{"gene":"HOXC13","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1998,"finding":"Hoxc13 null mice (generated by gene targeting) completely lack external hair (alopecia), have brittle hair, and show defects in nails and filiform papillae, establishing Hoxc13 as essential for hair, nail, and filiform papilla development.","method":"Gene targeting / loss-of-function knockout mouse with phenotypic readout","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotype, replicated across multiple subsequent studies in multiple species","pmids":["9420327"],"is_preprint":false},{"year":2001,"finding":"Transgenic overexpression of Hoxc13 in differentiating keratinocytes causes alopecia and downregulation of a novel cluster of hair keratin-associated protein (KAP) genes on mouse chromosome 16; Hoxc13/lacZ reporter analysis indicates negative autoregulatory feedback control of Hoxc13 expression levels.","method":"Transgenic overexpression with large-scale differential gene expression analysis (DNA chip) and reporter gene assay","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — transgenic KO/OE phenotype with genome-wide target identification and reporter assay, replicated in subsequent studies","pmids":["11290294"],"is_preprint":false},{"year":2004,"finding":"HOXC13 directly binds to cognate sites in the promoters of Krtap16 KAP genes via sequence-specific protein-DNA interaction, supporting a regulatory relationship between Hoxc13 and these hair structural genes.","method":"Electrophoretic mobility shift assay (EMSA) / DNA binding assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro EMSA demonstrating sequence-specific binding, single lab, supported by expression data in transgenic mice","pmids":["15385554"],"is_preprint":false},{"year":2005,"finding":"HOXC13 binds at least one cognate site in the Crisp1 promoter (confirmed by EMSA), and Crisp1 is downregulated >20-fold in Hoxc13-overexpressing mice, establishing Crisp1 as a downstream regulatory target of Hoxc13 in the hair medulla.","method":"DNA chip expression analysis and EMSA (electrophoretic mobility shift assay)","journal":"The journal of investigative dermatology. Symposium proceedings","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — EMSA plus expression phenotype in transgenic mice, single lab","pmids":["16382673"],"is_preprint":false},{"year":2005,"finding":"HOXC13-controlled activation of early hair keratin genes hHa5 and hHa2 in hair follicles does not involve TALE proteins MEIS1, MEIS2, PREP1, or PREP2 as cofactors, because these proteins are exclusively cytoplasmically localized in the relevant follicle compartments where HOXC13 is nuclear.","method":"RT-PCR for TALE transcripts in hair follicle; immunolocalization of TALE proteins and HOXC13 in hair follicle sections","journal":"Archives of dermatological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment with functional implication (negative finding on cofactor requirement), single lab, two methods","pmids":["16292560"],"is_preprint":false},{"year":2006,"finding":"HOXC13 directly binds Foxq1 gene regulatory regions and activates its transcription; Foxq1 and downstream medulla-specific genes are downregulated upon Hoxc13 overexpression, placing Hoxc13 upstream of Foxq1 in a pathway controlling hair medulla differentiation.","method":"Gene array analysis, co-transfection reporter assay, chromatin immunoprecipitation (ChIP), DNA binding studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP, co-transfection, and DNA binding studies in combination; epistasis supported by satin (Foxq1) mouse data","pmids":["16835220"],"is_preprint":false},{"year":2007,"finding":"HOXC13 physically interacts with the ETS domain of PU.1 (SPI1) through a region encompassing the C-terminal part of the homeodomain and the most C-terminal region of HOXC13, and enhances PU.1 transcriptional activity; enforced HOXC13 expression in MEL cells suppresses beta-globin expression and inhibits erythroid differentiation.","method":"Co-immunoprecipitation / protein interaction mapping, transcriptional reporter assays, enforced expression in MEL cells with beta-globin readout","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction mapping with functional readout (beta-globin suppression), single lab","pmids":["18076876"],"is_preprint":false},{"year":2009,"finding":"HOXC13 is a member of human DNA replication complexes: it co-localizes with replication foci in early-S-phase cells (driven by its homeodomain), binds the lamin B2 replication origin and origins near TOP1 and MCM4 genes in asynchronously growing cells by ChIP, but not in G0 resting cells.","method":"Fluorescent fusion-protein live imaging, ChIP analysis at specific replication origins","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by live imaging with domain-mapping (homeodomain requirement), ChIP at specific loci, single lab","pmids":["19182517"],"is_preprint":false},{"year":2009,"finding":"HOXC13 is transcriptionally activated by estrogen (17β-estradiol) via estrogen-response elements (ERE1, ERE2) in its promoter; ERα and ERβ are required for this activation; MLL1-MLL4 histone methylases are recruited to the HOXC13 promoter in an estrogen-dependent, ER-dependent manner, and MLL3 knockdown suppresses E2-induced HOXC13 activation.","method":"ChIP assay, knockdown (siRNA) of ERα, ERβ, MLL1-MLL4, promoter reporter assays","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — ChIP + siRNA knockdown + reporter assays, multiple orthogonal methods in single study","pmids":["19922474"],"is_preprint":false},{"year":2010,"finding":"HOXC13 directly activates Foxn1 transcription in hair follicles; Foxn1 is significantly downregulated in Hoxc13-null mice; co-transfection and ChIP assays confirm direct transcriptional control of Foxn1 by HOXC13, placing HOXC13 upstream of FOXN1 in a regulatory cascade controlling terminal differentiation markers in keratinocytes.","method":"DNA microarray, co-transfection reporter assay, ChIP, histological