in the murine cochlea: prolonged LIN28B expression delays prosensory cell cycle withdrawal and differentiation, causing hair cell and supporting cell patterning defects; LIN28B also positively regulates postnatal hair cell production via let-7-independent mechanisms for differentiation timing.","method":"Conditional Lin28B transgenic mouse models, let-7g overexpression transgenic mice, cochlear cell cycle exit and differentiation analysis, Notch inhibition-based HC production assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two complementary transgenic models (LIN28B OE and let-7g OE) with defined cellular phenotypes in vivo, single lab","pmids":["26139524"],"is_preprint":false},{"year":2020,"finding":"LIN28B loss of function (conditional deletion or let-7g overexpression) suppresses Akt-mTORC1 activity in cochlear supporting cells, impairing their ability to generate hair cells; LIN28B overexpression increases Akt-mTORC1 activity and allows de-differentiation of maturing supporting cells into progenitor-like cells, and this effect is abolished by mTORC1 inhibitor rapamycin.","method":"Conditional LIN28B deletion, let-7g overexpression, murine cochlear organoid and explant cultures, Akt-mTORC1 activity measurement, rapamycin treatment (mTORC1 inhibitor), hair cell counting","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO plus pharmacological rescue with rapamycin, bidirectional genetic manipulation, mechanistic pathway defined (LIN28B→mTORC1)","pmids":["32826333"],"is_preprint":false},{"year":2018,"finding":"LIN28B directly binds to and posttranscriptionally regulates CLDN1 (claudin 1) mRNA in colorectal cancer cells, and LIN28B-mediated CLDN1 expression enhances collective invasion, cell migration, and metastatic liver tumor formation; NOTCH3 is a downstream effector of the LIN28B/CLDN1 axis.","method":"RNA immunoprecipitation demonstrating LIN28B-CLDN1 mRNA direct binding, LIN28B KD/OE functional assays, murine metastatic CRC model, bulk RNA sequencing of metastatic tumors, NOTCH3 genetic and pharmacologic manipulation","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP for direct mRNA binding plus in vivo metastasis model and pathway validation, single lab","pmids":["37318881"],"is_preprint":false},{"year":2018,"finding":"LIN28B directly binds NRP-1 3'UTR mRNA, increasing NRP-1 mRNA stability and expression, and activates downstream Wnt/β-catenin signaling to confer stemness in gastric cancer cells; NRP-1 knockdown or Wnt/β-catenin antagonism rescues LIN28B overexpression effects.","method":"RNA immunoprecipitation demonstrating LIN28B-NRP-1 3'UTR binding, NRP-1 mRNA stability assay, Wnt/β-catenin signaling pathway analysis, NRP-1 knockdown rescue experiments","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP demonstrating direct 3'UTR binding plus mRNA stability assay and pathway rescue, single lab","pmids":["29787985"],"is_preprint":false},{"year":2022,"finding":"The hematopoietic developmental switch from fetal to adult output is regulated by the Lin28b/let-7 axis via the Polycomb repressor complex 1 (PRC1) component Cbx2; Cbx2 is a downstream effector of Lin28b/let-7 that regulates chromatin modification and transcription factor expression controlling hematopoietic maturation timing.","method":"Transcriptomic data mining comparing juvenile and adult HSPCs, gene regulatory network reconstruction, Cbx2-/- mouse hematopoietic analysis, Lin28b/let-7 axis manipulation","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO of Cbx2 with defined hematopoietic phenotype plus transcriptomic network analysis, single lab","pmids":["35385744"],"is_preprint":false},{"year":2023,"finding":"ALDH2 directly binds to LIN28B protein, hindering LIN28B binding to ELK3 mRNA and thereby reducing ELK3 mRNA stability and expression, which impairs endothelial barrier function in abdominal aortic aneurysm.","method":"Co-immunoprecipitation/molecular binding assay demonstrating ALDH2-LIN28B interaction, LIN28B-ELK3 mRNA binding competition assay, ALDH2 endothelial-specific KD/KO mouse models, endothelial barrier function assays","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP demonstrating ALDH2-LIN28B protein interaction and LIN28B-ELK3 mRNA binding competition, in vivo endothelial KO validation, single lab","pmids":["37822152"],"is_preprint":false},{"year":2016,"finding":"TRIM71 post-transcriptionally represses Lin28B expression in a ubiquitin-transfer-activity-dependent manner; TRIM71 ubiquitin transfer activity-deficient mutant has no effect on Lin28B levels or cancer cell proliferation/invasion, identifying TRIM71 as an E3 ubiquitin ligase that targets Lin28B for degradation.","method":"TRIM71 overexpression with wild-type and ubiquitin-transfer-deficient mutant, Lin28B and HMGA2 expression analysis, NSCLC proliferation and invasion assays, in vivo tumor formation","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis of TRIM71 catalytic activity demonstrating ubiquitin-transfer-dependent Lin28B repression, functional in vivo validation, single lab","pmids":["27821801"],"is_preprint":false}],"current_model":"LIN28B is an RNA-binding protein (containing a cold shock domain and CCHC zinc finger domains) that primarily functions in the nucleus to sequester primary let-7 transcripts and block Microprocessor-mediated processing (distinct from Lin28A's cytoplasmic, TUTase-dependent mechanism), thereby de-repressing let-7 target oncogenes such as MYCN, HMGA2, IGF2BP1, and MYC; independently of let-7, LIN28B binds hundreds of mRNAs directly to stabilize them and enhance their translation, binds ribosomal transcripts via both its CSD and ZNF domains to boost translational output, and interacts with partner proteins such as Igf2bp3, ZNF143, and OTUD6B (which deubiquitylates and stabilizes LIN28B at G1/S); LIN28B subcellular localization is dynamically regulated—serine 243 phosphorylation by PKCβ drives nuclear translocation, while Merlin/NF2 dephosphorylation sequesters it in the cytoplasm—and its expression is controlled epigenetically by SIRT6-mediated histone deacetylation at its promoter and transcriptionally by Myc/NF-κB/TCF7L2/OCT4; collectively these mechanisms make LIN28B a central post-transcriptional regulator of developmental timing, stem cell identity, hematopoietic fetal-adult switching, and oncogenesis."},"narrative":{"mechanistic_narrative":"LIN28B is a post-transcriptional regulator that governs developmental timing, stem-cell identity, and oncogenesis through both let-7-dependent and let-7-independent mechanisms [PMID:22118463, PMID:24142874]. Distinct from LIN28A, LIN28B acts in the nucleus, where it sequesters primary let-7 transcripts and blocks their processing by the Microprocessor, thereby de-repressing let-7 target oncogenes including MYCN and HMGA2 [PMID:22118463, PMID:23042116, PMID:32634132]. This let-7 blockade underlies LIN28B's capacity to induce neuroblastoma in the sympathetic adrenergic lineage via elevated MYCN [PMID:23042116] and to drive neuroendocrine prostate cancer through an HMGA2→SOX2 cascade [PMID:32634132]. Independently of let-7, LIN28B directly binds large numbers of mRNAs, using its cold-shock and zinc-finger RNA-binding domains, to stabilize transcripts and augment their translation [PMID:24142874, PMID:23770886]; it also engages ribosomes and ribosomal-complex transcripts to boost translational output [PMID:31959994, PMID:34779407]. Through these direct RNA interactions LIN28B suppresses BCL11A translation to induce fetal hemoglobin during human erythropoiesis [PMID:31959994, PMID:23798711] and, together with the let-7→Arid3a and let-7→Cbx2 axes, controls the fetal-to-adult hematopoietic switch and fetal B-1 lymphopoiesis [PMID:25753579, PMID:35385744]. In a separate nuclear role, LIN28B binds active gene promoters via protein-protein interaction with the transcription factor ZNF143 to activate adrenergic core regulatory transcription, a function retained by a let-7-incapable mutant [PMID:32601179]. LIN28B activity is tightly controlled: its subcellular distribution is set by PKCβ-mediated Ser243 phosphorylation driving nuclear entry [PMID:33107691] and by Merlin/NF2 dephosphorylation that sequesters it in the cytoplasm [PMID:26997273]; its protein level is stabilized at G1/S by the deubiquitylase OTUD6B to drive MYC and S-phase entry [PMID:36059274] and antagonized by the E3 ligase TRIM71 [PMID:27821801]; and its transcription is gated epigenetically by SIRT6 and induced by NF-κB, TCF7L2, and MYCN [PMID:27180906, PMID:25368430, PMID:25744721, PMID:26123663].","teleology":[{"year":2006,"claim":"Established the basic cellular behavior of LIN28B before its molecular function was known, showing it is largely cytoplasmic with cell-cycle-dependent nuclear shuttling and that it promotes proliferation.","evidence":"Subcellular localization and tet-off inducible expression in Huh7 cells","pmids":["16971064"],"confidence":"Medium","gaps":["No RNA target or molecular mechanism defined","Trigger for nuclear translocation not identified"]},{"year":2011,"claim":"Resolved how LIN28B differs mechanistically from LIN28A, showing it represses let-7 in the nucleus by sequestering pri-let-7 from the Microprocessor rather than via Zcchc11/TUTase.","evidence":"Zcchc11 depletion, nuclear fractionation, and Lin28A/B comparison in human cancer cells","pmids":["22118463"],"confidence":"High","gaps":["Structural basis of pri-let-7 sequestration not resolved","How nuclear localization is regulated unknown"]},{"year":2011,"claim":"Provided first evidence of a let-7-independent function by showing LIN28B directly binds and upregulates specific mRNAs (LGR5, PROM1) while also driving transformation.","evidence":"RIP, let-7 restoration, and migration/invasion assays in colon cancer cells","pmids":["21625210"],"confidence":"Medium","gaps":["Binding shown by RIP without nucleotide resolution","Translational vs stability contribution not separated"]},{"year":2012,"claim":"Demonstrated LIN28B is oncogenic in vivo through the let-7→MYCN axis, establishing causal sufficiency for neuroblastoma initiation.","evidence":"Transgenic LIN28B expression in sympathetic adrenergic lineage with let-7 and MYCN readouts","pmids":["23042116"],"confidence":"High","gaps":["Relative contribution of let-7-independent functions in this model not dissected"]},{"year":2013,"claim":"Defined the genome-wide direct RNA-binding landscape of LIN28B at nucleotide resolution and linked binding to enhanced translation, anchoring its let-7-independent role in transcriptome-wide mRNA regulation.","evidence":"CLIP-seq/PAR-CLIP with proteomics and in vivo intestinal transgenic/let-7 rescue mouse models","pmids":["24142874","23770886"],"confidence":"High","gaps":["Functional significance varies by tissue — let-7 effect supersedes direct binding in intestine","Domain contributions to individual targets not fully resolved"]},{"year":2013,"claim":"Connected LIN28B to fetal hemoglobin regulation, placing the LIN28B→let-7→BCL11A axis upstream of γ-globin.","evidence":"Lentiviral LIN28B knockdown/overexpression and let-7 suppression in adult human erythroblasts","pmids":["23798711"],"confidence":"High","gaps":["At this stage BCL11A regulation attributed to let-7, not direct translational control"]},{"year":2015,"claim":"Identified multiple transcriptional and post-transcriptional inputs controlling LIN28B abundance and localization, framing it as a tightly gated node in cancer and contact-dependent signaling.","evidence":"ChIP for NF-κB p65 and TCF7L2 at LIN28B intron 1, MYCN ChIP/miR-26a-5p assays, and Merlin/NF2 Co-IP with fractionation","pmids":["25368430","25744721","26123663","26997273"],"confidence":"Medium","gaps":["Each regulatory circuit shown in a single lab/context","Interplay among the competing inputs unresolved"]},{"year":2015,"claim":"Extended LIN28B/let-7 control to fetal-specific immune and developmental programs, identifying Arid3a, TGF-β signaling components, and cochlear timing as effectors.","evidence":"Transgenic/knockdown Lin28b with let-7 modulation in fetal B-1 cells, fetal Tregs, and conditional cochlear mouse models","pmids":["25753579","27793996","26139524"],"confidence":"Medium","gaps":["Direct vs indirect contributions to each lineage program not fully separated"]},{"year":2015,"claim":"Expanded the oncogenic effector network of LIN28B by showing convergence on RAN/RANBP2 and AURKA in neuroblastoma.","evidence":"RIP for LIN28B-RAN mRNA binding, RANBP2/AURKA activity, and 12q24 gain analysis","pmids":["26481147"],"confidence":"Medium","gaps":["Mechanism of AURKA activation downstream of RAN not fully detailed"]},{"year":2018,"claim":"Catalogued multiple direct mRNA targets through which LIN28B drives cancer phenotypes, establishing recurrent stability/translation control of growth and invasion mediators.","evidence":"RIP for AKT2, CLDN1, and NRP-1 mRNAs with downstream FOXO3A/BIM, NOTCH3, and Wnt/β-catenin readouts across cancer models","pmids":["30174831","37318881","29787985"],"confidence":"Medium","gaps":["Each target validated in a single cancer context","Common sequence/structural binding determinants across targets not unified"]},{"year":2019,"claim":"Showed LIN28B cooperates with a partner RNA-binding protein, Igf2bp3, co-binding shared mRNA sites to reactivate fetal-like programs more efficiently than either factor alone.","evidence":"Proteomics, RIP co-binding mapping, scRNA-seq, and enforced co-expression in adult HSPCs","pmids":["31221665"],"confidence":"High","gaps":["Stoichiometry and structural basis of co-binding unresolved"]},{"year":2020,"claim":"Defined a let-7-independent translational mechanism for BCL11A and a domain-resolved role in ribosomal-transcript translation, mechanistically separating LIN28B's direct RNA functions from let-7 repression.","evidence":"Ribosome association/RIP for BCL11A and polyribosome profiling with CSD/ZNF domain mutagenesis in erythroid and neuroblastoma systems","pmids":["31959994","34779407"],"confidence":"High","gaps":["How LIN28B selects ribosomal vs other transcripts not fully defined"]},{"year":2020,"claim":"Revealed a chromatin-associated, let-7-independent nuclear function in which LIN28B partners with ZNF143 to activate transcription at active promoters.","evidence":"ChIP-seq, Co-IP of LIN28B-ZNF143, let-7-processing-deficient mutant, and in vivo neuroblastoma model","pmids":["32601179"],"confidence":"High","gaps":["Whether LIN28B contacts DNA directly or only via ZNF143 not resolved"]},{"year":2020,"claim":"Identified PKCβ-mediated Ser243 phosphorylation as a direct switch driving LIN28B nuclear translocation downstream of KRAS, with a TET3 feedback loop.","evidence":"PKCβ kinase assay, subcellular fractionation, and let-7i/TET3 feedback validation in pancreatic cancer","pmids":["33107691"],"confidence":"Medium","gaps":["Single lab; interplay with Merlin/NF2-controlled localization untested"]},{"year":2020,"claim":"Demonstrated LIN28B-dependent stabilization of disease-defining transcripts in additional tumors, broadening its mRNA-stabilizing oncogenic role.","evidence":"EWS-FLI1 mRNA stability and pharmacological LIN28B inhibition in Ewing sarcoma with in vivo assays","pmids":["32234488"],"confidence":"Medium","gaps":["Effect restricted to ~10% of cases; direct binding to EWS-FLI1 mRNA not shown at nucleotide resolution"]},{"year":2021,"claim":"Linked LIN28B to RNA modification recognition, showing it reads m5C-modified GRB2 mRNA to stabilize it and activate growth signaling.","evidence":"Transcriptome-wide m5C profiling, NSUN2 KO, and RIP in esophageal squamous cell carcinoma","pmids":["34345012"],"confidence":"Medium","gaps":["Direct preference of LIN28B for m5C marks vs sequence not biochemically isolated"]},{"year":2022,"claim":"Resolved cell-cycle-specific control of LIN28B protein stability, identifying OTUD6B as a deubiquitylase that stabilizes it at G1/S to drive MYC and S-phase entry.","evidence":"DUB screen, ubiquitylation