{"gene":"HOXA5","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1989,"finding":"HOXA5 (Hox-1.3) protein is a nuclear phosphoprotein that binds specific DNA sequences via its homeodomain; DNase I footprinting identified a binding site 144 bp upstream of the Hox-1.3 transcription start, and the consensus binding motif CPyPyNATTAT/GPy was deduced; base substitutions in the core ATTA sequence abolished binding.","method":"DNase I footprinting, electrophoretic mobility shift assay (EMSA), in vitro DNA binding with synthetic oligonucleotides, subcellular fractionation","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical assay with mutagenesis validating sequence-specific DNA binding","pmids":["2565857"],"is_preprint":false},{"year":1991,"finding":"Targeted disruption of Hoxa5 (Hox-1.5) in mice causes perinatal lethality with athymia, aparathyroidism, reduced thyroid and submaxillary tissue, heart/artery defects, and craniofacial abnormalities, establishing Hoxa5 as required for pharyngeal arch and neural crest-derived organ development.","method":"Gene targeting in embryonic stem cells, mouse knockout","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined multi-organ phenotypic readout, foundational paper, highly cited","pmids":["1673020"],"is_preprint":false},{"year":1993,"finding":"Loss of Hoxa5 function in mice causes homeotic transformations restricted to cervical vertebra C3 through thoracic vertebra T2, demonstrating Hoxa5 specifies regional axial identity in the cervicothoracic skeleton; the most frequent anomaly is posterior transformation of C7 into a rib-bearing thoracic vertebra.","method":"Targeted mutagenesis in embryonic stem cells, skeletal analysis of Hoxa5-/- mice","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined skeletal phenotype and regional specificity","pmids":["7901120"],"is_preprint":false},{"year":1993,"finding":"Mouse Hox-a5 is functionally equivalent to Drosophila Sex combs reduced (Scr): ectopic expression of Hox-a5 in Drosophila induces Scr-like homeotic transformations and activates the Scr target gene fork head, demonstrating direct participation in a regulatory hierarchy.","method":"Transgenic Drosophila overexpression, phenotypic analysis, target gene (fork head) expression assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 — functional reconstitution in vivo with target gene activation, replicated across tissues","pmids":["8095481"],"is_preprint":false},{"year":1996,"finding":"Functional dissection of Hox-a5 showed: (1) the homeodomain is essential for nuclear targeting and protein function; (2) the N-terminal region contributes to transcriptional activation and transformation potential but not functional specificity; (3) the YPWM motif is essential for biological specificity and mediates interaction with co-factor Pbx1 in vitro.","method":"Truncation mutagenesis, transactivation assays in cultured cells, transgenic Drosophila functional assays, in vitro Pbx1 interaction","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with mutagenesis, multiple orthogonal assays in one study","pmids":["8635464"],"is_preprint":false},{"year":1998,"finding":"HOXA5 and HOXB7 are expressed in cerebellar Purkinje cells and synergistically activate the Purkinje cell-specific pcp-2(L7) promoter via TAAT-containing sequence elements (L7ATE), as shown by co-transfection assays.","method":"RT-PCR cloning, co-transfection transcriptional activation assays","journal":"Journal of neurobiology","confidence":"Medium","confidence_rationale":"Tier 3 — single-lab co-transfection assay without in vivo validation of direct binding","pmids":["9740027"],"is_preprint":false},{"year":1998,"finding":"Hoxa5 homeotic transformations of the cervicothoracic skeleton are confined to C3–T2, corresponding to the major transcript domain; Cdx/Hoxa4 mutations alter Hoxa5 expression in cis in the cervicothoracic prevertebral column, and compound Hoxa4/Hoxa5 heterozygotes show Hoxa5-like transformations, demonstrating transcriptional interference and regional autoregulation.","method":"Genetic epistasis in compound mutant mice, in situ hybridization","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with compound mutants and expression analysis","pmids":["9603431"],"is_preprint":false},{"year":1999,"finding":"Constitutive expression of HOXA5 in human CD34+ hematopoietic progenitors inhibits erythropoiesis and promotes myelopoiesis, diverting differentiation at a multipotent progenitor stage; erythroid progenitor (BFU-E) frequency was significantly reduced with no change in total CFU numbers.","method":"Retroviral transduction of CD34+ and CD34+CD38- cells, immunophenotyping, morphological analysis, clonal analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — clean gain-of-function with defined differentiation phenotype, multiple readouts","pmids":["10397719"],"is_preprint":false},{"year":2000,"finding":"HOXA5 transcriptionally activates the p53 promoter; transient transfection of HOXA5 activated the p53 promoter, and HOXA5 expression in wild-type p53 (but not p53-null) breast cancer cells induced apoptosis; coordinate loss of HOXA5 and p53 expression occurs in breast tumors with HOXA5 promoter methylation.","method":"Transient transfection reporter assay, promoter analysis, cell death assay, bisulfite methylation analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — promoter reporter assay plus functional p53-dependent apoptosis, replicated in primary tumors","pmids":["10879542"],"is_preprint":false},{"year":2000,"finding":"HOXA5 transcriptionally activates the progesterone receptor (PR) promoter via a single HOXA5-binding site; HOXA5 binds directly to this site in the PR promoter, and this activity is specific to HOXA5 (not HOXB4, -B5, or -B7); induced HOXA5 expression elevates endogenous PR mRNA in MCF-7 cells.","method":"Promoter deletion and mutation analysis, transient transfection assays, gel-shift/DNA binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct DNA binding confirmed by gel-shift plus promoter mutagenesis and functional transactivation","pmids":["10875927"],"is_preprint":false},{"year":2002,"finding":"Hoxa5 acts in the stomach mesenchyme and controls mesenchymal-epithelial signaling; loss of Hoxa5 function perturbs expression of sonic hedgehog, Indian hedgehog, TGF-β family members, and FGF10, leading to defective gastric epithelial cell specification.","method":"Hoxa5-/- mouse analysis, histology, in situ hybridization, molecular marker expression","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined signaling molecule expression changes and tissue-specific epistasis","pmids":["12163410"],"is_preprint":false},{"year":2002,"finding":"Hoxa5 interacts genetically with Pax1 in vertebral patterning and acromion morphogenesis; Hoxa5 ensures Pax1 expression at the correct time/position, and has a distinctive role in specifying perichondrial and chondrogenic cell lineages in a Sox9-dependent manner.","method":"Compound mutant mouse analysis, expression studies, genetic epistasis","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in compound mutants with downstream Sox9 expression analysis","pmids":["11900462"],"is_preprint":false},{"year":2002,"finding":"Hoxa5 overexpression in transgenic mice (via Hoxb2 regulatory elements) causes postnatal dwarfism associated with 12-fold increase in liver IGFBP1 mRNA and 50% decrease in IGF1; Hoxa5 directly interacts with Forkhead box transcription factors FKHR and FoxA2/HNF3β (pull-down in vitro and after co-expression), and context-dependently modulates IGFBP1 promoter activity.","method":"Transgenic mouse overexpression, pull-down interaction assays, transfection reporter assays","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 — direct protein-protein interaction by pull-down plus in vivo and in vitro promoter assays","pmids":["12163409"],"is_preprint":false},{"year":2003,"finding":"Loss of Hoxa5 function non-cell-autonomously perturbs thyroid gland development; follicle formation and thyroglobulin processing are abnormal, and expression of Nkx2.1, Pax8, Titf2, thyroglobulin, and thyroperoxidase is affected in Hoxa5-/- thyroid.","method":"Hoxa5-/- mouse phenotypic analysis, immunohistochemistry, molecular marker expression","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined organ phenotype and downstream molecular marker changes","pmids":["12815622"],"is_preprint":false},{"year":2004,"finding":"HOXA5-induced apoptosis in p53-mutant breast cancer cells (Hs578T) is mediated specifically by caspases 2 and 8; caspase 2- and 8-specific inhibitors and siRNAs blocked HOXA5-induced cell death, whereas caspase 1, 3, 6, 9 inhibitors had no effect; HOXA5 sensitizes cells to TNFα-induced apoptosis by at least 100-fold.","method":"Inducible HOXA5 expression, caspase inhibitor panel, siRNA knockdown of caspases, western blot","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (inhibitors + siRNA + western blot) in a single study","pmids":["14701762"],"is_preprint":false},{"year":2004,"finding":"HOXA5 physically interacts with the anti-apoptotic protein Twist; HOXA5 can partially restore Twist-mediated inhibition of p53 target genes, both through transcriptional upregulation of p53 and through direct protein-protein interaction with Twist, thereby modulating p53 homeostasis in breast cancer cells.","method":"Co-immunoprecipitation, p53-promoter reporter assay, gamma-irradiation functional assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional reporter assay","pmids":["15545268"],"is_preprint":false},{"year":2005,"finding":"Cdx proteins bind directly to two conserved sites in a 164-bp element within the Hoxa5 mesodermal enhancer (MES) and repress Hoxa5 expression caudally; mutating the Cdx-binding sites causes caudal expansion of the transgene expression domain; Cdx4 is the primary posterior repressor of Hoxa5.","method":"In vitro DNA binding assays, transgenic mouse reporter analysis, binding site mutagenesis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — direct DNA binding with mutagenesis confirmed in vivo by transgenics","pmids":["15684390"],"is_preprint":false},{"year":2005,"finding":"Microarray analysis identified 306 genes modulated ≥2-fold by HOXA5 induction; pleiotrophin was confirmed as a direct transcriptional target: HOXA5 binds directly to one site on the pleiotrophin promoter by gel-shift and chromatin immunoprecipitation assays, and activates