{"gene":"LMO4","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1998,"finding":"LMO4 was identified as a binding partner of LDB1/NLI1 via yeast two-hybrid screening; nuclear retention of LMO proteins is enhanced by the nuclear LIM interactor (NLI/LDB1).","method":"Yeast two-hybrid screen, in situ hybridization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid identification replicated across multiple independent labs in 1998","pmids":["9736723"],"is_preprint":false},{"year":1998,"finding":"LMO4 interacts strongly with CLIM/LDB coregulators via its LIM domain, and interacts with mouse DEAF-1 (DEFORMED EPIDERMAL AUTOREGULATORY FACTOR 1) through a proline-rich C-terminal domain of DEAF-1, defining a novel LIM-interacting domain distinct from HLH and GATA domains.","method":"Expression library screen using CLIM LIM-interaction domain as bait; yeast two-hybrid; domain mapping","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus domain mapping, replicated across labs","pmids":["9860983"],"is_preprint":false},{"year":1998,"finding":"LMO4 interacts with LDB1/NLI1, and enforced LMO1/LMO2 expression may displace LMO4 from its complex with LDB1 in T cell development.","method":"Yeast two-hybrid identification of LMO4 via LDB1 interaction","journal":"Oncogene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single yeast two-hybrid identification, displacement is inferred not directly demonstrated","pmids":["9840944"],"is_preprint":false},{"year":2001,"finding":"LMO4 interacts with the cofactor CtIP and with the BRCA1 tumor suppressor (via BRCA1's C-terminal BRCT domains); a stable trimeric complex of LMO4, BRCA1, and CtIP was demonstrated in vivo, and LDB1 also participates. LMO4 represses BRCA1-mediated transcriptional activation in both yeast and mammalian cells.","method":"Yeast two-hybrid screen, co-immunoprecipitation (in vivo complex), functional transcription reporter assays in yeast and mammalian cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP demonstrating in vivo complex, functional transcription assay in two cell systems, multiple orthogonal methods","pmids":["11751867"],"is_preprint":false},{"year":2001,"finding":"Forced expression of LMO4 inhibited differentiation of mammary epithelial cells in vitro, consistent with a role in maintaining proliferation.","method":"Forced expression/overexpression in mammary epithelial cells, differentiation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function/gain-of-function with defined cellular phenotype, single lab","pmids":["11734645"],"is_preprint":false},{"year":2003,"finding":"NMR solution structures of LMO2-LIM1:ldb1-LID and LMO4-LIM1:ldb1-LID complexes show that ldb1-LID binds to the N-terminal LIM domain of LMO4 in an extended conformation, contributing a third strand to a beta-hairpin in LIM1 domains, providing the first molecular definition of LIM-mediated protein-protein interactions.","method":"NMR solution structure determination (PDB: 1M3V and 1J2O)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution NMR structures of both LMO2 and LMO4 complexes with ldb1, mechanistically defining the LIM:LID interaction","pmids":["12727888"],"is_preprint":false},{"year":2003,"finding":"LMO4 immunoprecipitates with LDB1 in the nuclear fraction of oral carcinoma cells, confirming formation of an LMO4-LDB1 transcription complex in vivo.","method":"Co-immunoprecipitation from nuclear fractions of carcinoma cells","journal":"British journal of cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP in cancer cell lines, no functional follow-up","pmids":["12771919"],"is_preprint":false},{"year":2003,"finding":"LMO4 modulates the transcriptional activity of the bHLH protein HEN1: LMO4 interacts with HEN1 (by mammalian two-hybrid), and LMO4 but not LMO2 augments HEN1-mediated repression of E47 transcription. Overexpression of LMO4 in hippocampal precursor cells prevents HEN1-induced neurite extension.","method":"Mammalian two-hybrid assay, reporter gene assays, overexpression in hippocampal precursor cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — mammalian two-hybrid plus functional reporter assay plus cell-based phenotype, single lab","pmids":["12878195"],"is_preprint":false},{"year":2003,"finding":"Overexpression of LMO4 (sense orientation) reduces neurite number and length in SH-SY5Y neuroblastoma cells, while antisense LMO4 promotes neuritogenesis; LMO4-dependent neuritic effects correlate with altered phosphorylation of cytoskeletal proteins.","method":"Stable transfection of sense/antisense LMO4 cDNA, morphometric analysis, phosphorylation analysis","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — bidirectional gain/loss of function with defined cellular phenotype and molecular correlate, single lab","pmids":["12877980"],"is_preprint":false},{"year":2003,"finding":"A truncating somatic mutation in LMO4 (frameshift at exon 2) generates a LIM1-only mutant that retains LDB1 binding but loses CtIP and BRCA1 association, demonstrating the second LIM domain is required for CtIP/BRCA1 interaction.","method":"Mutation analysis, binding assays comparing wild-type vs. mutant LMO4","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — natural truncation mutant defines domain requirements for binding partners, functional binding assays","pmids":["12925972"],"is_preprint":false},{"year":2004,"finding":"X-ray crystal structure of LMO4 in complex with LDB1-LID (the FLINC4 complex) at high resolution reveals a highly modular structure with Ldb1-LID binding in an extended manner across both LIM domains of LMO4, with extensive hydrophobic and electrostatic interactions. Mutagenic screening of Ldb1-LID (yeast two-hybrid and competition ELISA) identified key interface residues.","method":"X-ray crystallography (high-resolution crystal structure), mutagenic screen assessed by yeast two-hybrid and competition ELISA","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenic validation, multiple orthogonal methods, mechanistically defines tandem LIM:Ldb1 interface","pmids":["15343268"],"is_preprint":false},{"year":2004,"finding":"Lmo4-null mice die perinatally and show severe neural tube defect (exencephaly/anencephaly); conditional null demonstrates LMO4 is required for proper closure of the anterior neural tube, with loss causing abnormal cell proliferation and elevated apoptosis in the neuroepithelium. LMO4 is expressed in neuroepithelial cells and Schwann cell progenitors.","method":"Gene targeting (null mutation), histology, BrdU proliferation assay, TUNEL apoptosis assay","journal":"Molecular and cellular biology / Molecular and cellular neurosciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — independently replicated null mouse phenotype across two labs (PMID 14966285 and 15691703), specific cellular readouts","pmids":["14966285","15691703"],"is_preprint":false},{"year":2004,"finding":"The transcription factor Deaf-1/NUDR is a binding partner of LMO4 in vivo; Deaf-1 knockout mice share overlapping phenotypes with Lmo4 knockouts (exencephaly, vertebral homeotic transformations), indicating they act in a functional complex.","method":"Gene targeting of both Lmo4 and Deaf-1 in mice, phenotypic comparison (genetic epistasis)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — parallel knockout phenotypes in two genes provide strong epistatic evidence for functional complex in vivo","pmids":["14966286"],"is_preprint":false},{"year":2005,"finding":"LMO4 overexpression in the mouse mammary gland (MMTV-Lmo4 transgene) elicits hyperplasia and mammary intraepithelial neoplasia; siRNA knockdown of LMO4 reduces proliferation of breast cancer cells and increases differentiation of mammary epithelial cells; LMO4 overexpression in MCF10A cells promotes cell motility and invasion of extracellular matrix.","method":"Transgenic mouse model (MMTV-Lmo4), siRNA knockdown, Matrigel invasion assay, cell motility assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal approaches (transgenic, RNAi, gain-of-function in non-invasive cells) with specific cellular phenotypes","pmids":["15897450"],"is_preprint":false},{"year":2005,"finding":"Conditional deletion of Lmo4 in mammary epithelium during pregnancy impairs lobuloalveolar development with a 2-fold reduction in BrdU-positive proliferating cells, demonstrating LMO4 is a positive regulator of alveolar epithelial proliferation.","method":"Conditional knockout (Cre-lox), BrdU incorporation, mammary gland histology","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with specific quantitative cellular phenotype (BrdU), single lab but rigorous","pmids":["15856027"],"is_preprint":false},{"year":2006,"finding":"LMO4 mediates calcium-dependent transcription in cortical neurons: calcium influx via VSCCs and NMDA receptors activates LMO4-mediated transactivation via CaM kinase IV and MAP kinase. LMO4 forms a complex with CREB, CLIM1, and CLIM2 (by co-immunoprecipitation). Conditional cortical deletion of Lmo4 disrupts barrel field segregation of thalamocortical afferents in somatosensory cortex.","method":"Luciferase reporter assay (calcium stimulation), pharmacological inhibitors, co-immunoprecipitation, conditional Cre-lox knockout, barrel field histology","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (reporter assay, Co-IP, conditional KO with specific circuit phenotype) in one study","pmids":["16899735"],"is_preprint":false},{"year":2006,"finding":"LMO4 interacts with the MH1 and linker domains of receptor-mediated Smad proteins and associates with the endogenous TGFβ-responsive PAI-1 gene promoter in a TGFβ-dependent manner; LMO4 modulates TGFβ signaling in epithelial cells and potentiates growth-inhibitory effects of TGFβ.","method":"Co-immunoprecipitation (LMO4-Smad interaction), chromatin immunoprecipitation (LMO4 at PAI-1 promoter), TGFβ-responsive reporter gene assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ChIP, and reporter assay, single lab, multiple orthogonal methods","pmids":["16331278"],"is_preprint":false},{"year":2006,"finding":"Get-1/Grhl3 and LMO4 interact functionally (genetically) in epidermal terminal differentiation: double knockout of Get-1 and LMO4 causes more severe stratum corneum defects than Get-1 single knockout alone.","method":"Compound knockout mouse model (Get-1−/−; LMO4−/−), epidermal barrier assays, histology","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in compound knockout, specific epidermal phenotype, single lab","pmids":["16949565"],"is_preprint":false},{"year":2007,"finding":"LMO4 regulates expression of BMP7 by a mechanism involving displacement of HDAC2 from the BMP7 promoter: LMO4 and its cofactor Clim2 are recruited to the BMP7 promoter (ChIP), HDAC2 recruitment is inhibited by LMO4 upregulation, and HDAC2 knockdown upregulates the promoter. Inhibition of BMP7 partially blocks LMO4-mediated effects on apoptosis.","method":"DNA microarray, promoter-reporter assay, chromatin immunoprecipitation (LMO4, Clim2, HDAC2 at BMP7 promoter), siRNA knockdown","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP demonstrating LMO4 and HDAC2 at BMP7 promoter, promoter reporter, multiple orthogonal methods, single lab","pmids":["17452977"],"is_preprint":false},{"year":2007,"finding":"LMO4 is a downstream effector of ATP signaling that promotes neuron survival from hypoxia; extracellular ATP stabilizes LMO4 mRNA via the ARE1 element in the 3'UTR by increasing HuD protein binding, while CUGBP1 binds sequences flanking ARE2 and is destabilized by ATP. ERK and CREB activation by ATP increases LMO4 promoter activity and LMO4 protein stability.","method":"siRNA knockdown, luciferase 3'UTR reporter, RNA-binding protein assays (HuD/CUGBP1), primary LMO4-null neurons","journal":"Experimental cell research / Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (3'UTR reporter, RNA-binding assay, null neuron rescue), single lab","pmids":["17524392","17418808"],"is_preprint":false},{"year":2008,"finding":"GRHL3 and LMO4 interact biochemically and genetically; compound Grhl3/Lmo4 null mice show fully penetrant exencephaly, spina bifida, and eyes-open-at-birth phenotype not seen in individual nulls. ERK1/2 phosphorylation is lost in the epidermis of double-null embryos, actin cable formation is absent at eyelid margins, and keratinocytes from double-null mice fail to heal in scratch assays.","method":"Compound knockout mouse model, biochemical interaction assay, electron microscopy, phospho-ERK immunostaining, in vitro scratch assay","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound genetic knockout, biochemical interaction, multiple orthogonal phenotypic and molecular readouts","pmids":["18619436"],"is_preprint":false},{"year":2008,"finding":"LMO4 is required for vestibular morphogenesis: Lmo4-null mice lack all three semicircular canals and anterior/posterior cristae; canal outpouches fail to form and cell proliferation is reduced in the dorsolateral otocyst. LMO4 controls expression of Bmp4, Fgf10, Msx1, Isl1, Gata3, and Dlx5 in the dorsolateral otocyst.","method":"Gene targeting (null mutation), BrdU proliferation assay, in situ hybridization for otic markers","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — null mouse with specific morphogenetic and molecular phenotypes, multiple markers analyzed","pmids":["19913004"],"is_preprint":false},{"year":2005,"finding":"LMO4 associates with gp130 and JAK1 in mammalian cells; it also interacts with SHP2 and SOCS3, and exists in the gp130 IL-6 receptor complex. LMO4 overexpression enhances STAT3 transcriptional activity and target gene expression, while LMO4 siRNA knockdown decreases STAT3 activity. LMO4 is detected both in the nucleus and cytoplasm.","method":"Yeast