{"gene":"MNX1","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":1999,"finding":"HB9 (MNX1) is a homeodomain transcription factor essential for consolidating motor neuron identity; in mice lacking Hb9, postmitotic motor neurons transiently acquire molecular features of V2 interneurons, and motor neuron migration, subtype identity, and axonal projection are all defective.","method":"Genetic knockout (loss-of-function) with defined cellular and axonal phenotypic readouts in mouse embryos","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — reciprocal genetic evidence from two independent labs (PMID:10482234 and PMID:10482235) with multiple orthogonal readouts","pmids":["10482234","10482235"],"is_preprint":false},{"year":1999,"finding":"HB9 (MNX1) actively suppresses interneuron genetic programs (e.g., Chx10) within postmitotic motor neurons to establish motor neuron identity, as revealed by upregulation of interneuron genes in Hb9 null mice.","method":"Genetic knockout with gene expression analysis (loss-of-function)","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined molecular phenotype, replicated independently","pmids":["10482235"],"is_preprint":false},{"year":1999,"finding":"Hlxb9 (MNX1) is required for the initiation of the dorsal pancreatic program; in Hlxb9-null mice, dorsal gut epithelium fails to initiate pancreatic differentiation, while ventral pancreatic development proceeds with later defects in beta-cell differentiation and islet organization.","method":"Genetic knockout (loss-of-function) with histological and molecular analysis of pancreatic development","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — independently replicated in two simultaneous papers (PMID:10471501 and PMID:10471502) with clean KO and multiple phenotypic readouts","pmids":["10471501","10471502"],"is_preprint":false},{"year":1999,"finding":"Hlxb9 (MNX1) null mice show dorsal pancreas agenesis and islets of Langerhans with reduced beta-cells that express low levels of Glut2 and Nkx6-1, indicating a role for MNX1 in beta-cell differentiation and function.","method":"Genetic knockout with immunohistochemistry and gene expression analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple molecular and functional readouts","pmids":["10471502"],"is_preprint":false},{"year":2001,"finding":"Persistent (temporally extended) expression of Hlxb9 in the pancreatic epithelium beyond its normal transient window impairs pancreatic morphogenesis, reduces endocrine and exocrine differentiation, and redirects the epithelium toward an intestinal-like fate, demonstrating tight temporal regulation of MNX1 is essential.","method":"Transgenic overexpression driven by Ipf1/Pdx1 promoter with histological and molecular analysis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — transgenic gain-of-function with clear phenotypic consequence and molecular characterization","pmids":["11784060"],"is_preprint":false},{"year":1998,"finding":"Patient-specific heterozygous mutations in the HLXB9 homeobox gene (missense mutations clustered in the homeodomain and truncating mutations) cause autosomal dominant Currarino syndrome (hereditary sacral agenesis), establishing HLXB9 as the disease locus at 7q36.","method":"Mutation analysis (Sanger sequencing) in familial and sporadic patients combined with linkage analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple independent families, multiple mutation types, strong genetic evidence","pmids":["9843207"],"is_preprint":false},{"year":2000,"finding":"HLXB9 missense mutations causing Currarino syndrome are significantly clustered in the homeodomain, resulting in non-conservative substitution of highly conserved residues, indicating the homeodomain DNA-binding function is critical; HLXB9 is expressed in the basal plate of the developing spinal cord/hindbrain and in pharynx, esophagus, stomach, and pancreas during human embryogenesis.","method":"Mutation survey (Sanger sequencing in 22 index patients) and in situ hybridization for expression analysis during human development (Carnegie stages 12–21)","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — large cohort mutation study with direct expression localization","pmids":["10749657"],"is_preprint":false},{"year":2001,"finding":"A fusion transcript of HLXB9 (exon 1) and ETV6 (exons 2 or 3) is generated by t(7;12)(q36;p13) in infant AML; RT-PCR showed two alternative splice forms of the HLXB9-ETV6 fusion, and the reciprocal ETV6-HLXB9 transcript was not detected, implicating either the fusion protein or disrupted ETV6 in leukemogenesis.","method":"RT-PCR with sequence analysis in AML patient samples carrying t(7;12)","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 — single method (RT-PCR) in patient samples, foundational identification of fusion","pmids":["11454678"],"is_preprint":false},{"year":2005,"finding":"In Hodgkin lymphoma cells, HLXB9 directly activates IL6 transcription (demonstrated by antisense knockdown, forced expression, and IL6 promoter reporter assays), and HLXB9 expression itself is regulated by the PI3K pathway, likely via E2F3.","method":"Antisense oligonucleotide knockdown, forced overexpression, luciferase reporter assay with IL6 promoter, PI3K/AKT pathway inhibition experiments","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in a single study, single lab","pmids":["15772702"],"is_preprint":false},{"year":2005,"finding":"HLXB9 ectopic expression in AML-M4 cell line GDM-1 results from juxtaposition with upstream regions of MYB through the translocation t(6;7)(q23;q36), establishing a novel mechanism of HLXB9 activation via enhancer hijacking from MYB.","method":"RT-PCR expression screening, karyotypic analysis, FISH mapping of chromosomal breakpoints","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 — FISH and expression analysis in defined cell line model","pmids":["15540222"],"is_preprint":false},{"year":2007,"finding":"In C. elegans, UNC-4 and its co-repressor UNC-37/Groucho repress CEH-12/HB9 in VA motor neurons; when CEH-12/HB9 is ectopically expressed in VAs, they adopt VB-type synaptic inputs, demonstrating that HB9 family proteins define synaptic partner choice downstream of UNC-4.","method":"Cell-specific microarray, genetic epistasis, and expression analysis in C. elegans","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — cell-specific microarray plus genetic epistasis with defined functional readout (synaptic input specificity)","pmids":["17289921"],"is_preprint":false},{"year":2007,"finding":"Hb9 interneurons in the mouse spinal cord are electrotonically coupled to a heterogeneous network of non-Hb9 interneurons (gap junction coupling shown by carbenoxolone blockade and calcium imaging); they exhibit bursting activity synchronous with rhythmic ventral root output even when fast chemical synaptic transmission is blocked.","method":"Two-photon calcium imaging, paired whole-cell patch-clamp, pharmacological gap junction blockade in postnatal mouse spinal cord","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal electrophysiological and imaging methods","pmids":["17715199"],"is_preprint":false},{"year":2008,"finding":"Persistent sodium current (INaP) contributes to locomotor-related membrane voltage oscillations in Hb9 interneurons independently of fast glutamatergic, GABAergic, and glycinergic synaptic inputs; riluzole blockade of slow-inactivating sodium current suppressed oscillation amplitude and frequency.","method":"Pharmacological dissection (CNQX, riluzole, glycine/GABA receptor antagonists) combined with whole-cell patch-clamp in Hb9:eGFP transgenic mice","journal":"Journal of neurophysiology","confidence":"High","confidence_rationale":"Tier 2 — multiple pharmacological methods with clear mechanistic interpretation","pmids":["18667543"],"is_preprint":false},{"year":2009,"finding":"Hb9 interneurons are rhythmically active during fictive locomotion in intact neonatal mouse spinal cord, but their activity onset lags behind ipsilateral ventral root bursts (mean phase ~0.21–0.28), indicating they are not the sole intrasegmental rhythm-generating kernel of the CPG.","method":"Two-photon calcium imaging in intact spinal cord with subsequent immunostaining for genetic identification, confirmed by whole-cell recordings","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — two orthogonal methods (imaging + electrophysiology) with genetic identification","pmids":["19759307"],"is_preprint":false},{"year":2011,"finding":"In zebrafish, mnx1 (hb9) functions downstream of retinoic acid signaling in the endoderm to control cell fate decisions in the endocrine pancreas progenitor lineage; Mnx1-deficient zebrafish lack beta-cells and concomitantly gain alpha-cells, showing that Mnx1 promotes beta-cell and suppresses alpha-cell fate.","method":"Gene knockdown, cell transplantation, transgenic reporter analysis in zebrafish","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal approaches (KD, transplantation, reporters) with clear fate-switch readout","pmids":["21989909"],"is_preprint":false},{"year":2012,"finding":"PTF1a directly binds a distant enhancer element of the Mnx1 locus in pancreas progenitors and promotes Mnx1 expression; this was demonstrated by ChIP-sequencing and RNA profiling, establishing Mnx1 as a major direct target of PTF1a in the pancreas progenitor transcription factor network.","method":"RNA profiling and ChIP-sequencing (ChIP-seq) in pancreas progenitors","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP-seq with RNA profiling, direct demonstration of PTF1a binding to Mnx1 enhancer","pmids":["22232429"],"is_preprint":false},{"year":2012,"finding":"In zebrafish, the hb9/mnx1 beta-cell progenitor-specific enhancer contains paired-box transcription factor binding sites and E-boxes; EMSA studies showed Pax6b and NeuroD interact with these elements, and genetic analysis showed Pax6b is required for maintenance (but not induction) of pancreatic hb9 transcription.","method":"Enhancer reporter transgenic analysis, EMSA, genetic epistasis (pax6b mutants) in zebrafish","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 1/2 — EMSA (direct binding) combined with transgenic and genetic approaches","pmids":["22426004"],"is_preprint":false},{"year":2012,"finding":"HB9 binds directly to the PTGER2 (prostaglandin E receptor 2) promoter via its functional homeodomain; HB9 binding requires both the homeodomain and the HB9-binding domain in the PTGER2 promoter, leading to transcriptional repression of PTGER2 and reduced intracellular cAMP in hematopoietic cells. Overall HB9 acts predominantly as a transcriptional repressor (78% of significantly regulated target genes are downregulated) with target enrichment in cell-adhesion and cell-cell interaction pathways.","method":"ChIP-on-chip, luciferase reporter assay, expression profiling, cAMP functional assay in HL-60 cells and t(7;12) patient bone marrow","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — ChIP-on-chip plus reporter assay plus mutagenesis of binding domain plus functional cAMP readout","pmids":["23048027"],"is_preprint":false},{"year":2013,"finding":"Hlxb9 interacts physically with menin (encoded by MEN1) in pancreatic beta-cells; upon menin knockdown, Hlxb9 is post-transcriptionally upregulated, reduces cell proliferation, and causes apoptosis in the presence of menin, and regulates genes controlling insulin levels.","method":"Co-immunoprecipitation (binding interaction), menin knockdown, cell proliferation and apoptosis assays in MIN6 beta-cell line","journal":"Endocrine-related cancer","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, Co-IP plus functional assays but limited mechanistic depth","pmids":["23419452"],"is_preprint":false},{"year":2014,"finding":"GSK-3β phosphorylates HLXB9 at Ser-78/Ser-80, stabilizing it predominantly in the nucleus; phospho-HLXB9 (pHLXB9) and active GSK-3β are elevated in insulinoma cells and human sporadic insulinomas, and pharmacologic GSK-3β inhibition blocks insulinoma cell proliferation by G2/M arrest and apoptosis.","method":"Site-directed mutagenesis of phosphorylation sites, Western blotting, pharmacological GSK-3β inhibition, cell cycle and apoptosis analysis in rodent insulinoma cell lines and human tumor samples","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — site mutagenesis confirming phosphorylation sites plus in vitro and in vivo functional validation","pmids":["24425879"],"is_preprint":false},{"year":2014,"finding":"Homozygous loss-of-function mutations in MNX1 cause permanent neonatal diabetes in humans, confirming MNX1 as an etiological gene for human pancreatic beta-cell development; the causal mutation (p.Phe272Leu) is located within the MNX1 homeodomain helix 2, and MNX1 is enriched in human embryonic pancreatic epithelium compared with mesenchyme.","method":"Homozygosity mapping, Sanger sequencing in consanguineous patients, expression