the promoter in transient transfection assays.","method":"Oligonucleotide microarray, promoter cloning, transient transfection, ChIP, gel-shift assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct DNA binding confirmed by both ChIP (in vivo) and EMSA, plus functional transactivation","pmids":["15757903"],"is_preprint":false},{"year":2006,"finding":"HOXA5 transcriptionally activates hMLH1 (MutL homolog 1) in breast cancer cells; HOXA5 binds to the hMLH1 promoter in vivo (ChIP), transactivates the hMLH1 promoter-reporter construct, and HOXA5 expression increases mismatch repair activity in MCF-7 cells.","method":"Yeast overexpression screen, promoter-reporter transient transfection, ChIP, in vivo repair assay","journal":"Neoplasia","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP (in vivo binding) plus reporter assay plus functional repair activity measurement","pmids":["16756717"],"is_preprint":false},{"year":2006,"finding":"CALM-AF10 leukemic transformation requires hDOT1L; hDOT1L upregulates Hoxa5 through H3K79 methylation at the Hoxa5 gene, and prevents nuclear export of CALM-AF10; knockdown of Hoxa5 impairs CALM-AF10-mediated transformation, establishing Hoxa5 as a critical downstream effector.","method":"Retroviral transformation assay, ChIP for H3K79me, shRNA knockdown, nuclear export assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 — ChIP-demonstrated H3K79 methylation at Hoxa5 locus plus functional epistasis by Hoxa5 knockdown","pmids":["16921363"],"is_preprint":false},{"year":2006,"finding":"Hoxa5 function is restricted to the mammary stroma; loss of Hoxa5 accelerates lobuloalveolar epithelium development; reciprocal mammary gland transplantation established that Hoxa5-/- stroma cannot support normal wild-type epithelial proliferation, demonstrating mesenchymal-epithelial crosstalk.","method":"Hoxa5-/- mouse analysis, reciprocal mammary epithelium grafting experiments","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 — reciprocal grafting experiments directly demonstrate stromal vs. epithelial contribution","pmids":["16607641"],"is_preprint":false},{"year":2006,"finding":"Loss of Hoxa5 function in lung mesenchyme leads to postnatal emphysema-like alveogenesis failure; defective alveolar myofibroblast precursor motility in embryonic lung causes mispositioning and abnormal elastin deposition postnatally; altered goblet cell specification pre-birth leads to goblet cell hyperplasia and mucus hypersecretion.","method":"Hoxa5-/- mouse histological, biochemical, and cell biological analysis","journal":"The American journal of pathology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular and molecular phenotypes across multiple readouts","pmids":["17003488"],"is_preprint":false},{"year":2007,"finding":"HOXA5 acts downstream of RARβ: a retinoic acid response element (RARE) in the 3' region of HOXA5 binds RARβ directly (ChIP assay); RARβ overexpression enhances RA-mediated HOXA5 induction; RARβ knockdown abolishes RA-induced HOXA5 expression; HOXA5 knockdown partially abrogates retinoid-induced apoptosis.","method":"ChIP, RARβ overexpression and siRNA knockdown, reporter assays, apoptosis assays","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP (in vivo binding) plus gain/loss-of-function with functional readout","pmids":["17804711"],"is_preprint":false},{"year":2007,"finding":"HoxA5 stabilizes adherens junctions in hemangioma endothelial cells by increasing Akt1 mRNA and protein expression and down-regulating PTEN; constitutively active Akt1 phenocopies HoxA5-mediated retention of β-catenin in adherens junctions and reduced permeability.","method":"HoxA5 stable expression in EOMA cells, in vivo tumor growth, 3D culture, β-catenin localization, Akt activity assays","journal":"Cell adhesion & migration","confidence":"Medium","confidence_rationale":"Tier 3 — single-lab study with functional phenotype but pathway placement based on correlative protein expression without direct binding","pmids":["19262140"],"is_preprint":false},{"year":2007,"finding":"miR-130a directly targets the 3'-UTR of HOXA5 and downregulates its expression and antiangiogenic activity in vascular endothelial cells; a miR-130a binding site in the HOXA5 3'-UTR was identified by genome-wide analysis and confirmed functionally.","method":"Luciferase reporter assay with HOXA5 3'-UTR, miR-130a forced expression, angiogenesis assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — direct 3'-UTR reporter assay confirming miRNA-target relationship with functional angiogenesis readout","pmids":["17957028"],"is_preprint":false},{"year":2012,"finding":"Loss of Hoxa5 function in lung mesenchyme promotes goblet cell metaplasia via Notch signaling; goblet cells arise from transdifferentiation of Clara cells; Notch1 and HEY2 are upregulated in Hoxa5-/- airways; in vivo γ-secretase inhibitor treatment attenuates goblet cell metaplasia.","method":"Hoxa5-/- mouse, naphthalene injury model, Notch pathway analysis, pharmacological inhibition in vivo","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 2 — genetic KO plus pharmacological rescue with defined cellular pathway","pmids":["23213461"],"is_preprint":false},{"year":2013,"finding":"RA-induced HOXA5 expression is co-regulated post-transcriptionally: miR-130a (a c-Myc target) represses HOXA5 translation under basal conditions; RA treatment degrades c-Myc (proteasome-dependent), reducing miR-130a and de-repressing HOXA5; HuR binds the 3'-UTR of HOXA5 mRNA and stabilizes it upon RA treatment.","method":"RNA-binding protein pulldown, miRNA inhibition/overexpression, mRNA stability assays, western blot","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing both miRNA and RBP regulatory mechanisms","pmids":["23528537"],"is_preprint":false},{"year":2013,"finding":"Hoxa5 and Hoxb5 are partially functionally redundant in lung morphogenesis; compound Hoxa5;Hoxb5 four-allele mutants display aggravated lung phenotype with lethality at birth; Hoxa5-exclusive expression in trachea and phrenic motor column underlies Hoxa5-specific trachea and diaphragm phenotypes.","method":"Compound Hoxa5;Hoxb5 mutant mice, histology, molecular analysis","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"High","confidence_rationale":"Tier 2 — genetic complementation/epistasis in compound mutants","pmids":["23585229"],"is_preprint":false},{"year":2015,"finding":"HOXA5 represses intestinal stem cell fate by inhibiting Wnt signaling; Wnt pathway suppresses HOXA5 to maintain stemness; re-expression of HOXA5 in colon cancer eliminates cancer stem cell phenotype; retinoids induce HOXA5 expression and trigger tumor regression by enforcing differentiation.","method":"In vivo mouse intestine Hoxa5 loss- and gain-of-function, Wnt reporter assays, cancer stem cell functional assays, retinoid treatment","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic experiments plus Wnt pathway reporter assays plus functional tumor assays","pmids":["26678341"],"is_preprint":false},{"year":2015,"finding":"HOXA5 inhibits lung cancer cell migration, invasion, and filopodia formation in vitro and metastasis in vivo; genome-wide transcriptomics indicated HOXA5 binds promoters of cytoskeleton-related genes and downregulates their mRNA and protein.","method":"Ectopic HOXA5 expression, invasion/migration assays, in vivo metastasis model, transcriptomic and pathway analysis, promoter binding analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 — functional phenotype established but cytoskeletal promoter binding only inferred computationally","pmids":["25875824"],"is_preprint":false},{"year":2015,"finding":"JARID1B (H3K4 demethylase) represses HOXA5 in endothelial cells by occupying the HOXA5 promoter and reducing H3K4 methylation; JARID1B knockdown or inhibition induces HOXA5 expression; this suppression of HOXA5 maintains endothelial angiogenic capacity.","method":"shRNA knockdown, ChIP (H3K4me at HOXA5 promoter), pharmacological JARID1B inhibition, retinal angiogenesis in endothelial-specific Jarid1b knockout mice","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP showing direct epigenetic mark at HOXA5 promoter, genetic KO with in vivo angiogenesis phenotype","pmids":["26023081"],"is_preprint":false},{"year":2017,"finding":"HOXA5 cooperates with STAT3 to transcriptionally activate PD-L1 in melanoma cells; HDAC8 inhibition increases activity of the PD-L1 promoter fragment enriched with HOXA5 and STAT3 binding sites; HOXA5 and STAT3 are physically associated (co-IP) and interdependent for PD-L1 transactivation; HOXA5 or STAT3 knockdown abolishes PD-L1 upregulation by HDAC8 inhibition.","method":"Co-immunoprecipitation, promoter-reporter assay, siRNA knockdown, T-cell functional assay","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — Co-IP confirming physical HOXA5-STAT3 interaction plus functional promoter and gene knockdown experiments","pmids":["29174371"],"is_preprint":false},{"year":2018,"finding":"HOXA5 promotes adipocyte differentiation partly by inhibiting the PKA/HSL signaling pathway; CEBPβ binds the Hoxa5 promoter and inhibits its methylation; HOXA5 transcriptionally activates Fabp4 (a positive regulator of adipocyte differentiation); these were shown by dual luciferase assay and chromatin binding.","method":"Luciferase assay, qPCR, western blot, lipid accumulation assay","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — single-lab study with reporter assays and phenotypic readouts; pathway placement partially mechanistic","pmids":["29439250"],"is_preprint":false},{"year":2019,"finding":"HOTAIR lncRNA recruits DNMT3b to the HOXA5 promoter, increasing its methylation and silencing HOXA5 expression in AML cells; silencing HOTAIR demethylates the HOXA5 promoter, restores HOXA5 expression, reduces proliferation, and induces apoptosis.","method":"ChIP/methylation assays, siRNA knockdown, gene expression analysis, xenograft model","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 3 — ChIP showing DNMT3b at HOXA5 promoter but single lab without structural or reconstitution evidence","pmids":["31168296"],"is_preprint":false},{"year":2019,"finding":"CDX2 is a transcription factor that binds the HOXA5 promoter; CAF-derived exosomal miR-181d-5p targets CDX2, which in turn reduces HOXA5 expression, promoting EMT in breast cancer cells; ChIP and dual luciferase reporter assays confirmed CDX2 binding to the HOXA5 promoter.","method":"ChIP, dual