assays, cell-cycle synchronization, and xenografts in multiple myeloma","pmids":["36059274"],"confidence":"High","gaps":["The opposing E3 ligase in this context not defined","Relation to TRIM71-mediated degradation untested"]},{"year":2022,"claim":"Clarified upstream epigenetic and post-translational control by SIRT6, both repressing the LIN28B promoter and directly deacetylating the protein.","evidence":"ChIP at the Lin28B promoter plus Co-IP/deacetylation assays in pancreatic cancer and vascular endothelial cells","pmids":["27180906","35978508"],"confidence":"Medium","gaps":["Functional consequence of LIN28B acetylation site(s) not mapped"]},{"year":2023,"claim":"Provided structural insight into the LIN28B locus as a model nucleosome substrate for pioneer-factor OCT4-mediated chromatin opening, and identified ALDH2 as a competitor that blocks LIN28B from its mRNA target ELK3.","evidence":"Cryo-EM of OCT4-LIN28B nucleosome complexes; Co-IP and binding-competition assays for ALDH2-LIN28B in aortic aneurysm models","pmids":["37327775","37822152"],"confidence":"High","gaps":["OCT4 study addresses LIN28B-locus chromatin, not LIN28B protein function","ALDH2 competition shown in single vascular context"]},{"year":null,"claim":"How the competing localization, stabilization, and transcription circuits are integrated to set LIN28B activity in a given cell, and how let-7-dependent vs ZNF143/ribosomal let-7-independent functions are partitioned, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model coordinating PKCβ/Merlin localization, OTUD6B/TRIM71 stability, and SIRT6/NF-κB transcription","Quantitative apportioning of let-7-dependent vs independent contributions per tissue lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,4,5,6,7,16,21,31,32,34]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[6,7,22]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[15]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2,12,15,23]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,12]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[7,22]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,4,6,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,3,18,20]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[9,29,30,33]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[15]}],"complexes":[],"partners":["ZNF143","IGF2BP3","OTUD6B","TRIM71","SIRT6","NF2","ALDH2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6ZN17","full_name":"Protein lin-28 homolog B","aliases":[],"length_aa":250,"mass_kda":27.1,"function":"Suppressor of microRNA (miRNA) biogenesis, including that of let-7 and possibly of miR107, miR-143 and miR-200c. Binds primary let-7 transcripts (pri-let-7), including pri-let-7g and pri-let-7a-1, and sequester them in the nucleolus, away from the microprocessor complex, hence preventing their processing into mature miRNA (PubMed:22118463). Does not act on pri-miR21 (PubMed:22118463). The repression of let-7 expression is required for normal development and contributes to maintain the pluripotent state of embryonic stem cells by preventing let-7-mediated differentiation. When overexpressed, recruits ZCCHC11/TUT4 uridylyltransferase to pre-let-7 transcripts, leading to their terminal uridylation and degradation (PubMed:19703396). This activity might not be relevant in vivo, as LIN28B-mediated inhibition of let-7 miRNA maturation appears to be ZCCHC11-independent (PubMed:22118463). Interaction with target pre-miRNAs occurs via an 5'-GGAG-3' motif in the pre-miRNA terminal loop. Mediates MYC-induced let-7 repression (By similarity). When overexpressed, isoform 1 stimulates growth of the breast adenocarcinoma cell line MCF-7. Isoform 2 has no effect on cell growth","subcellular_location":"Nucleus; Nucleus, nucleolus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q6ZN17/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LIN28B","classification":"Not Classified","n_dependent_lines":36,"n_total_lines":1208,"dependency_fraction":0.029801324503311258},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LIN28B","total_profiled":1310},"omim":[{"mim_id":"618703","title":"ZINC FINGER PROTEIN 281; ZNF281","url":"https://www.omim.org/entry/618703"},{"mim_id":"612883","title":"MENARCHE, AGE AT, QUANTITATIVE TRAIT LOCUS 3; MENAQ3","url":"https://www.omim.org/entry/612883"},{"mim_id":"612882","title":"MENARCHE, AGE AT, QUANTITATIVE TRAIT LOCUS 2; 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Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/37822152","citation_count":22,"is_preprint":false},{"pmid":"29099484","id":"PMC_29099484","title":"Lin28B and miR-142-3p regulate neuronal differentiation by modulating Staufen1 expression.","date":"2017","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/29099484","citation_count":22,"is_preprint":false},{"pmid":"25655194","id":"PMC_25655194","title":"The role of Lin28b in myeloid and mast cell differentiation and mast cell malignancy.","date":"2015","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/25655194","citation_count":22,"is_preprint":false},{"pmid":"24885919","id":"PMC_24885919","title":"Lin28B expression correlates with aggressive clinicopathological characteristics in breast invasive ductal carcinoma.","date":"2014","source":"Cancer biotherapy & radiopharmaceuticals","url":"https://pubmed.ncbi.nlm.nih.gov/24885919","citation_count":22,"is_preprint":false},{"pmid":"34548635","id":"PMC_34548635","title":"The LIN28B/TGF-β/TGFBI feedback loop promotes cell migration and tumour initiation potential in cholangiocarcinoma.","date":"2021","source":"Cancer gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/34548635","citation_count":21,"is_preprint":false},{"pmid":"36059274","id":"PMC_36059274","title":"The OTUD6B-LIN28B-MYC axis determines the proliferative state in multiple myeloma.","date":"2022","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/36059274","citation_count":21,"is_preprint":false},{"pmid":"28301057","id":"PMC_28301057","title":"The correlation between LIN28B gene potentially functional variants and Wilms tumor susceptibility in Chinese children.","date":"2017","source":"Journal of clinical laboratory 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promote metastasis in MYCN-driven malignancy.","date":"2021","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/34779407","citation_count":20,"is_preprint":false},{"pmid":"29503447","id":"PMC_29503447","title":"LIN28B enhanced tumorigenesis in an autochthonous KRASG12V-driven lung carcinoma mouse model.","date":"2018","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/29503447","citation_count":20,"is_preprint":false},{"pmid":"28947981","id":"PMC_28947981","title":"Lin28B facilitates the progression and metastasis of pancreatic ductal adenocarcinoma.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/28947981","citation_count":20,"is_preprint":false},{"pmid":"32627014","id":"PMC_32627014","title":"Propofol‑induced miR‑125a‑5p inhibits the proliferation and metastasis of ovarian cancer by suppressing LIN28B.","date":"2020","source":"Molecular medicine 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Calif.)","url":"https://pubmed.ncbi.nlm.nih.gov/32072603","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48788,"output_tokens":9304,"usd":0.142962,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":19589,"output_tokens":5683,"usd":0.12001,"stage2_stop_reason":"end_turn"},"total_usd":0.262972,"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\": 2011,\n      \"finding\": \"Unlike Lin28A, Lin28B represses let-7 processing through a Zcchc11-independent mechanism by functioning in the nucleus, where it sequesters primary let-7 transcripts (pri-let-7) and inhibits their processing by the Microprocessor complex.