comparison of Hoxc13- and Foxn1-mutant mice","journal":"The Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 1 / Strong — ChIP + co-transfection + genetic epistasis (null mouse phenotypic comparison), multiple orthogonal methods","pmids":["21191399"],"is_preprint":false},{"year":2012,"finding":"Loss-of-function mutations in HOXC13 (nonsense mutation c.390C>A / p.Tyr130* and homozygous microdeletion of exon 1) cause autosomal-recessive pure hair and nail ectodermal dysplasia in humans; dramatically reduced mRNA levels and nearly absent protein staining in hair follicles indicate nonsense-mediated mRNA decay as mechanism; four known HOXC13 target genes are markedly decreased in affected skin.","method":"Whole-exome sequencing, RT-PCR expression analysis, protein immunostaining in patient skin biopsies","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetic loss-of-function with molecular validation (mRNA decay, protein absence, target gene expression), two independent families","pmids":["23063621"],"is_preprint":false},{"year":2012,"finding":"Antisense oligonucleotide-mediated knockdown of HOXC13 induces cell cycle arrest (G1) and apoptosis in colon cancer cells, and reduces cyclin expression; overexpression of HOXC13 induces 3D colony formation in soft agar, demonstrating roles in cell proliferation and survival.","method":"Antisense oligonucleotide knockdown, cell viability assays, soft agar colony formation assay, flow cytometry","journal":"RSC advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined cellular phenotype (apoptosis, G1 arrest, cyclin downregulation) and OE with colony formation, single lab","pmids":["23495364"],"is_preprint":false},{"year":2013,"finding":"A homozygous frameshift mutation in HOXC13 (c.355delC; p.Leu119Trpfs*20) causes protein mislocalization to the cytoplasm and failure to upregulate target gene promoter activities, establishing that correct nuclear localization of HOXC13 is required for its transcriptional function.","method":"Sequencing, expression studies in cultured cells (localization and promoter reporter assay of mutant vs wild-type HOXC13)","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro functional assay with mutant protein (localization + promoter reporter), single lab","pmids":["23315978"],"is_preprint":false},{"year":2015,"finding":"YAP (Hippo pathway transcriptional coactivator) regulates Hoxc13 expression in oral, dental, and skin epithelial tissues; ChIP assay indicates YAP regulates Hoxc13 through TEAD transcription factors; Hoxc13 is functionally involved in YAP-regulated epithelial progenitor cell proliferation (sphere formation assay).","method":"RNA-Seq, real-time PCR, in situ hybridization, ChIP assay, sphere formation assay in Yap conditional KO and transgenic mice","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP + multiple gene expression methods + functional sphere assay, single lab","pmids":["25691658"],"is_preprint":false},{"year":2015,"finding":"Hoxc13 regulates the hair cycle: shRNA-mediated knockdown of Hoxc13 promotes premature catagen entry (shortened hair, increased apoptosis, inhibited proliferation), while recombinant Hoxc13 polypeptide injection prolongs anagen; mechanistically, p-Smad2 (active TGF-β1 signaling) is upregulated by Hoxc13 knockdown and downregulated by Hoxc13 injection, suggesting Hoxc13 blocks anagen-to-catagen transition by inhibiting TGF-β1 signaling.","method":"shRNA knockdown in vivo, recombinant polypeptide injection, TUNEL assay, proliferation markers, immunostaining for p-Smad2","journal":"Cell and tissue research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KD and gain-of-function with defined molecular readout (p-Smad2), single lab","pmids":["26553656"],"is_preprint":false},{"year":2015,"finding":"SOAT1 (sterol O-acyltransferase 1) is co-expressed with HOXC13 in the medulla of hair follicles; SOAT1 is absent from the defective medulla of Hoxc13-null mice; ChIP assay shows HOXC13 binding to the Soat1 upstream control region, supporting Soat1 as a downstream regulatory target of HOXC13.","method":"Immunohistochemistry, DNA microarray (prior data), ChIP assay","journal":"Experimental and molecular pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP evidence for direct binding plus KO phenotype data, single lab","pmids":["26321246"],"is_preprint":false},{"year":2016,"finding":"HOXC13 and SPI1 (PU.1) synergistically and dose-dependently activate transcription of the proto-oncogene Zfp521 through specific regions of the Zfp521 promoter; this regulatory relationship is supported in vivo in transgenic mice overexpressing Hoxc13 in fetal liver, where Zfp521 expression correlates with Hoxc13 levels.","method":"Co-transfection reporter assay, promoter deletion analysis, transgenic mouse expression correlation","journal":"Genesis (New York, N.Y. : 2000)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-transfection reporter assay with in vivo correlation, single lab, two methods","pmids":["27506447"],"is_preprint":false},{"year":2017,"finding":"HOXC13 directly represses transcription of CASP3 by binding to the CASP3 promoter region (ChIP); HOXC13 knockdown upregulates CASP3 and induces apoptosis in ESCC cells; miR-503 directly targets the HOXC13 3'UTR to downregulate HOXC13.","method":"ChIP assay, knockdown experiments, luciferase reporter (miR-503 targeting), apoptosis assays","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct binding at CASP3 promoter with functional apoptosis readout, single lab","pmids":["29168599"],"is_preprint":false},{"year":2017,"finding":"HOXC13 knockdown induces G1-phase arrest in lung adenocarcinoma cells by downregulating CCND1 and CCNE1; conversely, HOXC13 overexpression promotes G1-to-S transition by upregulating CCND1 and CCNE1; miR-141 directly targets the HOXC13 3'UTR to suppress its expression.","method":"siRNA knockdown, overexpression, cell cycle analysis (flow cytometry), luciferase 3'UTR reporter assay","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE with defined cell cycle readout and identified downstream effectors (CCND1/CCNE1), single lab","pmids":["28979806"],"is_preprint":false},{"year":2018,"finding":"HOXC13 regulates keratin gene expression differentially: in cashmere goat dermal papilla cells, HOXC13 upregulates promoter activity of KRT84 and KRT38 but downregulates promoter activity of KRT1 and KRT2; two SNPs in the HOXC13 homeodomain (c.812A>G and c.929A>C) abolish its regulatory function on keratins without altering protein expression; HOXC13 negatively auto-regulates its own promoter; LEF1 positively regulates HOXC13 promoter activity.","method":"Dual-luciferase reporter assay in HEK293T and dermal papilla cells, promoter-GFP overexpression system, site-directed mutagenesis (SNP analysis)","journal":"BMC genomics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — luciferase reporter with mutagenesis in two cell types, single lab, multiple readouts","pmids":["30139327"],"is_preprint":false},{"year":2010,"finding":"BMI-1 knockdown (via shRNA) in HeLa cells leads to significant upregulation of HOXC13 mRNA, indicating that BMI-1 (Polycomb group) transcriptionally represses HOXC13 expression.","method":"shRNA-mediated knockdown of BMI-1, RT-PCR for HOXC13 mRNA","journal":"Medical oncology (Northwood, London, England)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (mRNA measurement post-KD), single lab, indirect evidence of repression","pmids":["20661663"],"is_preprint":false},{"year":2021,"finding":"In a mouse model of cerebral ischemia/reperfusion, LOC102640519 positively regulates HOXC13 expression (confirmed by ChIP assay showing LOC102640519's regulation of HOXC13), and elevated HOXC13 in turn negatively regulates ZO-1, Occludin, and Claudin-5 expression (confirmed by luciferase reporter and RNA pulldown), contributing to blood-brain-barrier disruption.","method":"ChIP assay, luciferase reporter assay, RNA pulldown, FISH, Western blot in MCAO mouse model and OGD/R cell model","journal":"Experimental cell research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ChIP and reporter assays in a specific disease context, complex lncRNA/protein mechanism, single lab","pmids":["29842876"],"is_preprint":false},{"year":2023,"finding":"Silencing HOXC13 in prostate cancer cells (22RV1 and DU145) induces DNA damage and activates the cGAS/STING/IRF3 pathway, upregulating IFN-β, CCL2, CCL5, and CXCL10 transcription; high HOXC13 expression suppresses γδ T cell and plasma cell infiltration and recruits M2 macrophages.","method":"siRNA knockdown, DNA damage assays, cGAS/STING pathway activation markers, immune infiltration analysis (CIBERSORT), qRT-PCR for immune factors","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined molecular pathway activation (cGAS/STING/IRF3) and multiple downstream readouts, single lab","pmids":["38057852"],"is_preprint":false},{"year":2023,"finding":"HOXC13 directly binds the TIMM13 promoter and drives its transcription in osteosarcoma cells; HOXC13 silencing reduces TIMM13 expression, causing mitochondrial dysfunction (depolarization, ROS, ATP depletion, lipid peroxidation) and inhibiting Akt-mTOR signaling, proliferation, and migration.","method":"ChIP, HOXC13 silencing with TIMM13 expression readout, TIMM13 KO xenograft model, mitochondrial function assays, Akt-mTOR pathway markers","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP for direct binding plus functional KO phenotype with defined downstream pathway, single lab","pmids":["37407582"],"is_preprint":false},{"year":2023,"finding":"HOXC13 positively regulates DNMT3A transcription in breast cancer cells (predicted by JASPAR database and confirmed by functional assays); HOXC13 knockdown reduces proliferation, migration, invasion, EMT, and glycolysis in BC cells.","method":"JASPAR binding site prediction, cell transfection (knockdown/OE), CCK-8, flow cytometry, Transwell, XF96 extracellular flux analyzer","journal":"Experimental and therapeutic medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — binding site is computational prediction; functional link to DNMT3A is inferred from co-expression changes, not confirmed by direct binding assay; single lab","pmids":["37614427"],"is_preprint":false},{"year":2023,"finding":"ChIP-Seq in rabbit dermal papilla cells overexpressing HOXC13 identifies 9,670 genomic binding peaks; HOXC13 binds the PRKACB promoter region (−1596 to −1107 bp) and inhibits PRKACB transcription (confirmed by dual-luciferase reporter assay); PRKACB overexpression modulates BCL2, WNT2, LEF1, and SFRP2, inhibits DPC proliferation, and promotes apoptosis.","method":"ChIP-Seq, dual-luciferase reporter assay, RT-qPCR, CCK-8, flow cytometry","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — ChIP-Seq genome-wide binding with targeted luciferase validation at PRKACB promoter, single lab","pmids":["38381512"],"is_preprint":false},{"year":2024,"finding":"HOXC13 is required for the stable maintenance of HPV16, HPV52, and HPV58 genomes in keratinocytes; CRISPR-Cas9 knockout of HOXC13 causes progressive loss of these viral genome copy numbers over passages, whereas HPV18 genome stability is HOXC13-independent.","method":"CRISPR-Cas9 KO of HOXC13 in NIKS cells, transfection of HPV genomes, quantitative copy number monitoring over cell passages","journal":"Virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean CRISPR KO with quantitative viral genome readout across multiple HPV genotypes, single lab","pmids":["38914027"],"is_preprint":false},{"year":2024,"finding":"Hoxc13 is required for the expression of hair keratin homologs in the cornified claws of Xenopus frogs; hoxc13 deletion abolishes hair keratin homolog expression and abrogates cornified claw development; Hoxc13 binding sites are conserved in the promoters of these keratin genes across amphibians and mammals, indicating an ancestral evolutionary role.","method":"CRISPR/Cas9 knockout of hoxc13 in X. tropicalis, gene expression analysis, promoter binding site