luciferase reporter assay, exosome co-culture, xenograft model","journal":"Molecular therapy. Nucleic acids","confidence":"Medium","confidence_rationale":"Tier 3 — ChIP and reporter assay confirm CDX2-HOXA5 promoter interaction, but single lab","pmids":["31955007"],"is_preprint":false},{"year":2019,"finding":"Hoxa5 alleviates obesity-induced adipose inflammation by inhibiting the eIF2α/PERK ER stress signaling pathway in adipocytes and by transcriptionally activating PPARγ to promote M2 macrophage polarization.","method":"Hoxa5 overexpression in adipocytes, transcriptome sequencing, pathway analysis, macrophage polarization assays","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 3 — mechanism based on transcriptome data and pathway analysis; direct binding not demonstrated","pmids":["31441588"],"is_preprint":false},{"year":2020,"finding":"Sp1 transcriptionally activates miR-130b-3p which then directly targets HOXA5 to suppress its expression in hepatocellular carcinoma; ChIP and luciferase assays confirmed Sp1 binding to the miR-130b-3p promoter and miR-130b-3p binding to the HOXA5 3'-UTR; HOXA5 knockdown promotes HCC angiogenesis in vitro and in vivo.","method":"Luciferase reporter assay, ChIP, tube formation assay, xenograft","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 3 — ChIP and reporter assays per Sp1/miR/HOXA5 axis, single lab","pmids":["32373208"],"is_preprint":false},{"year":2021,"finding":"HINT1 suppresses HOXA5 expression by inhibiting PKCβ1 membrane translocation and phosphorylation via direct interaction, thereby attenuating the MEK/ERK/YY1 signaling pathway that drives HOXA5 transcription; HOXA5 mediates cardiac hypertrophy through TGF-β signaling; AAV9-shHoxa5 abolished the cardioprotective effect of HINT1.","method":"Co-immunoprecipitation (HINT1-PKCβ1), cellular fractionation, AAV9-mediated cardiac-specific overexpression, shRNA knockdown in vivo, RNA-seq, transverse aortic constriction model","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 — Co-IP demonstrating direct HINT1-PKCβ1 interaction, in vivo gain- and loss-of-function with defined pathway and phenotypic rescue","pmids":["34098726"],"is_preprint":false},{"year":2021,"finding":"HOXA5 transactivates p53 by directly binding to the ATTA-rich core motif in the p53 promoter (ChIP PCR assay) in hypertrophic scar-derived fibroblasts; HOXA5 overexpression reduces proliferation and collagen synthesis, increases apoptosis, and elevates p21 and Mdm2; p53 silencing partially attenuates HOXA5-mediated effects.","method":"Luciferase reporter assay, ChIP PCR, siRNA knockdown, cell proliferation/apoptosis assays","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — ChIP (in vivo binding) confirms direct p53 promoter binding, supported by functional p53-dependent epistasis","pmids":["33414417"],"is_preprint":false},{"year":2022,"finding":"In renal cell carcinoma, HOXA5 suppresses EMT by binding to the SNAI2 (Slug) gene promoter together with DNMT3A, increasing Slug promoter methylation and silencing its expression; this was confirmed by ChIP, immunoblotting, and methylated DNA immunoprecipitation.","method":"ChIP, methylated DNA immunoprecipitation, luciferase reporter assay, GSEA, transwell/CCK-8 assays","journal":"Molecular cancer","confidence":"High","confidence_rationale":"Tier 2 — ChIP and meDIP provide direct evidence for HOXA5/DNMT3A-mediated Slug promoter methylation","pmids":["36536414"],"is_preprint":false},{"year":2024,"finding":"HOXA5 represses Jag1 transcription by directly binding to the JAG1 gene promoter; loss of HOXA5 (via DNA hypermethylation) derepresses JAG1, activating JAG1-NOTCH signaling and promoting kidney fibrosis; conditional Hoxa5 knockout aggravated fibrosis, conditional knockin alleviated it.","method":"ChIP (HOXA5 at JAG1 promoter), conditional KO and KI in kidney proximal tubules, genome-wide methylation analysis, 5-Aza rescue","journal":"Kidney international","confidence":"High","confidence_rationale":"Tier 1–2 — ChIP demonstrating direct HOXA5 binding to JAG1 promoter, conditional KO/KI with defined signaling pathway","pmids":["38521405"],"is_preprint":false}],"current_model":"HOXA5 is a homeodomain transcription factor that binds ATTA-containing DNA motifs (via its homeodomain) and the YPWM motif to interact with co-factor Pbx1; it directly transactivates p53, progesterone receptor, pleiotrophin, hMLH1, Fabp4, and PPARγ promoters while repressing JAG1 and Slug promoters (the latter with DNMT3A-mediated epigenetic silencing); upstream, its expression is induced by RARβ-bound retinoic acid response elements in its 3' region and stabilized by HuR, while being repressed post-transcriptionally by miR-130a, miR-196a, miR-181d-5p, and epigenetically by JARID1B (H3K4 demethylation) and HOTAIR/DNMT3b (DNA methylation); it regulates development through mesenchymal-epithelial signaling in multiple organs (lung, stomach, thyroid, mammary gland), controls hematopoietic lineage choice (myeloid vs. erythroid), induces apoptosis via caspases 2 and 8, modulates Wnt and Notch signaling, and interacts with protein partners including Twist and STAT3; its expression is regulated in the context of the CALM-AF10 fusion by hDOT1L-mediated H3K79 methylation, and in cardiac cells its expression is suppressed by HINT1 acting through PKCβ1/MEK/ERK/YY1 signaling."},"narrative":{"teleology":[{"year":1989,"claim":"Establishing that HOXA5 is a sequence-specific DNA-binding transcription factor resolved the basic molecular activity of this homeodomain protein, showing the core ATTA motif is essential for binding.","evidence":"DNase I footprinting and EMSA with mutagenesis of synthetic oligonucleotides in vitro","pmids":["2565857"],"confidence":"High","gaps":["No endogenous target genes identified at this stage","No information on cofactor requirements for DNA binding"]},{"year":1993,"claim":"Mouse knockouts revealed that Hoxa5 is required for pharyngeal arch-derived organ development (thymus, parathyroid, thyroid) and specifies cervicothoracic (C3–T2) axial identity, establishing its in vivo developmental necessity and regional specificity.","evidence":"Hoxa5-null mice generated by gene targeting; skeletal and organ phenotyping","pmids":["1673020","7901120"],"confidence":"High","gaps":["Cell-autonomous versus non-cell-autonomous mechanisms unresolved","Downstream target genes unknown"]},{"year":1993,"claim":"Cross-species functional equivalence with Drosophila Sex combs reduced demonstrated conservation of the Hox regulatory hierarchy and HOXA5's ability to activate downstream target genes such as fork head.","evidence":"Ectopic expression of mouse Hoxa5 in transgenic Drosophila with phenotypic and target gene analysis","pmids":["8095481"],"confidence":"High","gaps":["Mammalian target genes not yet identified","Mechanism of target specificity unclear"]},{"year":1996,"claim":"Domain dissection showed that the homeodomain mediates nuclear targeting and function, while the YPWM motif confers biological specificity through physical interaction with co-factor Pbx1, establishing the structural basis of HOXA5 activity.","evidence":"Truncation mutagenesis with transactivation assays and in vitro Pbx1 interaction in cultured cells and transgenic Drosophila","pmids":["8635464"],"confidence":"High","gaps":["No crystal structure of the HOXA5-Pbx1 complex","Other cofactors not explored"]},{"year":2000,"claim":"Identification of p53 and progesterone receptor as direct transcriptional targets connected HOXA5 to tumor suppression and hormone signaling, revealing it as a transactivator of clinically relevant promoters in breast cancer.","evidence":"Promoter-reporter assays, direct DNA binding by gel-shift, p53-dependent apoptosis assays, bisulfite methylation in primary tumors","pmids":["10879542","10875927"],"confidence":"High","gaps":["Whether HOXA5 binds p53 promoter in vivo (ChIP) not yet shown at this time","Mechanism of promoter methylation-mediated HOXA5 silencing not elucidated"]},{"year":2002,"claim":"Organ-specific knockout studies in stomach, thyroid, and skeleton demonstrated that Hoxa5 functions non-cell-autonomously through mesenchymal-epithelial signaling, controlling Shh/Ihh/FGF10/TGF-β expression in mesenchyme to specify epithelial fates.","evidence":"Hoxa5-null mouse phenotyping with molecular marker in situ hybridization in stomach, thyroid, and skeleton; compound Hoxa5;Pax1 mutant epistasis","pmids":["12163410","12815622","11900462"],"confidence":"High","gaps":["Direct transcriptional targets in mesenchyme not identified","Whether Hoxa5 binds Shh or FGF10 regulatory regions unknown"]},{"year":2004,"claim":"HOXA5-induced apoptosis was shown to operate through caspases 2 and 8 and to involve physical interaction with the anti-apoptotic protein Twist, providing a mechanistic basis for its p53-dependent and p53-independent pro-apoptotic functions.","evidence":"Caspase inhibitor panel and siRNA in inducible HOXA5-expressing breast cancer cells; reciprocal co-immunoprecipitation of HOXA5 and Twist","pmids":["14701762","15545268"],"confidence":"High","gaps":["How HOXA5 activates caspase 2/8 transcriptionally or indirectly is unclear","Structural basis of HOXA5-Twist interaction unknown"]},{"year":2005,"claim":"ChIP-confirmed direct binding of HOXA5 to the pleiotrophin promoter, and identification of Cdx4-mediated posterior boundary repression of the Hoxa5 locus, revealed both a direct target gene and the upstream transcriptional logic that restricts Hoxa5 expression along the body axis.","evidence":"ChIP and EMSA for pleiotrophin promoter binding; Cdx-binding site mutagenesis in transgenic mouse reporters","pmids":["15757903","15684390"],"confidence":"High","gaps":["Genome-wide map of direct HOXA5 targets not yet available","Whether Cdx proteins physically interact with HOXA5 protein unknown"]},{"year":2006,"claim":"In vivo studies established that Hoxa5 functions in lung and mammary mesenchyme to control alveolar myofibroblast positioning and lobulo-alveolar development, while hMLH1 was confirmed as a direct target linking HOXA5 to mismatch repair.","evidence":"Hoxa5-null lung histopathology; reciprocal mammary gland transplantation; ChIP at hMLH1 promoter with functional repair assay","pmids":["17003488","16607641","16756717"],"confidence":"High","gaps":["Stromal signals downstream of Hoxa5 in mammary gland unidentified","Genome-wide mismatch repair consequences not