two-hybrid screen, in vitro binding assays, co-immunoprecipitation, siRNA stable knockdown, reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus in vitro binding plus Co-IP plus functional assay, single lab","pmids":["15677447"],"is_preprint":false},{"year":2006,"finding":"LKB1 forms a complex with LMO4, GATA-6, and Ldb1, enhancing GATA-mediated transactivation in a kinase-dependent manner; this complex induces p21 expression via a p53-independent mechanism.","method":"Co-immunoprecipitation (complex formation), reporter gene assay (GATA-mediated transactivation, p21 promoter), kinase-dead mutant","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP and reporter assay, single lab, two orthogonal methods","pmids":["16580634"],"is_preprint":false},{"year":2008,"finding":"PPARγ signaling requires LMO4 as an essential cofactor to protect neurons from ischemic injury: LMO4 interacts with PPARγ in a ligand-dependent manner (co-immunoprecipitation, mammalian two-hybrid), promotes RXRα binding to PPARγ, increases PPARγ binding to target DNA, and activates SOD2 promoter. PPARγ agonist failed to reduce cerebral infarction in neuron-specific LMO4-null mice.","method":"Co-immunoprecipitation, mammalian two-hybrid, LMO4-null cortical neurons, conditional forebrain knockout (CaMKIIα-Cre/LMO4loxP), focal ischemia model, promoter reporter assay, MnTBAP rescue","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, two-hybrid, conditional KO in vivo, pharmacological rescue), mechanistically defines LMO4 as PPARγ cofactor","pmids":["19020036"],"is_preprint":false},{"year":2009,"finding":"LMO4 controls the binary fate choice between excitatory V2a and inhibitory V2b spinal interneurons by regulating LIM complexes: LMO4 induces GABAergic V2b interneurons in collaboration with SCL and inhibits Lhx3 from generating glutamatergic V2a interneurons. LMO4 nucleates assembly of a novel LIM-complex containing SCL, Gata2, and NLI, which activates V2b-specific enhancers. In LMO4;SCL compound mutants, V2a cells increase at the expense of V2b cells.","method":"Conditional knockout, compound mutant (LMO4;SCL), enhancer reporter assay, co-immunoprecipitation (complex assembly), in situ hybridization for V2a/V2b markers","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — compound genetic epistasis, Co-IP showing novel complex, reporter assay for enhancer activation, multiple orthogonal methods","pmids":["19323994"],"is_preprint":false},{"year":2009,"finding":"LMO4 is a downstream target of ErbB2 and PI3K signaling in breast cancer cells; LMO4 silencing causes G2/M arrest associated with decreased cullin-3 (E3 ubiquitin ligase component), followed by reductions in Cyclin D1 and Cyclin E. LMO4 expression oscillates through the cell cycle with maximum at G2/M, preceding cullin-3 oscillations.","method":"Gene expression profiling, siRNA knockdown, cell cycle analysis (FACS), immunoblotting, PI3K inhibitor treatment","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown with multiple specific molecular readouts (cell cycle, cullin-3, cyclins), single lab","pmids":["19648968"],"is_preprint":false},{"year":2011,"finding":"LMO4 functions as a co-activator of Neurogenin 2 (NGN2) in the developing cortex: LMO4 and NLI/LDB1 interact with NGN2 simultaneously, forming a multi-protein transcription complex recruited to E-box-containing enhancers of NGN2-target genes. Loss of LMO4 in Lmo4-null embryos impairs neuronal differentiation, and LMO4 expression facilitates NGN2-mediated radial migration of cortical neurons.","method":"Co-immunoprecipitation (LMO4-NLI-NGN2 complex), chromatin immunoprecipitation (complex at NGN2-target enhancers), Lmo4-null embryo analysis, in utero electroporation (migration assay)","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP showing trimeric complex, ChIP, in vivo null phenotype, and functional migration assay; multiple orthogonal methods","pmids":["21652654"],"is_preprint":false},{"year":2011,"finding":"LMO4 is a Slug/Snail interacting protein (direct binding demonstrated); LMO4 morpholino knockdown in Xenopus causes loss of neural crest precursor formation, and misexpression of LMO4 modulates Slug-mediated neural crest induction, indicating LMO4 is an essential cofactor in Snail2-mediated neural crest development.","method":"Morpholino knockdown (Xenopus), misexpression, co-immunoprecipitation/direct binding assay for LMO4-Slug/Snail interaction","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assay plus in vivo loss-of-function with specific NC phenotype, Xenopus model, single lab","pmids":["22119055"],"is_preprint":false},{"year":2011,"finding":"LMO4 is repressed by Alk transcription in the striatum; LMO4 and ERα are associated with the Alk promoter (chromatin immunoprecipitation), and Alk is an estrogen-responsive gene modulated by LMO4 in the striatum. ERα knockout mice show enhanced cocaine sensitization and increased Alk expression.","method":"Chromatin immunoprecipitation (LMO4 and ERα at Alk promoter), ERα knockout, RNA interference in striatum","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP showing LMO4/ERα at Alk promoter, genetic knockout with specific behavioral and molecular readout, single lab","pmids":["21976498"],"is_preprint":false},{"year":2012,"finding":"LMO4 positively regulates ryanodine receptor type 2 (RyR2) expression; forebrain-specific LMO4 knockout neurons have severely compromised calcium-induced calcium release (CICR) modulation of afterhyperpolarization (rescued by single-cell LMO4 overexpression), absent caffeine-potentiated RyR-mediated calcium release, defective CICR-facilitated glutamate release, and reduced CA3-CA1 LTP.","method":"Conditional forebrain knockout, electrophysiology (patch clamp), two-photon calcium imaging, single-cell overexpression rescue, Morris water maze","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with electrophysiology, two-photon imaging, and single-cell rescue; multiple orthogonal methods mechanistically linking LMO4 to RyR2 and CICR","pmids":["22442089"],"is_preprint":false},{"year":2012,"finding":"LMO4 interacts with p53 (co-immunoprecipitation) and inhibits p53-mediated suppression of breast cancer cell colony formation; p53 induction by adriamycin represses LMO4 expression, indicating LMO4 is a transcriptional target of p53.","method":"Co-immunoprecipitation, colony formation assay, RT-PCR/Western blot after ADR treatment","journal":"Life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP with partial functional follow-up, single lab","pmids":["22906635"],"is_preprint":false},{"year":2012,"finding":"LMO4 nitration at tyrosine residues in the cochlea is the primary molecular event in cisplatin-induced ototoxicity: cisplatin induces nitroxidative protein modification and nitration of LMO4 (identified by MALDI-TOF mass spectrometry, confirmed by reciprocal immunoprecipitation and immunoblotting), leading to decreased cochlear LMO4 levels and cochlear apoptosis.","method":"MALDI-TOF mass spectrometry, reciprocal co-immunoprecipitation/immunoblotting, immunofluorescence co-localization of nitrotyrosine and LMO4, in vitro nitration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry identification of nitration confirmed by orthogonal Co-IP/immunoblot and co-localization; mechanistically defines cisplatin-induced post-translational modification of LMO4","pmids":["22493493"],"is_preprint":false},{"year":2012,"finding":"LMO4 is required for normal DEAF1 nuclear export: LMO4 modulates the activity of the DEAF1 nuclear export signal (NES) within a coiled-coil domain, causing nuclear accumulation of constructs containing the LMO4-interaction region of DEAF1. The specific LMO4-binding domain in DEAF1 contains an unstructured region that directly contacts LMO4.","method":"Yeast two-hybrid domain mapping, cell-based NES activity assay, co-expression/localization","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — cell-based localization assay with domain mapping showing functional consequence of LMO4:DEAF1 interaction, single lab","pmids":["22723967"],"is_preprint":false},{"year":2013,"finding":"LMO4 is an essential cofactor in Snail2-mediated epithelial-to-mesenchymal transition and cadherin repression in neuroblastoma and neural crest cells; LMO4 knockdown impairs neuroblastoma cell invasion and neural crest delamination, and LMO4 is required for Snail2-mediated cadherin downregulation.","method":"siRNA/shRNA knockdown, invasion assay, in vivo chick neural crest delamination assay, cadherin expression analysis","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in two model systems (neuroblastoma, chick NC) with specific molecular (cadherin) and cellular (invasion/delamination) readouts, single lab","pmids":["23407937"],"is_preprint":false},{"year":2013,"finding":"HBXIP activates LMO4 transcription by binding to the LMO4 promoter through the transcription factor Sp1 at the −237/−206 region; HBXIP co-immunoprecipitates with Sp1, ChIP shows HBXIP at the LMO4 promoter, and mutation of the Sp1 site abolishes HBXIP-LMO4 promoter interaction.","method":"Co-immunoprecipitation, chromatin immunoprecipitation, electrophoretic mobility shift assay, luciferase reporter, Sp1-binding site mutagenesis","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP, EMSA, and mutagenesis demonstrating HBXIP/Sp1-dependent LMO4 promoter activation, single lab","pmids":["23291272"],"is_preprint":false},{"year":2013,"finding":"The solution NMR structure of LMO4 in complex with CtIP/RBBP8 reveals that CtIP and LDB1 bind to the same face on LMO4 and cannot simultaneously bind LMO4, suggesting competitive binding between these two partners.","method":"NMR solution structure determination, competition binding assay","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic-resolution NMR structure defining binding interface and competitive binding mechanism","pmids":["23353824"],"is_preprint":false},{"year":2014,"finding":"Loss of LMO4 in retinal progenitor cells leads to fewer Bhlhb5-positive GABAergic amacrine and OFF-cone bipolar cells (affecting the postnatal wave), with functional deficit shown by reduced b-wave amplitude on electroretinography; cholinergic/dopaminergic amacrine, rod bipolar, and photoreceptor cell numbers are not affected.","method":"Conditional knockout (Pax6α-Cre/LMO4flox), cell counting by immunostaining, electroretinography","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockout with cell-type specific immunostaining and functional ERG readout, selective phenotype","pmids":["20949055"],"is_preprint":false},{"year":2014,"finding":"The NMR solution structure of the LMO4-LIM2/DEAF1 complex shows that DEAF1's intrinsically disordered LMO4-binding domain becomes structured upon binding LMO4, and DEAF1 binds the same face on LMO4 as LDB1 and CtIP; mutagenic screening identified key residues in LMO4-LIM2 and the N-terminal half of DEAF1's binding domain.","method":"NMR solution structure, yeast two-hybrid mutagenic screening, domain mapping","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with mutagenic validation defining competitive binding surface on LMO4","pmids":["25310299"],"is_preprint":false},{"year":2014,"finding":"LMO4 inactivation in the cochlea causes ectopic formation of an organ of Corti (eOC) in the lateral cochlea with inner/outer hair cells and supporting cells but in mirror-image orientation, demonstrating LMO4 is a negative regulator of sensory organ formation in the cochlea.","method":"Conditional knockout (Lmo4 inactivation), histology, hair cell markers (immunostaining)","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with highly specific ectopic organ phenotype, detailed cellular characterization","pmids":["25057208"],"is_preprint":false},{"year":2014,"finding":"LMO4 regulates the expression of Ca2+ channel subunits Cacna1h and Cacna1e in PVH neurons; PVH-specific LMO4 ablation reduces voltage-activated Ca2+ currents and basal neuronal excitability, leading to hyperphagia. Restoring neuronal activity by DREADD technology suppresses food intake in these mice.","method":"Conditional (PVH-specific) knockout, brain slice electrophysiology (patch clamp for Ca2+ currents), real-time PCR for Ca2+ channel expression, DREADD designer receptor","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with electrophysiological measurement of Ca2+ currents, molecular target identification (RT-PCR), and pharmacogenetic rescue","pmids":["24381275"],"is_preprint":false},{"year":2014,"finding":"Loss of LMO4 in hypothalamic glutamatergic neurons impairs insulin signaling in the hypothalamus and peripheral tissues (liver, skeletal muscle), associated with markedly elevated PTP1B activity; administration of a PTP1B inhibitor to the hypothalamus restores insulin signaling and improves peripheral insulin response in LMO4-deficient mice.","method":"Conditional knockout (glutamatergic neuron-specific), insulin signaling assays (phospho-IR, phospho-Akt), PTP1B activity assay, intracerebroventricular drug delivery","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with specific kinase activity assay and pharmacological rescue, single lab","pmids":["24937445"],"is_preprint":false},{"year":2015,"finding":"LMO4 is required for cisplatin-induced cochlear apoptosis: hair cell-specific Lmo4 conditional knockout mice show elevated auditory brainstem response thresholds after cisplatin; LMO4 deficiency compromises STAT3 phosphorylation (anti-apoptotic) and increases activated caspase-3 in hair cells post-cisplatin.","method":"Conditional knockout (Lmo4lox/lox; Gfi1Cre), auditory brainstem response, immunostaining for phospho-STAT3 and caspase-3","journal":"Molecular neurobiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with functional hearing assay and specific molecular (STAT3/caspase-3) readouts, mechanistically links LMO4 to STAT3-mediated hair cell survival","pmids":["33411315"],"is_preprint":false},{"year":2015,"finding":"LMO4 in the basolateral amygdala (BLA) is required for cue-reward learning but not fear learning or anxiety; knockdown of LMO4 in BLA (but not nucleus accumbens) impairs conditioned reinforcement; molecular analysis identifies a deficit in dopamine D2 receptor signaling in the BLA of Lmo4-deficient mice.","method":"Lmo4-deficient mice, BLA-specific RNA interference, conditioned reinforcement behavioral assay, electrophysiology (D2 receptor signaling)","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — brain-region-specific RNAi with behavioral and electrophysiological readouts, single lab","pmids":["26134647"],"is_preprint":false},{"year":2015,"finding":"Cisplatin treatment modulates LMO4's downstream cochlear interactome: Esr1 (estrogen receptor 1) is upregulated and Stat3 is downregulated by cisplatin in the cochlea; Trolox co-treatment attenuates these effects, and immunoblots confirm cisplatin-induced decrease in cochlear STAT3 protein is attenuated by Trolox, suggesting LMO4 loss promotes STAT3 repression in cisplatin ototoxicity.","method":"Custom gene array, RT-PCR, immunoblotting (STAT3), antioxidant rescue (Trolox co-treatment) in rats","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — gene array and immunoblot in a single animal model, indirect evidence for LMO4-STAT3 link","pmids":["25501662"],"is_preprint":false},{"year":2018,"finding":"Lmx1a and Lmo4 mutually negatively regulate each other in the inner ear: Lmo4 negatively regulates Lmx1a to allow formation of the three sensory cristae and blocks ectopic cochlear sensory formation; Lmx1a negatively regulates Lmo4 to mediate epithelial resorption of the canal pouch. Conditional knockout of Lmx1a shows the inner ear source is the major contributor to ear patterning.","method":"Conditional knockout of Lmx1a and compound mutant analysis with Lmo4; histology, in situ hybridization for otic markers","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional and compound knockouts establishing reciprocal genetic regulation with specific anatomical readouts","pmids":["29769265"],"is_preprint":false},{"year":2019,"finding":"Yeats4 recruits the Dot1l-RNA Pol II complex onto the Lmo4 promoter by recognizing H3K27ac modification, initiating Lmo4 transcription in α4β7+ CLPs; Yeats4 conditional KO decreases ILC numbers and Lmo4 expression, and Lmo4 deficiency also impairs ILC lineage differentiation.","method":"Conditional knockout, ChIP (Yeats4, Dot1l, RNA Pol II at Lmo4 promoter), H3K27ac recognition assay","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP showing epigenetic recruitment to LMO4 promoter plus conditional KO phenotype, single lab","pmids":["31434684"],"is_preprint":false},{"year":2020,"finding":"LMO4 binds the Oprk1 promoter (chromatin immunoprecipitation) in the basolateral amygdala (BLA), regulating kappa opioid receptor expression; LMO4 also controls extracellular matrix gene expression in the BLA. BLA-specific Lmo4 knockdown decreases alcohol consumption; disruption of ECM or kappa opioid receptor antagonism in the BLA reduces alcohol consumption.","method":"Lmo4 heterozygous and shRNA knockdown, RNA-seq, chromatin immunoprecipitation, pharmacological dissection (BLA infusion)","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP demonstrating LMO4 at Oprk1 promoter, RNA-seq, pharmacological validation, single lab","pmids":["32144357"],"is_preprint":false},{"year":2021,"finding":"Lmo4 deficiency enhances susceptibility to cisplatin-induced cochlear apoptosis: hair cell-specific conditional LMO4 deletion does not alter baseline cochlear morphology or hearing but significantly increases ABR thresholds after cisplatin; LMO4 deficiency impairs STAT3 activation, and this LMO4/STAT3 axis is an otoprotective cellular defense mechanism.","method":"Conditional knockout (Lmo4lox/lox; Gfi1Cre), ABR, immunostaining (phospho-STAT3, caspase-3)","journal":"Molecular neurobiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with functional hearing assay and specific STAT3 molecular readout, mechanistically linking LMO4 to STAT3-mediated otoprotection","pmids":["33411315"],"is_preprint":false},{"year":2024,"finding":"LMO4 binds JAK1 directly and potentiates STAT3 signaling in response to IL-21 in CD8+ T cells, inducing expression of stemness-related target genes (Tcf7, Socs3, Junb, Zfp36). CRISPR/Cas9 deletion of STAT3 nullifies the enhanced memory signature conferred by LMO4. LMO4 overexpression in CD8+ T cells promotes stem-like memory phenotype and antitumor immunity.","method":"CRISPR activation screen, synthetic overexpression, co-immunoprecipitation (LMO4-JAK1 interaction), CRISPR/Cas9 Stat3 deletion, syngeneic and xenograft tumor models, transcriptomics","journal":"Signal transduction and targeted therapy","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP demonstrating LMO4-JAK1 interaction, CRISPR epistasis (STAT3 KO nullifies LMO4 effect), multiple orthogonal methods, in vivo tumor models","pmids":["39117617"],"is_preprint":false},{"year":2025,"finding":"Salmonella effector SsPH2 targets LMO4 for ubiquitination and proteasome-dependent degradation: SsPH2 mediates K48-linked poly-ubiquitination of LMO4 at Lysine 29 and Lysine 67 within the LIM domains (in vivo and in vitro); SsPH2 alters the subcellular localization of LMO4, destabilizes gp130, and inhibits STAT3 activation.","method":"Yeast two-hybrid screen, GST pull-down, co-immunoprecipitation, immunofluorescence microscopy, in vitro and in vivo ubiquitination assay, lysine mutational analysis, proteasome inhibitor rescue","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro and in vivo ubiquitination assays with mutagenesis of ubiquitination sites, multiple orthogonal biochemical methods identifying K29/K67 as modification sites","pmids":["40693870"],"is_preprint":false},{"year":2025,"finding":"LMO4 promotes OSCC progression by inducing ubiquitin-proteasome-dependent degradation of the tumor suppressor RAB17, thereby promoting cancer cell proliferation, migration, and resistance to ferroptosis; restoration of RAB17 reduces these malignant behaviors and reduces in vivo tumor growth.","method":"siRNA/overexpression, ubiquitin-proteasome pathway assay, xenograft model, immunostaining for RAB17 and LMO4","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gain/loss of function with proteasome pathway assay and in vivo model, single lab, specific substrate identified","pmids":["41213908"],"is_preprint":false}],"current_model":"LMO4 is a nuclear LIM-only adaptor protein that assembles context-dependent multi-protein transcriptional complexes through its tandem LIM domains (structurally characterized by X-ray crystallography and NMR): it binds LDB1/NLI via both LIM domains (forming a modular extended interface), and recruits context-specific partners including CtIP/RBBP8, BRCA1, DEAF1, Smad proteins, SCL, Gata2, NGN2, PPARγ, JAK1, and CREB through a common binding face on LMO4; LMO4 positively regulates BMP7 and RyR2 expression by displacing HDAC2 from target promoters; it mediates calcium-dependent transcription via CaMKIV/MAPK/CREB downstream of NMDA receptor and VSCC activation; controls cell fate decisions in spinal cord V2 interneurons, cortical projection neurons, retinal interneurons, and neural crest; is required for neural tube closure, vestibular morphogenesis, and cochlear sensory restriction; is inactivated in cisplatin ototoxicity by peroxynitrite-mediated nitration at tyrosine residues within its LIM domains leading to proteasomal degradation; and in CD8+ T cells binds JAK1 to potentiate IL-21-STAT3 signaling, promoting stem-like memory cell formation."},"narrative":{"mechanistic_narrative":"LMO4 is a nuclear LIM-only adaptor protein that nucleates context-dependent multi-protein transcriptional complexes through its tandem LIM domains, governing cell fate, proliferation, and differentiation across neural, epithelial, and immune lineages [PMID:11751867, PMID:16899735, PMID:19323994]. Atomic-resolution structures establish its central architecture: LDB1/NLI binds across both LIM domains in an extended conformation, contributing a third strand to a LIM1 beta-hairpin [PMID:12727888, PMID:15343268], while context-specific partners including CtIP/RBBP8 and DEAF1 engage a common binding face on LMO4 that overlaps the LDB1 site, making partner engagement mutually competitive [PMID:23353824, PMID:25310299]. The second LIM domain is required for CtIP and BRCA1 association, within which LMO4 forms a trimeric complex that represses BRCA1-mediated transcription [PMID:11751867, PMID:12925972]. Through these modular complexes LMO4 directs binary cell-fate choices—collaborating with SCL, Gata2 and NLI to assemble a V2b interneuron enhancer complex and with NGN2/LDB1 to activate cortical neuronal differentiation genes [PMID:19323994, PMID:21652654]—and acts as a ligand-dependent PPARγ cofactor and a Snail2 cofactor driving neural crest EMT [PMID:19020036, PMID:22119055, PMID:23407937]. LMO4 regulates target genes in part by displacing HDAC2 from promoters, as shown for BMP7 [PMID:17452977], and controls calcium-dependent transcription downstream of NMDA receptors and voltage-sensitive calcium channels via CaMKIV/MAPK/CREB [PMID:16899735]. It positively regulates RyR2 to enable calcium-induced calcium release and synaptic plasticity [PMID:22442089] and is required for neural tube closure, vestibular morphogenesis, and restriction of cochlear sensory organ formation, in the latter through reciprocal antagonism with Lmx1a [PMID:14966285, PMID:15691703, PMID:19913004, PMID:25057208, PMID:29769265]. In CD8+ T cells LMO4 binds JAK1 directly to potentiate IL-21–STAT3 signaling and stem-like memory formation [PMID:39117617], and the same LMO4/STAT3 axis confers otoprotection in cochlear hair cells [PMID:33411315]. LMO4 is itself targeted for proteasomal degradation—by peroxynitrite-mediated tyrosine nitration of its LIM domains during cisplatin ototoxicity [PMID:22493493] and by K48-linked ubiquitination at K29/K67 driven by the Salmonella effector SsPH2 [PMID:40693870]. LMO4 overexpression is oncogenic in breast and oral cancers, promoting proliferation, invasion, and substrate degradation [PMID:15897450, PMID:41213908].","teleology":[{"year":1998,"claim":"Established LMO4's foundational molecular partnership by identifying it as a binding protein for the nuclear LIM interactor LDB1/NLI and for DEAF-1, defining a new LIM-interaction module.","evidence":"Yeast two-hybrid and expression-library screens with domain mapping","pmids":["9736723","9860983","9840944"],"confidence":"Medium","gaps":["No structural definition of the interaction interface yet","Functional transcriptional consequence not established","Displacement of LMO4 by LMO1/LMO2 inferred, not directly demonstrated"]},{"year":2001,"claim":"Showed LMO4 assembles a defined trimeric complex with BRCA1 and CtIP and represses BRCA1-mediated transcription, giving LMO4 its first concrete role as a transcriptional regulator and tumor-relevant adaptor.","evidence":"Yeast two-hybrid, reciprocal Co-IP, and transcription reporter assays in yeast and mammalian cells; mammary epithelial overexpression","pmids":["11751867","11734645"],"confidence":"High","gaps":["Promoters/genes directly regulated by the complex not mapped","Domain requirements for each partner not yet resolved"]},{"year":2003,"claim":"Resolved the molecular basis of LMO4 partner binding by solving the LMO4:LDB1-LID structure and mapping that the second LIM domain is required for CtIP/BRCA1 binding, converting a list of interactors into a structural model.","evidence":"NMR solution structure of LMO4:ldb1-LID; truncation-mutant binding assays; nuclear Co-IP in carcinoma cells; mammalian two-hybrid with HEN1","pmids":["12727888","12925972","12771919","12878195","12877980"],"confidence":"High","gaps":["Structure covered only LIM1:LID, not the full tandem interface","How distinct partners share or compete for surfaces unresolved"]},{"year":2004,"claim":"Defined the complete tandem LIM:LDB1 interface by crystallography and established LMO4's in vivo developmental requirement, linking the structural module to neural tube closure and a functional DEAF1 partnership.","evidence":"High-resolution X-ray crystal structure with mutagenic validation; Lmo4-null and Deaf-1-null mice with histology, BrdU, and TUNEL; phenotypic epistasis","pmids":["15343268","14966285","15691703","14966286"],"confidence":"High","gaps":["Transcriptional targets driving the neural tube phenotype not identified","Whether DEAF1 and LDB1 compete for LMO4 not yet tested structurally"]},{"year":2005,"claim":"Extended LMO4 beyond the nucleus by showing it associates with the gp130/JAK1 receptor complex and potentiates STAT3, and demonstrated its oncogenic potential in vivo, establishing roles in both cytokine signaling and breast tumorigenesis.","evidence":"Yeast two-hybrid, in vitro binding, Co-IP, siRNA, reporter assays; MMTV-Lmo4 transgenic mice, siRNA, invasion/motility assays; conditional mammary knockout with BrdU","pmids":["15677447","15897450","15856027"],"confidence":"High","gaps":["Direct vs. scaffolded nature of the gp130/JAK1 association unresolved at this stage","Mechanism coupling cytoplasmic LMO4 to nuclear transcription unclear"]},{"year":2006,"claim":"Connected LMO4 to activity-dependent and growth-factor signaling, showing it mediates calcium-dependent transcription via CaMKIV/MAPK/CREB and integrates TGFβ/Smad and LKB1/GATA