conservation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo KO with defined molecular and morphological phenotype, promoter binding site conservation, ortholog confirmed across species","pmids":["38499530"],"is_preprint":false},{"year":2024,"finding":"A missense variant p.Arg311Trp in the homeobox domain of HOXC13 causes PHNED by decreasing HOXC13 protein stability (rather than altering DNA-binding affinity), as revealed by in vitro overexpression assays and computational structural modeling showing loss of interhelical connection between Arg311 (α-helix 3) and Glu276 (α-helix 1).","method":"In vitro overexpression assay (protein stability), in silico structural prediction, comparison with previously reported variants","journal":"Human mutation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — in vitro overexpression with in silico modeling, no in vitro reconstitution or mutagenesis rescue experiment; single lab","pmids":["40225922"],"is_preprint":false},{"year":2021,"finding":"In Hoxc13-null mice, expression of Foxn1, Krt85, and Krt35 is decreased, confirming these genes as downstream targets of HOXC13 in hair follicle differentiation; Hoxc13-null pigs show similar reductions in Foxn1, Krt85, and Krt35 expression, with absent normal hair and reduced/disarrayed follicles.","method":"CRISPR/Cas9 knockout pig generation, RT-PCR for target gene expression, histological analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — independent KO in large animal model confirms target gene regulation, multiple downstream targets validated","pmids":["28011715"],"is_preprint":false},{"year":2024,"finding":"RHOXF2 physically interacts with HOXC13 (confirmed by co-immunoprecipitation and GST pulldown); RHOXF2 knockdown suppresses HOXC13 expression; HOXC13 overexpression rescues the effects of RHOXF2 knockdown on TNBC cell proliferation, invasion, and Wnt2/β-catenin pathway activity.","method":"Co-immunoprecipitation, GST pulldown, overexpression/knockdown with rescue experiment, Wnt pathway markers","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal protein interaction (Co-IP + GST pulldown) with functional rescue experiment, single lab","pmids":["38697448"],"is_preprint":false}],"current_model":"HOXC13 is a homeodomain transcription factor that binds specific DNA sequences in promoters of hair keratin (KRT) and keratin-associated protein (KAP) genes to regulate their expression (activating some, repressing others), directly activates downstream transcription factors FOXN1 and FOXQ1 to coordinate hair follicle differentiation, negatively auto-regulates its own expression, is recruited to DNA replication origins via its homeodomain, is transcriptionally activated by estrogen through ERα/ERβ and MLL histone methyltransferases, physically interacts with PU.1/SPI1 to modulate hematopoietic gene expression, regulates the hair cycle by suppressing TGF-β1/Smad2 signaling, and loss-of-function mutations in its homeodomain cause pure hair and nail ectodermal dysplasia by reducing DNA-binding activity, inducing protein mislocalization, or decreasing protein stability."},"narrative":{"mechanistic_narrative":"HOXC13 is a homeodomain transcription factor that serves as a master regulator of hair, nail, and filiform papilla development, with knockout animals from mice to pigs to frogs all displaying alopecia, brittle hair, and defective cornified appendages [PMID:9420327, PMID:28011715, PMID:38499530]. It executes this program by binding sequence-specific cognate sites in the promoters of hair structural genes, directly activating some keratin-associated protein (KAP) and keratin genes while repressing others, and by negatively autoregulating its own promoter [PMID:15385554, PMID:30139327, PMID:11290294]. HOXC13 sits atop a follicle differentiation cascade, directly activating the forkhead transcription factors FOXQ1 and FOXN1 through ChIP- and reporter-validated binding to coordinate medulla and terminal keratinocyte differentiation [PMID:16835220, PMID:21191399]. Additional medulla-specific targets including Crisp1 and Soat1 are directly bound and regulated by HOXC13 [PMID:16382673, PMID:26321246], and its control of the hair cycle involves suppression of TGF-β1/p-Smad2 signaling to delay the anagen-to-catagen transition [PMID:26553656]. Beyond its developmental role, HOXC13 associates with DNA replication complexes, co-localizing with early-S-phase replication foci and binding defined origins via its homeodomain [PMID:19182517], and physically interacts with the ETS factor PU.1/SPI1 to modulate hematopoietic gene expression [PMID:18076876, PMID:27506447]. Its own expression is induced by estrogen via ERα/ERβ and MLL histone methyltransferases [PMID:19922474] and is constrained by upstream regulators including YAP/TEAD and Polycomb BMI-1 [PMID:25691658]. Loss-of-function HOXC13 mutations—nonsense, frameshift, and homeodomain variants—cause autosomal-recessive pure hair and nail ectodermal dysplasia, acting through nonsense-mediated decay, cytoplasmic mislocalization, or loss of DNA-binding and target activation [PMID:23063621, PMID:23315978]. In multiple cancers HOXC13 is co-opted as a pro-proliferative factor controlling cell-cycle and apoptotic targets [PMID:23495364, PMID:28979806, PMID:29168599].","teleology":[{"year":1998,"claim":"Established that HOXC13 is genetically essential for the development of hair, nails, and filiform papillae, defining its core biological role.","evidence":"Gene-targeted knockout mouse with phenotypic analysis","pmids":["9420327"],"confidence":"High","gaps":["Did not identify direct transcriptional targets","No molecular mechanism for differentiation control"]},{"year":2001,"claim":"Linked HOXC13 dosage to hair keratin-associated protein gene expression and revealed negative autoregulation, showing it acts as a tunable transcriptional regulator of structural genes.","evidence":"Transgenic overexpression with DNA chip expression profiling and lacZ reporter","pmids":["11290294"],"confidence":"High","gaps":["Direct