analysis in human embryonic pancreatic tissue","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — multiple independent patients with recessive mutations plus expression localization in human tissue","pmids":["24411943","23562494"],"is_preprint":false},{"year":2015,"finding":"Conditional inactivation of Mnx1 in endocrine progenitors or embryonic beta-cells reveals that Mnx1 promotes beta-cell while suppressing delta-cell differentiation programs; loss of Mnx1 in embryonic beta-cells leads to postnatal beta-to-delta-like transdifferentiation, and beta-cells escaping Mnx1 inactivation upregulate Mnx1 and undergo persistent proliferation.","method":"Conditional genetic knockout (stage-specific Cre-lox), lineage tracing, longitudinal histological and functional analysis in mice","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple temporal stages, lineage tracing, and functional islet assays","pmids":["26534984"],"is_preprint":false},{"year":2016,"finding":"MNX1 upregulates lipid synthesis by stimulating expression of SREBP1 and fatty acid synthase (FASN) in prostate cancer cells; both androgen and AKT signaling pathways increase MNX1 expression.","method":"Gene expression analysis, pathway inhibition experiments, overexpression/knockdown in prostate cancer cell lines","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, functional experiments without direct ChIP evidence for SREBP1 promoter binding","pmids":["27578002"],"is_preprint":false},{"year":2017,"finding":"RGS12 tumor suppressor negatively regulates MNX1 expression by decreasing AKT activity; RGS12 expression correlates negatively with MNX1, and RGS12 knockdown increases MNX1 levels, establishing an RGS12-AKT-MNX1 oncogenic axis in African-American prostate cancer.","method":"Loss-of-function (RGS12 knockdown/KO) with expression analysis in vitro and in vivo xenograft models","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, correlation with functional validation but indirect mechanism","pmids":["28611045"],"is_preprint":false},{"year":2018,"finding":"MNX1 transcriptionally upregulates CCNE1 (Cyclin E1) and CCNE2 (Cyclin E2) by directly binding to their promoters, promoting G1-S cell cycle transition in bladder cancer cells.","method":"ChIP assay demonstrating direct promoter binding, real-time PCR, Western blotting, cell cycle analysis; in vitro and in vivo (xenograft) functional experiments","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — direct ChIP evidence plus functional phenotype, single lab","pmids":["30012177"],"is_preprint":false},{"year":2018,"finding":"HB9 expression in human hematopoietic stem and progenitor cells induces premature senescence via the p53-p21 tumor suppressor network and causes a myeloid-biased differentiation arrest at the megakaryocyte/erythrocyte progenitor stage in vivo.","method":"Retroviral transduction in human HT1080 and NIH3T3 cells (senescence assays), murine HSPC transplantation (in vivo differentiation), gene expression profiling in human CD34+ cells","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 — multiple cell systems and in vivo model, single lab","pmids":["30093397"],"is_preprint":false},{"year":2018,"finding":"MNX1 functions as a transcriptional activator of TrkB by binding its upstream regulatory region, thereby promoting anoikis resistance in glioma cells.","method":"RT-PCR, Western blotting, adhesion assay, overexpression/knockdown experiments, transcription factor binding assay (upstream region)","journal":"Molecular medicine reports","confidence":"Low","confidence_rationale":"Tier 3 — single lab, promoter binding without formal ChIP confirmation","pmids":["30066929"],"is_preprint":false},{"year":2019,"finding":"MNX1 activates Wnt/β-catenin signaling in colorectal cancer cells, upregulating downstream targets c-Myc and CCND1, as shown by luciferase reporter analysis.","method":"Luciferase reporter assay (Wnt/β-catenin), overexpression/knockdown, Western blotting in colorectal cancer cells","journal":"Cell biology international","confidence":"Low","confidence_rationale":"Tier 3 — single lab, reporter assay without direct mechanistic target identification","pmids":["30614606"],"is_preprint":false},{"year":2020,"finding":"MNX1 protein is expressed in beta-cells and promotes their proliferation; in the MNX1-AS1/c-Myc context, MNX1-AS1 promotes expression of MNX1 (sense transcript) in ICC via recruitment of transcription factors c-Myc and MAZ to the MNX1 promoter, and MNX1 in turn upregulates Ajuba to suppress the Hippo signaling pathway.","method":"Chromatin immunoprecipitation (ChIP) showing c-Myc and MAZ binding to MNX1 promoter; MNX1 ChIP on Ajuba promoter; functional assays in ICC cell lines and xenograft models","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP evidence for direct promoter binding plus functional pathway validation, single lab","pmids":["33093444"],"is_preprint":false},{"year":2020,"finding":"MNX1 transcriptionally represses p21cip1 (CDKN1A) by binding its promoter, thereby accelerating G1/S cell cycle transition in cervical cancer cells.","method":"ChIP assay (direct promoter binding), luciferase reporter assay, flow cytometry (cell cycle), overexpression/knockdown with RTCA and xenograft in vivo","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and reporter assay demonstrating direct transcriptional repression, single lab","pmids":["32850410"],"is_preprint":false},{"year":2021,"finding":"Chromatin conformation and accessibility analyses in pancreatic organoids show that MNX1 and HNF1B form a biologically indispensable axis in IPMN lineages, governing a target gene set including MYC, SOX9, and OLFM4; MNX1 upregulation is specifically marked in human IPMN lineage tissues.","method":"ATAC-seq, ChIP-seq, Hi-C (chromosome conformation capture), shRNA/CRISPRi functional assays in human organoids derived from IPMN/PDAC","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 1/2 — multiple orthogonal genomic methods plus functional validation in organoids","pmids":["34953915"],"is_preprint":false},{"year":2021,"finding":"Elimination of vesicular glutamate transporter 2 (VGLUT2) from Hb9 interneurons in mice using an inducible Cre line causes no deficits in treadmill locomotion, indicating that glutamatergic neurotransmission from Hb9 interneurons is dispensable for locomotor behavior.","method":"Conditional genetic knockout of VGLUT2 in Hb9 interneurons using inducible Cre recombinase; treadmill locomotion behavioral testing","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — clean conditional KO with specific behavioral readout; refines circuit model","pmids":["34362940"],"is_preprint":false},{"year":2024,"finding":"Retroviral expression of MNX1 alone induces AML in immune-incompetent mice from fetal (but not adult) hematopoietic stem and progenitor cells; MNX1 increases H3K4 mono/di/trimethylation and reduces H3K27me3, alters genome-wide chromatin accessibility, and interacts with the methionine cycle and methyltransferases. Pre-treatment with the SAM analog Sinefungin prevents AML development, implicating histone methylation as the key oncogenic mechanism.","method":"Retroviral MNX1 expression in fetal vs. adult murine HSPCs with transplantation, ChIP for histone marks, ATAC-seq, gene expression profiling, co-IP with methyltransferases, pharmacological inhibition (Sinefungin)","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 1/2 — in vivo leukemia induction model plus multiple epigenomic methods and mechanistic rescue experiment","pmids":["37317878"],"is_preprint":false},{"year":2024,"finding":"In t(7;12)(q36;p13) AML, the translocation breaks proximal to MNX1 and within introns 1 or 2 of ETV6, causing enhancer hijacking that drives aberrant MNX1 overexpression in hematopoietic cells, as demonstrated by chromatin interaction assays in an iPSC t(7;12) model.","method":"Breakpoint mapping, ATAC-seq, chromatin conformation capture (Hi-C-like assays) in iPSC t(7;12) model","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 1/2 — chromatin interaction assay directly demonstrates enhancer hijacking mechanism in iPSC model","pmids":["39121370"],"is_preprint":false},{"year":2004,"finding":"HB9 protein contains two functional nuclear localization signal (NLS) sequences within its homeodomain: one bipartite type (resembling Xenopus nucleoplasmin NLS) and one hexapeptide type (similar to PDX1 NLS); both are sufficient for nuclear import in primary keratinocytes and dermal fibroblasts. HB9 protein localizes to both nucleus and cytoplasm (ER and Golgi) in a tissue-context-dependent manner.","method":"GFP fusion protein nuclear import assay in primary keratinocyte culture; immunofluorescence; immunoelectron microscopy","journal":"Histochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct NLS characterization with GFP fusion functional assay, single lab","pmids":["15338230"],"is_preprint":false}],"current_model":"MNX1 (HB9/HLXB9) encodes a homeodomain transcription factor that acts primarily as a transcriptional repressor to consolidate motor neuron identity (by suppressing interneuron programs) and as an activator/repressor to specify dorsal pancreatic fate and beta-cell identity (promoting beta- and suppressing alpha/delta-cell programs); its homeodomain mediates DNA binding and nuclear import, and it is post-translationally regulated by GSK-3β phosphorylation at Ser-78/Ser-80; in leukemia, ectopic MNX1 expression driven by chromosomal translocation-mediated enhancer hijacking causes AML by altering histone methylation (H3K4me and H3K27me3) and repressing a broad target gene set including PTGER2 and cell-adhesion genes."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing MNX1 as a disease gene: heterozygous mutations in the HLXB9 homeodomain were identified as causative for Currarino syndrome, linking the gene's DNA-binding domain to human caudal developmental defects.","evidence":"Sanger sequencing and linkage analysis in familial and sporadic Currarino syndrome patients","pmids":["9843207"],"confidence":"High","gaps":["Mechanism by which haploinsufficiency causes sacral agenesis is unknown","No animal model recapitulating Currarino phenotype was available"]},{"year":1999,"claim":"Knockout studies simultaneously established MNX1 as essential for two distinct developmental programs—motor neuron identity consolidation (by repressing interneuron genes) and dorsal pancreas initiation/beta-cell differentiation—revealing it as a cell-fate selector in both neural and endocrine lineages.","evidence":"Independent Hb9/Hlxb9 knockout mouse studies with histological, molecular, and axonal phenotyping","pmids":["10482234","10482235","10471501","10471502"],"confidence":"High","gaps":["Direct transcriptional targets were not identified","Whether MNX1 acts as activator or repressor was unresolved","Mechanism of V2 interneuron gene derepression unknown"]},{"year":2001,"claim":"Two new dimensions of MNX1 biology emerged: temporal regulation proved critical for pancreatic morphogenesis (persistent expression redirects epithelium to intestinal fate), and the HLXB9-ETV6 fusion transcript from t(7;12) was identified in infant AML, implicating MNX1 in leukemogenesis.","evidence":"Transgenic overexpression via Pdx1 promoter in mice; RT-PCR fusion transcript detection in AML patient samples","pmids":["11784060","11454678"],"confidence":"High","gaps":["Whether the fusion protein or ectopic wild-type MNX1 drives leukemogenesis was unclear","Mechanism of pancreatic-to-intestinal fate switch was not molecularly defined"]},{"year":2004,"claim":"The homeodomain of MNX1 was shown to harbor two functional nuclear localization signals sufficient for nuclear import, explaining how homeodomain mutations could disrupt both DNA binding and subcellular targeting.","evidence":"GFP-NLS fusion import assays in primary keratinocytes; immunoelectron microscopy","pmids":["15338230"],"confidence":"Medium","gaps":["Context-dependent cytoplasmic localization (ER/Golgi) was observed but unexplained","No confirmation in motor neurons or beta-cells"]},{"year":2005,"claim":"MNX1 was linked to transcriptional activation of IL6 in Hodgkin lymphoma and shown to be ectopically activated via enhancer hijacking from MYB in AML, broadening its oncogenic roles beyond t(7;12).","evidence":"Antisense knockdown plus forced expression plus IL6 promoter reporter; FISH breakpoint mapping in GDM-1 cell line","pmids":["15772702","15540222"],"confidence":"Medium","gaps":["Direct MNX1 binding to IL6 promoter not demonstrated by ChIP","Enhancer hijacking mechanism not confirmed at chromatin level"]},{"year":2007,"claim":"In C. elegans, the HB9 ortholog CEH-12 was shown to specify synaptic partner choice in motor neurons downstream of UNC-4/Groucho repression, extending the conserved role of HB9 family members in motor neuron subtype identity to synaptic connectivity.","evidence":"Cell-specific microarray, genetic