inputs.","evidence":"Calcium-stimulated reporter assays, pharmacological inhibitors, Co-IP, conditional cortical knockout with barrel-field histology; Smad Co-IP/ChIP; LKB1 complex Co-IP and p21 reporter","pmids":["16899735","16331278","16580634"],"confidence":"High","gaps":["Direct DNA contacts of LMO4-containing complexes not defined","How calcium signaling alters LMO4 complex composition unknown"]},{"year":2007,"claim":"Defined a chromatin mechanism for LMO4-mediated gene activation—displacement of HDAC2 from target promoters—and tied LMO4 to ATP/HuD-dependent post-transcriptional regulation in neuronal survival.","evidence":"ChIP of LMO4/Clim2/HDAC2 at BMP7 promoter, microarray, reporter, siRNA; 3'UTR reporter and RNA-binding-protein assays for HuD/CUGBP1","pmids":["17452977","17524392","17418808"],"confidence":"High","gaps":["Whether HDAC displacement is a general LMO4 mechanism beyond BMP7 untested","Direct vs. indirect recruitment to promoters not fully resolved"]},{"year":2008,"claim":"Established LMO4 as a cell-fate and morphogenesis regulator across tissues—genetically with GRHL3 in epidermal differentiation/neural tube closure and as an essential ligand-dependent PPARγ cofactor in neuronal ischemia protection.","evidence":"Compound Grhl3/Lmo4 and Get-1/Lmo4 knockouts with EM, phospho-ERK staining, scratch assays; PPARγ Co-IP, mammalian two-hybrid, conditional KO, focal ischemia, SOD2 reporter, pharmacological rescue","pmids":["18619436","16949565","19020036"],"confidence":"High","gaps":["Direct biochemical interface for the GRHL3 interaction not structurally mapped","How LMO4 selects PPARγ versus other partners in vivo unknown"]},{"year":2009,"claim":"Demonstrated that LMO4 nucleates distinct LIM-complexes to make binary cell-fate decisions, switching V2 spinal interneurons toward an inhibitory fate via an SCL/Gata2/NLI complex, and linked LMO4 to cell-cycle-coupled proliferation in cancer.","evidence":"Conditional and compound (LMO4;SCL) mutants, enhancer reporters, Co-IP; ErbB2/PI3K profiling, siRNA, FACS cell-cycle analysis with cullin-3/cyclin readouts","pmids":["19323994","19648968"],"confidence":"High","gaps":["How partner availability determines which complex LMO4 forms in a given cell unresolved","Mechanism linking LMO4 to cullin-3 oscillation not defined"]},{"year":2011,"claim":"Generalized LMO4's co-activator logic by showing it bridges NLI/LDB1 to the bHLH factor NGN2 for cortical neuronal differentiation and serves as an essential Snail/Slug cofactor for neural crest induction.","evidence":"Co-IP of LMO4-NLI-NGN2 trimer, ChIP at E-box enhancers, Lmo4-null embryos, in utero electroporation migration assay; Xenopus morpholino knockdown, misexpression, Slug/Snail binding; ERα/Alk ChIP","pmids":["21652654","22119055","21976498"],"confidence":"High","gaps":["Whether the same LMO4 surface engages bHLH partners as engages LDB1 not structurally shown here","Direct vs. complex-mediated contact with Snail2 unresolved"]},{"year":2012,"claim":"Defined LMO4 control of neuronal calcium handling (RyR2/CICR) and synaptic plasticity, mapped its regulation of DEAF1 nuclear export, and identified the first post-translational off-switch—tyrosine nitration during cisplatin ototoxicity driving its loss.","evidence":"Conditional forebrain KO with electrophysiology, two-photon imaging, single-cell rescue, Morris water maze; NES localization assays; MALDI-TOF identification of LMO4 nitration with reciprocal IP and co-localization; p53 Co-IP","pmids":["22442089","22723967","22493493","22906635"],"confidence":"High","gaps":["How RyR2 transcription is mechanistically activated by LMO4 not detailed","Which nitrated tyrosines drive degradation and the responsible E3 not identified at this stage"]},{"year":2013,"claim":"Resolved the competitive-binding principle underlying LMO4 partner selection (CtIP and LDB1 share one face) and confirmed LMO4 as an essential cofactor for Snail2-driven EMT and cadherin repression.","evidence":"NMR structure of LMO4:CtIP/RBBP8 with competition assays; siRNA/shRNA knockdown, invasion and chick neural crest delamination assays, cadherin analysis; HBXIP/Sp1 promoter activation by ChIP/EMSA","pmids":["23353824","23407937","23291272"],"confidence":"High","gaps":["In vivo determinants of which competing partner wins not established","Direct LMO4 contact with Snail2 versus scaffolded interaction unresolved"]},{"year":2014,"claim":"Broadened LMO4's competitive-surface model to DEAF1 (disorder-to-order on a shared face) and detailed its tissue-specific roles in retinal interneuron specification, cochlear sensory restriction, and hypothalamic control of Ca2+ channels, excitability, feeding, and insulin signaling.","evidence":"NMR of LMO4-LIM2:DEAF1 with mutagenesis; conditional KOs in retina (ERG), cochlea (ectopic organ of Corti), PVH and glutamatergic neurons with electrophysiology, RT-PCR of Ca2+ channels, DREADD and PTP1B-inhibitor rescue","pmids":["25310299","20949055","25057208","24381275","24937445"],"confidence":"High","gaps":["Direct transcriptional targets in each tissue largely unmapped","How a single competitive surface accommodates so many tissue partners unresolved"]},{"year":2015,"claim":"Established the LMO4/STAT3 axis as an otoprotective survival pathway, showing LMO4 deficiency compromises STAT3 phosphorylation and increases hair-cell apoptosis after cisplatin, and defined behavioral roles in cue-reward learning.","evidence":"Hair-cell-specific conditional KO with ABR and phospho-STAT3/caspase-3 staining; BLA-specific RNAi with conditioned-reinforcement and D2 electrophysiology; cisplatin cochlear gene array with Trolox rescue","pmids":["33411315","26134647","25501662"],"confidence":"High","gaps":["Mechanism by which LMO4 supports STAT3 phosphorylation in cochlea not fully defined","The cochlear array link to LMO4 is correlative (Low confidence)"]},{"year":2018,"claim":"Defined reciprocal genetic antagonism between Lmo4 and Lmx1a as the switch patterning inner-ear sensory versus non-sensory fate, refining LMO4's role as a negative regulator of ectopic sensory organ formation.","evidence":"Conditional and compound Lmx1a/Lmo4 knockouts with histology and otic-marker in situ hybridization","pmids":["29769265"],"confidence":"High","gaps":["Molecular mechanism by which each gene represses the other unknown","Whether the antagonism is transcriptional or post-translational unresolved"]},{"year":2019,"claim":"Showed how Lmo4 transcription is itself epigenetically initiated—via Yeats4/Dot1l/RNA Pol II recruitment to its H3K27ac-marked promoter—and placed LMO4 in innate lymphoid cell lineage differentiation.","evidence":"Conditional Yeats4 KO, ChIP of Yeats4/Dot1l/RNA Pol II at the Lmo4 promoter, H3K27ac recognition assays, ILC phenotyping","pmids":["31434684"],"confidence":"Medium","gaps":["Direct LMO4 targets driving ILC differentiation not identified","Single-lab finding without orthogonal upstream confirmation"]},{"year":2024,"claim":"Defined a direct cytoplasmic signaling mechanism: LMO4 binds JAK1 to potentiate IL-21–STAT3 signaling and drive stem-like CD8+ T-cell memory, with STAT3 deletion nullifying the effect—establishing LMO4 as a STAT3-pathway amplifier with antitumor immune relevance.","evidence":"CRISPR-activation screen, overexpression, LMO4-JAK1 Co-IP, CRISPR/Cas9 Stat3 deletion epistasis, syngeneic and xenograft tumor models, transcriptomics","pmids":["39117617"],"confidence":"High","gaps":["Whether LMO4-JAK1 binding is direct via LIM domains not structurally mapped","Generality of the JAK1/STAT3 axis beyond CD8+ T cells untested here"]},{"year":2025,"claim":"Identified the degradative control points and an oncogenic substrate of LMO4: the Salmonella effector SsPH2 drives K48-linked ubiquitination at K29/K67 in the LIM domains to suppress gp130/STAT3, while LMO4 itself promotes proteasomal degradation of the tumor suppressor RAB17 in oral cancer.","evidence":"Yeast two-hybrid, GST pull-down, in vitro/in vivo ubiquitination with lysine mutagenesis, proteasome-inhibitor rescue; siRNA/overexpression with ubiquitin-proteasome assay and OSCC xenografts","pmids":["40693870","41213908"],"confidence":"High","gaps":["The endogenous host E3 ligase regulating LMO4 turnover not identified","Mechanism by which LMO4 directs RAB17 degradation (adaptor vs. ligase recruitment) unresolved"]},{"year":null,"claim":"How LMO4 selects among its many mutually competitive partners in a given cell—and the upstream signals and host E3 ligases that tune its abundance to switch complex composition—remains the central open question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No cell-type-resolved map of which competing partner occupies LMO4 in vivo","Endogenous regulators of LMO4 stability beyond pathogen effectors and nitration unknown","No structure of LMO4 bound to its bHLH (NGN2/SCL) or JAK1 partners"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[3,15,18,24,25,27]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,10,25,27,36,38]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[18,24,49]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,6,15,22]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[22,49]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,15,18,25,27]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[11,21,25,27,28,39]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[15,16,22,24,49]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[46,49]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[32,50,51]}],"complexes":["LMO4-LDB1/NLI complex","LMO4-BRCA1-CtIP complex","LMO4-SCL-Gata2-NLI V2b complex","LMO4-NLI-NGN2 complex"],"partners":["LDB1","CTIP/RBBP8","BRCA1","DEAF1","NGN2","PPARG","JAK1","CREB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P61968","full_name":"LIM domain transcription factor LMO4","aliases":["Breast tumor autoantigen","LIM domain only protein 4","LMO-4"],"length_aa":165,"mass_kda":18.0,"function":"Transcription cofactor. Plays a role in establishing motor neuron identity, in concert with MNX1, acting, at least in part, to disrupt LDB1-LHX3 complexes thereby negatively modulating interneuron genes in motor neurons","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P61968/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LMO4","classification":"Not Classified","n_dependent_lines":18,"n_total_lines":1208,"dependency_fraction":0.014900662251655629},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LMO4","total_profiled":1310},"omim":[{"mim_id":"616792","title":"NEUROBLASTOMA, SUSCEPTIBILITY TO, 7; NBLST7","url":"https://www.omim.org/entry/616792"},{"mim_id":"604124","title":"RETINOBLASTOMA-BINDING PROTEIN 8; RBBP8","url":"https://www.omim.org/entry/604124"},{"mim_id":"603451","title":"LIM DOMAIN-BINDING 1; LDB1","url":"https://www.omim.org/entry/603451"},{"mim_id":"603129","title":"LIM DOMAIN ONLY 4; LMO4","url":"https://www.omim.org/entry/603129"},{"mim_id":"300379","title":"RING FINGER PROTEIN, LIM DOMAIN-INTERACTING; RLIM","url":"https://www.omim.org/entry/300379"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Midbody ring","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":239.5}],"url":"https://www.proteinatlas.org/search/LMO4"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P61968","domains":[{"cath_id":"2.10.110.10","chopping":"35-79","consensus_level":"medium","plddt":96.1704,"start":35,"end":79},{"cath_id":"2.10.110.10","chopping":"84-148","consensus_level":"high","plddt":93.364,"start":84,"end":148}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P61968","model_url":"https://alphafold.ebi.ac.uk/files/AF-P61968-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P61968-F1-predicted_aligned_error_v6.png","plddt_mean":85.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LMO4","jax_strain_url":"https://www.jax.org/strain/search?query=LMO4"},"sequence":{"accession":"P61968","fasta_url":"https://rest.uniprot.org/uniprotkb/P61968.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P61968/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P61968"}},"corpus_meta":[{"pmid":"16949565","id":"PMC_16949565","title":"The 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molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/23353824","citation_count":9,"is_preprint":false},{"pmid":"37552690","id":"PMC_37552690","title":"Lmo4 synergizes with Fezf2 to promote direct in vivo reprogramming of upper layer cortical neurons and cortical glia towards deep-layer neuron identities.","date":"2023","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/37552690","citation_count":8,"is_preprint":false},{"pmid":"26134647","id":"PMC_26134647","title":"A Selective Role for Lmo4 in Cue-Reward Learning.","date":"2015","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/26134647","citation_count":7,"is_preprint":false},{"pmid":"26579872","id":"PMC_26579872","title":"Lmo4 and Other LIM domain only factors are necessary and sufficient for multiple retinal cell type development.","date":"2015","source":"Developmental 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regulation by Fgf8 and Pou2 of the zebrafish LIM-only gene, lmo4.","date":"2002","source":"Gene expression patterns : GEP","url":"https://pubmed.ncbi.nlm.nih.gov/12617802","citation_count":3,"is_preprint":false},{"pmid":"40693870","id":"PMC_40693870","title":"The Type III Secretion Effector SsPH2 of Salmonella enterica Targets LMO4 for Ubiquitination and Degradation.","date":"2025","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/40693870","citation_count":2,"is_preprint":false},{"pmid":"41503443","id":"PMC_41503443","title":"miR-143-3p mediates mercury chloride-induced neurotoxicity by targeting LMO4 and the Akt/GSK3β/mTOR pathway in vitro.","date":"2025","source":"Toxicological research","url":"https://pubmed.ncbi.nlm.nih.gov/41503443","citation_count":2,"is_preprint":false},{"pmid":"33906487","id":"PMC_33906487","title":"Research and Clinical Significance of the Differentially Expressed Genes TP63 and LMO4 in Human Immunodeficiency Virus-Related Penile Squamous Cell Carcinoma.","date":"2021","source":"American journal of men's health","url":"https://pubmed.ncbi.nlm.nih.gov/33906487","citation_count":1,"is_preprint":false},{"pmid":"39859578","id":"PMC_39859578","title":"The Protective Effect of Nimodipine in Schwann Cells Is Related to the Upregulation of LMO4 and SERCA3 Accompanied by the Fine-Tuning of Intracellular Calcium Levels.