vs indirect regulation of KAP genes not distinguished","Mechanism of autoregulation not mapped"]},{"year":2004,"claim":"Demonstrated that HOXC13 binds KAP gene promoters directly and sequence-specifically, converting correlative expression data into a direct regulatory relationship.","evidence":"EMSA on Krtap16 promoter sites","pmids":["15385554"],"confidence":"Medium","gaps":["In vitro binding only","Activation vs repression output at native loci unresolved"]},{"year":2006,"claim":"Placed HOXC13 upstream of FOXQ1 in a medulla differentiation pathway, establishing it as an apical regulator of a downstream transcription factor cascade.","evidence":"Gene array, co-transfection reporter, ChIP, DNA binding","pmids":["16835220"],"confidence":"High","gaps":["Cofactors mediating activation not identified"]},{"year":2005,"claim":"Showed HOXC13 functions without TALE cofactors MEIS/PREP in the follicle compartments where it activates early hair keratins, ruling out a canonical HOX cofactor requirement here.","evidence":"RT-PCR and immunolocalization of TALE proteins and HOXC13 in hair follicle","pmids":["16292560"],"confidence":"Medium","gaps":["Alternative cofactors not identified","Negative localization finding only"]},{"year":2009,"claim":"Revealed a non-transcriptional role: HOXC13 associates with DNA replication complexes and origins through its homeodomain in a cell-cycle-dependent manner.","evidence":"Fluorescent fusion live imaging and ChIP at defined replication origins","pmids":["19182517"],"confidence":"Medium","gaps":["Functional consequence for replication not demonstrated","Single lab"]},{"year":2009,"claim":"Identified estrogen/ER and MLL methyltransferases as upstream activators of HOXC13 transcription, embedding it in hormonal and chromatin-modifying control.","evidence":"ChIP, siRNA of ERα/ERβ/MLL1-4, promoter reporters","pmids":["19922474"],"confidence":"High","gaps":["Physiological context of estrogen regulation unclear","Tissue specificity not addressed"]},{"year":2010,"claim":"Extended the regulatory cascade by showing HOXC13 directly activates FOXN1, connecting it to terminal keratinocyte differentiation programs.","evidence":"Microarray, co-transfection, ChIP, and Hoxc13/Foxn1 null mouse comparison","pmids":["21191399"],"confidence":"High","gaps":["Full set of FOXN1-dependent effectors not mapped"]},{"year":2012,"claim":"Established HOXC13 as the causative gene for autosomal-recessive pure hair and nail ectodermal dysplasia, validating its essential human function.","evidence":"Whole-exome sequencing, RT-PCR, immunostaining in two families","pmids":["23063621"],"confidence":"High","gaps":["Genotype-phenotype correlation across mutation types not yet defined"]},{"year":2013,"claim":"Showed a frameshift mutation causes cytoplasmic mislocalization and loss of target activation, establishing that nuclear localization is required for HOXC13 function.","evidence":"Sequencing plus localization and promoter reporter assays of mutant vs wild-type","pmids":["23315978"],"confidence":"Medium","gaps":["NLS not precisely mapped","Single lab in vitro assay"]},{"year":2007,"claim":"Mapped a direct physical interaction between HOXC13 and PU.1/SPI1 with functional consequences for erythroid differentiation, revealing a hematopoietic role distinct from hair biology.","evidence":"Reciprocal interaction mapping, reporter assays, enforced expression in MEL cells","pmids":["18076876"],"confidence":"Medium","gaps":["In vivo hematopoietic relevance limited","Single lab"]},{"year":2016,"claim":"Showed HOXC13 and SPI1 synergistically activate the proto-oncogene Zfp521, reinforcing the hematopoietic partnership with a defined transcriptional target.","evidence":"Co-transfection reporter, promoter deletion, transgenic mouse correlation","pmids":["27506447"],"confidence":"Medium","gaps":["Direct binding at Zfp521 promoter by HOXC13 vs SPI1 not separated"]},{"year":2015,"claim":"Identified additional direct hair-medulla targets (Soat1) and an upstream YAP/TEAD axis controlling HOXC13 in epithelial progenitor proliferation, broadening its tissue regulatory network.","evidence":"ChIP and IHC for Soat1; RNA-Seq, ChIP, sphere assay in Yap mutant mice","pmids":["26321246","25691658"],"confidence":"Medium","gaps":["Functional epistasis of YAP→HOXC13 not fully resolved"]},{"year":2015,"claim":"Demonstrated HOXC13 controls hair-cycle timing by suppressing TGF-β1/p-Smad2 signaling to delay catagen entry, adding a signaling-modulation function.","evidence":"shRNA knockdown, recombinant polypeptide injection, p-Smad2 immunostaining in vivo","pmids":["26553656"],"confidence":"Medium","gaps":["Direct vs indirect effect on TGF-β1 pathway not established"]},{"year":2018,"claim":"Resolved that HOXC13 differentially activates and represses distinct keratin promoters and is positively regulated by LEF1, while homeodomain SNPs abolish regulatory function without changing protein levels.","evidence":"Dual-luciferase reporters in two cell types, promoter-GFP system, site-directed mutagenesis","pmids":["30139327"],"confidence":"Medium","gaps":["Mechanism of bidirectional output at different promoters unknown"]},{"year":2021,"claim":"Confirmed conserved downstream targets (Foxn1, Krt85, Krt35) in an independent large-animal knockout, strengthening the cross-species HOXC13 follicle program.","evidence":"CRISPR/Cas9 knockout pig, RT-PCR, histology","pmids":["28011715"],"confidence":"Medium","gaps":["No new mechanism beyond target confirmation"]},{"year":2017,"claim":"Implicated HOXC13 as a pro-survival, pro-proliferative factor in cancer through direct repression of CASP3 and control of cyclins, regulated by miR-503 and miR-141.","evidence":"ChIP, knockdown/overexpression, apoptosis and cell-cycle assays, 3'UTR luciferase","pmids":["29168599","28979806"],"confidence":"Medium","gaps":["Whether oncogenic role uses the same DNA-binding logic as developmental targets unclear"]},{"year":2024,"claim":"Established the ancestral evolutionary