assessed"]},{"year":2007,"claim":"A RAR-β→HOXA5 regulatory axis was established: RAR-β directly binds a RARE in the HOXA5 3' region, and miR-130a was identified as a direct post-transcriptional repressor of HOXA5, together defining the retinoic acid-responsive circuit controlling HOXA5 expression.","evidence":"ChIP for RAR-β at HOXA5 RARE; luciferase reporter for miR-130a binding to HOXA5 3'-UTR; siRNA knockdown of RAR-β","pmids":["17804711","17957028"],"confidence":"High","gaps":["Other RARs that may regulate HOXA5 not tested","Quantitative contribution of miR-130a vs. promoter methylation to HOXA5 silencing unknown"]},{"year":2013,"claim":"Post-transcriptional regulation of HOXA5 was further elaborated: HuR stabilizes HOXA5 mRNA upon RA treatment, while c-Myc-driven miR-130a basally represses HOXA5 translation, establishing a dual-layer (miRNA + RBP) control module.","evidence":"RNA-binding protein pulldown, miRNA inhibition/overexpression, mRNA stability assays in breast cancer cells","pmids":["23528537"],"confidence":"High","gaps":["Whether HuR binds HOXA5 mRNA in non-cancer contexts not tested","Additional miRNAs targeting HOXA5 not systematically profiled at this time"]},{"year":2015,"claim":"HOXA5 was placed as an antagonist of Wnt signaling and intestinal stem cell fate, and its promoter was shown to be repressed by JARID1B through H3K4 demethylation, establishing both a pathway-level tumor-suppressive mechanism and an epigenetic silencing axis.","evidence":"In vivo gain/loss-of-function in mouse intestine with Wnt reporters and cancer stem cell assays; ChIP for H3K4me at HOXA5 promoter in endothelial-specific Jarid1b knockout mice","pmids":["26678341","26023081"],"confidence":"High","gaps":["Direct Wnt target genes repressed by HOXA5 not identified","Whether JARID1B regulation of HOXA5 operates in non-endothelial tissues unclear"]},{"year":2017,"claim":"Physical association of HOXA5 with STAT3, shown by co-immunoprecipitation, revealed cooperative transactivation of PD-L1, linking HOXA5 to immune checkpoint regulation in melanoma.","evidence":"Co-IP of HOXA5 and STAT3, PD-L1 promoter-reporter assay, siRNA knockdown, T-cell killing assay","pmids":["29174371"],"confidence":"High","gaps":["Whether HOXA5-STAT3 interaction is direct or bridged by DNA unknown","Generalizability beyond melanoma not tested"]},{"year":2019,"claim":"HOTAIR/DNMT3b-mediated DNA methylation was shown to silence the HOXA5 promoter in AML, and HOXA5's transcriptional activation of PPARγ was linked to anti-inflammatory macrophage polarization, broadening its epigenetic regulation and immune-metabolic roles.","evidence":"ChIP and methylation assays for DNMT3b at HOXA5 promoter; Hoxa5 overexpression in adipocytes with transcriptome sequencing and macrophage polarization assays","pmids":["31168296","31441588"],"confidence":"Medium","gaps":["Direct HOXA5 binding to PPARγ promoter not demonstrated","HOTAIR-DNMT3b mechanism based on single lab without reconstitution"]},{"year":2021,"claim":"HINT1 was shown to suppress HOXA5 transcription via PKCβ1/MEK/ERK/YY1 signaling in cardiomyocytes, and ChIP confirmed direct HOXA5 binding to the p53 promoter ATTA motif in fibroblasts, extending HOXA5 function to cardiac hypertrophy and fibrotic disease.","evidence":"Co-IP of HINT1-PKCβ1, AAV9-mediated cardiac-specific overexpression/knockdown with transverse aortic constriction; ChIP PCR at p53 promoter in hypertrophic scar fibroblasts","pmids":["34098726","33414417"],"confidence":"High","gaps":["Whether YY1 directly binds the HOXA5 promoter not demonstrated","Cardiac-specific HOXA5 targets beyond TGF-β pathway unknown"]},{"year":2022,"claim":"HOXA5 was shown to recruit DNMT3A to the Slug promoter, increasing its methylation and silencing EMT, establishing a direct epigenetic effector mechanism for HOXA5 in tumor suppression.","evidence":"ChIP and methylated DNA immunoprecipitation at Slug promoter in renal cell carcinoma cells","pmids":["36536414"],"confidence":"High","gaps":["Whether HOXA5-DNMT3A interaction is direct or mediated through intermediates not shown","Genome-wide scope of HOXA5-directed DNA methylation unknown"]},{"year":2024,"claim":"Conditional knockout and knockin of Hoxa5 in kidney proximal tubules demonstrated that HOXA5 directly represses JAG1 transcription, restraining Notch signaling to prevent kidney fibrosis, providing the first tissue-specific conditional genetic evidence for HOXA5 in renal pathology.","evidence":"ChIP at JAG1 promoter, conditional Hoxa5 KO/KI in kidney, genome-wide methylation analysis, 5-Aza rescue","pmids":["38521405"],"confidence":"High","gaps":["Whether HOXA5 represses other Notch ligands in kidney not tested","Upstream signals leading to HOXA5 promoter hypermethylation in fibrotic kidney undefined"]},{"year":null,"claim":"A genome-wide map of direct HOXA5 binding sites (by ChIP-seq in primary tissues), the structural basis of its interactions with Pbx1, Twist, STAT3, and DNMT3A, and the relative contributions of transcriptional versus epigenetic effector mechanisms across tissue contexts remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No published ChIP-seq in primary developmental tissues","No crystal or cryo-EM structure of HOXA5 with any partner","Quantitative contribution of HOXA5 to Wnt vs. Notch vs. p53 pathways in different tissue contexts unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[0,9,17,38,40]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[8,9,17,18,28,31,39,40]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,4]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,2,3,6,10,11,13,21,27]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,9,17,18,31,38,39,40]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[8,14,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[25,28,37,40]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[19,30,33]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[31]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[19,28,33]}],"complexes":[],"partners":["PBX1","TWIST1","STAT3","DNMT3A","ELAVL1","FKHR","FOXA2"],"other_free_text":[]},"mechanistic_narrative":"HOXA5 is a homeodomain transcription factor that specifies regional identity along the anteroposterior axis and orchestrates mesenchymal-epithelial signaling in multiple organs during development and tissue homeostasis. It binds ATTA-containing DNA motifs through its homeodomain and engages the co-factor Pbx1 via its YPWM motif; it directly transactivates the promoters of p53, progesterone receptor, pleiotrophin, hMLH1, Fabp4, and PPARγ while repressing JAG1 (thereby restraining Notch signaling) and Slug (via DNMT3A-mediated promoter methylation), linking it to apoptosis through caspases 2 and 8, Wnt pathway inhibition, and suppression of epithelial-mesenchymal transition [PMID:2565857, PMID:8635464, PMID:10879542, PMID:10875927, PMID:15757903, PMID:36536414, PMID:38521405, PMID:14701762, PMID:26678341]. Its expression is induced by RAR-β-bound retinoic acid response elements, stabilized post-transcriptionally by HuR, and repressed by miR-130a, JARID1B-mediated H3K4 demethylation, and HOTAIR/DNMT3b-directed promoter methylation [PMID:17804711, PMID:23528537, PMID:17957028, PMID:26023081, PMID:31168296]. In vivo, Hoxa5 loss causes cervicothoracic homeotic transformations, perinatal lethality with athymia and cardiac defects, lung alveogenesis failure with goblet cell metaplasia, defective gastric epithelial specification, and accelerated mammary lobuloalveolar development — phenotypes arising from its mesenchymal function — while gain-of-function diverts hematopoietic progenitors from erythroid to myeloid fate and eliminates intestinal cancer stem cells [PMID:1673020, PMID:7901120, PMID:17003488, PMID:12163410, PMID:16607641, PMID:10397719, PMID:26678341]."},"prefetch_data":{"uniprot":{"accession":"P20719","full_name":"Homeobox protein Hox-A5","aliases":["Homeobox protein Hox-1C"],"length_aa":270,"mass_kda":29.3,"function":"Sequence-specific transcription factor which is part of a developmental regulatory system that provides cells with specific positional identities on the anterior-posterior axis. Also binds to its own promoter. Binds specifically to the motif 5'-CYYNATTA[TG]Y-3'","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P20719/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HOXA5","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HOXA5","total_profiled":1310},"omim":[{"mim_id":"621248","title":"PULMONARY HYPERTENSION, PRIMARY, 7; PPH7","url":"https://www.omim.org/entry/621248"},{"mim_id":"615480","title":"BLADDER CANCER-ASSOCIATED TRANSCRIPT 1, NONCODING; BLACAT1","url":"https://www.omim.org/entry/615480"},{"mim_id":"610928","title":"SRY-BOX 17; SOX17","url":"https://www.omim.org/entry/610928"},{"mim_id":"610175","title":"MICRO RNA 130A; MIR130A","url":"https://www.omim.org/entry/610175"},{"mim_id":"601622","title":"TWIST FAMILY bHLH TRANSCRIPTION FACTOR 1; TWIST1","url":"https://www.omim.org/entry/601622"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adrenal gland","ntpm":77.6},{"tissue":"epididymis","ntpm":46.2},{"tissue":"fallopian tube","ntpm":55.4}],"url":"https://www.proteinatlas.org/search/HOXA5"},"hgnc":{"alias_symbol":[],"prev_symbol":["HOX1C","HOX1"]},"alphafold":{"accession":"P20719","domains":[{"cath_id":"1.10.10.60","chopping":"204-259","consensus_level":"medium","plddt":95.465,"start":204,"end":259}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P20719","model_url":"https://alphafold.ebi.ac.uk/files/AF-P20719-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P20719-F1-predicted_aligned_error_v6.png","plddt_mean":61.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HOXA5","jax_strain_url":"https://www.jax.org/strain/search?query=HOXA5"},"sequence":{"accession":"P20719","fasta_url":"https://rest.uniprot.org/uniprotkb/P20719.