epistasis, and synaptic input specificity assays in C. elegans","pmids":["17289921"],"confidence":"High","gaps":["Whether mammalian HB9 similarly specifies synaptic input choice is untested","Direct transcriptional targets of CEH-12 mediating synaptic specificity unknown"]},{"year":2007,"claim":"Hb9-expressing spinal interneurons were characterized as rhythmically active neurons electrotonically coupled to heterogeneous networks via gap junctions, with persistent sodium current (INaP) driving locomotor-related oscillations, defining their electrophysiological properties within the locomotor central pattern generator.","evidence":"Two-photon calcium imaging, paired patch-clamp, pharmacological dissection (carbenoxolone, riluzole) in Hb9:eGFP transgenic mice","pmids":["17715199","18667543","19759307"],"confidence":"High","gaps":["Hb9 interneuron activity lags ventral root bursts, so their precise role in rhythm generation remains debated","Glutamatergic output from Hb9 interneurons was later shown dispensable for locomotion (PMID:34362940)"]},{"year":2011,"claim":"Zebrafish studies resolved MNX1's pancreatic function as a binary fate switch: Mnx1 promotes beta-cell and suppresses alpha-cell fate downstream of retinoic acid signaling in the endoderm, establishing a cell-autonomous role.","evidence":"Gene knockdown, cell transplantation, transgenic reporter analysis in zebrafish","pmids":["21989909"],"confidence":"High","gaps":["Downstream transcriptional targets mediating the alpha-to-beta switch not identified","Whether this is direct transcriptional repression of alpha-cell genes was unresolved"]},{"year":2012,"claim":"The upstream regulation and direct target repertoire of MNX1 were defined: PTF1a directly binds an Mnx1 enhancer in pancreas progenitors, Pax6b/NeuroD maintain pancreatic Mnx1 expression, and MNX1 acts predominantly as a transcriptional repressor (78% of targets downregulated) with direct homeodomain-dependent repression of PTGER2 and enrichment for cell-adhesion gene targets.","evidence":"ChIP-seq for PTF1a; EMSA for Pax6b/NeuroD; ChIP-on-chip, luciferase reporter, and cAMP assays for PTGER2 repression in HL-60/patient cells","pmids":["22232429","22426004","23048027"],"confidence":"High","gaps":["Full genome-wide direct target map in motor neurons absent","Co-repressor complexes mediating repression not identified"]},{"year":2014,"claim":"Post-translational regulation of MNX1 was established: GSK-3β phosphorylates Ser-78/Ser-80, stabilizing MNX1 in the nucleus; this mechanism is hyperactivated in insulinomas. Separately, homozygous loss-of-function MNX1 mutations were identified as a cause of permanent neonatal diabetes, confirming MNX1's essential role in human beta-cell development.","evidence":"Site-directed mutagenesis of phosphorylation sites, pharmacological GSK-3β inhibition in insulinoma cells; homozygosity mapping and sequencing in consanguineous PNDM patients","pmids":["24425879","24411943"],"confidence":"High","gaps":["Whether phosphorylation affects DNA-binding affinity or co-factor recruitment unknown","Mechanism linking homeodomain F272L mutation to beta-cell failure not characterized"]},{"year":2015,"claim":"Conditional knockout studies revealed that MNX1 is required not only for initial beta-cell specification but also for maintaining beta-cell identity postnatally, as loss leads to beta-to-delta-like transdifferentiation, while escapee beta-cells upregulate Mnx1 and proliferate.","evidence":"Stage-specific conditional Cre-lox knockout with lineage tracing and functional islet assays in mice","pmids":["26534984"],"confidence":"High","gaps":["Direct targets maintaining beta-cell vs. delta-cell identity not defined","Whether human beta-cells undergo similar transdifferentiation upon MNX1 loss unknown"]},{"year":2018,"claim":"MNX1's oncogenic transcriptional activity was extended to multiple cancers: it directly binds and activates CCNE1/CCNE2 promoters to drive G1-S transition in bladder cancer and represses CDKN1A (p21) in cervical cancer, while in hematopoietic progenitors it induces senescence via p53-p21.","evidence":"ChIP assays for CCNE1/CCNE2 and CDKN1A promoter binding; retroviral MNX1 expression in HSPCs with in vivo transplantation; cell cycle analysis","pmids":["30012177","32850410","30093397"],"confidence":"Medium","gaps":["Context-dependent switch between senescence induction and proliferation promotion unresolved","Co-factors determining activator vs. repressor function at different promoters unknown"]},{"year":2021,"claim":"MNX1 was positioned within a chromatin regulatory network in pancreatic neoplasia: in IPMN organoids, MNX1 and HNF1B form a functionally indispensable axis governing MYC, SOX9, and OLFM4 expression, and glutamatergic output from Hb9 spinal interneurons was shown dispensable for locomotion.","evidence":"ATAC-seq, ChIP-seq, Hi-C, CRISPRi in human IPMN/PDAC organoids; conditional VGLUT2 knockout in Hb9 interneurons with behavioral testing","pmids":["34953915","34362940"],"confidence":"High","gaps":["Whether MNX1 directly binds SOX9/OLFM4 regulatory regions or acts indirectly unresolved","Non-glutamatergic signaling mechanisms of Hb9 interneurons in locomotion undefined"]},{"year":2024,"claim":"The leukemogenic mechanism of ectopic MNX1 was resolved: MNX1 alone induces AML from fetal HSPCs by broadly increasing H3K4me1/2/3 and reducing H3K27me3 through interaction with methyltransferases, and t(7;12) was confirmed to cause enhancer hijacking driving MNX1 overexpression via chromatin interaction assays.","evidence":"Retroviral MNX1 expression in fetal/adult HSPCs with transplantation, histone ChIP, ATAC-seq, co-IP with methyltransferases, Sinefungin rescue; breakpoint mapping, Hi-C in iPSC t(7;12) model","pmids":["37317878","39121370"],"confidence":"High","gaps":["Specific methyltransferase(s) mediating MNX1-dependent H3K4 methylation not individually identified","Why fetal but not adult HSPCs are susceptible is mechanistically unexplained","Whether enhancer hijacking model applies to all t(7;12) AML patients unknown"]},{"year":null,"claim":"Key open questions include: the co-repressor/co-activator complexes through which MNX1 exerts context-dependent transcriptional regulation; the direct target gene network in motor neurons; the structural basis for homeodomain mutations causing Currarino syndrome vs. neonatal diabetes; and the developmental window dependency of MNX1 leukemogenicity.","evidence":"","pmids":[],"confidence":"Low","gaps":["No co-repressor complex identified for MNX1 in any system","No crystal structure of MNX1 homeodomain–DNA complex available","Genome-wide direct target map in motor neurons absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[5,6,17,24,29,34]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1,2,4,8,14,17,21,24,29,30]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[19,34]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[34]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1,2,3,10,14,21]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,17,24,29,30]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[24,29]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[7,9,32,33]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[32]}],"complexes":[],"partners":["MEN1","PTF1A","PAX6B","GSK3B","HNF1B"],"other_free_text":[]},"mechanistic_narrative":"MNX1 (HB9/HLXB9) encodes a homeodomain transcription factor that functions primarily as a transcriptional repressor to consolidate cell identity in motor neurons and pancreatic endocrine lineages. In the developing spinal cord, MNX1 suppresses interneuron genetic programs (e.g., Chx10) in postmitotic motor neurons, and its loss causes motor neurons to transiently acquire V2 interneuron features with defective migration and axonal projection [PMID:10482234, PMID:10482235]; in the pancreas, MNX1 is required for dorsal pancreas initiation and beta-cell differentiation, actively promoting beta-cell fate while suppressing alpha- and delta-cell programs, with loss-of-function mutations causing permanent neonatal diabetes in humans and heterozygous homeodomain mutations causing autosomal dominant Currarino syndrome [PMID:10471501, PMID:24411943, PMID:9843207, PMID:26534984]. MNX1 binds target gene promoters via its homeodomain to repress genes including PTGER2 and CDKN1A and activate targets including CCNE1/CCNE2, is post-translationally stabilized in the nucleus by GSK-3β phosphorylation at Ser-78/Ser-80, and is regulated upstream by PTF1a, Pax6b, and the PI3K/AKT pathway [PMID:23048027, PMID:24425879, PMID:22232429, PMID:30012177]. In hematopoietic cells, chromosomal translocations drive ectopic MNX1 expression through enhancer hijacking, and MNX1 induces AML from fetal hematopoietic progenitors by broadly increasing H3K4 methylation and reducing H3K27me3, a mechanism blocked by the SAM analog Sinefungin [PMID:37317878, PMID:39121370]."},"prefetch_data":{"uniprot":{"accession":"P50219","full_name":"Motor neuron and pancreas homeobox protein 1","aliases":["Homeobox protein HB9"],"length_aa":401,"mass_kda":40.6,"function":"Transcription factor (By similarity). Recognizes and binds to the regulatory elements of target genes, such as visual system homeobox CHX10, negatively modulating transcription (By similarity). Plays a role in establishing motor neuron identity, in concert with LIM domain transcription factor LMO4 (By similarity). Involved in negatively modulating transcription of interneuron genes in motor neurons, acting, at least in part, by blocking regulatory sequence interactions of the ISL1-LHX3 complex (By similarity). Involved in pancreas development and function; may play a role in pancreatic cell fate specification (By similarity)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P50219/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MNX1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MNX1","total_profiled":1310},"omim":[{"mim_id":"600488","title":"PROPROTEIN CONVERTASE, SUBTILISIN/KEXIN-TYPE, 5; PCSK5","url":"https://www.omim.org/entry/600488"},{"mim_id":"260350","title":"PANCREATIC CANCER","url":"https://www.omim.org/entry/260350"},{"mim_id":"182960","title":"NEURONOPATHY, DISTAL HEREDITARY MOTOR, AUTOSOMAL DOMINANT 1; HMND1","url":"https://www.omim.org/entry/182960"},{"mim_id":"176450","title":"CURRARINO SYNDROME","url":"https://www.omim.org/entry/176450"},{"mim_id":"142994","title":"MOTOR NEURON AND PANCREAS HOMEOBOX 1; MNX1","url":"https://www.omim.org/entry/142994"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"intestine","ntpm":6.8},{"tissue":"pancreas","ntpm":15.3}],"url":"https://www.proteinatlas.org/search/MNX1"},"hgnc":{"alias_symbol":["HB9","HOXHB9","SCRA1"],"prev_symbol":["HLXB9"]},"alphafold":{"accession":"P50219","domains":[{"cath_id":"1.10.10.60","chopping":"249-311","consensus_level":"medium","plddt":95.4211,"start":249,"end":311}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P50219","model_url":"https://alphafold.ebi.ac.uk/files/AF-P50219-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P50219-F1-predicted_aligned_error_v6.png","plddt_mean":57.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MNX1","jax_strain_url":"https://www.jax.org/strain/search?query=MNX1"},"sequence":{"accession":"P50219","fasta_url":"https://rest.uniprot.org/uniprotkb/P50219.