depth of HOXC13's keratin-regulatory role by showing it controls hair keratin homolog expression and cornified claw formation in frogs with conserved binding sites.","evidence":"CRISPR/Cas9 knockout in X. tropicalis, expression analysis, promoter conservation","pmids":["38499530"],"confidence":"High","gaps":["Conservation of the full downstream cascade across taxa not tested"]},{"year":2024,"claim":"Expanded HOXC13's roles to viral genome maintenance and tumor-immune modulation, and added genome-wide binding data plus new physical partner RHOXF2.","evidence":"CRISPR KO with HPV copy-number tracking; cGAS/STING immune profiling; ChIP-Seq; Co-IP/GST pulldown with rescue","pmids":["38914027","38057852","38381512","38697448"],"confidence":"Medium","gaps":["Mechanism by which HOXC13 supports HPV genome maintenance unknown","Direct binding underlying immune effects not mapped"]},{"year":null,"claim":"How HOXC13 selects between transcriptional activation and repression at different target promoters, and what cofactors substitute for canonical TALE proteins in follicle compartments, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of HOXC13 bound to native target promoters","Activation/repression cofactor identity unknown","Connection between developmental and oncogenic target repertoires unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,5,9,19,25]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,3,5,7,25]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[4,7,12]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,5,9,19]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,5,9,27]},{"term_id":"R-HSA-69306","term_label":"DNA Replication","supporting_discovery_ids":[7]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[11,18]}],"complexes":[],"partners":["SPI1","RHOXF2","ESR1","ESR2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P31276","full_name":"Homeobox protein Hox-C13","aliases":["Homeobox protein Hox-3G"],"length_aa":330,"mass_kda":35.4,"function":"Transcription factor which plays a role in hair follicle differentiation. 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readout\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotype, replicated across multiple subsequent studies in multiple species\",\n      \"pmids\": [\"9420327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Transgenic overexpression of Hoxc13 in differentiating keratinocytes causes alopecia and downregulation of a novel cluster of hair keratin-associated protein (KAP) genes on mouse chromosome 16; Hoxc13/lacZ reporter analysis indicates negative autoregulatory feedback control of Hoxc13 expression levels.\",\n      \"method\": \"Transgenic overexpression with large-scale differential gene expression analysis (DNA chip) and reporter gene assay\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transgenic KO/OE phenotype with genome-wide target identification and reporter assay, replicated in subsequent studies\",\n      \"pmids\": [\"11290294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HOXC13 directly binds to cognate sites in the promoters of Krtap16 KAP genes via sequence-specific protein-DNA interaction, supporting a regulatory relationship between Hoxc13 and these hair structural genes.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA) / DNA binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro EMSA demonstrating sequence-specific binding, single lab, supported by expression data in transgenic mice\",\n      \"pmids\": [\"15385554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"HOXC13 binds at least one cognate site in the Crisp1 promoter (confirmed by EMSA), and Crisp1 is downregulated >20-fold in Hoxc13-overexpressing mice, establishing Crisp1 as a downstream regulatory target of Hoxc13 in the hair medulla.\",\n      \"method\": \"DNA chip expression analysis and EMSA (electrophoretic mobility shift assay)\",\n      \"journal\": \"The journal of investigative dermatology. Symposium proceedings\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — EMSA plus expression phenotype in transgenic mice, single lab\",\n      \"pmids\": [\"16382673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"HOXC13-controlled activation of early hair keratin genes hHa5 and hHa2 in hair follicles does not involve TALE proteins MEIS1, MEIS2, PREP1, or PREP2 as cofactors, because these proteins are exclusively cytoplasmically localized in the relevant follicle compartments where HOXC13 is nuclear.\",\n      \"method\": \"RT-PCR for TALE transcripts in hair follicle; immunolocalization of TALE proteins and HOXC13 in hair follicle sections\",\n      \"journal\": \"Archives of dermatological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment with functional implication (negative finding on cofactor requirement), single lab, two methods\",\n      \"pmids\": [\"16292560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"HOXC13 directly binds Foxq1 gene regulatory regions and activates its transcription; Foxq1 and downstream medulla-specific genes are downregulated upon Hoxc13 overexpression, placing Hoxc13 upstream of Foxq1 in a pathway controlling hair medulla differentiation.\",\n      \"method\": \"Gene array analysis, co-transfection reporter assay, chromatin immunoprecipitation (ChIP), DNA binding studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP, co-transfection, and DNA binding studies in combination; epistasis supported by satin (Foxq1) mouse data\",\n      \"pmids\": [\"16835220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"HOXC13 physically interacts with the ETS domain of PU.1 (SPI1) through a region encompassing the C-terminal part of the homeodomain and the most C-terminal region of HOXC13, and enhances PU.1 transcriptional activity; enforced HOXC13 expression in MEL cells suppresses beta-globin expression and inhibits erythroid differentiation.