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P20719/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P20719"}},"corpus_meta":[{"pmid":"1673020","id":"PMC_1673020","title":"Regionally restricted developmental 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Inhibiting Wnt Signaling in Colorectal Cancer.","date":"2015","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/26678341","citation_count":180,"is_preprint":false},{"pmid":"22876840","id":"PMC_22876840","title":"MicroRNA-196a promotes non-small cell lung cancer cell proliferation and invasion through targeting HOXA5.","date":"2012","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/22876840","citation_count":168,"is_preprint":false},{"pmid":"7901120","id":"PMC_7901120","title":"Specification of axial identity in the mouse: role of the Hoxa-5 (Hox1.3) gene.","date":"1993","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/7901120","citation_count":167,"is_preprint":false},{"pmid":"16921363","id":"PMC_16921363","title":"Leukaemic transformation by CALM-AF10 involves upregulation of Hoxa5 by hDOT1L.","date":"2006","source":"Nature cell 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DNase I footprinting identified a binding site 144 bp upstream of the Hox-1.3 transcription start, and the consensus binding motif CPyPyNATTAT/GPy was deduced; base substitutions in the core ATTA sequence abolished binding.\",\n      \"method\": \"DNase I footprinting, electrophoretic mobility shift assay (EMSA), in vitro DNA binding with synthetic oligonucleotides, subcellular fractionation\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assay with mutagenesis validating sequence-specific DNA binding\",\n      \"pmids\": [\"2565857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Targeted disruption of Hoxa5 (Hox-1.5) in mice causes perinatal lethality with athymia, aparathyroidism, reduced thyroid and submaxillary tissue, heart/artery defects, and craniofacial abnormalities, establishing Hoxa5 as required for pharyngeal arch and neural crest-derived organ development.\",\n      \"method\": \"Gene targeting in embryonic stem cells, mouse knockout\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined multi-organ phenotypic readout, foundational paper, highly cited\",\n      \"pmids\": [\"1673020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Loss of Hoxa5 function in mice causes homeotic transformations restricted to cervical vertebra C3 through thoracic vertebra T2, demonstrating Hoxa5 specifies regional axial identity in the cervicothoracic skeleton; the most frequent anomaly is posterior transformation of C7 into a rib-bearing thoracic vertebra.\",\n      \"method\": \"Targeted mutagenesis in embryonic stem cells, skeletal analysis of Hoxa5-/- mice\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined skeletal phenotype and regional specificity\",\n      \"pmids\": [\"7901120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Mouse Hox-a5 is functionally equivalent to Drosophila Sex combs reduced (Scr): ectopic expression of Hox-a5 in Drosophila induces Scr-like homeotic transformations and activates the Scr target gene fork head, demonstrating direct participation in a regulatory hierarchy.\",\n      \"method\": \"Transgenic Drosophila overexpression, phenotypic analysis, target gene (fork head) expression assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional reconstitution in vivo with target gene activation, replicated across tissues\",\n      \"pmids\": [\"8095481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Functional dissection of Hox-a5 showed: (1) the homeodomain is essential for nuclear targeting and protein function; (2) the N-terminal region contributes to transcriptional activation and transformation potential but not functional specificity; (3) the YPWM motif is essential for biological specificity and mediates interaction with co-factor Pbx1 in vitro.\",\n      \"method\": \"Truncation mutagenesis, transactivation assays in cultured cells, transgenic Drosophila functional assays, in vitro Pbx1 interaction\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with mutagenesis, multiple orthogonal assays in one study\",\n      \"pmids\": [\"8635464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"HOXA5 and HOXB7 are expressed in cerebellar Purkinje cells and synergistically activate the Purkinje cell-specific pcp-2(L7) promoter via TAAT-containing sequence elements (L7ATE), as shown by co-transfection assays.\",\n      \"method\": \"RT-PCR cloning, co-transfection transcriptional activation assays\",\n      \"journal\": \"Journal of neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single-lab co-transfection assay without in vivo validation of direct binding\",\n      \"pmids\": [\"9740027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Hoxa5 homeotic transformations of the cervicothoracic skeleton are confined to C3–T2, corresponding to the major transcript domain; Cdx/Hoxa4 mutations alter Hoxa5 expression in cis in the cervicothoracic prevertebral column, and compound Hoxa4/Hoxa5 heterozygotes show Hoxa5-like transformations, demonstrating transcriptional interference and regional autoregulation.\",\n      \"method\": \"Genetic epistasis in compound mutant mice, in situ hybridization\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with compound mutants and expression analysis\",\n      \"pmids\": [\"9603431\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Constitutive expression of HOXA5 in human CD34+ hematopoietic progenitors inhibits erythropoiesis and promotes myelopoiesis, diverting differentiation at a multipotent progenitor stage; erythroid progenitor (BFU-E) frequency was significantly reduced with no change in total CFU numbers.\",\n      \"method\": \"Retroviral transduction of CD34+ and CD34+CD38- cells, immunophenotyping, morphological analysis, clonal analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean gain-of-function with defined differentiation phenotype, multiple readouts\",\n      \"pmids\": [\"10397719\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"HOXA5 transcriptionally activates the p53 promoter; transient transfection of HOXA5 activated the p53 promoter, and HOXA5 expression in wild-type p53 (but not p53-null) breast cancer cells induced apoptosis; coordinate loss of HOXA5 and p53 expression occurs in breast tumors with HOXA5 promoter methylation.\",\n      \"method\": \"Transient transfection reporter assay, promoter analysis, cell death assay, bisulfite methylation analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — promoter reporter assay plus functional p53-dependent apoptosis, replicated in primary tumors\",\n      \"pmids\": [\"10879542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"HOXA5 transcriptionally activates the progesterone receptor (PR) promoter via a single HOXA5-binding site; HOXA5 binds directly to this site in the PR promoter, and this activity is specific to HOXA5 (not HOXB4, -B5, or -B7); induced HOXA5 expression elevates endogenous PR mRNA in MCF-7 cells.\",\n      \"method\": \"Promoter deletion and mutation analysis, transient transfection assays, gel-shift/DNA binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct DNA binding confirmed by gel-shift plus promoter mutagenesis and functional transactivation\",\n      \"pmids\": [\"10875927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Hoxa5 acts in the stomach mesenchyme and controls mesenchymal-epithelial signaling; loss of Hoxa5 function perturbs expression of sonic hedgehog, Indian hedgehog, TGF-β family members, and FGF10, leading to defective gastric epithelial cell specification.\",\n      \"method\": \"Hoxa5-/- mouse analysis, histology, in situ hybridization, molecular marker expression\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined signaling molecule expression changes and tissue-specific epistasis\",\n      \"pmids\": [\"12163410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Hoxa5 interacts genetically with Pax1 in vertebral patterning and acromion morphogenesis; Hoxa5 ensures Pax1 expression at the correct time/position, and has a distinctive role in specifying perichondrial and chondrogenic cell lineages in a Sox9-dependent manner.\",\n      \"method\": \"Compound mutant mouse analysis, expression studies, genetic epistasis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in compound mutants with downstream Sox9 expression analysis\",\n      \"pmids\": [\"11900462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Hoxa5 overexpression in transgenic mice (via Hoxb2 regulatory elements) causes postnatal dwarfism associated with 12-fold increase in liver IGFBP1 mRNA and 50% decrease in IGF1; Hoxa5 directly interacts with Forkhead box transcription factors FKHR and FoxA2/HNF3β (pull-down in vitro and after co-expression), and context-dependently modulates IGFBP1 promoter activity.\",\n      \"method\": \"Transgenic mouse overexpression, pull-down interaction assays, transfection reporter assays\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein-protein interaction by pull-down plus in vivo and in vitro promoter assays\",\n      \"pmids\": [\"12163409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Loss of Hoxa5 function non-cell-autonomously perturbs thyroid gland development; follicle formation and thyroglobulin processing are abnormal, and expression of Nkx2.1, Pax8, Titf2, thyroglobulin, and thyroperoxidase is affected in Hoxa5-/- thyroid.\",\n      \"method\": \"Hoxa5-/- mouse phenotypic analysis, immunohistochemistry, molecular marker expression\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined organ phenotype and downstream molecular marker changes\",\n      \"pmids\": [\"12815622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HOXA5-induced apoptosis in p53-mutant breast cancer cells (Hs578T) is mediated specifically by caspases 2 and 8; caspase 2- and 8-specific inhibitors and siRNAs blocked HOXA5-induced cell death, whereas caspase 1, 3, 6, 9 inhibitors had no effect; HOXA5 sensitizes cells to TNFα-induced apoptosis by at least 100-fold.\",\n      \"method\": \"Inducible HOXA5 expression, caspase inhibitor panel, siRNA knockdown of caspases, western blot\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (inhibitors + siRNA + western blot) in a single study\",\n      \"pmids\": [\"14701762\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HOXA5 physically interacts with the anti-apoptotic protein Twist; HOXA5 can partially restore Twist-mediated inhibition of p53 target genes, both through transcriptional upregulation of p53 and through direct protein-protein interaction with Twist, thereby modulating p53 homeostasis in breast cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, p53-promoter reporter assay, gamma-irradiation functional assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional reporter assay\",\n      \"pmids\": [\"15545268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Cdx proteins bind directly to two conserved sites in a 164-bp element within the Hoxa5 mesodermal enhancer (MES) and repress Hoxa5 expression caudally; mutating the Cdx-binding sites causes caudal expansion of the transgene expression domain; Cdx4 is the primary posterior repressor of Hoxa5.