\",\n      \"method\": \"Zcchc11 depletion experiments, nuclear fractionation, functional comparison of Lin28A vs Lin28B mechanisms in human cancer cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal mechanistic dissection with multiple orthogonal methods, replicated across cell lines and xenograft models\",\n      \"pmids\": [\"22118463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LIN28B signals through repression of let-7 miRNAs, which consequently results in elevated MYCN protein expression in neuroblastoma cells, and LIN28B expression in the sympathetic adrenergic lineage is sufficient to induce neuroblastoma development in a mouse model.\",\n      \"method\": \"Mouse transgenic model (LIN28B expression in sympathetic adrenergic lineage), let-7 miRNA measurement, MYCN protein expression analysis, in vivo neuroblastoma induction\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse model with mechanistic pathway confirmation (LIN28B→let-7→MYCN), replicated across cell lines and animal models\",\n      \"pmids\": [\"23042116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LIN28B protein is predominantly localized in the cytoplasm but shows cell cycle-dependent nuclear translocation in Huh7 cells, and induced expression of LIN28B promotes cancer cell proliferation.\",\n      \"method\": \"Western blot with anti-LIN28B antibody, subcellular localization studies, tet-off inducible expression system, cell proliferation assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization experiment with functional consequence, single lab with two methods\",\n      \"pmids\": [\"16971064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SIRT6 loss results in histone hyperacetylation at the Lin28B promoter, Myc recruitment, and pronounced induction of Lin28B; SIRT6 thus suppresses pancreatic cancer through epigenetic control of Lin28b expression.\",\n      \"method\": \"ChIP for histone acetylation and Myc at Lin28B promoter, SIRT6 loss-of-function mouse models, Lin28B knockdown/rescue experiments in PDAC\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating promoter histone hyperacetylation and Myc recruitment, validated in multiple mouse models with functional outcomes\",\n      \"pmids\": [\"27180906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LIN28B directly binds a large number of mRNAs in the human transcriptome and modestly augments protein levels of these target mRNAs in vivo; furthermore, Let-7 miRNAs have a profound repressive effect on intestinal tissue growth that supersedes LIN28B-independent mRNA binding effects.\",\n      \"method\": \"CLIP-seq (ribonucleoprotein cross-linking, immunoprecipitation, high-throughput sequencing), intestine-specific transgenic mouse models, Let-7 deletion (mirLet7c2/mirLet7b genes), intestine-specific Let-7 rescue\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — CLIP-seq for direct RNA binding combined with in vivo genetic rescue experiments in multiple transgenic mouse models\",\n      \"pmids\": [\"24142874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LIN28B promotes colon cancer cell migration, invasion and transformation of immortalized colonic epithelial cells; additionally, LIN28B protein directly binds LGR5 and PROM1 mRNA to increase their expression independently of let-7 repression, suggesting a let-7-independent mechanism of post-transcriptional regulation.\",\n      \"method\": \"Constitutive LIN28B expression in colon cancer cells, RNA immunoprecipitation (RIP) of LGR5 and PROM1 mRNA, let-7 restoration experiments, migration/invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP demonstrating direct mRNA binding plus functional let-7 rescue experiments, single lab\",\n      \"pmids\": [\"21625210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LIN28B directly binds most expressed mRNAs and let-7 microRNA family members as identified by PAR-CLIP at nucleotide resolution; the position of binding sites reflects the known structural orientation of the CSD and ZNF RNA-binding domains; LIN28B knockdown reduces protein synthesis from its RNA targets.\",\n      \"method\": \"PAR-CLIP and iDo-PAR-CLIP (nucleotide-resolution binding site mapping), quantitative shotgun proteomics of LIN28B-depleted cells, cell proliferation assays\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — nucleotide-resolution PAR-CLIP with orthogonal proteomic validation, rigorous domain-level structural validation\",\n      \"pmids\": [\"23770886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIN28B directly interacts with ribosomes and BCL11A mRNA, suppressing BCL11A mRNA translation independently of its role in regulating let-7 microRNAs, thereby controlling fetal hemoglobin (HbF) induction during human hematopoietic development; BCL11A is identified as the major target of LIN28B-mediated HbF induction.\",\n      \"method\": \"Unbiased genomic and proteomic analyses, ribosome association assays, RNA immunoprecipitation, LIN28B knockdown/overexpression in erythroid cells, let-7-independent functional dissection\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (proteomics, ribosome profiling, RIP), mechanistic dissection separating let-7-dependent and -independent functions\",\n      \"pmids\": [\"31959994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LIN28B overexpression in adult human erythroblasts reduces let-7 expression, significantly increases fetal hemoglobin (HbF) to >30% of total hemoglobin, and down-regulates BCL11A (a repressor of γ-globin); experimental suppression of let-7 independently reduces BCL11A and increases HbF, placing the LIN28B→let-7→BCL11A axis upstream of γ-globin regulation.\",\n      \"method\": \"Lentiviral transduction for LIN28B knockdown/overexpression in human erythroblasts, qRT-PCR for let-7, HbF measurement, BCL11A expression analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional (KD and OE) with multiple molecular and functional readouts, let-7 manipulation confirms pathway\",\n      \"pmids\": [\"23798711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Lin28B promotes fetal B-1 lymphopoiesis through the transcription factor Arid3a, which is a key target of Let-7; modulation of Let-7 in fetal pro-B cells is sufficient to alter fetal B-1 development, and intact BCR signaling is required for B1a B cell generation from Lin28b-transduced bone marrow progenitors.\",\n      \"method\": \"Transgenic Lin28b expression in adult BM progenitors, Let-7 modulation in fetal pro-B cells, BCR signaling manipulation, Arid3a knockdown/overexpression\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic interventions (Lin28b, Let-7, Arid3a, BCR) with defined cellular phenotypes in vivo\",\n      \"pmids\": [\"25753579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LIN28B activates the LIN28B→let-7→HMGA2 axis in NSCLC via NF-κB p65, which occupies the LIN28B first intron and activates LIN28B transcription; MUC1-C induces this axis as an upstream regulator.\",\n      \"method\": \"ChIP assay demonstrating NF-κB p65 chromatin occupancy at LIN28B intron 1, dominant-negative MUC1-C mutant, peptide inhibitor, siRNA knockdown, HMGA2 expression analysis\",\n      \"journal\": \"Molecular cancer research : MCR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for NF-κB at LIN28B promoter/intron plus multiple LIN28B functional experiments, single lab\",\n      \"pmids\": [\"25368430\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LIN28B promotes fetal regulatory T cell (Treg) differentiation by maintaining expression of TGF-β signaling mediators (TGF-βRI, TGF-βRIII, SMAD2) that are let-7 targets; knockdown of Lin28b in fetal T cells reduces let-7 targets TGF-βRI, TGF-βRIII, and SMAD2, decreasing TGF-β signaling and Treg differentiation.