\",\n      \"method\": \"Co-immunoprecipitation / protein interaction mapping, transcriptional reporter assays, enforced expression in MEL cells with beta-globin readout\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction mapping with functional readout (beta-globin suppression), single lab\",\n      \"pmids\": [\"18076876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HOXC13 is a member of human DNA replication complexes: it co-localizes with replication foci in early-S-phase cells (driven by its homeodomain), binds the lamin B2 replication origin and origins near TOP1 and MCM4 genes in asynchronously growing cells by ChIP, but not in G0 resting cells.\",\n      \"method\": \"Fluorescent fusion-protein live imaging, ChIP analysis at specific replication origins\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by live imaging with domain-mapping (homeodomain requirement), ChIP at specific loci, single lab\",\n      \"pmids\": [\"19182517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HOXC13 is transcriptionally activated by estrogen (17β-estradiol) via estrogen-response elements (ERE1, ERE2) in its promoter; ERα and ERβ are required for this activation; MLL1-MLL4 histone methylases are recruited to the HOXC13 promoter in an estrogen-dependent, ER-dependent manner, and MLL3 knockdown suppresses E2-induced HOXC13 activation.\",\n      \"method\": \"ChIP assay, knockdown (siRNA) of ERα, ERβ, MLL1-MLL4, promoter reporter assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — ChIP + siRNA knockdown + reporter assays, multiple orthogonal methods in single study\",\n      \"pmids\": [\"19922474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HOXC13 directly activates Foxn1 transcription in hair follicles; Foxn1 is significantly downregulated in Hoxc13-null mice; co-transfection and ChIP assays confirm direct transcriptional control of Foxn1 by HOXC13, placing HOXC13 upstream of FOXN1 in a regulatory cascade controlling terminal differentiation markers in keratinocytes.\",\n      \"method\": \"DNA microarray, co-transfection reporter assay, ChIP, histological comparison of Hoxc13- and Foxn1-mutant mice\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ChIP + co-transfection + genetic epistasis (null mouse phenotypic comparison), multiple orthogonal methods\",\n      \"pmids\": [\"21191399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Loss-of-function mutations in HOXC13 (nonsense mutation c.390C>A / p.Tyr130* and homozygous microdeletion of exon 1) cause autosomal-recessive pure hair and nail ectodermal dysplasia in humans; dramatically reduced mRNA levels and nearly absent protein staining in hair follicles indicate nonsense-mediated mRNA decay as mechanism; four known HOXC13 target genes are markedly decreased in affected skin.\",\n      \"method\": \"Whole-exome sequencing, RT-PCR expression analysis, protein immunostaining in patient skin biopsies\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetic loss-of-function with molecular validation (mRNA decay, protein absence, target gene expression), two independent families\",\n      \"pmids\": [\"23063621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Antisense oligonucleotide-mediated knockdown of HOXC13 induces cell cycle arrest (G1) and apoptosis in colon cancer cells, and reduces cyclin expression; overexpression of HOXC13 induces 3D colony formation in soft agar, demonstrating roles in cell proliferation and survival.\",\n      \"method\": \"Antisense oligonucleotide knockdown, cell viability assays, soft agar colony formation assay, flow cytometry\",\n      \"journal\": \"RSC advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined cellular phenotype (apoptosis, G1 arrest, cyclin downregulation) and OE with colony formation, single lab\",\n      \"pmids\": [\"23495364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A homozygous frameshift mutation in HOXC13 (c.355delC; p.Leu119Trpfs*20) causes protein mislocalization to the cytoplasm and failure to upregulate target gene promoter activities, establishing that correct nuclear localization of HOXC13 is required for its transcriptional function.\",\n      \"method\": \"Sequencing, expression studies in cultured cells (localization and promoter reporter assay of mutant vs wild-type HOXC13)\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro functional assay with mutant protein (localization + promoter reporter), single lab\",\n      \"pmids\": [\"23315978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"YAP (Hippo pathway transcriptional coactivator) regulates Hoxc13 expression in oral, dental, and skin epithelial tissues; ChIP assay indicates YAP regulates Hoxc13 through TEAD transcription factors; Hoxc13 is functionally involved in YAP-regulated epithelial progenitor cell proliferation (sphere formation assay).\",\n      \"method\": \"RNA-Seq, real-time PCR, in situ hybridization, ChIP assay, sphere formation assay in Yap conditional KO and transgenic mice\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP + multiple gene expression methods + functional sphere assay, single lab\",\n      \"pmids\": [\"25691658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Hoxc13 regulates the hair cycle: shRNA-mediated knockdown of Hoxc13 promotes premature catagen entry (shortened hair, increased apoptosis, inhibited proliferation), while recombinant Hoxc13 polypeptide injection prolongs anagen; mechanistically, p-Smad2 (active TGF-β1 signaling) is upregulated by Hoxc13 knockdown and downregulated by Hoxc13 injection, suggesting Hoxc13 blocks anagen-to-catagen transition by inhibiting TGF-β1 signaling.\",\n      \"method\": \"shRNA knockdown in vivo, recombinant polypeptide injection, TUNEL assay, proliferation markers, immunostaining for p-Smad2\",\n      \"journal\": \"Cell and tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KD and gain-of-function with defined molecular readout (p-Smad2), single lab\",\n      \"pmids\": [\"26553656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SOAT1 (sterol O-acyltransferase 1) is co-expressed with HOXC13 in the medulla of hair follicles; SOAT1 is absent from the defective medulla of Hoxc13-null mice; ChIP assay shows HOXC13 binding to the Soat1 upstream control region, supporting Soat1 as a downstream regulatory target of HOXC13.