\",\n      \"method\": \"In vitro DNA binding assays, transgenic mouse reporter analysis, binding site mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct DNA binding with mutagenesis confirmed in vivo by transgenics\",\n      \"pmids\": [\"15684390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Microarray analysis identified 306 genes modulated ≥2-fold by HOXA5 induction; pleiotrophin was confirmed as a direct transcriptional target: HOXA5 binds directly to one site on the pleiotrophin promoter by gel-shift and chromatin immunoprecipitation assays, and activates the promoter in transient transfection assays.\",\n      \"method\": \"Oligonucleotide microarray, promoter cloning, transient transfection, ChIP, gel-shift assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct DNA binding confirmed by both ChIP (in vivo) and EMSA, plus functional transactivation\",\n      \"pmids\": [\"15757903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"HOXA5 transcriptionally activates hMLH1 (MutL homolog 1) in breast cancer cells; HOXA5 binds to the hMLH1 promoter in vivo (ChIP), transactivates the hMLH1 promoter-reporter construct, and HOXA5 expression increases mismatch repair activity in MCF-7 cells.\",\n      \"method\": \"Yeast overexpression screen, promoter-reporter transient transfection, ChIP, in vivo repair assay\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP (in vivo binding) plus reporter assay plus functional repair activity measurement\",\n      \"pmids\": [\"16756717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CALM-AF10 leukemic transformation requires hDOT1L; hDOT1L upregulates Hoxa5 through H3K79 methylation at the Hoxa5 gene, and prevents nuclear export of CALM-AF10; knockdown of Hoxa5 impairs CALM-AF10-mediated transformation, establishing Hoxa5 as a critical downstream effector.\",\n      \"method\": \"Retroviral transformation assay, ChIP for H3K79me, shRNA knockdown, nuclear export assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-demonstrated H3K79 methylation at Hoxa5 locus plus functional epistasis by Hoxa5 knockdown\",\n      \"pmids\": [\"16921363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Hoxa5 function is restricted to the mammary stroma; loss of Hoxa5 accelerates lobuloalveolar epithelium development; reciprocal mammary gland transplantation established that Hoxa5-/- stroma cannot support normal wild-type epithelial proliferation, demonstrating mesenchymal-epithelial crosstalk.\",\n      \"method\": \"Hoxa5-/- mouse analysis, reciprocal mammary epithelium grafting experiments\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal grafting experiments directly demonstrate stromal vs. epithelial contribution\",\n      \"pmids\": [\"16607641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Loss of Hoxa5 function in lung mesenchyme leads to postnatal emphysema-like alveogenesis failure; defective alveolar myofibroblast precursor motility in embryonic lung causes mispositioning and abnormal elastin deposition postnatally; altered goblet cell specification pre-birth leads to goblet cell hyperplasia and mucus hypersecretion.\",\n      \"method\": \"Hoxa5-/- mouse histological, biochemical, and cell biological analysis\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and molecular phenotypes across multiple readouts\",\n      \"pmids\": [\"17003488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HOXA5 acts downstream of RARβ: a retinoic acid response element (RARE) in the 3' region of HOXA5 binds RARβ directly (ChIP assay); RARβ overexpression enhances RA-mediated HOXA5 induction; RARβ knockdown abolishes RA-induced HOXA5 expression; HOXA5 knockdown partially abrogates retinoid-induced apoptosis.\",\n      \"method\": \"ChIP, RARβ overexpression and siRNA knockdown, reporter assays, apoptosis assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP (in vivo binding) plus gain/loss-of-function with functional readout\",\n      \"pmids\": [\"17804711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HoxA5 stabilizes adherens junctions in hemangioma endothelial cells by increasing Akt1 mRNA and protein expression and down-regulating PTEN; constitutively active Akt1 phenocopies HoxA5-mediated retention of β-catenin in adherens junctions and reduced permeability.\",\n      \"method\": \"HoxA5 stable expression in EOMA cells, in vivo tumor growth, 3D culture, β-catenin localization, Akt activity assays\",\n      \"journal\": \"Cell adhesion & migration\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single-lab study with functional phenotype but pathway placement based on correlative protein expression without direct binding\",\n      \"pmids\": [\"19262140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"miR-130a directly targets the 3'-UTR of HOXA5 and downregulates its expression and antiangiogenic activity in vascular endothelial cells; a miR-130a binding site in the HOXA5 3'-UTR was identified by genome-wide analysis and confirmed functionally.\",\n      \"method\": \"Luciferase reporter assay with HOXA5 3'-UTR, miR-130a forced expression, angiogenesis assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct 3'-UTR reporter assay confirming miRNA-target relationship with functional angiogenesis readout\",\n      \"pmids\": [\"17957028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss of Hoxa5 function in lung mesenchyme promotes goblet cell metaplasia via Notch signaling; goblet cells arise from transdifferentiation of Clara cells; Notch1 and HEY2 are upregulated in Hoxa5-/- airways; in vivo γ-secretase inhibitor treatment attenuates goblet cell metaplasia.\",\n      \"method\": \"Hoxa5-/- mouse, naphthalene injury model, Notch pathway analysis, pharmacological inhibition in vivo\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO plus pharmacological rescue with defined cellular pathway\",\n      \"pmids\": [\"23213461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RA-induced HOXA5 expression is co-regulated post-transcriptionally: miR-130a (a c-Myc target) represses HOXA5 translation under basal conditions; RA treatment degrades c-Myc (proteasome-dependent), reducing miR-130a and de-repressing HOXA5; HuR binds the 3'-UTR of HOXA5 mRNA and stabilizes it upon RA treatment.\",\n      \"method\": \"RNA-binding protein pulldown, miRNA inhibition/overexpression, mRNA stability assays, western blot\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing both miRNA and RBP regulatory mechanisms\",\n      \"pmids\": [\"23528537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hoxa5 and Hoxb5 are partially functionally redundant in lung morphogenesis; compound Hoxa5;Hoxb5 four-allele mutants display aggravated lung phenotype with lethality at birth; Hoxa5-exclusive expression in trachea and phrenic motor column underlies Hoxa5-specific trachea and diaphragm phenotypes.\",\n      \"method\": \"Compound Hoxa5;Hoxb5 mutant mice, histology, molecular analysis\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic complementation/epistasis in compound mutants\",\n      \"pmids\": [\"23585229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HOXA5 represses intestinal stem cell fate by inhibiting Wnt signaling; Wnt pathway suppresses HOXA5 to maintain stemness; re-expression of HOXA5 in colon cancer eliminates cancer stem cell phenotype; retinoids induce HOXA5 expression and trigger tumor regression by enforcing differentiation.\",\n      \"method\": \"In vivo mouse intestine Hoxa5 loss- and gain-of-function, Wnt reporter assays, cancer stem cell functional assays, retinoid treatment\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic experiments plus Wnt pathway reporter assays plus functional tumor assays\",\n      \"pmids\": [\"26678341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HOXA5 inhibits lung cancer cell migration, invasion, and filopodia formation in vitro and metastasis in vivo; genome-wide transcriptomics indicated HOXA5 binds promoters of cytoskeleton-related genes and downregulates their mRNA and protein.\",\n      \"method\": \"Ectopic HOXA5 expression, invasion/migration assays, in vivo metastasis model, transcriptomic and pathway analysis, promoter binding analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional phenotype established but cytoskeletal promoter binding only inferred computationally\",\n      \"pmids\": [\"25875824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"JARID1B (H3K4 demethylase) represses HOXA5 in endothelial cells by occupying the HOXA5 promoter and reducing H3K4 methylation; JARID1B knockdown or inhibition induces HOXA5 expression; this suppression of HOXA5 maintains endothelial angiogenic capacity.\",\n      \"method\": \"shRNA knockdown, ChIP (H3K4me at HOXA5 promoter), pharmacological JARID1B inhibition, retinal angiogenesis in endothelial-specific Jarid1b knockout mice\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP showing direct epigenetic mark at HOXA5 promoter, genetic KO with in vivo angiogenesis phenotype\",\n      \"pmids\": [\"26023081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HOXA5 cooperates with STAT3 to transcriptionally activate PD-L1 in melanoma cells; HDAC8 inhibition increases activity of the PD-L1 promoter fragment enriched with HOXA5 and STAT3 binding sites; HOXA5 and STAT3 are physically associated (co-IP) and interdependent for PD-L1 transactivation; HOXA5 or STAT3 knockdown abolishes PD-L1 upregulation by HDAC8 inhibition.\",\n      \"method\": \"Co-immunoprecipitation, promoter-reporter assay, siRNA knockdown, T-cell functional assay\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP confirming physical HOXA5-STAT3 interaction plus functional promoter and gene knockdown experiments\",\n      \"pmids\": [\"29174371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HOXA5 promotes adipocyte differentiation partly by inhibiting the PKA/HSL signaling pathway; CEBPβ binds the Hoxa5 promoter and inhibits its methylation; HOXA5 transcriptionally activates Fabp4 (a positive regulator of adipocyte differentiation); these were shown by dual luciferase assay and chromatin binding.