\",\n      \"method\": \"Lin28b knockdown in naive fetal T cells, TGF-β receptor and SMAD2 expression analysis, SMAD2/SMAD3 phosphorylation measurement, in vitro Treg differentiation assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct knockdown with mechanistic pathway identification (let-7 targets TGF-β components), single lab\",\n      \"pmids\": [\"27793996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"At low cell density, Merlin/NF2 is phosphorylated and does not bind to Lin28B, allowing Lin28B to enter the nucleus and bind to pri-let-7 miRNAs to inhibit their maturation; cell-cell contact triggers Merlin/NF2 dephosphorylation, which sequesters Lin28B in the cytoplasm and permits pri-let-7 maturation, representing a Hippo-independent tumor-suppressive pathway.\",\n      \"method\": \"Merlin/NF2 phosphorylation status analysis, co-immunoprecipitation of Merlin/NF2 and Lin28B, subcellular fractionation, pri-let-7 maturation assays, YAP1/TAZ-independent functional studies\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating Merlin/NF2-Lin28B interaction and subcellular localization change, mechanistic functional validation, single lab\",\n      \"pmids\": [\"26997273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"IKKβ sustains cancer cell stemness through a positive feedback loop in which TCF7L2 (TCF4) binds directly to intron 1 of the LIN28B gene to enhance LIN28B expression, and LIN28B in turn promotes TCF7L2 mRNA translation.\",\n      \"method\": \"TCF7L2 ChIP at LIN28B intron 1, LIN28B RNAi, IKKβ pharmacological inhibition, in vivo xenograft models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating direct TCF7L2 binding at LIN28B locus plus functional in vivo validation, single lab\",\n      \"pmids\": [\"25744721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MYCN regulates LIN28B expression in neuroblastoma via two parallel mechanisms: (1) indirectly via MYCN suppression of miR-26a-5p (which targets LIN28B 3'UTR), establishing an MYCN-miR-26a-5p-LIN28B axis; and (2) directly via MYCN binding to the LIN28B promoter.\",\n      \"method\": \"LIN28B 3'UTR luciferase reporter screen, miR-26a-5p functional assays, ChIP for MYCN at LIN28B promoter, Tet-regulatable MYCN transgene expression system\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and luciferase reporter for direct promoter binding, MYCN-regulatable cell model, single lab\",\n      \"pmids\": [\"26123663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIN28B binds active gene promoters in neuroblastoma cells through protein-protein interaction with the zinc-finger transcription factor ZNF143, activating transcriptional targets including adrenergic core regulatory circuitry transcription factors and GSK3B and L1CAM; a LIN28B mutant unable to inhibit let-7 retains this transcriptional function, defining a let-7-independent nuclear role.\",\n      \"method\": \"ChIP-seq (genome-wide chromatin immunoprecipitation sequencing), co-immunoprecipitation of LIN28B and ZNF143, let-7-processing-deficient LIN28B mutant, in vivo neuroblastoma mouse model\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP-seq plus Co-IP for direct protein-protein interaction, orthogonal validation with let-7-incapable mutant and in vivo model\",\n      \"pmids\": [\"32601179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LIN28B identifies RAN as a downstream target by directly binding RAN mRNA and by promoting RAN Binding Protein 2 (RANBP2) expression; LIN28B and RAN signaling converge on Aurora kinase A (AURKA) activity to drive neuroblastoma oncogenesis.\",\n      \"method\": \"LIN28B-RAN mRNA binding assay (RNA immunoprecipitation), RANBP2 expression analysis, AURKA activity measurement, somatic chromosome 12q24 gain analysis\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP demonstrating direct LIN28B-RAN mRNA binding plus functional convergence on AURKA, single lab\",\n      \"pmids\": [\"26481147\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Lin28b directly interacts with Igf2bp3 (another RNA-binding protein); co-expression of Lin28b and Igf2bp3 in adult HSPCs jointly stabilizes thousands of mRNAs by binding at the same sites, including Pax5 and Arid3a mRNAs, and Igf2bp3 mRNA itself (autoregulatory loop), reactivating fetal-like B-cell development more efficiently than either factor alone.\",\n      \"method\": \"Single-cell RNA sequencing, proteomics (in situ analysis), RNA immunoprecipitation demonstrating co-binding at same mRNA sites, enforced co-expression in adult HSPCs, in vivo B-cell development assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — proteomics plus RIP showing direct co-binding at same mRNA sites, orthogonal scRNA-seq and in vivo functional validation\",\n      \"pmids\": [\"31221665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIN28B promotes neuroendocrine prostate cancer (t-NEPC) development through suppression of let-7 miRNA, leading to de-repression of HMGA2, which then drives SOX2 expression; LIN28B depletion by CRISPR inhibited t-NEPC tumorigenesis and xenograft growth.\",\n      \"method\": \"CRISPR-based LIN28B depletion, immunohistochemistry validation in patient biopsies, let-7 and HMGA2 expression analysis, SOX2 expression assay, xenograft tumor model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO with in vivo validation, mechanistic pathway (LIN28B→let-7→HMGA2→SOX2) confirmed by multiple orthogonal approaches\",\n      \"pmids\": [\"32634132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NSUN2 induces m5C modification of GRB2 mRNA, and LIN28B acts as a mediator that recognizes m5C-modified GRB2 mRNA to stabilize it, thereby activating PI3K/AKT and ERK/MAPK signaling in esophageal squamous cell carcinoma.\",\n      \"method\": \"Transcriptome-wide m5C profiling, NSUN2 knockout mouse models, RIP demonstrating LIN28B binding to m5C-modified GRB2 mRNA, PI3K/AKT and ERK/MAPK pathway activity measurement\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m5C transcriptome profiling plus RIP for LIN28B-GRB2 mRNA interaction, in vivo KO model validation, single lab\",\n      \"pmids\": [\"34345012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIN28B regulates the stability of EWS-FLI1 mRNA in a subset (~10%) of Ewing sarcomas; LIN28B depletion leads to decreased EWS-FLI1 expression and its direct transcriptional network, abrogating Ewing sarcoma cell self-renewal and tumorigenicity.\",\n      \"method\": \"LIN28B depletion experiments, EWS-FLI1 mRNA stability assay, pharmacological LIN28B inhibition, in vitro and in vivo tumorigenicity assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mRNA stability measurement plus pharmacological inhibition mimicking depletion phenotype, single lab\",\n      \"pmids\": [\"32234488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LIN28B directly binds to AKT2 mRNA via RNA-IP and enhances AKT2 protein expression, thereby regulating FOXO3A phosphorylation and decreasing BIM transcription to inhibit apoptosis in ovarian cancer cells.\",\n      \"method\": \"RNA-IP microarray analysis, RNA immunoprecipitation confirming LIN28B-AKT2 mRNA binding, BIM expression analysis, FOXO3A phosphorylation assay, functional apoptosis assay\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP demonstrating direct AKT2 mRNA binding plus downstream pathway validation, single lab\",\n      \"pmids\": [\"30174831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIN28B alters ribosomal dynamics: it utilizes both its cold shock domain and zinc finger RNA-binding domains to preferentially interact with MYCN-induced transcripts of the ribosomal complex, enhancing their translation in a let-7-independent manner.\",\n      \"method\": \"Polyribosome fractionation with RNA-seq, domain-specific mutagenesis (CSD and ZNF domains), MYCN-amplified neuroblastoma xenografts with in vitro and in vivo metastasis assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — polyribosome profiling with domain mutagenesis demonstrating domain-specific mechanism, orthogonal in vitro and in vivo validation\",\n      \"pmids\": [\"34779407\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"KRAS promotes Lin28B nuclear translocation through PKCβ, which directly phosphorylates Lin28B at serine 243; nuclear Lin28B then upregulates TET3 mRNA/protein by blocking mature let-7i production, and TET3 further promotes Lin28B expression, forming a Lin28B/let-7i/TET3 feedback loop in pancreatic cancer.