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P50219/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P50219"}},"corpus_meta":[{"pmid":"10482234","id":"PMC_10482234","title":"Requirement for the homeobox gene Hb9 in the consolidation of motor neuron identity.","date":"1999","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/10482234","citation_count":507,"is_preprint":false},{"pmid":"10482235","id":"PMC_10482235","title":"Active suppression of interneuron programs within developing motor neurons revealed by analysis of homeodomain factor HB9.","date":"1999","source":"Neuron","url":"https://pubmed.ncbi.nlm.nih.gov/10482235","citation_count":308,"is_preprint":false},{"pmid":"10471501","id":"PMC_10471501","title":"Selective agenesis of the dorsal pancreas in mice lacking homeobox gene Hlxb9.","date":"1999","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10471501","citation_count":302,"is_preprint":false},{"pmid":"10471502","id":"PMC_10471502","title":"Pancreas dorsal lobe agenesis and abnormal islets of Langerhans in Hlxb9-deficient mice.","date":"1999","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10471502","citation_count":281,"is_preprint":false},{"pmid":"9843207","id":"PMC_9843207","title":"A homeobox gene, HLXB9, is the major locus for dominantly inherited sacral agenesis.","date":"1998","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9843207","citation_count":215,"is_preprint":false},{"pmid":"15958737","id":"PMC_15958737","title":"Conditional rhythmicity of ventral spinal interneurons defined by expression of the Hb9 homeodomain protein.","date":"2005","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/15958737","citation_count":183,"is_preprint":false},{"pmid":"17905441","id":"PMC_17905441","title":"Strategies for delineating spinal locomotor rhythm-generating networks and the possible role of Hb9 interneurones in rhythmogenesis.","date":"2007","source":"Brain research reviews","url":"https://pubmed.ncbi.nlm.nih.gov/17905441","citation_count":118,"is_preprint":false},{"pmid":"31924214","id":"PMC_31924214","title":"TEAD4 modulated LncRNA MNX1-AS1 contributes to gastric cancer progression partly through suppressing BTG2 and activating BCL2.","date":"2020","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/31924214","citation_count":116,"is_preprint":false},{"pmid":"24411943","id":"PMC_24411943","title":"Analysis of transcription factors key for mouse pancreatic development establishes NKX2-2 and MNX1 mutations as causes of neonatal diabetes in man.","date":"2014","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/24411943","citation_count":114,"is_preprint":false},{"pmid":"10749657","id":"PMC_10749657","title":"Mutation analysis and embryonic expression of the HLXB9 Currarino syndrome gene.","date":"2000","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/10749657","citation_count":104,"is_preprint":false},{"pmid":"36214649","id":"PMC_36214649","title":"MNX1-AS1 Promotes Phase Separation of IGF2BP1 to Drive c-Myc-Mediated Cell-Cycle Progression and Proliferation in Lung Cancer.","date":"2022","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/36214649","citation_count":72,"is_preprint":false},{"pmid":"16646086","id":"PMC_16646086","title":"High incidence of t(7;12)(q36;p13) in infant AML but not in infant ALL, with a dismal outcome and ectopic expression of HLXB9.","date":"2006","source":"Genes, chromosomes & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/16646086","citation_count":68,"is_preprint":false},{"pmid":"18449898","id":"PMC_18449898","title":"Spectrum of HLXB9 gene mutations in Currarino syndrome and genotype-phenotype correlation.","date":"2008","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/18449898","citation_count":65,"is_preprint":false},{"pmid":"33782099","id":"PMC_33782099","title":"MYC-Activated LncRNA MNX1-AS1 Promotes the Progression of Colorectal Cancer by Stabilizing YB1.","date":"2021","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/33782099","citation_count":64,"is_preprint":false},{"pmid":"18667543","id":"PMC_18667543","title":"Persistent sodium current contributes to induced voltage oscillations in locomotor-related hb9 interneurons in the mouse spinal cord.","date":"2008","source":"Journal of neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/18667543","citation_count":64,"is_preprint":false},{"pmid":"11784060","id":"PMC_11784060","title":"Persistent expression of Hlxb9 in the pancreatic epithelium impairs pancreatic development.","date":"2001","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/11784060","citation_count":61,"is_preprint":false},{"pmid":"19759307","id":"PMC_19759307","title":"Activity of Hb9 interneurons during fictive locomotion in mouse spinal cord.","date":"2009","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/19759307","citation_count":61,"is_preprint":false},{"pmid":"31170665","id":"PMC_31170665","title":"LncRNA MNX1-AS1 promotes progression of esophageal squamous cell carcinoma by regulating miR-34a/SIRT1 axis.","date":"2019","source":"Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie","url":"https://pubmed.ncbi.nlm.nih.gov/31170665","citation_count":55,"is_preprint":false},{"pmid":"17715199","id":"PMC_17715199","title":"Heterogeneous electrotonic coupling and synchronization of rhythmic bursting activity in mouse Hb9 interneurons.","date":"2007","source":"Journal of neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/17715199","citation_count":55,"is_preprint":false},{"pmid":"30618167","id":"PMC_30618167","title":"Long noncoding RNA MNX1-AS1 contributes to lung cancer progression through the miR-527/BRF2 pathway.","date":"2019","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/30618167","citation_count":54,"is_preprint":false},{"pmid":"21989909","id":"PMC_21989909","title":"Zebrafish mnx1 controls cell fate choice in the developing endocrine pancreas.","date":"2011","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/21989909","citation_count":54,"is_preprint":false},{"pmid":"21538811","id":"PMC_21538811","title":"In vivo labeling of zebrafish motor neurons using an mnx1 enhancer and Gal4/UAS.","date":"2011","source":"Genesis (New York, N.Y. : 2000)","url":"https://pubmed.ncbi.nlm.nih.gov/21538811","citation_count":54,"is_preprint":false},{"pmid":"11454678","id":"PMC_11454678","title":"Fusion of the homeobox gene HLXB9 and the ETV6 gene in infant acute myeloid leukemias with the t(7;12)(q36;p13).","date":"2001","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/11454678","citation_count":53,"is_preprint":false},{"pmid":"22426004","id":"PMC_22426004","title":"Characterization and regulation of the hb9/mnx1 beta-cell progenitor specific enhancer in zebrafish.","date":"2012","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/22426004","citation_count":51,"is_preprint":false},{"pmid":"29678219","id":"PMC_29678219","title":"lncRNA MNX1-AS1 Promotes Glioblastoma Progression Through Inhibition of miR-4443.","date":"2018","source":"Oncology research","url":"https://pubmed.ncbi.nlm.nih.gov/29678219","citation_count":51,"is_preprint":false},{"pmid":"27578002","id":"PMC_27578002","title":"MNX1 Is Oncogenically Upregulated in African-American Prostate Cancer.","date":"2016","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/27578002","citation_count":51,"is_preprint":false},{"pmid":"17289921","id":"PMC_17289921","title":"UNC-4 represses CEH-12/HB9 to specify synaptic inputs to VA motor neurons in C. elegans.","date":"2007","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/17289921","citation_count":49,"is_preprint":false},{"pmid":"30362161","id":"PMC_30362161","title":"E2F1-mediated MNX1-AS1-miR-218-5p-SEC61A1 feedback loop contributes to the progression of colon adenocarcinoma.","date":"2018","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30362161","citation_count":47,"is_preprint":false},{"pmid":"22232429","id":"PMC_22232429","title":"RNA profiling and chromatin immunoprecipitation-sequencing reveal that PTF1a stabilizes pancreas progenitor identity via the control of MNX1/HLXB9 and a network of other transcription factors.","date":"2012","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/22232429","citation_count":45,"is_preprint":false},{"pmid":"30982576","id":"PMC_30982576","title":"Long non-coding RNA MNX1-AS1 promotes hepatocellular carcinoma proliferation and invasion through targeting miR-218-5p/COMMD8 axis.","date":"2019","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/30982576","citation_count":44,"is_preprint":false},{"pmid":"15211664","id":"PMC_15211664","title":"Minimal clinical expression of the holoprosencephaly spectrum and of Currarino syndrome due to different cytogenetic rearrangements deleting the Sonic Hedgehog gene and the HLXB9 gene at 7q36.3.","date":"2004","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/15211664","citation_count":44,"is_preprint":false},{"pmid":"11455421","id":"PMC_11455421","title":"The Mnx homeobox gene class defined by HB9, MNR2 and amphioxus AmphiMnx.","date":"2001","source":"Development genes and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/11455421","citation_count":43,"is_preprint":false},{"pmid":"23562494","id":"PMC_23562494","title":"Transcription factor gene MNX1 is a novel cause of permanent neonatal diabetes in a consanguineous family.","date":"2013","source":"Diabetes & metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/23562494","citation_count":43,"is_preprint":false},{"pmid":"28414551","id":"PMC_28414551","title":"Long Noncoding RNA MNX1-AS1 Knockdown Inhibits Cell Proliferation and Migration in Ovarian Cancer.","date":"2017","source":"Cancer biotherapy & radiopharmaceuticals","url":"https://pubmed.ncbi.nlm.nih.gov/28414551","citation_count":42,"is_preprint":false},{"pmid":"15772702","id":"PMC_15772702","title":"HLXB9 activates IL6 in Hodgkin lymphoma cell lines and is regulated by PI3K signalling involving E2F3.","date":"2005","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/15772702","citation_count":38,"is_preprint":false},{"pmid":"26534984","id":"PMC_26534984","title":"Inactivating the permanent neonatal diabetes gene Mnx1 switches insulin-producing β-cells to a δ-like fate and reveals a facultative proliferative capacity in aged β-cells.","date":"2015","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/26534984","citation_count":38,"is_preprint":false},{"pmid":"30302806","id":"PMC_30302806","title":"LncRNA MNX1-AS1 promotes the progression of cervical cancer through activating MAPK pathway.","date":"2018","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30302806","citation_count":35,"is_preprint":false},{"pmid":"19710170","id":"PMC_19710170","title":"dbx mediates neuronal specification and differentiation through cross-repressive, lineage-specific interactions with eve and hb9.","date":"2009","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/19710170","citation_count":34,"is_preprint":false},{"pmid":"33093444","id":"PMC_33093444","title":"LncRNA MNX1-AS1 promotes progression of intrahepatic cholangiocarcinoma through the MNX1/Hippo axis.","date":"2020","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/33093444","citation_count":33,"is_preprint":false},{"pmid":"10336678","id":"PMC_10336678","title":"The homeodomain transcription factors Islet 1 and HB9 are expressed in adult alpha and gamma motoneurons identified by selective retrograde tracing.","date":"1999","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/10336678","citation_count":33,"is_preprint":false},{"pmid":"29271994","id":"PMC_29271994","title":"Overexpression of lncRNA MNX1-AS1 is associated with poor clinical outcome in epithelial ovarian cancer.","date":"2017","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29271994","citation_count":33,"is_preprint":false},{"pmid":"35953000","id":"PMC_35953000","title":"LncRNA MNX1-AS1 sustains inactivation of Hippo pathway through a positive feedback loop with USP16/IGF2BP3 axis in gallbladder cancer.","date":"2022","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/35953000","citation_count":32,"is_preprint":false},{"pmid":"30697072","id":"PMC_30697072","title":"MNX1-AS1 is a functional oncogene that induces EMT and activates the AKT/mTOR pathway and MNX1 in breast cancer.","date":"2019","source":"Cancer management and research","url":"https://pubmed.ncbi.nlm.nih.gov/30697072","citation_count":32,"is_preprint":false},{"pmid":"28611045","id":"PMC_28611045","title":"RGS12 Is a Novel Tumor-Suppressor Gene in African American Prostate Cancer That Represses AKT and MNX1 Expression.","date":"2017","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/28611045","citation_count":31,"is_preprint":false},{"pmid":"23419452","id":"PMC_23419452","title":"The embryonic transcription factor Hlxb9 is a menin interacting partner that controls pancreatic β-cell proliferation and the expression of insulin regulators.","date":"2013","source":"Endocrine-related cancer","url":"https://pubmed.ncbi.nlm.nih.gov/23419452","citation_count":30,"is_preprint":false},{"pmid":"30012177","id":"PMC_30012177","title":"Motor neuron and pancreas homeobox 1/HLXB9 promotes sustained proliferation in bladder cancer by upregulating CCNE1/2.","date":"2018","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/30012177","citation_count":29,"is_preprint":false},{"pmid":"32754442","id":"PMC_32754442","title":"Long Non-Coding RNA MNX1-AS1 Promotes Progression of Triple Negative Breast Cancer by Enhancing Phosphorylation of Stat3.","date":"2020","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/32754442","citation_count":29,"is_preprint":false},{"pmid":"24095820","id":"PMC_24095820","title":"Novel MNX1 mutations and clinical analysis of familial and sporadic Currarino cases.","date":"2013","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24095820","citation_count":28,"is_preprint":false},{"pmid":"19853743","id":"PMC_19853743","title":"MNX1 (HLXB9) mutations in Currarino patients.","date":"2009","source":"Journal of pediatric surgery","url":"https://pubmed.ncbi.nlm.nih.gov/19853743","citation_count":28,"is_preprint":false},{"pmid":"36476366","id":"PMC_36476366","title":"MNX1-AS1, a c-Myc induced lncRNA, promotes the Warburg effect by regulating PKM2 nuclear translocation.","date":"2022","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/36476366","citation_count":26,"is_preprint":false},{"pmid":"7680402","id":"PMC_7680402","title":"High expression of two diverged homeobox genes, HB24 and HB9, in acute leukemias: molecular markers of hematopoietic cell immaturity.","date":"1993","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/7680402","citation_count":26,"is_preprint":false},{"pmid":"15540222","id":"PMC_15540222","title":"Activation of HLXB9 by juxtaposition with MYB via formation of t(6;7)(q23;q36) in an AML-M4 cell line (GDM-1).","date":"2005","source":"Genes, chromosomes & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/15540222","citation_count":25,"is_preprint":false},{"pmid":"15161049","id":"PMC_15161049","title":"Expression and localization of homeodomain proteins DLX4, HB9 and HB24 in malignant and benign human colorectal tissues.","date":"2004","source":"Anticancer research","url":"https://pubmed.ncbi.nlm.nih.gov/15161049","citation_count":25,"is_preprint":false},{"pmid":"26968460","id":"PMC_26968460","title":"Zebrafish Tg(hb9:MTS-Kaede): a new in vivo tool for studying the axonal movement of mitochondria.","date":"2016","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/26968460","citation_count":24,"is_preprint":false},{"pmid":"24512689","id":"PMC_24512689","title":"Genome-wide identification of Drosophila Hb9 targets reveals a pivotal role in directing the transcriptome within eight neuronal lineages, including activation of nitric oxide synthase and Fd59a/Fox-D.","date":"2014","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/24512689","citation_count":24,"is_preprint":false},{"pmid":"31843814","id":"PMC_31843814","title":"Long Noncoding RNA MNX1 antisense RNA 1 Exerts Oncogenic Functions in Bladder Cancer by Regulating miR-218-5p/RAB1A Axis.","date":"2019","source":"The Journal of pharmacology and experimental therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/31843814","citation_count":23,"is_preprint":false},{"pmid":"24685136","id":"PMC_24685136","title":"The homeodomain transcription factor Hb9 controls axon guidance in Drosophila through the regulation of Robo receptors.","date":"2014","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/24685136","citation_count":23,"is_preprint":false},{"pmid":"30614606","id":"PMC_30614606","title":"MNX1 promotes cell proliferation and activates Wnt/β-catenin signaling in colorectal cancer.","date":"2019","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/30614606","citation_count":21,"is_preprint":false},{"pmid":"30368216","id":"PMC_30368216","title":"Expression, Clinical Significance, and Functional Prediction of MNX1 in Breast Cancer.","date":"2018","source":"Molecular therapy. Nucleic acids","url":"https://pubmed.ncbi.nlm.nih.gov/30368216","citation_count":21,"is_preprint":false},{"pmid":"32850524","id":"PMC_32850524","title":"Increased Expression of microRNA-141-3p Improves Necrotizing Enterocolitis of Neonates Through Targeting MNX1.","date":"2020","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/32850524","citation_count":21,"is_preprint":false},{"pmid":"20393069","id":"PMC_20393069","title":"Sensory modulation of locomotor-like membrane oscillations in Hb9-expressing interneurons.","date":"2010","source":"Journal of neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/20393069","citation_count":20,"is_preprint":false},{"pmid":"16254195","id":"PMC_16254195","title":"Population differences in the polyalanine domain and 6 new mutations in HLXB9 in patients with Currarino syndrome.","date":"2005","source":"Clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16254195","citation_count":20,"is_preprint":false},{"pmid":"34953915","id":"PMC_34953915","title":"MNX1-HNF1B Axis Is Indispensable for Intraductal Papillary Mucinous Neoplasm Lineages.","date":"2021","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/34953915","citation_count":20,"is_preprint":false},{"pmid":"12820413","id":"PMC_12820413","title":"Expression and localization of homeodomain proteins DLX4/HB9 in normal and malignant human breast tissues.","date":"2003","source":"Anticancer research","url":"https://pubmed.ncbi.nlm.nih.gov/12820413","citation_count":20,"is_preprint":false},{"pmid":"21484430","id":"PMC_21484430","title":"The homeobox gene HLXB9 is upregulated in a morphological subset of poorly differentiated hepatocellular carcinoma.","date":"2011","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/21484430","citation_count":19,"is_preprint":false},{"pmid":"30980513","id":"PMC_30980513","title":"Knockdown of lncRNA MNX1-AS1 suppresses cell proliferation, migration, and invasion in prostate cancer.","date":"2019","source":"FEBS open bio","url":"https://pubmed.ncbi.nlm.nih.gov/30980513","citation_count":19,"is_preprint":false},{"pmid":"31118668","id":"PMC_31118668","title":"Expression and significance of LncRNA MNX1-AS1 in non-small cell lung cancer.","date":"2019","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/31118668","citation_count":19,"is_preprint":false},{"pmid":"16434037","id":"PMC_16434037","title":"Forced expression of the motor neuron determinant HB9 in neural stem cells affects neurogenesis.","date":"2006","source":"Experimental neurology","url":"https://pubmed.ncbi.nlm.nih.gov/16434037","citation_count":18,"is_preprint":false},{"pmid":"31210302","id":"PMC_31210302","title":"Long noncoding RNA MNX1-AS1 overexpression promotes the invasion and metastasis of gastric cancer through repressing CDKN1A.","date":"2019","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31210302","citation_count":17,"is_preprint":false},{"pmid":"30093397","id":"PMC_30093397","title":"The homeobox transcription factor HB9 induces senescence and blocks differentiation in hematopoietic stem and progenitor cells.","date":"2018","source":"Haematologica","url":"https://pubmed.ncbi.nlm.nih.gov/30093397","citation_count":17,"is_preprint":false},{"pmid":"17612791","id":"PMC_17612791","title":"Clinical and genetic analysis of HLXB9 gene in Korean patients with Currarino syndrome.","date":"2007","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17612791","citation_count":17,"is_preprint":false},{"pmid":"23094101","id":"PMC_23094101","title":"TTX-resistant NMDA receptor-mediated membrane potential oscillations in neonatal mouse Hb9 interneurons.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23094101","citation_count":17,"is_preprint":false},{"pmid":"18940475","id":"PMC_18940475","title":"MNX1-ETV6 fusion gene in an acute megakaryoblastic leukemia and expression of the MNX1 gene in leukemia and normal B cell lines.","date":"2008","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/18940475","citation_count":17,"is_preprint":false},{"pmid":"34362940","id":"PMC_34362940","title":"Elimination of glutamatergic transmission from Hb9 interneurons does not impact treadmill locomotion.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/34362940","citation_count":16,"is_preprint":false},{"pmid":"35583991","id":"PMC_35583991","title":"An induced pluripotent stem cell t(7;12)(q36;p13) acute myeloid leukemia model shows high expression of MNX1 and a block in differentiation of the erythroid and megakaryocytic lineages.","date":"2022","source":"International journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/35583991","citation_count":16,"is_preprint":false},{"pmid":"33882027","id":"PMC_33882027","title":"LncRNA MNX1-AS1 drives aggressive laryngeal squamous cell carcinoma progression and serves as a ceRNA to target FoxM1 by sponging microRNA-370.","date":"2021","source":"Aging","url":"https://pubmed.ncbi.nlm.nih.gov/33882027","citation_count":15,"is_preprint":false},{"pmid":"35290890","id":"PMC_35290890","title":"LncRNA MNX1-AS1: A novel oncogenic propellant in cancers.","date":"2022","source":"Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie","url":"https://pubmed.ncbi.nlm.nih.gov/35290890","citation_count":15,"is_preprint":false},{"pmid":"19446746","id":"PMC_19446746","title":"Three-way complex translocations in infant acute myeloid leukemia with t(7;12)(q36;p13): the incidence and correlation of a HLXB9 overexpression.","date":"2009","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/19446746","citation_count":15,"is_preprint":false},{"pmid":"1716543","id":"PMC_1716543","title":"Monoclonal antibodies VIB-E3, IB5 and HB9 to the leucocyte/epithelial antigen CD24 resemble BA-1 in recognizing sialic acid-dependent epitope(s). Evidence that VIB-E3 recognizes NeuAc alpha 2-6GalNAc and NeuAc alpha 2-6Gal sequences.","date":"1991","source":"Clinical and experimental immunology","url":"https://pubmed.ncbi.nlm.nih.gov/1716543","citation_count":15,"is_preprint":false},{"pmid":"37317878","id":"PMC_37317878","title":"Aberrant MNX1 expression associated with t(7;12)(q36;p13) pediatric acute myeloid leukemia induces the disease through altering histone methylation.","date":"2024","source":"Haematologica","url":"https://pubmed.ncbi.nlm.nih.gov/37317878","citation_count":14,"is_preprint":false},{"pmid":"21763840","id":"PMC_21763840","title":"Mutation analysis of the motor neuron and pancreas homeobox 1 (MNX1, former HLXB9) gene in Swedish patients with Currarino syndrome.","date":"2011","source":"Journal of pediatric surgery","url":"https://pubmed.ncbi.nlm.nih.gov/21763840","citation_count":14,"is_preprint":false},{"pmid":"23048027","id":"PMC_23048027","title":"Homeobox protein HB9 binds to the prostaglandin E receptor 2 promoter and inhibits intracellular cAMP mobilization in leukemic cells.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23048027","citation_count":14,"is_preprint":false},{"pmid":"30066929","id":"PMC_30066929","title":"MNX1 reduces sensitivity to anoikis by activating TrkB in human glioma cells.","date":"2018","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/30066929","citation_count":14,"is_preprint":false},{"pmid":"24425879","id":"PMC_24425879","title":"GSK-3β protein phosphorylates and stabilizes HLXB9 protein in insulinoma cells to form a targetable mechanism of controlling insulinoma cell proliferation.","date":"2014","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24425879","citation_count":14,"is_preprint":false},{"pmid":"16498628","id":"PMC_16498628","title":"HLXB9 homeobox gene and caudal regression syndrome.","date":"2006","source":"Birth defects research. Part A, Clinical and molecular teratology","url":"https://pubmed.ncbi.nlm.nih.gov/16498628","citation_count":13,"is_preprint":false},{"pmid":"22820079","id":"PMC_22820079","title":"Novel mutations in the MNX1 gene in two families with Currarino syndrome and variable phenotype.","date":"2012","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/22820079","citation_count":13,"is_preprint":false},{"pmid":"34789303","id":"PMC_34789303","title":"LncRNA MNX1-AS1 promotes ovarian cancer process via targeting the miR-744-5p/SOX12 axis.","date":"2021","source":"Journal of ovarian research","url":"https://pubmed.ncbi.nlm.nih.gov/34789303","citation_count":13,"is_preprint":false},{"pmid":"21069786","id":"PMC_21069786","title":"The dual role of HLXB9 in leukemia.","date":"2011","source":"Pediatric blood & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21069786","citation_count":12,"is_preprint":false},{"pmid":"39121370","id":"PMC_39121370","title":"Altered enhancer-promoter interaction leads to MNX1 expression in pediatric acute myeloid leukemia with t(7;12)(q36;p13).","date":"2024","source":"Blood advances","url":"https://pubmed.ncbi.nlm.nih.gov/39121370","citation_count":12,"is_preprint":false},{"pmid":"31436258","id":"PMC_31436258","title":"Motor Neuron and Pancreas Homeobox 1 (MNX1) Is Involved in Promoting Squamous Cervical Cancer Proliferation via Regulating Cyclin E.","date":"2019","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/31436258","citation_count":12,"is_preprint":false},{"pmid":"33312391","id":"PMC_33312391","title":"Clinical effects and molecular mechanisms of lncRNA MNX1-AS1 in malignant tumors.","date":"2020","source":"American journal of translational research","url":"https://pubmed.ncbi.nlm.nih.gov/33312391","citation_count":12,"is_preprint":false},{"pmid":"33821684","id":"PMC_33821684","title":"LncRNA MNX1-AS1 Contributes to Laryngeal Squamous Cell Carcinoma Growth and Migration by Regulating mir-744-5p/bcl9/β-Catenin Axis.","date":"2021","source":"Cell transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/33821684","citation_count":11,"is_preprint":false},{"pmid":"35616155","id":"PMC_35616155","title":"lncRNA MNX1‑AS1 promotes prostate cancer progression through regulating miR‑2113/MDM2 axis.","date":"2022","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/35616155","citation_count":11,"is_preprint":false},{"pmid":"17183586","id":"PMC_17183586","title":"Adult index patient with Currarino syndrome due to a novel HLXB9 mutation, c.336dupG (p.P113fsX224), presenting with Hirschsprung's disease, cephalgia, and lumbodynia.","date":"2007","source":"Birth defects research. Part A, Clinical and molecular teratology","url":"https://pubmed.ncbi.nlm.nih.gov/17183586","citation_count":11,"is_preprint":false},{"pmid":"17960638","id":"PMC_17960638","title":"Graft