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39859578","citation_count":1,"is_preprint":false},{"pmid":"41213908","id":"PMC_41213908","title":"LMO4 promotes OSCC progression by inducing RAB17 degradation and ferroptosis resistance.","date":"2025","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/41213908","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48157,"output_tokens":12870,"usd":0.168761,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":24457,"output_tokens":7272,"usd":0.152042,"stage2_stop_reason":"end_turn"},"total_usd":0.320803,"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\": 1998,\n      \"finding\": \"LMO4 was identified as a binding partner of LDB1/NLI1 via yeast two-hybrid screening; nuclear retention of LMO proteins is enhanced by the nuclear LIM interactor (NLI/LDB1).\",\n      \"method\": \"Yeast two-hybrid screen, in situ hybridization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid identification replicated across multiple independent labs in 1998\",\n      \"pmids\": [\"9736723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LMO4 interacts strongly with CLIM/LDB coregulators via its LIM domain, and interacts with mouse DEAF-1 (DEFORMED EPIDERMAL AUTOREGULATORY FACTOR 1) through a proline-rich C-terminal domain of DEAF-1, defining a novel LIM-interacting domain distinct from HLH and GATA domains.\",\n      \"method\": \"Expression library screen using CLIM LIM-interaction domain as bait; yeast two-hybrid; domain mapping\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus domain mapping, replicated across labs\",\n      \"pmids\": [\"9860983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"LMO4 interacts with LDB1/NLI1, and enforced LMO1/LMO2 expression may displace LMO4 from its complex with LDB1 in T cell development.\",\n      \"method\": \"Yeast two-hybrid identification of LMO4 via LDB1 interaction\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single yeast two-hybrid identification, displacement is inferred not directly demonstrated\",\n      \"pmids\": [\"9840944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LMO4 interacts with the cofactor CtIP and with the BRCA1 tumor suppressor (via BRCA1's C-terminal BRCT domains); a stable trimeric complex of LMO4, BRCA1, and CtIP was demonstrated in vivo, and LDB1 also participates. LMO4 represses BRCA1-mediated transcriptional activation in both yeast and mammalian cells.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation (in vivo complex), functional transcription reporter assays in yeast and mammalian cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP demonstrating in vivo complex, functional transcription assay in two cell systems, multiple orthogonal methods\",\n      \"pmids\": [\"11751867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Forced expression of LMO4 inhibited differentiation of mammary epithelial cells in vitro, consistent with a role in maintaining proliferation.\",\n      \"method\": \"Forced expression/overexpression in mammary epithelial cells, differentiation 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 — loss-of-function/gain-of-function with defined cellular phenotype, single lab\",\n      \"pmids\": [\"11734645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"NMR solution structures of LMO2-LIM1:ldb1-LID and LMO4-LIM1:ldb1-LID complexes show that ldb1-LID binds to the N-terminal LIM domain of LMO4 in an extended conformation, contributing a third strand to a beta-hairpin in LIM1 domains, providing the first molecular definition of LIM-mediated protein-protein interactions.\",\n      \"method\": \"NMR solution structure determination (PDB: 1M3V and 1J2O)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution NMR structures of both LMO2 and LMO4 complexes with ldb1, mechanistically defining the LIM:LID interaction\",\n      \"pmids\": [\"12727888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LMO4 immunoprecipitates with LDB1 in the nuclear fraction of oral carcinoma cells, confirming formation of an LMO4-LDB1 transcription complex in vivo.\",\n      \"method\": \"Co-immunoprecipitation from nuclear fractions of carcinoma cells\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP in cancer cell lines, no functional follow-up\",\n      \"pmids\": [\"12771919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LMO4 modulates the transcriptional activity of the bHLH protein HEN1: LMO4 interacts with HEN1 (by mammalian two-hybrid), and LMO4 but not LMO2 augments HEN1-mediated repression of E47 transcription. Overexpression of LMO4 in hippocampal precursor cells prevents HEN1-induced neurite extension.\",\n      \"method\": \"Mammalian two-hybrid assay, reporter gene assays, overexpression in hippocampal precursor cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — mammalian two-hybrid plus functional reporter assay plus cell-based phenotype, single lab\",\n      \"pmids\": [\"12878195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Overexpression of LMO4 (sense orientation) reduces neurite number and length in SH-SY5Y neuroblastoma cells, while antisense LMO4 promotes neuritogenesis; LMO4-dependent neuritic effects correlate with altered phosphorylation of cytoskeletal proteins.\",\n      \"method\": \"Stable transfection of sense/antisense LMO4 cDNA, morphometric analysis, phosphorylation analysis\",\n      \"journal\": \"Brain research. Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — bidirectional gain/loss of function with defined cellular phenotype and molecular correlate, single lab\",\n      \"pmids\": [\"12877980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A truncating somatic mutation in LMO4 (frameshift at exon 2) generates a LIM1-only mutant that retains LDB1 binding but loses CtIP and BRCA1 association, demonstrating the second LIM domain is required for CtIP/BRCA1 interaction.\",\n      \"method\": \"Mutation analysis, binding assays comparing wild-type vs. mutant LMO4\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — natural truncation mutant defines domain requirements for binding partners, functional binding assays\",\n      \"pmids\": [\"12925972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"X-ray crystal structure of LMO4 in complex with LDB1-LID (the FLINC4 complex) at high resolution reveals a highly modular structure with Ldb1-LID binding in an extended manner across both LIM domains of LMO4, with extensive hydrophobic and electrostatic interactions. Mutagenic screening of Ldb1-LID (yeast two-hybrid and competition ELISA) identified key interface residues.\",\n      \"method\": \"X-ray crystallography (high-resolution crystal structure), mutagenic screen assessed by yeast two-hybrid and competition ELISA\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenic validation, multiple orthogonal methods, mechanistically defines tandem LIM:Ldb1 interface\",\n      \"pmids\": [\"15343268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Lmo4-null mice die perinatally and show severe neural tube defect (exencephaly/anencephaly); conditional null demonstrates LMO4 is required for proper closure of the anterior neural tube, with loss causing abnormal cell proliferation and elevated apoptosis in the neuroepithelium. LMO4 is expressed in neuroepithelial cells and Schwann cell progenitors.\",\n      \"method\": \"Gene targeting (null mutation), histology, BrdU proliferation assay, TUNEL apoptosis assay\",\n      \"journal\": \"Molecular and cellular biology / Molecular and cellular neurosciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independently replicated null mouse phenotype across two labs (PMID 14966285 and 15691703), specific cellular readouts\",\n      \"pmids\": [\"14966285\", \"15691703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The transcription factor Deaf-1/NUDR is a binding partner of LMO4 in vivo; Deaf-1 knockout mice share overlapping phenotypes with Lmo4 knockouts (exencephaly, vertebral homeotic transformations), indicating they act in a functional complex.\",\n      \"method\": \"Gene targeting of both Lmo4 and Deaf-1 in mice, phenotypic comparison (genetic epistasis)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — parallel knockout phenotypes in two genes provide strong epistatic evidence for functional complex in vivo\",\n      \"pmids\": [\"14966286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"LMO4 overexpression in the mouse mammary gland (MMTV-Lmo4 transgene) elicits hyperplasia and mammary intraepithelial neoplasia; siRNA knockdown of LMO4 reduces proliferation of breast cancer cells and increases differentiation of mammary epithelial cells; LMO4 overexpression in MCF10A cells promotes cell motility and invasion of extracellular matrix.\",\n      \"method\": \"Transgenic mouse model (MMTV-Lmo4), siRNA knockdown, Matrigel invasion assay, cell motility assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal approaches (transgenic, RNAi, gain-of-function in non-invasive cells) with specific cellular phenotypes\",\n      \"pmids\": [\"15897450\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Conditional deletion of Lmo4 in mammary epithelium during pregnancy impairs lobuloalveolar development with a 2-fold reduction in BrdU-positive proliferating cells, demonstrating LMO4 is a positive regulator of alveolar epithelial proliferation.\",\n      \"method\": \"Conditional knockout (Cre-lox), BrdU incorporation, mammary gland histology\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with specific quantitative cellular phenotype (BrdU), single lab but rigorous\",\n      \"pmids\": [\"15856027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LMO4 mediates calcium-dependent transcription in cortical neurons: calcium influx via VSCCs and NMDA receptors activates LMO4-mediated transactivation via CaM kinase IV and MAP kinase. LMO4 forms a complex with CREB, CLIM1, and CLIM2 (by co-immunoprecipitation). Conditional cortical deletion of Lmo4 disrupts barrel field segregation of thalamocortical afferents in somatosensory cortex.\",\n      \"method\": \"Luciferase reporter assay (calcium stimulation), pharmacological inhibitors, co-immunoprecipitation, conditional Cre-lox knockout, barrel field histology\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (reporter assay, Co-IP, conditional KO with specific circuit phenotype) in one study\",\n      \"pmids\": [\"16899735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LMO4 interacts with the MH1 and linker domains of receptor-mediated Smad proteins and associates with the endogenous TGFβ-responsive PAI-1 gene promoter in a TGFβ-dependent manner; LMO4 modulates TGFβ signaling in epithelial cells and potentiates growth-inhibitory effects of TGFβ.\",\n      \"method\": \"Co-immunoprecipitation (LMO4-Smad interaction), chromatin immunoprecipitation (LMO4 at PAI-1 promoter), TGFβ-responsive reporter gene assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ChIP, and reporter assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"16331278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Get-1/Grhl3 and LMO4 interact functionally (genetically) in epidermal terminal differentiation: double knockout of Get-1 and LMO4 causes more severe stratum corneum defects than Get-1 single knockout alone.\",\n      \"method\": \"Compound knockout mouse model (Get-1−/−; LMO4−/−), epidermal barrier assays, histology\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in compound knockout, specific epidermal phenotype, single lab\",\n      \"pmids\": [\"16949565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LMO4 regulates expression of BMP7 by a mechanism involving displacement of HDAC2 from the BMP7 promoter: LMO4 and its cofactor Clim2 are recruited to the BMP7 promoter (ChIP), HDAC2 recruitment is inhibited by LMO4 upregulation, and HDAC2 knockdown upregulates the promoter. Inhibition of BMP7 partially blocks LMO4-mediated effects on apoptosis.\",\n      \"method\": \"DNA microarray, promoter-reporter assay, chromatin immunoprecipitation (LMO4, Clim2, HDAC2 at BMP7 promoter), siRNA knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP demonstrating LMO4 and HDAC2 at BMP7 promoter, promoter reporter, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"17452977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"LMO4 is a downstream effector of ATP signaling that promotes neuron survival from hypoxia; extracellular ATP stabilizes LMO4 mRNA via the ARE1 element in the 3'UTR by increasing HuD protein binding, while CUGBP1 binds sequences flanking ARE2 and is destabilized by ATP. ERK and CREB activation by ATP increases LMO4 promoter activity and LMO4 protein stability.