\",\n      \"method\": \"PKCβ kinase assay showing S243 phosphorylation of Lin28B, subcellular fractionation demonstrating nuclear translocation, let-7i maturation assays, TET3 expression analysis, feedback loop validation\",\n      \"journal\": \"Molecular oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct phosphorylation site identification plus nuclear translocation assay and feedback loop demonstration, single lab\",\n      \"pmids\": [\"33107691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Lin28B regulates the abundance of STAU1 mRNA via regulation of miR-142-3p maturation; as Lin28B decreases during neuronal differentiation, increased mature miR-142-3p reduces STAU1 mRNA stability, establishing a Lin28B→miR-142-3p→STAU1 regulatory axis in neuronal differentiation.\",\n      \"method\": \"Lin28B and STAU1 loss/gain-of-function experiments, miRNA maturation assays, mRNA stability assays for STAU1, transcriptome analysis of SMD targets, mouse neural precursor cell validation\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional functional experiments with miRNA maturation and mRNA stability assays, validated in primary mouse neural precursor cells\",\n      \"pmids\": [\"29099484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"OTUD6B deubiquitylase directly stabilizes LIN28B protein in a cell cycle-specific manner (at G1/S); stabilized LIN28B drives MYC expression at G1/S to allow rapid S-phase entry in multiple myeloma; silencing OTUD6B or LIN28B inhibits multiple myeloma outgrowth in vivo.\",\n      \"method\": \"DUB screen in multiple myeloma, ubiquitylation assays demonstrating OTUD6B-mediated LIN28B stabilization, cell cycle synchronization, LIN28B knockdown, in vivo xenograft models\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct ubiquitylation/deubiquitylation assay identifying LIN28B as OTUD6B substrate, cell cycle-resolved mechanism, orthogonal in vivo validation\",\n      \"pmids\": [\"36059274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SIRT6 directly interacts with and deacetylates Lin28B in vascular endothelial cells; Sirt6 overexpression decreases Lin28B expression and suppresses pyroptosis through the Lin28B/let-7 pathway.\",\n      \"method\": \"Co-immunoprecipitation demonstrating Sirt6-Lin28B interaction, deacetylation assay, Lin28B knockdown experiments, pyroptosis assays (PI staining, GSDMD cleavage, LDH/IL-1β release), let-7 expression measurement\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and deacetylation assay for direct interaction plus functional pyroptosis readout, single lab\",\n      \"pmids\": [\"35978508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"OCT4 targets the LIN28B nucleosome through three OCT4 binding events: two use POUS domains and one uses POUS-loop-POUHD region where POUHD acts as a wedge to unwrap ~25 base pairs of DNA; multiple OCT4 molecules cooperatively open H1-condensed nucleosome arrays containing the LIN28B nucleosome.\",\n      \"method\": \"Cryo-EM high-resolution structural determination of LIN28B nucleosome-OCT4 complexes, ESRRB-nucleosome-OCT4 structural analysis, biochemical nucleosome opening assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM structure with biochemical validation, defines mechanism of pioneer factor nucleosome targeting at LIN28B locus\",\n      \"pmids\": [\"37327775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Lin28B promotes fetal-like platelet function by acting as a negative regulator of P-selectin expression in megakaryocytes/platelets; LIN28B overexpression in adult mice significantly reduces P-selectin expression in platelets.\",\n      \"method\": \"LIN28B overexpression in adult mice, platelet P-selectin expression measurement, fetal hematopoietic progenitor transplantation experiments, transcriptional analysis of Lin28b and Hmga2 in fetal vs adult megakaryocytes\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct overexpression model with functional readout (P-selectin), transplantation confirming cell-intrinsic regulation, single lab\",\n      \"pmids\": [\"30622145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LIN28B regulates developmental timing in the murine cochlea: prolonged LIN28B expression delays prosensory cell cycle withdrawal and differentiation, causing hair cell and supporting cell patterning defects; LIN28B also positively regulates postnatal hair cell production via let-7-independent mechanisms for differentiation timing.\",\n      \"method\": \"Conditional Lin28B transgenic mouse models, let-7g overexpression transgenic mice, cochlear cell cycle exit and differentiation analysis, Notch inhibition-based HC production assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two complementary transgenic models (LIN28B OE and let-7g OE) with defined cellular phenotypes in vivo, single lab\",\n      \"pmids\": [\"26139524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LIN28B loss of function (conditional deletion or let-7g overexpression) suppresses Akt-mTORC1 activity in cochlear supporting cells, impairing their ability to generate hair cells; LIN28B overexpression increases Akt-mTORC1 activity and allows de-differentiation of maturing supporting cells into progenitor-like cells, and this effect is abolished by mTORC1 inhibitor rapamycin.\",\n      \"method\": \"Conditional LIN28B deletion, let-7g overexpression, murine cochlear organoid and explant cultures, Akt-mTORC1 activity measurement, rapamycin treatment (mTORC1 inhibitor), hair cell counting\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO plus pharmacological rescue with rapamycin, bidirectional genetic manipulation, mechanistic pathway defined (LIN28B→mTORC1)\",\n      \"pmids\": [\"32826333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LIN28B directly binds to and posttranscriptionally regulates CLDN1 (claudin 1) mRNA in colorectal cancer cells, and LIN28B-mediated CLDN1 expression enhances collective invasion, cell migration, and metastatic liver tumor formation; NOTCH3 is a downstream effector of the LIN28B/CLDN1 axis.\",\n      \"method\": \"RNA immunoprecipitation demonstrating LIN28B-CLDN1 mRNA direct binding, LIN28B KD/OE functional assays, murine metastatic CRC model, bulk RNA sequencing of metastatic tumors, NOTCH3 genetic and pharmacologic manipulation\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP for direct mRNA binding plus in vivo metastasis model and pathway validation, single lab\",\n      \"pmids\": [\"37318881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LIN28B directly binds NRP-1 3'UTR mRNA, increasing NRP-1 mRNA stability and expression, and activates downstream Wnt/β-catenin signaling to confer stemness in gastric cancer cells; NRP-1 knockdown or Wnt/β-catenin antagonism rescues LIN28B overexpression effects.\",\n      \"method\": \"RNA immunoprecipitation demonstrating LIN28B-NRP-1 3'UTR binding, NRP-1 mRNA stability assay, Wnt/β-catenin signaling pathway analysis, NRP-1 knockdown rescue experiments\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP demonstrating direct 3'UTR binding plus mRNA stability assay and pathway rescue, single lab\",\n      \"pmids\": [\"29787985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The hematopoietic developmental switch from fetal to adult output is regulated by the Lin28b/let-7 axis via the Polycomb repressor complex 1 (PRC1) component Cbx2; Cbx2 is a downstream effector of Lin28b/let-7 that regulates chromatin modification and transcription factor expression controlling hematopoietic maturation timing.