versus leukemia effect after haploidentical HSCT in a MLL-negative infant AML with HLXB9/ETV6 rearrangement.","date":"2008","source":"Pediatric blood & cancer","url":"https://pubmed.ncbi.nlm.nih.gov/17960638","citation_count":11,"is_preprint":false},{"pmid":"15088182","id":"PMC_15088182","title":"[Currarino syndrome: variability of imaging findings in 22 molecular-genetically identified (HLXB9 mutation) patients from five families].","date":"2004","source":"RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin","url":"https://pubmed.ncbi.nlm.nih.gov/15088182","citation_count":11,"is_preprint":false},{"pmid":"31364121","id":"PMC_31364121","title":"Long non-coding RNA MNX1-AS1 promoted osteosarcoma proliferation and invasion via inhibiting KISS1.","date":"2019","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31364121","citation_count":10,"is_preprint":false},{"pmid":"35152841","id":"PMC_35152841","title":"Actinidia chinensis Planch Root extract suppresses the growth and metastasis of hypopharyngeal carcinoma by inhibiting E2F Transcription Factor 1-mediated MNX1 antisense RNA 1.","date":"2022","source":"Bioengineered","url":"https://pubmed.ncbi.nlm.nih.gov/35152841","citation_count":10,"is_preprint":false},{"pmid":"32850410","id":"PMC_32850410","title":"MNX1 Promotes Malignant Progression of Cervical Cancer via Repressing the Transcription of p21cip1.","date":"2020","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/32850410","citation_count":10,"is_preprint":false},{"pmid":"15338230","id":"PMC_15338230","title":"Localization of HB9 homeodomain protein and characterization of its nuclear localization signal during chick embryonic skin development.","date":"2004","source":"Histochemistry and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15338230","citation_count":9,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49009,"output_tokens":7753,"usd":0.131661},"stage2":{"model":"claude-opus-4-6","input_tokens":11553,"output_tokens":4084,"usd":0.239797},"total_usd":0.371458,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"HB9 (MNX1) is a homeodomain transcription factor essential for consolidating motor neuron identity; in mice lacking Hb9, postmitotic motor neurons transiently acquire molecular features of V2 interneurons, and motor neuron migration, subtype identity, and axonal projection are all defective.\",\n      \"method\": \"Genetic knockout (loss-of-function) with defined cellular and axonal phenotypic readouts in mouse embryos\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal genetic evidence from two independent labs (PMID:10482234 and PMID:10482235) with multiple orthogonal readouts\",\n      \"pmids\": [\"10482234\", \"10482235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"HB9 (MNX1) actively suppresses interneuron genetic programs (e.g., Chx10) within postmitotic motor neurons to establish motor neuron identity, as revealed by upregulation of interneuron genes in Hb9 null mice.\",\n      \"method\": \"Genetic knockout with gene expression analysis (loss-of-function)\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined molecular phenotype, replicated independently\",\n      \"pmids\": [\"10482235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Hlxb9 (MNX1) is required for the initiation of the dorsal pancreatic program; in Hlxb9-null mice, dorsal gut epithelium fails to initiate pancreatic differentiation, while ventral pancreatic development proceeds with later defects in beta-cell differentiation and islet organization.\",\n      \"method\": \"Genetic knockout (loss-of-function) with histological and molecular analysis of pancreatic development\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — independently replicated in two simultaneous papers (PMID:10471501 and PMID:10471502) with clean KO and multiple phenotypic readouts\",\n      \"pmids\": [\"10471501\", \"10471502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Hlxb9 (MNX1) null mice show dorsal pancreas agenesis and islets of Langerhans with reduced beta-cells that express low levels of Glut2 and Nkx6-1, indicating a role for MNX1 in beta-cell differentiation and function.\",\n      \"method\": \"Genetic knockout with immunohistochemistry and gene expression analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple molecular and functional readouts\",\n      \"pmids\": [\"10471502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Persistent (temporally extended) expression of Hlxb9 in the pancreatic epithelium beyond its normal transient window impairs pancreatic morphogenesis, reduces endocrine and exocrine differentiation, and redirects the epithelium toward an intestinal-like fate, demonstrating tight temporal regulation of MNX1 is essential.\",\n      \"method\": \"Transgenic overexpression driven by Ipf1/Pdx1 promoter with histological and molecular analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — transgenic gain-of-function with clear phenotypic consequence and molecular characterization\",\n      \"pmids\": [\"11784060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Patient-specific heterozygous mutations in the HLXB9 homeobox gene (missense mutations clustered in the homeodomain and truncating mutations) cause autosomal dominant Currarino syndrome (hereditary sacral agenesis), establishing HLXB9 as the disease locus at 7q36.\",\n      \"method\": \"Mutation analysis (Sanger sequencing) in familial and sporadic patients combined with linkage analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple independent families, multiple mutation types, strong genetic evidence\",\n      \"pmids\": [\"9843207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"HLXB9 missense mutations causing Currarino syndrome are significantly clustered in the homeodomain, resulting in non-conservative substitution of highly conserved residues, indicating the homeodomain DNA-binding function is critical; HLXB9 is expressed in the basal plate of the developing spinal cord/hindbrain and in pharynx, esophagus, stomach, and pancreas during human embryogenesis.\",\n      \"method\": \"Mutation survey (Sanger sequencing in 22 index patients) and in situ hybridization for expression analysis during human development (Carnegie stages 12–21)\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large cohort mutation study with direct expression localization\",\n      \"pmids\": [\"10749657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"A fusion transcript of HLXB9 (exon 1) and ETV6 (exons 2 or 3) is generated by t(7;12)(q36;p13) in infant AML; RT-PCR showed two alternative splice forms of the HLXB9-ETV6 fusion, and the reciprocal ETV6-HLXB9 transcript was not detected, implicating either the fusion protein or disrupted ETV6 in leukemogenesis.\",\n      \"method\": \"RT-PCR with sequence analysis in AML patient samples carrying t(7;12)\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single method (RT-PCR) in patient samples, foundational identification of fusion\",\n      \"pmids\": [\"11454678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In Hodgkin lymphoma cells, HLXB9 directly activates IL6 transcription (demonstrated by antisense knockdown, forced expression, and IL6 promoter reporter assays), and HLXB9 expression itself is regulated by the PI3K pathway, likely via E2F3.\",\n      \"method\": \"Antisense oligonucleotide knockdown, forced overexpression, luciferase reporter assay with IL6 promoter, PI3K/AKT pathway inhibition experiments\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a single study, single lab\",\n      \"pmids\": [\"15772702\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"HLXB9 ectopic expression in AML-M4 cell line GDM-1 results from juxtaposition with upstream regions of MYB through the translocation t(6;7)(q23;q36), establishing a novel mechanism of HLXB9 activation via enhancer hijacking from MYB.\",\n      \"method\": \"RT-PCR expression screening, karyotypic analysis, FISH mapping of chromosomal breakpoints\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — FISH and expression analysis in defined cell line model\",\n      \"pmids\": [\"15540222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"In C. elegans, UNC-4 and its co-repressor UNC-37/Groucho repress CEH-12/HB9 in VA motor neurons; when CEH-12/HB9 is ectopically expressed in VAs, they adopt VB-type synaptic inputs, demonstrating that HB9 family proteins define synaptic partner choice downstream of UNC-4.\",\n      \"method\": \"Cell-specific microarray, genetic epistasis, and expression analysis in C. elegans\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell-specific microarray plus genetic epistasis with defined functional readout (synaptic input specificity)\",\n      \"pmids\": [\"17289921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Hb9 interneurons in the mouse spinal cord are electrotonically coupled to a heterogeneous network of non-Hb9 interneurons (gap junction coupling shown by carbenoxolone blockade and calcium imaging); they exhibit bursting activity synchronous with rhythmic ventral root output even when fast chemical synaptic transmission is blocked.\",\n      \"method\": \"Two-photon calcium imaging, paired whole-cell patch-clamp, pharmacological gap junction blockade in postnatal mouse spinal cord\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal electrophysiological and imaging methods\",\n      \"pmids\": [\"17715199\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Persistent sodium current (INaP) contributes to locomotor-related membrane voltage oscillations in Hb9 interneurons independently of fast glutamatergic, GABAergic, and glycinergic synaptic inputs; riluzole blockade of slow-inactivating sodium current suppressed oscillation amplitude and frequency.\",\n      \"method\": \"Pharmacological dissection (CNQX, riluzole, glycine/GABA receptor antagonists) combined with whole-cell patch-clamp in Hb9:eGFP transgenic mice\",\n      \"journal\": \"Journal of neurophysiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple pharmacological methods with clear mechanistic interpretation\",\n      \"pmids\": [\"18667543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Hb9 interneurons are rhythmically active during fictive locomotion in intact neonatal mouse spinal cord, but their activity onset lags behind ipsilateral ventral root bursts (mean phase ~0.21–0.28), indicating they are not the sole intrasegmental rhythm-generating kernel of the CPG.\",\n      \"method\": \"Two-photon calcium imaging in intact spinal cord with subsequent immunostaining for genetic identification, confirmed by whole-cell recordings\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — two orthogonal methods (imaging + electrophysiology) with genetic identification\",\n      \"pmids\": [\"19759307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In zebrafish, mnx1 (hb9) functions downstream of retinoic acid signaling in the endoderm to control cell fate decisions in the endocrine pancreas progenitor lineage; Mnx1-deficient zebrafish lack beta-cells and concomitantly gain alpha-cells, showing that Mnx1 promotes beta-cell and suppresses alpha-cell fate.\",\n      \"method\": \"Gene knockdown, cell transplantation, transgenic reporter analysis in zebrafish\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal approaches (KD, transplantation, reporters) with clear fate-switch readout\",\n      \"pmids\": [\"21989909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PTF1a directly binds a distant enhancer element of the Mnx1 locus in pancreas progenitors and promotes Mnx1 expression; this was demonstrated by ChIP-sequencing and RNA profiling, establishing Mnx1 as a major direct target of PTF1a in the pancreas progenitor transcription factor network.\",\n      \"method\": \"RNA profiling and ChIP-sequencing (ChIP-seq) in pancreas progenitors\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP-seq with RNA profiling, direct demonstration of PTF1a binding to Mnx1 enhancer\",\n      \"pmids\": [\"22232429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In zebrafish, the hb9/mnx1 beta-cell progenitor-specific enhancer contains paired-box transcription factor binding sites and E-boxes; EMSA studies showed Pax6b and NeuroD interact with these elements, and genetic analysis showed Pax6b is required for maintenance (but not induction) of pancreatic hb9 transcription.\",\n      \"method\": \"Enhancer reporter transgenic analysis, EMSA, genetic epistasis (pax6b mutants) in zebrafish\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — EMSA (direct binding) combined with transgenic and genetic approaches\",\n      \"pmids\": [\"22426004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HB9 binds directly to the PTGER2 (prostaglandin E receptor 2) promoter via its functional homeodomain; HB9 binding requires both the homeodomain and the HB9-binding domain in the PTGER2 promoter, leading to transcriptional repression of PTGER2 and reduced intracellular cAMP in hematopoietic cells. Overall HB9 acts predominantly as a transcriptional repressor (78% of significantly regulated target genes are downregulated) with target enrichment in cell-adhesion and cell-cell interaction pathways.