\",\n      \"method\": \"siRNA knockdown, luciferase 3'UTR reporter, RNA-binding protein assays (HuD/CUGBP1), primary LMO4-null neurons\",\n      \"journal\": \"Experimental cell research / Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (3'UTR reporter, RNA-binding assay, null neuron rescue), single lab\",\n      \"pmids\": [\"17524392\", \"17418808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"GRHL3 and LMO4 interact biochemically and genetically; compound Grhl3/Lmo4 null mice show fully penetrant exencephaly, spina bifida, and eyes-open-at-birth phenotype not seen in individual nulls. ERK1/2 phosphorylation is lost in the epidermis of double-null embryos, actin cable formation is absent at eyelid margins, and keratinocytes from double-null mice fail to heal in scratch assays.\",\n      \"method\": \"Compound knockout mouse model, biochemical interaction assay, electron microscopy, phospho-ERK immunostaining, in vitro scratch assay\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound genetic knockout, biochemical interaction, multiple orthogonal phenotypic and molecular readouts\",\n      \"pmids\": [\"18619436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"LMO4 is required for vestibular morphogenesis: Lmo4-null mice lack all three semicircular canals and anterior/posterior cristae; canal outpouches fail to form and cell proliferation is reduced in the dorsolateral otocyst. LMO4 controls expression of Bmp4, Fgf10, Msx1, Isl1, Gata3, and Dlx5 in the dorsolateral otocyst.\",\n      \"method\": \"Gene targeting (null mutation), BrdU proliferation assay, in situ hybridization for otic markers\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — null mouse with specific morphogenetic and molecular phenotypes, multiple markers analyzed\",\n      \"pmids\": [\"19913004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"LMO4 associates with gp130 and JAK1 in mammalian cells; it also interacts with SHP2 and SOCS3, and exists in the gp130 IL-6 receptor complex. LMO4 overexpression enhances STAT3 transcriptional activity and target gene expression, while LMO4 siRNA knockdown decreases STAT3 activity. LMO4 is detected both in the nucleus and cytoplasm.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro binding assays, co-immunoprecipitation, siRNA stable knockdown, reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus in vitro binding plus Co-IP plus functional assay, single lab\",\n      \"pmids\": [\"15677447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LKB1 forms a complex with LMO4, GATA-6, and Ldb1, enhancing GATA-mediated transactivation in a kinase-dependent manner; this complex induces p21 expression via a p53-independent mechanism.\",\n      \"method\": \"Co-immunoprecipitation (complex formation), reporter gene assay (GATA-mediated transactivation, p21 promoter), kinase-dead mutant\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP and reporter assay, single lab, two orthogonal methods\",\n      \"pmids\": [\"16580634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PPARγ signaling requires LMO4 as an essential cofactor to protect neurons from ischemic injury: LMO4 interacts with PPARγ in a ligand-dependent manner (co-immunoprecipitation, mammalian two-hybrid), promotes RXRα binding to PPARγ, increases PPARγ binding to target DNA, and activates SOD2 promoter. PPARγ agonist failed to reduce cerebral infarction in neuron-specific LMO4-null mice.\",\n      \"method\": \"Co-immunoprecipitation, mammalian two-hybrid, LMO4-null cortical neurons, conditional forebrain knockout (CaMKIIα-Cre/LMO4loxP), focal ischemia model, promoter reporter assay, MnTBAP rescue\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, two-hybrid, conditional KO in vivo, pharmacological rescue), mechanistically defines LMO4 as PPARγ cofactor\",\n      \"pmids\": [\"19020036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LMO4 controls the binary fate choice between excitatory V2a and inhibitory V2b spinal interneurons by regulating LIM complexes: LMO4 induces GABAergic V2b interneurons in collaboration with SCL and inhibits Lhx3 from generating glutamatergic V2a interneurons. LMO4 nucleates assembly of a novel LIM-complex containing SCL, Gata2, and NLI, which activates V2b-specific enhancers. In LMO4;SCL compound mutants, V2a cells increase at the expense of V2b cells.\",\n      \"method\": \"Conditional knockout, compound mutant (LMO4;SCL), enhancer reporter assay, co-immunoprecipitation (complex assembly), in situ hybridization for V2a/V2b markers\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — compound genetic epistasis, Co-IP showing novel complex, reporter assay for enhancer activation, multiple orthogonal methods\",\n      \"pmids\": [\"19323994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"LMO4 is a downstream target of ErbB2 and PI3K signaling in breast cancer cells; LMO4 silencing causes G2/M arrest associated with decreased cullin-3 (E3 ubiquitin ligase component), followed by reductions in Cyclin D1 and Cyclin E. LMO4 expression oscillates through the cell cycle with maximum at G2/M, preceding cullin-3 oscillations.\",\n      \"method\": \"Gene expression profiling, siRNA knockdown, cell cycle analysis (FACS), immunoblotting, PI3K inhibitor treatment\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown with multiple specific molecular readouts (cell cycle, cullin-3, cyclins), single lab\",\n      \"pmids\": [\"19648968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LMO4 functions as a co-activator of Neurogenin 2 (NGN2) in the developing cortex: LMO4 and NLI/LDB1 interact with NGN2 simultaneously, forming a multi-protein transcription complex recruited to E-box-containing enhancers of NGN2-target genes. Loss of LMO4 in Lmo4-null embryos impairs neuronal differentiation, and LMO4 expression facilitates NGN2-mediated radial migration of cortical neurons.\",\n      \"method\": \"Co-immunoprecipitation (LMO4-NLI-NGN2 complex), chromatin immunoprecipitation (complex at NGN2-target enhancers), Lmo4-null embryo analysis, in utero electroporation (migration assay)\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP showing trimeric complex, ChIP, in vivo null phenotype, and functional migration assay; multiple orthogonal methods\",\n      \"pmids\": [\"21652654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LMO4 is a Slug/Snail interacting protein (direct binding demonstrated); LMO4 morpholino knockdown in Xenopus causes loss of neural crest precursor formation, and misexpression of LMO4 modulates Slug-mediated neural crest induction, indicating LMO4 is an essential cofactor in Snail2-mediated neural crest development.\",\n      \"method\": \"Morpholino knockdown (Xenopus), misexpression, co-immunoprecipitation/direct binding assay for LMO4-Slug/Snail interaction\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assay plus in vivo loss-of-function with specific NC phenotype, Xenopus model, single lab\",\n      \"pmids\": [\"22119055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LMO4 is repressed by Alk transcription in the striatum; LMO4 and ERα are associated with the Alk promoter (chromatin immunoprecipitation), and Alk is an estrogen-responsive gene modulated by LMO4 in the striatum. ERα knockout mice show enhanced cocaine sensitization and increased Alk expression.\",\n      \"method\": \"Chromatin immunoprecipitation (LMO4 and ERα at Alk promoter), ERα knockout, RNA interference in striatum\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP showing LMO4/ERα at Alk promoter, genetic knockout with specific behavioral and molecular readout, single lab\",\n      \"pmids\": [\"21976498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LMO4 positively regulates ryanodine receptor type 2 (RyR2) expression; forebrain-specific LMO4 knockout neurons have severely compromised calcium-induced calcium release (CICR) modulation of afterhyperpolarization (rescued by single-cell LMO4 overexpression), absent caffeine-potentiated RyR-mediated calcium release, defective CICR-facilitated glutamate release, and reduced CA3-CA1 LTP.\",\n      \"method\": \"Conditional forebrain knockout, electrophysiology (patch clamp), two-photon calcium imaging, single-cell overexpression rescue, Morris water maze\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with electrophysiology, two-photon imaging, and single-cell rescue; multiple orthogonal methods mechanistically linking LMO4 to RyR2 and CICR\",\n      \"pmids\": [\"22442089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LMO4 interacts with p53 (co-immunoprecipitation) and inhibits p53-mediated suppression of breast cancer cell colony formation; p53 induction by adriamycin represses LMO4 expression, indicating LMO4 is a transcriptional target of p53.\",\n      \"method\": \"Co-immunoprecipitation, colony formation assay, RT-PCR/Western blot after ADR treatment\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP with partial functional follow-up, single lab\",\n      \"pmids\": [\"22906635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LMO4 nitration at tyrosine residues in the cochlea is the primary molecular event in cisplatin-induced ototoxicity: cisplatin induces nitroxidative protein modification and nitration of LMO4 (identified by MALDI-TOF mass spectrometry, confirmed by reciprocal immunoprecipitation and immunoblotting), leading to decreased cochlear LMO4 levels and cochlear apoptosis.\",\n      \"method\": \"MALDI-TOF mass spectrometry, reciprocal co-immunoprecipitation/immunoblotting, immunofluorescence co-localization of nitrotyrosine and LMO4, in vitro nitration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry identification of nitration confirmed by orthogonal Co-IP/immunoblot and co-localization; mechanistically defines cisplatin-induced post-translational modification of LMO4\",\n      \"pmids\": [\"22493493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LMO4 is required for normal DEAF1 nuclear export: LMO4 modulates the activity of the DEAF1 nuclear export signal (NES) within a coiled-coil domain, causing nuclear accumulation of constructs containing the LMO4-interaction region of DEAF1. The specific LMO4-binding domain in DEAF1 contains an unstructured region that directly contacts LMO4.\",\n      \"method\": \"Yeast two-hybrid domain mapping, cell-based NES activity assay, co-expression/localization\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — cell-based localization assay with domain mapping showing functional consequence of LMO4:DEAF1 interaction, single lab\",\n      \"pmids\": [\"22723967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LMO4 is an essential cofactor in Snail2-mediated epithelial-to-mesenchymal transition and cadherin repression in neuroblastoma and neural crest cells; LMO4 knockdown impairs neuroblastoma cell invasion and neural crest delamination, and LMO4 is required for Snail2-mediated cadherin downregulation.\",\n      \"method\": \"siRNA/shRNA knockdown, invasion assay, in vivo chick neural crest delamination assay, cadherin expression analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in two model systems (neuroblastoma, chick NC) with specific molecular (cadherin) and cellular (invasion/delamination) readouts, single lab\",\n      \"pmids\": [\"23407937\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HBXIP activates LMO4 transcription by binding to the LMO4 promoter through the transcription factor Sp1 at the −237/−206 region; HBXIP co-immunoprecipitates with Sp1, ChIP shows HBXIP at the LMO4 promoter, and mutation of the Sp1 site abolishes HBXIP-LMO4 promoter interaction.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, electrophoretic mobility shift assay, luciferase reporter, Sp1-binding site mutagenesis\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, EMSA, and mutagenesis demonstrating HBXIP/Sp1-dependent LMO4 promoter activation, single lab\",\n      \"pmids\": [\"23291272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The solution NMR structure of LMO4 in complex with CtIP/RBBP8 reveals that CtIP and LDB1 bind to the same face on LMO4 and cannot simultaneously bind LMO4, suggesting competitive binding between these two partners.\",\n      \"method\": \"NMR solution structure determination, competition binding assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic-resolution NMR structure defining binding interface and competitive binding mechanism\",\n      \"pmids\": [\"23353824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss of LMO4 in retinal progenitor cells leads to fewer Bhlhb5-positive GABAergic amacrine and OFF-cone bipolar cells (affecting the postnatal wave), with functional deficit shown by reduced b-wave amplitude on electroretinography; cholinergic/dopaminergic amacrine, rod bipolar, and photoreceptor cell numbers are not affected.\",\n      \"method\": \"Conditional knockout (Pax6α-Cre/LMO4flox), cell counting by immunostaining, electroretinography\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockout with cell-type specific immunostaining and functional ERG readout, selective phenotype\",\n      \"pmids\": [\"20949055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The NMR solution structure of the LMO4-LIM2/DEAF1 complex shows that DEAF1's intrinsically disordered LMO4-binding domain becomes structured upon binding LMO4, and DEAF1 binds the same face on LMO4 as LDB1 and CtIP; mutagenic screening identified key residues in LMO4-LIM2 and the N-terminal half of DEAF1's binding domain.\",\n      \"method\": \"NMR solution structure, yeast two-hybrid mutagenic screening, domain mapping\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with mutagenic validation defining competitive binding surface on LMO4\",\n      \"pmids\": [\"25310299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LMO4 inactivation in the cochlea causes ectopic formation of an organ of Corti (eOC) in the lateral cochlea with inner/outer hair cells and supporting cells but in mirror-image orientation, demonstrating LMO4 is a negative regulator of sensory organ formation in the cochlea.