\",\n      \"method\": \"Transcriptomic data mining comparing juvenile and adult HSPCs, gene regulatory network reconstruction, Cbx2-/- mouse hematopoietic analysis, Lin28b/let-7 axis manipulation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO of Cbx2 with defined hematopoietic phenotype plus transcriptomic network analysis, single lab\",\n      \"pmids\": [\"35385744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ALDH2 directly binds to LIN28B protein, hindering LIN28B binding to ELK3 mRNA and thereby reducing ELK3 mRNA stability and expression, which impairs endothelial barrier function in abdominal aortic aneurysm.\",\n      \"method\": \"Co-immunoprecipitation/molecular binding assay demonstrating ALDH2-LIN28B interaction, LIN28B-ELK3 mRNA binding competition assay, ALDH2 endothelial-specific KD/KO mouse models, endothelial barrier function assays\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP demonstrating ALDH2-LIN28B protein interaction and LIN28B-ELK3 mRNA binding competition, in vivo endothelial KO validation, single lab\",\n      \"pmids\": [\"37822152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIM71 post-transcriptionally represses Lin28B expression in a ubiquitin-transfer-activity-dependent manner; TRIM71 ubiquitin transfer activity-deficient mutant has no effect on Lin28B levels or cancer cell proliferation/invasion, identifying TRIM71 as an E3 ubiquitin ligase that targets Lin28B for degradation.\",\n      \"method\": \"TRIM71 overexpression with wild-type and ubiquitin-transfer-deficient mutant, Lin28B and HMGA2 expression analysis, NSCLC proliferation and invasion assays, in vivo tumor formation\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis of TRIM71 catalytic activity demonstrating ubiquitin-transfer-dependent Lin28B repression, functional in vivo validation, single lab\",\n      \"pmids\": [\"27821801\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LIN28B is an RNA-binding protein (containing a cold shock domain and CCHC zinc finger domains) that primarily functions in the nucleus to sequester primary let-7 transcripts and block Microprocessor-mediated processing (distinct from Lin28A's cytoplasmic, TUTase-dependent mechanism), thereby de-repressing let-7 target oncogenes such as MYCN, HMGA2, IGF2BP1, and MYC; independently of let-7, LIN28B binds hundreds of mRNAs directly to stabilize them and enhance their translation, binds ribosomal transcripts via both its CSD and ZNF domains to boost translational output, and interacts with partner proteins such as Igf2bp3, ZNF143, and OTUD6B (which deubiquitylates and stabilizes LIN28B at G1/S); LIN28B subcellular localization is dynamically regulated—serine 243 phosphorylation by PKCβ drives nuclear translocation, while Merlin/NF2 dephosphorylation sequesters it in the cytoplasm—and its expression is controlled epigenetically by SIRT6-mediated histone deacetylation at its promoter and transcriptionally by Myc/NF-κB/TCF7L2/OCT4; collectively these mechanisms make LIN28B a central post-transcriptional regulator of developmental timing, stem cell identity, hematopoietic fetal-adult switching, and oncogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LIN28B is a post-transcriptional regulator that governs developmental timing, stem-cell identity, and oncogenesis through both let-7-dependent and let-7-independent mechanisms [#0, #4]. Distinct from LIN28A, LIN28B acts in the nucleus, where it sequesters primary let-7 transcripts and blocks their processing by the Microprocessor, thereby de-repressing let-7 target oncogenes including MYCN and HMGA2 [#0, #1, #18]. This let-7 blockade underlies LIN28B's capacity to induce neuroblastoma in the sympathetic adrenergic lineage via elevated MYCN [#1] and to drive neuroendocrine prostate cancer through an HMGA2\\u2192SOX2 cascade [#18]. Independently of let-7, LIN28B directly binds large numbers of mRNAs, using its cold-shock and zinc-finger RNA-binding domains, to stabilize transcripts and augment their translation [#4, #6]; it also engages ribosomes and ribosomal-complex transcripts to boost translational output [#7, #22]. Through these direct RNA interactions LIN28B suppresses BCL11A translation to induce fetal hemoglobin during human erythropoiesis [#7, #8] and, together with the let-7\\u2192Arid3a and let-7\\u2192Cbx2 axes, controls the fetal-to-adult hematopoietic switch and fetal B-1 lymphopoiesis [#9, #33]. In a separate nuclear role, LIN28B binds active gene promoters via protein-protein interaction with the transcription factor ZNF143 to activate adrenergic core regulatory transcription, a function retained by a let-7-incapable mutant [#15]. LIN28B activity is tightly controlled: its subcellular distribution is set by PKC\\u03b2-mediated Ser243 phosphorylation driving nuclear entry [#23] and by Merlin/NF2 dephosphorylation that sequesters it in the cytoplasm [#12]; its protein level is stabilized at G1/S by the deubiquitylase OTUD6B to drive MYC and S-phase entry [#25] and antagonized by the E3 ligase TRIM71 [#35]; and its transcription is gated epigenetically by SIRT6 and induced by NF-\\u03baB, TCF7L2, and MYCN [#3, #10, #13, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established the basic cellular behavior of LIN28B before its molecular function was known, showing it is largely cytoplasmic with cell-cycle-dependent nuclear shuttling and that it promotes proliferation.\",\n      \"evidence\": \"Subcellular localization and tet-off inducible expression in Huh7 cells\",\n      \"pmids\": [\"16971064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No RNA target or molecular mechanism defined\", \"Trigger for nuclear translocation not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolved how LIN28B differs mechanistically from LIN28A, showing it represses let-7 in the nucleus by sequestering pri-let-7 from the Microprocessor rather than via Zcchc11/TUTase.\",\n      \"evidence\": \"Zcchc11 depletion, nuclear fractionation, and Lin28A/B comparison in human cancer cells\",\n      \"pmids\": [\"22118463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of pri-let-7 sequestration not resolved\", \"How nuclear localization is regulated unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided first evidence of a let-7-independent function by showing LIN28B directly binds and upregulates specific mRNAs (LGR5, PROM1) while also driving transformation.\",\n      \"evidence\": \"RIP, let-7 restoration, and migration/invasion assays in colon cancer cells\",\n      \"pmids\": [\"21625210\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding shown by RIP without nucleotide resolution\", \"Translational vs stability contribution not separated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated LIN28B is oncogenic in vivo through the let-7\\u2192MYCN axis, establishing causal sufficiency for neuroblastoma initiation.\",\n      \"evidence\": \"Transgenic LIN28B expression in sympathetic adrenergic lineage with let-7 and MYCN readouts\",\n      \"pmids\": [\"23042116\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of let-7-independent functions in this model not dissected\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the genome-wide direct RNA-binding landscape of LIN28B at nucleotide resolution and linked binding to enhanced translation, anchoring its let-7-independent role in transcriptome-wide mRNA regulation.\",\n      \"evidence\": \"CLIP-seq/PAR-CLIP with proteomics and in vivo intestinal transgenic/let-7 rescue mouse models\",\n      \"pmids\": [\"24142874\", \"23770886\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance varies by tissue \\u2014 let-7 effect supersedes direct binding in intestine\", \"Domain contributions to individual targets not fully resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected LIN28B to fetal hemoglobin regulation, placing the LIN28B\\u2192let-7\\u2192BCL11A axis upstream of \\u03b3-globin.\",\n      \"evidence\": \"Lentiviral LIN28B knockdown/overexpression and let-7 suppression in adult human erythroblasts\",\n      \"pmids\": [\"23798711\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"At this stage BCL11A regulation attributed to let-7, not direct translational control\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified multiple transcriptional and post-transcriptional inputs controlling LIN28B abundance and localization, framing it as a tightly gated node in cancer and contact-dependent signaling.