\",\n      \"method\": \"ChIP-on-chip, luciferase reporter assay, expression profiling, cAMP functional assay in HL-60 cells and t(7;12) patient bone marrow\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — ChIP-on-chip plus reporter assay plus mutagenesis of binding domain plus functional cAMP readout\",\n      \"pmids\": [\"23048027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hlxb9 interacts physically with menin (encoded by MEN1) in pancreatic beta-cells; upon menin knockdown, Hlxb9 is post-transcriptionally upregulated, reduces cell proliferation, and causes apoptosis in the presence of menin, and regulates genes controlling insulin levels.\",\n      \"method\": \"Co-immunoprecipitation (binding interaction), menin knockdown, cell proliferation and apoptosis assays in MIN6 beta-cell line\",\n      \"journal\": \"Endocrine-related cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, Co-IP plus functional assays but limited mechanistic depth\",\n      \"pmids\": [\"23419452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"GSK-3β phosphorylates HLXB9 at Ser-78/Ser-80, stabilizing it predominantly in the nucleus; phospho-HLXB9 (pHLXB9) and active GSK-3β are elevated in insulinoma cells and human sporadic insulinomas, and pharmacologic GSK-3β inhibition blocks insulinoma cell proliferation by G2/M arrest and apoptosis.\",\n      \"method\": \"Site-directed mutagenesis of phosphorylation sites, Western blotting, pharmacological GSK-3β inhibition, cell cycle and apoptosis analysis in rodent insulinoma cell lines and human tumor samples\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — site mutagenesis confirming phosphorylation sites plus in vitro and in vivo functional validation\",\n      \"pmids\": [\"24425879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Homozygous loss-of-function mutations in MNX1 cause permanent neonatal diabetes in humans, confirming MNX1 as an etiological gene for human pancreatic beta-cell development; the causal mutation (p.Phe272Leu) is located within the MNX1 homeodomain helix 2, and MNX1 is enriched in human embryonic pancreatic epithelium compared with mesenchyme.\",\n      \"method\": \"Homozygosity mapping, Sanger sequencing in consanguineous patients, expression analysis in human embryonic pancreatic tissue\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple independent patients with recessive mutations plus expression localization in human tissue\",\n      \"pmids\": [\"24411943\", \"23562494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Conditional inactivation of Mnx1 in endocrine progenitors or embryonic beta-cells reveals that Mnx1 promotes beta-cell while suppressing delta-cell differentiation programs; loss of Mnx1 in embryonic beta-cells leads to postnatal beta-to-delta-like transdifferentiation, and beta-cells escaping Mnx1 inactivation upregulate Mnx1 and undergo persistent proliferation.\",\n      \"method\": \"Conditional genetic knockout (stage-specific Cre-lox), lineage tracing, longitudinal histological and functional analysis in mice\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple temporal stages, lineage tracing, and functional islet assays\",\n      \"pmids\": [\"26534984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MNX1 upregulates lipid synthesis by stimulating expression of SREBP1 and fatty acid synthase (FASN) in prostate cancer cells; both androgen and AKT signaling pathways increase MNX1 expression.\",\n      \"method\": \"Gene expression analysis, pathway inhibition experiments, overexpression/knockdown in prostate cancer cell lines\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, functional experiments without direct ChIP evidence for SREBP1 promoter binding\",\n      \"pmids\": [\"27578002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RGS12 tumor suppressor negatively regulates MNX1 expression by decreasing AKT activity; RGS12 expression correlates negatively with MNX1, and RGS12 knockdown increases MNX1 levels, establishing an RGS12-AKT-MNX1 oncogenic axis in African-American prostate cancer.\",\n      \"method\": \"Loss-of-function (RGS12 knockdown/KO) with expression analysis in vitro and in vivo xenograft models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, correlation with functional validation but indirect mechanism\",\n      \"pmids\": [\"28611045\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MNX1 transcriptionally upregulates CCNE1 (Cyclin E1) and CCNE2 (Cyclin E2) by directly binding to their promoters, promoting G1-S cell cycle transition in bladder cancer cells.\",\n      \"method\": \"ChIP assay demonstrating direct promoter binding, real-time PCR, Western blotting, cell cycle analysis; in vitro and in vivo (xenograft) functional experiments\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct ChIP evidence plus functional phenotype, single lab\",\n      \"pmids\": [\"30012177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HB9 expression in human hematopoietic stem and progenitor cells induces premature senescence via the p53-p21 tumor suppressor network and causes a myeloid-biased differentiation arrest at the megakaryocyte/erythrocyte progenitor stage in vivo.\",\n      \"method\": \"Retroviral transduction in human HT1080 and NIH3T3 cells (senescence assays), murine HSPC transplantation (in vivo differentiation), gene expression profiling in human CD34+ cells\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell systems and in vivo model, single lab\",\n      \"pmids\": [\"30093397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MNX1 functions as a transcriptional activator of TrkB by binding its upstream regulatory region, thereby promoting anoikis resistance in glioma cells.\",\n      \"method\": \"RT-PCR, Western blotting, adhesion assay, overexpression/knockdown experiments, transcription factor binding assay (upstream region)\",\n      \"journal\": \"Molecular medicine reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, promoter binding without formal ChIP confirmation\",\n      \"pmids\": [\"30066929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MNX1 activates Wnt/β-catenin signaling in colorectal cancer cells, upregulating downstream targets c-Myc and CCND1, as shown by luciferase reporter analysis.\",\n      \"method\": \"Luciferase reporter assay (Wnt/β-catenin), overexpression/knockdown, Western blotting in colorectal cancer cells\",\n      \"journal\": \"Cell biology international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, reporter assay without direct mechanistic target identification\",\n      \"pmids\": [\"30614606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MNX1 protein is expressed in beta-cells and promotes their proliferation; in the MNX1-AS1/c-Myc context, MNX1-AS1 promotes expression of MNX1 (sense transcript) in ICC via recruitment of transcription factors c-Myc and MAZ to the MNX1 promoter, and MNX1 in turn upregulates Ajuba to suppress the Hippo signaling pathway.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) showing c-Myc and MAZ binding to MNX1 promoter; MNX1 ChIP on Ajuba promoter; functional assays in ICC cell lines and xenograft models\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP evidence for direct promoter binding plus functional pathway validation, single lab\",\n      \"pmids\": [\"33093444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MNX1 transcriptionally represses p21cip1 (CDKN1A) by binding its promoter, thereby accelerating G1/S cell cycle transition in cervical cancer cells.\",\n      \"method\": \"ChIP assay (direct promoter binding), luciferase reporter assay, flow cytometry (cell cycle), overexpression/knockdown with RTCA and xenograft in vivo\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and reporter assay demonstrating direct transcriptional repression, single lab\",\n      \"pmids\": [\"32850410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Chromatin conformation and accessibility analyses in pancreatic organoids show that MNX1 and HNF1B form a biologically indispensable axis in IPMN lineages, governing a target gene set including MYC, SOX9, and OLFM4; MNX1 upregulation is specifically marked in human IPMN lineage tissues.\",\n      \"method\": \"ATAC-seq, ChIP-seq, Hi-C (chromosome conformation capture), shRNA/CRISPRi functional assays in human organoids derived from IPMN/PDAC\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal genomic methods plus functional validation in organoids\",\n      \"pmids\": [\"34953915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Elimination of vesicular glutamate transporter 2 (VGLUT2) from Hb9 interneurons in mice using an inducible Cre line causes no deficits in treadmill locomotion, indicating that glutamatergic neurotransmission from Hb9 interneurons is dispensable for locomotor behavior.\",\n      \"method\": \"Conditional genetic knockout of VGLUT2 in Hb9 interneurons using inducible Cre recombinase; treadmill locomotion behavioral testing\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean conditional KO with specific behavioral readout; refines circuit model\",\n      \"pmids\": [\"34362940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Retroviral expression of MNX1 alone induces AML in immune-incompetent mice from fetal (but not adult) hematopoietic stem and progenitor cells; MNX1 increases H3K4 mono/di/trimethylation and reduces H3K27me3, alters genome-wide chromatin accessibility, and interacts with the methionine cycle and methyltransferases. Pre-treatment with the SAM analog Sinefungin prevents AML development, implicating histone methylation as the key oncogenic mechanism.\",\n      \"method\": \"Retroviral MNX1 expression in fetal vs. adult murine HSPCs with transplantation, ChIP for histone marks, ATAC-seq, gene expression profiling, co-IP with methyltransferases, pharmacological inhibition (Sinefungin)\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — in vivo leukemia induction model plus multiple epigenomic methods and mechanistic rescue experiment\",\n      \"pmids\": [\"37317878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In t(7;12)(q36;p13) AML, the translocation breaks proximal to MNX1 and within introns 1 or 2 of ETV6, causing enhancer hijacking that drives aberrant MNX1 overexpression in hematopoietic cells, as demonstrated by chromatin interaction assays in an iPSC t(7;12) model.\",\n      \"method\": \"Breakpoint mapping, ATAC-seq, chromatin conformation capture (Hi-C-like assays) in iPSC t(7;12) model\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — chromatin interaction assay directly demonstrates enhancer hijacking mechanism in iPSC model\",\n      \"pmids\": [\"39121370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HB9 protein contains two functional nuclear localization signal (NLS) sequences within its homeodomain: one bipartite type (resembling Xenopus nucleoplasmin NLS) and one hexapeptide type (similar to PDX1 NLS); both are sufficient for nuclear import in primary keratinocytes and dermal fibroblasts. HB9 protein localizes to both nucleus and cytoplasm (ER and Golgi) in a tissue-context-dependent manner.\",\n      \"method\": \"GFP fusion protein nuclear import assay in primary keratinocyte culture; immunofluorescence; immunoelectron microscopy\",\n      \"journal\": \"Histochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct NLS characterization with GFP fusion functional assay, single lab\",\n      \"pmids\": [\"15338230\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MNX1 (HB9/HLXB9) encodes a homeodomain transcription factor that acts primarily as a transcriptional repressor to consolidate motor neuron identity (by suppressing interneuron programs) and as an activator/repressor to specify dorsal pancreatic fate and beta-cell identity (promoting beta- and suppressing alpha/delta-cell programs); its homeodomain mediates DNA binding and nuclear import, and it is post-translationally regulated by GSK-3β phosphorylation at Ser-78/Ser-80; in leukemia, ectopic MNX1 expression driven by chromosomal translocation-mediated enhancer hijacking causes AML by altering histone methylation (H3K4me and H3K27me3) and repressing a broad target gene set including PTGER2 and cell-adhesion genes.