\",\n      \"method\": \"Conditional knockout (Lmo4 inactivation), histology, hair cell markers (immunostaining)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with highly specific ectopic organ phenotype, detailed cellular characterization\",\n      \"pmids\": [\"25057208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LMO4 regulates the expression of Ca2+ channel subunits Cacna1h and Cacna1e in PVH neurons; PVH-specific LMO4 ablation reduces voltage-activated Ca2+ currents and basal neuronal excitability, leading to hyperphagia. Restoring neuronal activity by DREADD technology suppresses food intake in these mice.\",\n      \"method\": \"Conditional (PVH-specific) knockout, brain slice electrophysiology (patch clamp for Ca2+ currents), real-time PCR for Ca2+ channel expression, DREADD designer receptor\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with electrophysiological measurement of Ca2+ currents, molecular target identification (RT-PCR), and pharmacogenetic rescue\",\n      \"pmids\": [\"24381275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss of LMO4 in hypothalamic glutamatergic neurons impairs insulin signaling in the hypothalamus and peripheral tissues (liver, skeletal muscle), associated with markedly elevated PTP1B activity; administration of a PTP1B inhibitor to the hypothalamus restores insulin signaling and improves peripheral insulin response in LMO4-deficient mice.\",\n      \"method\": \"Conditional knockout (glutamatergic neuron-specific), insulin signaling assays (phospho-IR, phospho-Akt), PTP1B activity assay, intracerebroventricular drug delivery\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with specific kinase activity assay and pharmacological rescue, single lab\",\n      \"pmids\": [\"24937445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LMO4 is required for cisplatin-induced cochlear apoptosis: hair cell-specific Lmo4 conditional knockout mice show elevated auditory brainstem response thresholds after cisplatin; LMO4 deficiency compromises STAT3 phosphorylation (anti-apoptotic) and increases activated caspase-3 in hair cells post-cisplatin.\",\n      \"method\": \"Conditional knockout (Lmo4lox/lox; Gfi1Cre), auditory brainstem response, immunostaining for phospho-STAT3 and caspase-3\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with functional hearing assay and specific molecular (STAT3/caspase-3) readouts, mechanistically links LMO4 to STAT3-mediated hair cell survival\",\n      \"pmids\": [\"33411315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LMO4 in the basolateral amygdala (BLA) is required for cue-reward learning but not fear learning or anxiety; knockdown of LMO4 in BLA (but not nucleus accumbens) impairs conditioned reinforcement; molecular analysis identifies a deficit in dopamine D2 receptor signaling in the BLA of Lmo4-deficient mice.\",\n      \"method\": \"Lmo4-deficient mice, BLA-specific RNA interference, conditioned reinforcement behavioral assay, electrophysiology (D2 receptor signaling)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — brain-region-specific RNAi with behavioral and electrophysiological readouts, single lab\",\n      \"pmids\": [\"26134647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cisplatin treatment modulates LMO4's downstream cochlear interactome: Esr1 (estrogen receptor 1) is upregulated and Stat3 is downregulated by cisplatin in the cochlea; Trolox co-treatment attenuates these effects, and immunoblots confirm cisplatin-induced decrease in cochlear STAT3 protein is attenuated by Trolox, suggesting LMO4 loss promotes STAT3 repression in cisplatin ototoxicity.\",\n      \"method\": \"Custom gene array, RT-PCR, immunoblotting (STAT3), antioxidant rescue (Trolox co-treatment) in rats\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — gene array and immunoblot in a single animal model, indirect evidence for LMO4-STAT3 link\",\n      \"pmids\": [\"25501662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Lmx1a and Lmo4 mutually negatively regulate each other in the inner ear: Lmo4 negatively regulates Lmx1a to allow formation of the three sensory cristae and blocks ectopic cochlear sensory formation; Lmx1a negatively regulates Lmo4 to mediate epithelial resorption of the canal pouch. Conditional knockout of Lmx1a shows the inner ear source is the major contributor to ear patterning.\",\n      \"method\": \"Conditional knockout of Lmx1a and compound mutant analysis with Lmo4; histology, in situ hybridization for otic markers\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional and compound knockouts establishing reciprocal genetic regulation with specific anatomical readouts\",\n      \"pmids\": [\"29769265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Yeats4 recruits the Dot1l-RNA Pol II complex onto the Lmo4 promoter by recognizing H3K27ac modification, initiating Lmo4 transcription in α4β7+ CLPs; Yeats4 conditional KO decreases ILC numbers and Lmo4 expression, and Lmo4 deficiency also impairs ILC lineage differentiation.\",\n      \"method\": \"Conditional knockout, ChIP (Yeats4, Dot1l, RNA Pol II at Lmo4 promoter), H3K27ac recognition assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP showing epigenetic recruitment to LMO4 promoter plus conditional KO phenotype, single lab\",\n      \"pmids\": [\"31434684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"LMO4 binds the Oprk1 promoter (chromatin immunoprecipitation) in the basolateral amygdala (BLA), regulating kappa opioid receptor expression; LMO4 also controls extracellular matrix gene expression in the BLA. BLA-specific Lmo4 knockdown decreases alcohol consumption; disruption of ECM or kappa opioid receptor antagonism in the BLA reduces alcohol consumption.\",\n      \"method\": \"Lmo4 heterozygous and shRNA knockdown, RNA-seq, chromatin immunoprecipitation, pharmacological dissection (BLA infusion)\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP demonstrating LMO4 at Oprk1 promoter, RNA-seq, pharmacological validation, single lab\",\n      \"pmids\": [\"32144357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Lmo4 deficiency enhances susceptibility to cisplatin-induced cochlear apoptosis: hair cell-specific conditional LMO4 deletion does not alter baseline cochlear morphology or hearing but significantly increases ABR thresholds after cisplatin; LMO4 deficiency impairs STAT3 activation, and this LMO4/STAT3 axis is an otoprotective cellular defense mechanism.\",\n      \"method\": \"Conditional knockout (Lmo4lox/lox; Gfi1Cre), ABR, immunostaining (phospho-STAT3, caspase-3)\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with functional hearing assay and specific STAT3 molecular readout, mechanistically linking LMO4 to STAT3-mediated otoprotection\",\n      \"pmids\": [\"33411315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LMO4 binds JAK1 directly and potentiates STAT3 signaling in response to IL-21 in CD8+ T cells, inducing expression of stemness-related target genes (Tcf7, Socs3, Junb, Zfp36). CRISPR/Cas9 deletion of STAT3 nullifies the enhanced memory signature conferred by LMO4. LMO4 overexpression in CD8+ T cells promotes stem-like memory phenotype and antitumor immunity.\",\n      \"method\": \"CRISPR activation screen, synthetic overexpression, co-immunoprecipitation (LMO4-JAK1 interaction), CRISPR/Cas9 Stat3 deletion, syngeneic and xenograft tumor models, transcriptomics\",\n      \"journal\": \"Signal transduction and targeted therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP demonstrating LMO4-JAK1 interaction, CRISPR epistasis (STAT3 KO nullifies LMO4 effect), multiple orthogonal methods, in vivo tumor models\",\n      \"pmids\": [\"39117617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Salmonella effector SsPH2 targets LMO4 for ubiquitination and proteasome-dependent degradation: SsPH2 mediates K48-linked poly-ubiquitination of LMO4 at Lysine 29 and Lysine 67 within the LIM domains (in vivo and in vitro); SsPH2 alters the subcellular localization of LMO4, destabilizes gp130, and inhibits STAT3 activation.\",\n      \"method\": \"Yeast two-hybrid screen, GST pull-down, co-immunoprecipitation, immunofluorescence microscopy, in vitro and in vivo ubiquitination assay, lysine mutational analysis, proteasome inhibitor rescue\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro and in vivo ubiquitination assays with mutagenesis of ubiquitination sites, multiple orthogonal biochemical methods identifying K29/K67 as modification sites\",\n      \"pmids\": [\"40693870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LMO4 promotes OSCC progression by inducing ubiquitin-proteasome-dependent degradation of the tumor suppressor RAB17, thereby promoting cancer cell proliferation, migration, and resistance to ferroptosis; restoration of RAB17 reduces these malignant behaviors and reduces in vivo tumor growth.\",\n      \"method\": \"siRNA/overexpression, ubiquitin-proteasome pathway assay, xenograft model, immunostaining for RAB17 and LMO4\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gain/loss of function with proteasome pathway assay and in vivo model, single lab, specific substrate identified\",\n      \"pmids\": [\"41213908\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LMO4 is a nuclear LIM-only adaptor protein that assembles context-dependent multi-protein transcriptional complexes through its tandem LIM domains (structurally characterized by X-ray crystallography and NMR): it binds LDB1/NLI via both LIM domains (forming a modular extended interface), and recruits context-specific partners including CtIP/RBBP8, BRCA1, DEAF1, Smad proteins, SCL, Gata2, NGN2, PPARγ, JAK1, and CREB through a common binding face on LMO4; LMO4 positively regulates BMP7 and RyR2 expression by displacing HDAC2 from target promoters; it mediates calcium-dependent transcription via CaMKIV/MAPK/CREB downstream of NMDA receptor and VSCC activation; controls cell fate decisions in spinal cord V2 interneurons, cortical projection neurons, retinal interneurons, and neural crest; is required for neural tube closure, vestibular morphogenesis, and cochlear sensory restriction; is inactivated in cisplatin ototoxicity by peroxynitrite-mediated nitration at tyrosine residues within its LIM domains leading to proteasomal degradation; and in CD8+ T cells binds JAK1 to potentiate IL-21-STAT3 signaling, promoting stem-like memory cell formation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LMO4 is a nuclear LIM-only adaptor protein that nucleates context-dependent multi-protein transcriptional complexes through its tandem LIM domains, governing cell fate, proliferation, and differentiation across neural, epithelial, and immune lineages [#3, #15, #25]. Atomic-resolution structures establish its central architecture: LDB1/NLI binds across both LIM domains in an extended conformation, contributing a third strand to a LIM1 beta-hairpin [#5, #10], while context-specific partners including CtIP/RBBP8 and DEAF1 engage a common binding face on LMO4 that overlaps the LDB1 site, making partner engagement mutually competitive [#36, #38]. The second LIM domain is required for CtIP and BRCA1 association, within which LMO4 forms a trimeric complex that represses BRCA1-mediated transcription [#3, #9]. Through these modular complexes LMO4 directs binary cell-fate choices\\u2014collaborating with SCL, Gata2 and NLI to assemble a V2b interneuron enhancer complex and with NGN2/LDB1 to activate cortical neuronal differentiation genes [#25, #27]\\u2014and acts as a ligand-dependent PPAR\\u03b3 cofactor and a Snail2 cofactor driving neural crest EMT [#24, #28, #34]. LMO4 regulates target genes in part by displacing HDAC2 from promoters, as shown for BMP7 [#18], and controls calcium-dependent transcription downstream of NMDA receptors and voltage-sensitive calcium channels via CaMKIV/MAPK/CREB [#15]. It positively regulates RyR2 to enable calcium-induced calcium release and synaptic plasticity [#30] and is required for neural tube closure, vestibular morphogenesis, and restriction of cochlear sensory organ formation, in the latter through reciprocal antagonism with Lmx1a [#11, #21, #39, #45]. In CD8+ T cells LMO4 binds JAK1 directly to potentiate IL-21\\u2013STAT3 signaling and stem-like memory formation [#49], and the same LMO4/STAT3 axis confers otoprotection in cochlear hair cells [#42, #48]. LMO4 is itself targeted for proteasomal degradation\\u2014by peroxynitrite-mediated tyrosine nitration of its LIM domains during cisplatin ototoxicity [#32] and by K48-linked ubiquitination at K29/K67 driven by the Salmonella effector SsPH2 [#50]. LMO4 overexpression is oncogenic in breast and oral cancers, promoting proliferation, invasion, and substrate degradation [#13, #51].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established LMO4's foundational molecular partnership by identifying it as a binding protein for the nuclear LIM interactor LDB1/NLI and for DEAF-1, defining a new LIM-interaction module.\",\n      \"evidence\": \"Yeast two-hybrid and expression-library screens with domain mapping\",\n      \"pmids\": [\"9736723\", \"9860983\", \"9840944\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural definition of the interaction interface yet\", \"Functional transcriptional consequence not established\", \"Displacement of LMO4 by LMO1/LMO2 inferred, not directly demonstrated\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed LMO4 assembles a defined trimeric complex with BRCA1 and CtIP and represses BRCA1-mediated transcription, giving LMO4 its first concrete role as a transcriptional regulator and tumor-relevant adaptor.