\",\n      \"evidence\": \"ChIP for NF-\\u03baB p65 and TCF7L2 at LIN28B intron 1, MYCN ChIP/miR-26a-5p assays, and Merlin/NF2 Co-IP with fractionation\",\n      \"pmids\": [\"25368430\", \"25744721\", \"26123663\", \"26997273\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each regulatory circuit shown in a single lab/context\", \"Interplay among the competing inputs unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended LIN28B/let-7 control to fetal-specific immune and developmental programs, identifying Arid3a, TGF-\\u03b2 signaling components, and cochlear timing as effectors.\",\n      \"evidence\": \"Transgenic/knockdown Lin28b with let-7 modulation in fetal B-1 cells, fetal Tregs, and conditional cochlear mouse models\",\n      \"pmids\": [\"25753579\", \"27793996\", \"26139524\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect contributions to each lineage program not fully separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Expanded the oncogenic effector network of LIN28B by showing convergence on RAN/RANBP2 and AURKA in neuroblastoma.\",\n      \"evidence\": \"RIP for LIN28B-RAN mRNA binding, RANBP2/AURKA activity, and 12q24 gain analysis\",\n      \"pmids\": [\"26481147\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of AURKA activation downstream of RAN not fully detailed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Catalogued multiple direct mRNA targets through which LIN28B drives cancer phenotypes, establishing recurrent stability/translation control of growth and invasion mediators.\",\n      \"evidence\": \"RIP for AKT2, CLDN1, and NRP-1 mRNAs with downstream FOXO3A/BIM, NOTCH3, and Wnt/\\u03b2-catenin readouts across cancer models\",\n      \"pmids\": [\"30174831\", \"37318881\", \"29787985\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each target validated in a single cancer context\", \"Common sequence/structural binding determinants across targets not unified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed LIN28B cooperates with a partner RNA-binding protein, Igf2bp3, co-binding shared mRNA sites to reactivate fetal-like programs more efficiently than either factor alone.\",\n      \"evidence\": \"Proteomics, RIP co-binding mapping, scRNA-seq, and enforced co-expression in adult HSPCs\",\n      \"pmids\": [\"31221665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural basis of co-binding unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a let-7-independent translational mechanism for BCL11A and a domain-resolved role in ribosomal-transcript translation, mechanistically separating LIN28B's direct RNA functions from let-7 repression.\",\n      \"evidence\": \"Ribosome association/RIP for BCL11A and polyribosome profiling with CSD/ZNF domain mutagenesis in erythroid and neuroblastoma systems\",\n      \"pmids\": [\"31959994\", \"34779407\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How LIN28B selects ribosomal vs other transcripts not fully defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a chromatin-associated, let-7-independent nuclear function in which LIN28B partners with ZNF143 to activate transcription at active promoters.\",\n      \"evidence\": \"ChIP-seq, Co-IP of LIN28B-ZNF143, let-7-processing-deficient mutant, and in vivo neuroblastoma model\",\n      \"pmids\": [\"32601179\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LIN28B contacts DNA directly or only via ZNF143 not resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified PKC\\u03b2-mediated Ser243 phosphorylation as a direct switch driving LIN28B nuclear translocation downstream of KRAS, with a TET3 feedback loop.\",\n      \"evidence\": \"PKC\\u03b2 kinase assay, subcellular fractionation, and let-7i/TET3 feedback validation in pancreatic cancer\",\n      \"pmids\": [\"33107691\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; interplay with Merlin/NF2-controlled localization untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated LIN28B-dependent stabilization of disease-defining transcripts in additional tumors, broadening its mRNA-stabilizing oncogenic role.\",\n      \"evidence\": \"EWS-FLI1 mRNA stability and pharmacological LIN28B inhibition in Ewing sarcoma with in vivo assays\",\n      \"pmids\": [\"32234488\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effect restricted to ~10% of cases; direct binding to EWS-FLI1 mRNA not shown at nucleotide resolution\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked LIN28B to RNA modification recognition, showing it reads m5C-modified GRB2 mRNA to stabilize it and activate growth signaling.\",\n      \"evidence\": \"Transcriptome-wide m5C profiling, NSUN2 KO, and RIP in esophageal squamous cell carcinoma\",\n      \"pmids\": [\"34345012\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct preference of LIN28B for m5C marks vs sequence not biochemically isolated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved cell-cycle-specific control of LIN28B protein stability, identifying OTUD6B as a deubiquitylase that stabilizes it at G1/S to drive MYC and S-phase entry.\",\n      \"evidence\": \"DUB screen, ubiquitylation assays, cell-cycle synchronization, and xenografts in multiple myeloma\",\n      \"pmids\": [\"36059274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The opposing E3 ligase in this context not defined\", \"Relation to TRIM71-mediated degradation untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Clarified upstream epigenetic and post-translational control by SIRT6, both repressing the LIN28B promoter and directly deacetylating the protein.\",\n      \"evidence\": \"ChIP at the Lin28B promoter plus Co-IP/deacetylation assays in pancreatic cancer and vascular endothelial cells\",\n      \"pmids\": [\"27180906\", \"35978508\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of LIN28B acetylation site(s) not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided structural insight into the LIN28B locus as a model nucleosome substrate for pioneer-factor OCT4-mediated chromatin opening, and identified ALDH2 as a competitor that blocks LIN28B from its mRNA target ELK3.\",\n      \"evidence\": \"Cryo-EM of OCT4-LIN28B nucleosome complexes; Co-IP and binding-competition assays for ALDH2-LIN28B in aortic aneurysm models\",\n      \"pmids\": [\"37327775\", \"37822152\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"OCT4 study addresses LIN28B-locus chromatin, not LIN28B protein function\", \"ALDH2 competition shown in single vascular context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the competing localization, stabilization, and transcription circuits are integrated to set LIN28B activity in a given cell, and how let-7-dependent vs ZNF143/ribosomal let-7-independent functions are partitioned, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coordinating PKC\\u03b2/Merlin localization, OTUD6B/TRIM71 stability, and SIRT6/NF-\\u03baB transcription\", \"Quantitative apportioning of let-7-dependent vs independent contributions per tissue lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 4, 5, 6, 7, 16, 21, 31, 32, 34]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [6, 7, 22]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2, 12, 15, 23]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 12]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [7, 22]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 4, 6, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 3, 18, 20]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 29, 30, 33]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ZNF143\", \"IGF2BP3\", \"OTUD6B\", \"TRIM71\", \"SIRT6\", \"NF2\", \"ALDH2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":7,"faith_pct":85.71428571428571}}