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MNX1 (HB9/HLXB9) encodes a homeodomain transcription factor that functions primarily as a transcriptional repressor to consolidate cell identity in motor neurons and pancreatic endocrine lineages. In the developing spinal cord, MNX1 suppresses interneuron genetic programs (e.g., Chx10) in postmitotic motor neurons, and its loss causes motor neurons to transiently acquire V2 interneuron features with defective migration and axonal projection [PMID:10482234, PMID:10482235]; in the pancreas, MNX1 is required for dorsal pancreas initiation and beta-cell differentiation, actively promoting beta-cell fate while suppressing alpha- and delta-cell programs, with loss-of-function mutations causing permanent neonatal diabetes in humans and heterozygous homeodomain mutations causing autosomal dominant Currarino syndrome [PMID:10471501, PMID:24411943, PMID:9843207, PMID:26534984]. MNX1 binds target gene promoters via its homeodomain to repress genes including PTGER2 and CDKN1A and activate targets including CCNE1/CCNE2, is post-translationally stabilized in the nucleus by GSK-3β phosphorylation at Ser-78/Ser-80, and is regulated upstream by PTF1a, Pax6b, and the PI3K/AKT pathway [PMID:23048027, PMID:24425879, PMID:22232429, PMID:30012177]. In hematopoietic cells, chromosomal translocations drive ectopic MNX1 expression through enhancer hijacking, and MNX1 induces AML from fetal hematopoietic progenitors by broadly increasing H3K4 methylation and reducing H3K27me3, a mechanism blocked by the SAM analog Sinefungin [PMID:37317878, PMID:39121370].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing MNX1 as a disease gene: heterozygous mutations in the HLXB9 homeodomain were identified as causative for Currarino syndrome, linking the gene's DNA-binding domain to human caudal developmental defects.\",\n      \"evidence\": \"Sanger sequencing and linkage analysis in familial and sporadic Currarino syndrome patients\",\n      \"pmids\": [\"9843207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which haploinsufficiency causes sacral agenesis is unknown\", \"No animal model recapitulating Currarino phenotype was available\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Knockout studies simultaneously established MNX1 as essential for two distinct developmental programs—motor neuron identity consolidation (by repressing interneuron genes) and dorsal pancreas initiation/beta-cell differentiation—revealing it as a cell-fate selector in both neural and endocrine lineages.\",\n      \"evidence\": \"Independent Hb9/Hlxb9 knockout mouse studies with histological, molecular, and axonal phenotyping\",\n      \"pmids\": [\"10482234\", \"10482235\", \"10471501\", \"10471502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets were not identified\", \"Whether MNX1 acts as activator or repressor was unresolved\", \"Mechanism of V2 interneuron gene derepression unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Two new dimensions of MNX1 biology emerged: temporal regulation proved critical for pancreatic morphogenesis (persistent expression redirects epithelium to intestinal fate), and the HLXB9-ETV6 fusion transcript from t(7;12) was identified in infant AML, implicating MNX1 in leukemogenesis.\",\n      \"evidence\": \"Transgenic overexpression via Pdx1 promoter in mice; RT-PCR fusion transcript detection in AML patient samples\",\n      \"pmids\": [\"11784060\", \"11454678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the fusion protein or ectopic wild-type MNX1 drives leukemogenesis was unclear\", \"Mechanism of pancreatic-to-intestinal fate switch was not molecularly defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The homeodomain of MNX1 was shown to harbor two functional nuclear localization signals sufficient for nuclear import, explaining how homeodomain mutations could disrupt both DNA binding and subcellular targeting.\",\n      \"evidence\": \"GFP-NLS fusion import assays in primary keratinocytes; immunoelectron microscopy\",\n      \"pmids\": [\"15338230\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context-dependent cytoplasmic localization (ER/Golgi) was observed but unexplained\", \"No confirmation in motor neurons or beta-cells\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"MNX1 was linked to transcriptional activation of IL6 in Hodgkin lymphoma and shown to be ectopically activated via enhancer hijacking from MYB in AML, broadening its oncogenic roles beyond t(7;12).\",\n      \"evidence\": \"Antisense knockdown plus forced expression plus IL6 promoter reporter; FISH breakpoint mapping in GDM-1 cell line\",\n      \"pmids\": [\"15772702\", \"15540222\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MNX1 binding to IL6 promoter not demonstrated by ChIP\", \"Enhancer hijacking mechanism not confirmed at chromatin level\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"In C. elegans, the HB9 ortholog CEH-12 was shown to specify synaptic partner choice in motor neurons downstream of UNC-4/Groucho repression, extending the conserved role of HB9 family members in motor neuron subtype identity to synaptic connectivity.\",\n      \"evidence\": \"Cell-specific microarray, genetic epistasis, and synaptic input specificity assays in C. elegans\",\n      \"pmids\": [\"17289921\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mammalian HB9 similarly specifies synaptic input choice is untested\", \"Direct transcriptional targets of CEH-12 mediating synaptic specificity unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Hb9-expressing spinal interneurons were characterized as rhythmically active neurons electrotonically coupled to heterogeneous networks via gap junctions, with persistent sodium current (INaP) driving locomotor-related oscillations, defining their electrophysiological properties within the locomotor central pattern generator.\",\n      \"evidence\": \"Two-photon calcium imaging, paired patch-clamp, pharmacological dissection (carbenoxolone, riluzole) in Hb9:eGFP transgenic mice\",\n      \"pmids\": [\"17715199\", \"18667543\", \"19759307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hb9 interneuron activity lags ventral root bursts, so their precise role in rhythm generation remains debated\", \"Glutamatergic output from Hb9 interneurons was later shown dispensable for locomotion (PMID:34362940)\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Zebrafish studies resolved MNX1's pancreatic function as a binary fate switch: Mnx1 promotes beta-cell and suppresses alpha-cell fate downstream of retinoic acid signaling in the endoderm, establishing a cell-autonomous role.\",\n      \"evidence\": \"Gene knockdown, cell transplantation, transgenic reporter analysis in zebrafish\",\n      \"pmids\": [\"21989909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream transcriptional targets mediating the alpha-to-beta switch not identified\", \"Whether this is direct transcriptional repression of alpha-cell genes was unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The upstream regulation and direct target repertoire of MNX1 were defined: PTF1a directly binds an Mnx1 enhancer in pancreas progenitors, Pax6b/NeuroD maintain pancreatic Mnx1 expression, and MNX1 acts predominantly as a transcriptional repressor (78% of targets downregulated) with direct homeodomain-dependent repression of PTGER2 and enrichment for cell-adhesion gene targets.\",\n      \"evidence\": \"ChIP-seq for PTF1a; EMSA for Pax6b/NeuroD; ChIP-on-chip, luciferase reporter, and cAMP assays for PTGER2 repression in HL-60/patient cells\",\n      \"pmids\": [\"22232429\", \"22426004\", \"23048027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full genome-wide direct target map in motor neurons absent\", \"Co-repressor complexes mediating repression not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Post-translational regulation of MNX1 was established: GSK-3β phosphorylates Ser-78/Ser-80, stabilizing MNX1 in the nucleus; this mechanism is hyperactivated in insulinomas. Separately, homozygous loss-of-function MNX1 mutations were identified as a cause of permanent neonatal diabetes, confirming MNX1's essential role in human beta-cell development.\",\n      \"evidence\": \"Site-directed mutagenesis of phosphorylation sites, pharmacological GSK-3β inhibition in insulinoma cells; homozygosity mapping and sequencing in consanguineous PNDM patients\",\n      \"pmids\": [\"24425879\", \"24411943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether phosphorylation affects DNA-binding affinity or co-factor recruitment unknown\", \"Mechanism linking homeodomain F272L mutation to beta-cell failure not characterized\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Conditional knockout studies revealed that MNX1 is required not only for initial beta-cell specification but also for maintaining beta-cell identity postnatally, as loss leads to beta-to-delta-like transdifferentiation, while escapee beta-cells upregulate Mnx1 and proliferate.\",\n      \"evidence\": \"Stage-specific conditional Cre-lox knockout with lineage tracing and functional islet assays in mice\",\n      \"pmids\": [\"26534984\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct targets maintaining beta-cell vs. delta-cell identity not defined\", \"Whether human beta-cells undergo similar transdifferentiation upon MNX1 loss unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"MNX1's oncogenic transcriptional activity was extended to multiple cancers: it directly binds and activates CCNE1/CCNE2 promoters to drive G1-S transition in bladder cancer and represses CDKN1A (p21) in cervical cancer, while in hematopoietic progenitors it induces senescence via p53-p21.\",\n      \"evidence\": \"ChIP assays for CCNE1/CCNE2 and CDKN1A promoter binding; retroviral MNX1 expression in HSPCs with in vivo transplantation; cell cycle analysis\",\n      \"pmids\": [\"30012177\", \"32850410\", \"30093397\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Context-dependent switch between senescence induction and proliferation promotion unresolved\", \"Co-factors determining activator vs. repressor function at different promoters unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"MNX1 was positioned within a chromatin regulatory network in pancreatic neoplasia: in IPMN organoids, MNX1 and HNF1B form a functionally indispensable axis governing MYC, SOX9, and OLFM4 expression, and glutamatergic output from Hb9 spinal interneurons was shown dispensable for locomotion.\",\n      \"evidence\": \"ATAC-seq, ChIP-seq, Hi-C, CRISPRi in human IPMN/PDAC organoids; conditional VGLUT2 knockout in Hb9 interneurons with behavioral testing\",\n      \"pmids\": [\"34953915\", \"34362940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MNX1 directly binds SOX9/OLFM4 regulatory regions or acts indirectly unresolved\", \"Non-glutamatergic signaling mechanisms of Hb9 interneurons in locomotion undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The leukemogenic mechanism of ectopic MNX1 was resolved: MNX1 alone induces AML from fetal HSPCs by broadly increasing H3K4me1/2/3 and reducing H3K27me3 through interaction with methyltransferases, and t(7;12) was confirmed to cause enhancer hijacking driving MNX1 overexpression via chromatin interaction assays.\",\n      \"evidence\": \"Retroviral MNX1 expression in fetal/adult HSPCs with transplantation, histone ChIP, ATAC-seq, co-IP with methyltransferases, Sinefungin rescue; breakpoint mapping, Hi-C in iPSC t(7;12) model\",\n      \"pmids\": [\"37317878\", \"39121370\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific methyltransferase(s) mediating MNX1-dependent H3K4 methylation not individually identified\", \"Why fetal but not adult HSPCs are susceptible is mechanistically unexplained\", \"Whether enhancer hijacking model applies to all t(7;12) AML patients unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include: the co-repressor/co-activator complexes through which MNX1 exerts context-dependent transcriptional regulation; the direct target gene network in motor neurons; the structural basis for homeodomain mutations causing Currarino syndrome vs. neonatal diabetes; and the developmental window dependency of MNX1 leukemogenicity.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No co-repressor complex identified for MNX1 in any system\", \"No crystal structure of MNX1 homeodomain–DNA complex available\", \"Genome-wide direct target map in motor neurons absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [5, 6, 17, 24, 29, 34]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1, 2, 4, 8, 14, 17, 21, 24, 29, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [19, 34]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1, 2, 3, 10, 14, 21]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 17, 24, 29, 30]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [24, 29]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [7, 9, 32, 33]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [32]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MEN1\", \"PTF1A\", \"PAX6B\", \"GSK3B\", \"HNF1B\"],\n    \"other_free_text\": []\n  }\n}\n```"}