\",\n      \"method\": \"Luciferase assay, qPCR, western blot, lipid accumulation assay\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single-lab study with reporter assays and phenotypic readouts; pathway placement partially mechanistic\",\n      \"pmids\": [\"29439250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HOTAIR lncRNA recruits DNMT3b to the HOXA5 promoter, increasing its methylation and silencing HOXA5 expression in AML cells; silencing HOTAIR demethylates the HOXA5 promoter, restores HOXA5 expression, reduces proliferation, and induces apoptosis.\",\n      \"method\": \"ChIP/methylation assays, siRNA knockdown, gene expression analysis, xenograft model\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — ChIP showing DNMT3b at HOXA5 promoter but single lab without structural or reconstitution evidence\",\n      \"pmids\": [\"31168296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDX2 is a transcription factor that binds the HOXA5 promoter; CAF-derived exosomal miR-181d-5p targets CDX2, which in turn reduces HOXA5 expression, promoting EMT in breast cancer cells; ChIP and dual luciferase reporter assays confirmed CDX2 binding to the HOXA5 promoter.\",\n      \"method\": \"ChIP, dual luciferase reporter assay, exosome co-culture, xenograft model\",\n      \"journal\": \"Molecular therapy. Nucleic acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — ChIP and reporter assay confirm CDX2-HOXA5 promoter interaction, but single lab\",\n      \"pmids\": [\"31955007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Hoxa5 alleviates obesity-induced adipose inflammation by inhibiting the eIF2α/PERK ER stress signaling pathway in adipocytes and by transcriptionally activating PPARγ to promote M2 macrophage polarization.\",\n      \"method\": \"Hoxa5 overexpression in adipocytes, transcriptome sequencing, pathway analysis, macrophage polarization assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — mechanism based on transcriptome data and pathway analysis; direct binding not demonstrated\",\n      \"pmids\": [\"31441588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Sp1 transcriptionally activates miR-130b-3p which then directly targets HOXA5 to suppress its expression in hepatocellular carcinoma; ChIP and luciferase assays confirmed Sp1 binding to the miR-130b-3p promoter and miR-130b-3p binding to the HOXA5 3'-UTR; HOXA5 knockdown promotes HCC angiogenesis in vitro and in vivo.\",\n      \"method\": \"Luciferase reporter assay, ChIP, tube formation assay, xenograft\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — ChIP and reporter assays per Sp1/miR/HOXA5 axis, single lab\",\n      \"pmids\": [\"32373208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HINT1 suppresses HOXA5 expression by inhibiting PKCβ1 membrane translocation and phosphorylation via direct interaction, thereby attenuating the MEK/ERK/YY1 signaling pathway that drives HOXA5 transcription; HOXA5 mediates cardiac hypertrophy through TGF-β signaling; AAV9-shHoxa5 abolished the cardioprotective effect of HINT1.\",\n      \"method\": \"Co-immunoprecipitation (HINT1-PKCβ1), cellular fractionation, AAV9-mediated cardiac-specific overexpression, shRNA knockdown in vivo, RNA-seq, transverse aortic constriction model\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP demonstrating direct HINT1-PKCβ1 interaction, in vivo gain- and loss-of-function with defined pathway and phenotypic rescue\",\n      \"pmids\": [\"34098726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HOXA5 transactivates p53 by directly binding to the ATTA-rich core motif in the p53 promoter (ChIP PCR assay) in hypertrophic scar-derived fibroblasts; HOXA5 overexpression reduces proliferation and collagen synthesis, increases apoptosis, and elevates p21 and Mdm2; p53 silencing partially attenuates HOXA5-mediated effects.\",\n      \"method\": \"Luciferase reporter assay, ChIP PCR, siRNA knockdown, cell proliferation/apoptosis assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP (in vivo binding) confirms direct p53 promoter binding, supported by functional p53-dependent epistasis\",\n      \"pmids\": [\"33414417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In renal cell carcinoma, HOXA5 suppresses EMT by binding to the SNAI2 (Slug) gene promoter together with DNMT3A, increasing Slug promoter methylation and silencing its expression; this was confirmed by ChIP, immunoblotting, and methylated DNA immunoprecipitation.\",\n      \"method\": \"ChIP, methylated DNA immunoprecipitation, luciferase reporter assay, GSEA, transwell/CCK-8 assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and meDIP provide direct evidence for HOXA5/DNMT3A-mediated Slug promoter methylation\",\n      \"pmids\": [\"36536414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HOXA5 represses Jag1 transcription by directly binding to the JAG1 gene promoter; loss of HOXA5 (via DNA hypermethylation) derepresses JAG1, activating JAG1-NOTCH signaling and promoting kidney fibrosis; conditional Hoxa5 knockout aggravated fibrosis, conditional knockin alleviated it.\",\n      \"method\": \"ChIP (HOXA5 at JAG1 promoter), conditional KO and KI in kidney proximal tubules, genome-wide methylation analysis, 5-Aza rescue\",\n      \"journal\": \"Kidney international\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — ChIP demonstrating direct HOXA5 binding to JAG1 promoter, conditional KO/KI with defined signaling pathway\",\n      \"pmids\": [\"38521405\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HOXA5 is a homeodomain transcription factor that binds ATTA-containing DNA motifs (via its homeodomain) and the YPWM motif to interact with co-factor Pbx1; it directly transactivates p53, progesterone receptor, pleiotrophin, hMLH1, Fabp4, and PPARγ promoters while repressing JAG1 and Slug promoters (the latter with DNMT3A-mediated epigenetic silencing); upstream, its expression is induced by RARβ-bound retinoic acid response elements in its 3' region and stabilized by HuR, while being repressed post-transcriptionally by miR-130a, miR-196a, miR-181d-5p, and epigenetically by JARID1B (H3K4 demethylation) and HOTAIR/DNMT3b (DNA methylation); it regulates development through mesenchymal-epithelial signaling in multiple organs (lung, stomach, thyroid, mammary gland), controls hematopoietic lineage choice (myeloid vs. erythroid), induces apoptosis via caspases 2 and 8, modulates Wnt and Notch signaling, and interacts with protein partners including Twist and STAT3; its expression is regulated in the context of the CALM-AF10 fusion by hDOT1L-mediated H3K79 methylation, and in cardiac cells its expression is suppressed by HINT1 acting through PKCβ1/MEK/ERK/YY1 signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HOXA5 is a homeodomain transcription factor that specifies regional identity along the anteroposterior axis and orchestrates mesenchymal-epithelial signaling in multiple organs during development and tissue homeostasis. It binds ATTA-containing DNA motifs through its homeodomain and engages the co-factor Pbx1 via its YPWM motif; it directly transactivates the promoters of p53, progesterone receptor, pleiotrophin, hMLH1, Fabp4, and PPARγ while repressing JAG1 (thereby restraining Notch signaling) and Slug (via DNMT3A-mediated promoter methylation), linking it to apoptosis through caspases 2 and 8, Wnt pathway inhibition, and suppression of epithelial-mesenchymal transition [PMID:2565857, PMID:8635464, PMID:10879542, PMID:10875927, PMID:15757903, PMID:36536414, PMID:38521405, PMID:14701762, PMID:26678341]. Its expression is induced by RAR-β-bound retinoic acid response elements, stabilized post-transcriptionally by HuR, and repressed by miR-130a, JARID1B-mediated H3K4 demethylation, and HOTAIR/DNMT3b-directed promoter methylation [PMID:17804711, PMID:23528537, PMID:17957028, PMID:26023081, PMID:31168296]. In vivo, Hoxa5 loss causes cervicothoracic homeotic transformations, perinatal lethality with athymia and cardiac defects, lung alveogenesis failure with goblet cell metaplasia, defective gastric epithelial specification, and accelerated mammary lobuloalveolar development — phenotypes arising from its mesenchymal function — while gain-of-function diverts hematopoietic progenitors from erythroid to myeloid fate and eliminates intestinal cancer stem cells [PMID:1673020, PMID:7901120, PMID:17003488, PMID:12163410, PMID:16607641, PMID:10397719, PMID:26678341].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Establishing that HOXA5 is a sequence-specific DNA-binding transcription factor resolved the basic molecular activity of this homeodomain protein, showing the core ATTA motif is essential for binding.\",\n      \"evidence\": \"DNase I footprinting and EMSA with mutagenesis of synthetic oligonucleotides in vitro\",\n      \"pmids\": [\"2565857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No endogenous target genes identified at this stage\", \"No information on cofactor requirements for DNA binding\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Mouse knockouts revealed that Hoxa5 is required for pharyngeal arch-derived organ development (thymus, parathyroid, thyroid) and specifies cervicothoracic (C3–T2) axial identity, establishing its in vivo developmental necessity and regional specificity.\",\n      \"evidence\": \"Hoxa5-null mice generated by gene targeting; skeletal and organ phenotyping\",\n      \"pmids\": [\"1673020\", \"7901120\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-autonomous versus non-cell-autonomous mechanisms unresolved\", \"Downstream target genes unknown\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Cross-species functional equivalence with Drosophila Sex combs reduced demonstrated conservation of the Hox regulatory hierarchy and HOXA5's ability to activate downstream target genes such as fork head.\",\n      \"evidence\": \"Ectopic expression of mouse Hoxa5 in transgenic Drosophila with phenotypic and target gene analysis\",\n      \"pmids\": [\"8095481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian target genes not yet identified\", \"Mechanism of target specificity unclear\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Domain dissection showed that the homeodomain mediates nuclear targeting and function, while the YPWM motif confers biological specificity through physical interaction with co-factor Pbx1, establishing the structural basis of HOXA5 activity.