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, and transcription reporter assays in yeast and mammalian cells; mammary epithelial overexpression\",\n      \"pmids\": [\"11751867\", \"11734645\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Promoters/genes directly regulated by the complex not mapped\", \"Domain requirements for each partner not yet resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved the molecular basis of LMO4 partner binding by solving the LMO4:LDB1-LID structure and mapping that the second LIM domain is required for CtIP/BRCA1 binding, converting a list of interactors into a structural model.\",\n      \"evidence\": \"NMR solution structure of LMO4:ldb1-LID; truncation-mutant binding assays; nuclear Co-IP in carcinoma cells; mammalian two-hybrid with HEN1\",\n      \"pmids\": [\"12727888\", \"12925972\", \"12771919\", \"12878195\", \"12877980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure covered only LIM1:LID, not the full tandem interface\", \"How distinct partners share or compete for surfaces unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the complete tandem LIM:LDB1 interface by crystallography and established LMO4's in vivo developmental requirement, linking the structural module to neural tube closure and a functional DEAF1 partnership.\",\n      \"evidence\": \"High-resolution X-ray crystal structure with mutagenic validation; Lmo4-null and Deaf-1-null mice with histology, BrdU, and TUNEL; phenotypic epistasis\",\n      \"pmids\": [\"15343268\", \"14966285\", \"15691703\", \"14966286\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional targets driving the neural tube phenotype not identified\", \"Whether DEAF1 and LDB1 compete for LMO4 not yet tested structurally\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended LMO4 beyond the nucleus by showing it associates with the gp130/JAK1 receptor complex and potentiates STAT3, and demonstrated its oncogenic potential in vivo, establishing roles in both cytokine signaling and breast tumorigenesis.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding, Co-IP, siRNA, reporter assays; MMTV-Lmo4 transgenic mice, siRNA, invasion/motility assays; conditional mammary knockout with BrdU\",\n      \"pmids\": [\"15677447\", \"15897450\", \"15856027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs. scaffolded nature of the gp130/JAK1 association unresolved at this stage\", \"Mechanism coupling cytoplasmic LMO4 to nuclear transcription unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected LMO4 to activity-dependent and growth-factor signaling, showing it mediates calcium-dependent transcription via CaMKIV/MAPK/CREB and integrates TGF\\u03b2/Smad and LKB1/GATA inputs.\",\n      \"evidence\": \"Calcium-stimulated reporter assays, pharmacological inhibitors, Co-IP, conditional cortical knockout with barrel-field histology; Smad Co-IP/ChIP; LKB1 complex Co-IP and p21 reporter\",\n      \"pmids\": [\"16899735\", \"16331278\", \"16580634\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct DNA contacts of LMO4-containing complexes not defined\", \"How calcium signaling alters LMO4 complex composition unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a chromatin mechanism for LMO4-mediated gene activation\\u2014displacement of HDAC2 from target promoters\\u2014and tied LMO4 to ATP/HuD-dependent post-transcriptional regulation in neuronal survival.\",\n      \"evidence\": \"ChIP of LMO4/Clim2/HDAC2 at BMP7 promoter, microarray, reporter, siRNA; 3'UTR reporter and RNA-binding-protein assays for HuD/CUGBP1\",\n      \"pmids\": [\"17452977\", \"17524392\", \"17418808\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HDAC displacement is a general LMO4 mechanism beyond BMP7 untested\", \"Direct vs. indirect recruitment to promoters not fully resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established LMO4 as a cell-fate and morphogenesis regulator across tissues\\u2014genetically with GRHL3 in epidermal differentiation/neural tube closure and as an essential ligand-dependent PPAR\\u03b3 cofactor in neuronal ischemia protection.\",\n      \"evidence\": \"Compound Grhl3/Lmo4 and Get-1/Lmo4 knockouts with EM, phospho-ERK staining, scratch assays; PPAR\\u03b3 Co-IP, mammalian two-hybrid, conditional KO, focal ischemia, SOD2 reporter, pharmacological rescue\",\n      \"pmids\": [\"18619436\", \"16949565\", \"19020036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical interface for the GRHL3 interaction not structurally mapped\", \"How LMO4 selects PPAR\\u03b3 versus other partners in vivo unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that LMO4 nucleates distinct LIM-complexes to make binary cell-fate decisions, switching V2 spinal interneurons toward an inhibitory fate via an SCL/Gata2/NLI complex, and linked LMO4 to cell-cycle-coupled proliferation in cancer.\",\n      \"evidence\": \"Conditional and compound (LMO4;SCL) mutants, enhancer reporters, Co-IP; ErbB2/PI3K profiling, siRNA, FACS cell-cycle analysis with cullin-3/cyclin readouts\",\n      \"pmids\": [\"19323994\", \"19648968\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How partner availability determines which complex LMO4 forms in a given cell unresolved\", \"Mechanism linking LMO4 to cullin-3 oscillation not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Generalized LMO4's co-activator logic by showing it bridges NLI/LDB1 to the bHLH factor NGN2 for cortical neuronal differentiation and serves as an essential Snail/Slug cofactor for neural crest induction.\",\n      \"evidence\": \"Co-IP of LMO4-NLI-NGN2 trimer, ChIP at E-box enhancers, Lmo4-null embryos, in utero electroporation migration assay; Xenopus morpholino knockdown, misexpression, Slug/Snail binding; ER\\u03b1/Alk ChIP\",\n      \"pmids\": [\"21652654\", \"22119055\", \"21976498\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same LMO4 surface engages bHLH partners as engages LDB1 not structurally shown here\", \"Direct vs. complex-mediated contact with Snail2 unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined LMO4 control of neuronal calcium handling (RyR2/CICR) and synaptic plasticity, mapped its regulation of DEAF1 nuclear export, and identified the first post-translational off-switch\\u2014tyrosine nitration during cisplatin ototoxicity driving its loss.\",\n      \"evidence\": \"Conditional forebrain KO with electrophysiology, two-photon imaging, single-cell rescue, Morris water maze; NES localization assays; MALDI-TOF identification of LMO4 nitration with reciprocal IP and co-localization; p53 Co-IP\",\n      \"pmids\": [\"22442089\", \"22723967\", \"22493493\", \"22906635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RyR2 transcription is mechanistically activated by LMO4 not detailed\", \"Which nitrated tyrosines drive degradation and the responsible E3 not identified at this stage\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Resolved the competitive-binding principle underlying LMO4 partner selection (CtIP and LDB1 share one face) and confirmed LMO4 as an essential cofactor for Snail2-driven EMT and cadherin repression.\",\n      \"evidence\": \"NMR structure of LMO4:CtIP/RBBP8 with competition assays; siRNA/shRNA knockdown, invasion and chick neural crest delamination assays, cadherin analysis; HBXIP/Sp1 promoter activation by ChIP/EMSA\",\n      \"pmids\": [\"23353824\", \"23407937\", \"23291272\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo determinants of which competing partner wins not established\", \"Direct LMO4 contact with Snail2 versus scaffolded interaction unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Broadened LMO4's competitive-surface model to DEAF1 (disorder-to-order on a shared face) and detailed its tissue-specific roles in retinal interneuron specification, cochlear sensory restriction, and hypothalamic control of Ca2+ channels, excitability, feeding, and insulin signaling.\",\n      \"evidence\": \"NMR of LMO4-LIM2:DEAF1 with mutagenesis; conditional KOs in retina (ERG), cochlea (ectopic organ of Corti), PVH and glutamatergic neurons with electrophysiology, RT-PCR of Ca2+ channels, DREADD and PTP1B-inhibitor rescue\",\n      \"pmids\": [\"25310299\", \"20949055\", \"25057208\", \"24381275\", \"24937445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in each tissue largely unmapped\", \"How a single competitive surface accommodates so many tissue partners unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established the LMO4/STAT3 axis as an otoprotective survival pathway, showing LMO4 deficiency compromises STAT3 phosphorylation and increases hair-cell apoptosis after cisplatin, and defined behavioral roles in cue-reward learning.\",\n      \"evidence\": \"Hair-cell-specific conditional KO with ABR and phospho-STAT3/caspase-3 staining; BLA-specific RNAi with conditioned-reinforcement and D2 electrophysiology; cisplatin cochlear gene array with Trolox rescue\",\n      \"pmids\": [\"33411315\", \"26134647\", \"25501662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which LMO4 supports STAT3 phosphorylation in cochlea not fully defined\", \"The cochlear array link to LMO4 is correlative (Low confidence)\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined reciprocal genetic antagonism between Lmo4 and Lmx1a as the switch patterning inner-ear sensory versus non-sensory fate, refining LMO4's role as a negative regulator of ectopic sensory organ formation.\",\n      \"evidence\": \"Conditional and compound Lmx1a/Lmo4 knockouts with histology and otic-marker in situ hybridization\",\n      \"pmids\": [\"29769265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which each gene represses the other unknown\", \"Whether the antagonism is transcriptional or post-translational unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed how Lmo4 transcription is itself epigenetically initiated\\u2014via Yeats4/Dot1l/RNA Pol II recruitment to its H3K27ac-marked promoter\\u2014and placed LMO4 in innate lymphoid cell lineage differentiation.\",\n      \"evidence\": \"Conditional Yeats4 KO, ChIP of Yeats4/Dot1l/RNA Pol II at the Lmo4 promoter, H3K27ac recognition assays, ILC phenotyping\",\n      \"pmids\": [\"31434684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct LMO4 targets driving ILC differentiation not identified\", \"Single-lab finding without orthogonal upstream confirmation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a direct cytoplasmic signaling mechanism: LMO4 binds JAK1 to potentiate IL-21\\u2013STAT3 signaling and drive stem-like CD8+ T-cell memory, with STAT3 deletion nullifying the effect\\u2014establishing LMO4 as a STAT3-pathway amplifier with antitumor immune relevance.\",\n      \"evidence\": \"CRISPR-activation screen, overexpression, LMO4-JAK1 Co-IP, CRISPR/Cas9 Stat3 deletion epistasis, syngeneic and xenograft tumor models, transcriptomics\",\n      \"pmids\": [\"39117617\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LMO4-JAK1 binding is direct via LIM domains not structurally mapped\", \"Generality of the JAK1/STAT3 axis beyond CD8+ T cells untested here\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified the degradative control points and an oncogenic substrate of LMO4: the Salmonella effector SsPH2 drives K48-linked ubiquitination at K29/K67 in the LIM domains to suppress gp130/STAT3, while LMO4 itself promotes proteasomal degradation of the tumor suppressor RAB17 in oral cancer.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, in vitro/in vivo ubiquitination with lysine mutagenesis, proteasome-inhibitor rescue; siRNA/overexpression with ubiquitin-proteasome assay and OSCC xenografts\",\n      \"pmids\": [\"40693870\", \"41213908\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The endogenous host E3 ligase regulating LMO4 turnover not identified\", \"Mechanism by which LMO4 directs RAB17 degradation (adaptor vs. ligase recruitment) unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LMO4 selects among its many mutually competitive partners in a given cell\\u2014and the upstream signals and host E3 ligases that tune its abundance to switch complex composition\\u2014remains the central open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No cell-type-resolved map of which competing partner occupies LMO4 in vivo\", \"Endogenous regulators of LMO4 stability beyond pathogen effectors and nitration unknown\", \"No structure of LMO4 bound to its bHLH (NGN2/SCL) or JAK1 partners\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [3, 15, 18, 24, 25, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 10, 25, 27, 36, 38]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [18, 24, 49]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 6, 15, 22]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [22, 49]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 15, 18, 25, 27]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [11, 21, 25, 27, 28, 39]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [15, 16, 22, 24, 49]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [46, 49]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [32, 50, 51]}\n    ],\n    \"complexes\": [\n      \"LMO4-LDB1/NLI complex\",\n      \"LMO4-BRCA1-CtIP complex\",\n      \"LMO4-SCL-Gata2-NLI V2b complex\",\n      \"LMO4-NLI-NGN2 complex\"\n    ],\n    \"partners\": [\n      \"LDB1\",\n      \"CtIP/RBBP8\",\n      \"BRCA1\",\n      \"DEAF1\",\n      \"NGN2\",\n      \"PPARG\",\n      \"JAK1\",\n      \"CREB\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}