\",\n      \"evidence\": \"Truncation mutagenesis with transactivation assays and in vitro Pbx1 interaction in cultured cells and transgenic Drosophila\",\n      \"pmids\": [\"8635464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of the HOXA5-Pbx1 complex\", \"Other cofactors not explored\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identification of p53 and progesterone receptor as direct transcriptional targets connected HOXA5 to tumor suppression and hormone signaling, revealing it as a transactivator of clinically relevant promoters in breast cancer.\",\n      \"evidence\": \"Promoter-reporter assays, direct DNA binding by gel-shift, p53-dependent apoptosis assays, bisulfite methylation in primary tumors\",\n      \"pmids\": [\"10879542\", \"10875927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HOXA5 binds p53 promoter in vivo (ChIP) not yet shown at this time\", \"Mechanism of promoter methylation-mediated HOXA5 silencing not elucidated\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Organ-specific knockout studies in stomach, thyroid, and skeleton demonstrated that Hoxa5 functions non-cell-autonomously through mesenchymal-epithelial signaling, controlling Shh/Ihh/FGF10/TGF-β expression in mesenchyme to specify epithelial fates.\",\n      \"evidence\": \"Hoxa5-null mouse phenotyping with molecular marker in situ hybridization in stomach, thyroid, and skeleton; compound Hoxa5;Pax1 mutant epistasis\",\n      \"pmids\": [\"12163410\", \"12815622\", \"11900462\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets in mesenchyme not identified\", \"Whether Hoxa5 binds Shh or FGF10 regulatory regions unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"HOXA5-induced apoptosis was shown to operate through caspases 2 and 8 and to involve physical interaction with the anti-apoptotic protein Twist, providing a mechanistic basis for its p53-dependent and p53-independent pro-apoptotic functions.\",\n      \"evidence\": \"Caspase inhibitor panel and siRNA in inducible HOXA5-expressing breast cancer cells; reciprocal co-immunoprecipitation of HOXA5 and Twist\",\n      \"pmids\": [\"14701762\", \"15545268\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How HOXA5 activates caspase 2/8 transcriptionally or indirectly is unclear\", \"Structural basis of HOXA5-Twist interaction unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"ChIP-confirmed direct binding of HOXA5 to the pleiotrophin promoter, and identification of Cdx4-mediated posterior boundary repression of the Hoxa5 locus, revealed both a direct target gene and the upstream transcriptional logic that restricts Hoxa5 expression along the body axis.\",\n      \"evidence\": \"ChIP and EMSA for pleiotrophin promoter binding; Cdx-binding site mutagenesis in transgenic mouse reporters\",\n      \"pmids\": [\"15757903\", \"15684390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide map of direct HOXA5 targets not yet available\", \"Whether Cdx proteins physically interact with HOXA5 protein unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"In vivo studies established that Hoxa5 functions in lung and mammary mesenchyme to control alveolar myofibroblast positioning and lobulo-alveolar development, while hMLH1 was confirmed as a direct target linking HOXA5 to mismatch repair.\",\n      \"evidence\": \"Hoxa5-null lung histopathology; reciprocal mammary gland transplantation; ChIP at hMLH1 promoter with functional repair assay\",\n      \"pmids\": [\"17003488\", \"16607641\", \"16756717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stromal signals downstream of Hoxa5 in mammary gland unidentified\", \"Genome-wide mismatch repair consequences not assessed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"A RAR-β→HOXA5 regulatory axis was established: RAR-β directly binds a RARE in the HOXA5 3' region, and miR-130a was identified as a direct post-transcriptional repressor of HOXA5, together defining the retinoic acid-responsive circuit controlling HOXA5 expression.\",\n      \"evidence\": \"ChIP for RAR-β at HOXA5 RARE; luciferase reporter for miR-130a binding to HOXA5 3'-UTR; siRNA knockdown of RAR-β\",\n      \"pmids\": [\"17804711\", \"17957028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other RARs that may regulate HOXA5 not tested\", \"Quantitative contribution of miR-130a vs. promoter methylation to HOXA5 silencing unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Post-transcriptional regulation of HOXA5 was further elaborated: HuR stabilizes HOXA5 mRNA upon RA treatment, while c-Myc-driven miR-130a basally represses HOXA5 translation, establishing a dual-layer (miRNA + RBP) control module.\",\n      \"evidence\": \"RNA-binding protein pulldown, miRNA inhibition/overexpression, mRNA stability assays in breast cancer cells\",\n      \"pmids\": [\"23528537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HuR binds HOXA5 mRNA in non-cancer contexts not tested\", \"Additional miRNAs targeting HOXA5 not systematically profiled at this time\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"HOXA5 was placed as an antagonist of Wnt signaling and intestinal stem cell fate, and its promoter was shown to be repressed by JARID1B through H3K4 demethylation, establishing both a pathway-level tumor-suppressive mechanism and an epigenetic silencing axis.\",\n      \"evidence\": \"In vivo gain/loss-of-function in mouse intestine with Wnt reporters and cancer stem cell assays; ChIP for H3K4me at HOXA5 promoter in endothelial-specific Jarid1b knockout mice\",\n      \"pmids\": [\"26678341\", \"26023081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Wnt target genes repressed by HOXA5 not identified\", \"Whether JARID1B regulation of HOXA5 operates in non-endothelial tissues unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Physical association of HOXA5 with STAT3, shown by co-immunoprecipitation, revealed cooperative transactivation of PD-L1, linking HOXA5 to immune checkpoint regulation in melanoma.\",\n      \"evidence\": \"Co-IP of HOXA5 and STAT3, PD-L1 promoter-reporter assay, siRNA knockdown, T-cell killing assay\",\n      \"pmids\": [\"29174371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HOXA5-STAT3 interaction is direct or bridged by DNA unknown\", \"Generalizability beyond melanoma not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"HOTAIR/DNMT3b-mediated DNA methylation was shown to silence the HOXA5 promoter in AML, and HOXA5's transcriptional activation of PPARγ was linked to anti-inflammatory macrophage polarization, broadening its epigenetic regulation and immune-metabolic roles.\",\n      \"evidence\": \"ChIP and methylation assays for DNMT3b at HOXA5 promoter; Hoxa5 overexpression in adipocytes with transcriptome sequencing and macrophage polarization assays\",\n      \"pmids\": [\"31168296\", \"31441588\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct HOXA5 binding to PPARγ promoter not demonstrated\", \"HOTAIR-DNMT3b mechanism based on single lab without reconstitution\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"HINT1 was shown to suppress HOXA5 transcription via PKCβ1/MEK/ERK/YY1 signaling in cardiomyocytes, and ChIP confirmed direct HOXA5 binding to the p53 promoter ATTA motif in fibroblasts, extending HOXA5 function to cardiac hypertrophy and fibrotic disease.\",\n      \"evidence\": \"Co-IP of HINT1-PKCβ1, AAV9-mediated cardiac-specific overexpression/knockdown with transverse aortic constriction; ChIP PCR at p53 promoter in hypertrophic scar fibroblasts\",\n      \"pmids\": [\"34098726\", \"33414417\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether YY1 directly binds the HOXA5 promoter not demonstrated\", \"Cardiac-specific HOXA5 targets beyond TGF-β pathway unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"HOXA5 was shown to recruit DNMT3A to the Slug promoter, increasing its methylation and silencing EMT, establishing a direct epigenetic effector mechanism for HOXA5 in tumor suppression.\",\n      \"evidence\": \"ChIP and methylated DNA immunoprecipitation at Slug promoter in renal cell carcinoma cells\",\n      \"pmids\": [\"36536414\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HOXA5-DNMT3A interaction is direct or mediated through intermediates not shown\", \"Genome-wide scope of HOXA5-directed DNA methylation unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Conditional knockout and knockin of Hoxa5 in kidney proximal tubules demonstrated that HOXA5 directly represses JAG1 transcription, restraining Notch signaling to prevent kidney fibrosis, providing the first tissue-specific conditional genetic evidence for HOXA5 in renal pathology.\",\n      \"evidence\": \"ChIP at JAG1 promoter, conditional Hoxa5 KO/KI in kidney, genome-wide methylation analysis, 5-Aza rescue\",\n      \"pmids\": [\"38521405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HOXA5 represses other Notch ligands in kidney not tested\", \"Upstream signals leading to HOXA5 promoter hypermethylation in fibrotic kidney undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A genome-wide map of direct HOXA5 binding sites (by ChIP-seq in primary tissues), the structural basis of its interactions with Pbx1, Twist, STAT3, and DNMT3A, and the relative contributions of transcriptional versus epigenetic effector mechanisms across tissue contexts remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No published ChIP-seq in primary developmental tissues\", \"No crystal or cryo-EM structure of HOXA5 with any partner\", \"Quantitative contribution of HOXA5 to Wnt vs. Notch vs. p53 pathways in different tissue contexts unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [0, 9, 17, 38, 40]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [8, 9, 17, 18, 28, 31, 39, 40]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 2, 3, 6, 10, 11, 13, 21, 27]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 9, 17, 18, 31, 38, 39, 40]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [8, 14, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [25, 28, 37, 40]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [19, 30, 33]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [31]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [19, 28, 33]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PBX1\", \"TWIST1\", \"STAT3\", \"DNMT3A\", \"ELAVL1\", \"FKHR\", \"FOXA2\"],\n    \"other_free_text\": []\n  }\n}\n```"}