\",\n      \"method\": \"Immunohistochemistry, DNA microarray (prior data), ChIP assay\",\n      \"journal\": \"Experimental and molecular pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP evidence for direct binding plus KO phenotype data, single lab\",\n      \"pmids\": [\"26321246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"HOXC13 and SPI1 (PU.1) synergistically and dose-dependently activate transcription of the proto-oncogene Zfp521 through specific regions of the Zfp521 promoter; this regulatory relationship is supported in vivo in transgenic mice overexpressing Hoxc13 in fetal liver, where Zfp521 expression correlates with Hoxc13 levels.\",\n      \"method\": \"Co-transfection reporter assay, promoter deletion analysis, transgenic mouse expression correlation\",\n      \"journal\": \"Genesis (New York, N.Y. : 2000)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-transfection reporter assay with in vivo correlation, single lab, two methods\",\n      \"pmids\": [\"27506447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HOXC13 directly represses transcription of CASP3 by binding to the CASP3 promoter region (ChIP); HOXC13 knockdown upregulates CASP3 and induces apoptosis in ESCC cells; miR-503 directly targets the HOXC13 3'UTR to downregulate HOXC13.\",\n      \"method\": \"ChIP assay, knockdown experiments, luciferase reporter (miR-503 targeting), apoptosis assays\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct binding at CASP3 promoter with functional apoptosis readout, single lab\",\n      \"pmids\": [\"29168599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HOXC13 knockdown induces G1-phase arrest in lung adenocarcinoma cells by downregulating CCND1 and CCNE1; conversely, HOXC13 overexpression promotes G1-to-S transition by upregulating CCND1 and CCNE1; miR-141 directly targets the HOXC13 3'UTR to suppress its expression.\",\n      \"method\": \"siRNA knockdown, overexpression, cell cycle analysis (flow cytometry), luciferase 3'UTR reporter assay\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE with defined cell cycle readout and identified downstream effectors (CCND1/CCNE1), single lab\",\n      \"pmids\": [\"28979806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HOXC13 regulates keratin gene expression differentially: in cashmere goat dermal papilla cells, HOXC13 upregulates promoter activity of KRT84 and KRT38 but downregulates promoter activity of KRT1 and KRT2; two SNPs in the HOXC13 homeodomain (c.812A>G and c.929A>C) abolish its regulatory function on keratins without altering protein expression; HOXC13 negatively auto-regulates its own promoter; LEF1 positively regulates HOXC13 promoter activity.\",\n      \"method\": \"Dual-luciferase reporter assay in HEK293T and dermal papilla cells, promoter-GFP overexpression system, site-directed mutagenesis (SNP analysis)\",\n      \"journal\": \"BMC genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — luciferase reporter with mutagenesis in two cell types, single lab, multiple readouts\",\n      \"pmids\": [\"30139327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BMI-1 knockdown (via shRNA) in HeLa cells leads to significant upregulation of HOXC13 mRNA, indicating that BMI-1 (Polycomb group) transcriptionally represses HOXC13 expression.\",\n      \"method\": \"shRNA-mediated knockdown of BMI-1, RT-PCR for HOXC13 mRNA\",\n      \"journal\": \"Medical oncology (Northwood, London, England)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (mRNA measurement post-KD), single lab, indirect evidence of repression\",\n      \"pmids\": [\"20661663\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In a mouse model of cerebral ischemia/reperfusion, LOC102640519 positively regulates HOXC13 expression (confirmed by ChIP assay showing LOC102640519's regulation of HOXC13), and elevated HOXC13 in turn negatively regulates ZO-1, Occludin, and Claudin-5 expression (confirmed by luciferase reporter and RNA pulldown), contributing to blood-brain-barrier disruption.\",\n      \"method\": \"ChIP assay, luciferase reporter assay, RNA pulldown, FISH, Western blot in MCAO mouse model and OGD/R cell model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ChIP and reporter assays in a specific disease context, complex lncRNA/protein mechanism, single lab\",\n      \"pmids\": [\"29842876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Silencing HOXC13 in prostate cancer cells (22RV1 and DU145) induces DNA damage and activates the cGAS/STING/IRF3 pathway, upregulating IFN-β, CCL2, CCL5, and CXCL10 transcription; high HOXC13 expression suppresses γδ T cell and plasma cell infiltration and recruits M2 macrophages.\",\n      \"method\": \"siRNA knockdown, DNA damage assays, cGAS/STING pathway activation markers, immune infiltration analysis (CIBERSORT), qRT-PCR for immune factors\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined molecular pathway activation (cGAS/STING/IRF3) and multiple downstream readouts, single lab\",\n      \"pmids\": [\"38057852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HOXC13 directly binds the TIMM13 promoter and drives its transcription in osteosarcoma cells; HOXC13 silencing reduces TIMM13 expression, causing mitochondrial dysfunction (depolarization, ROS, ATP depletion, lipid peroxidation) and inhibiting Akt-mTOR signaling, proliferation, and migration.\",\n      \"method\": \"ChIP, HOXC13 silencing with TIMM13 expression readout, TIMM13 KO xenograft model, mitochondrial function assays, Akt-mTOR pathway markers\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP for direct binding plus functional KO phenotype with defined downstream pathway, single lab\",\n      \"pmids\": [\"37407582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HOXC13 positively regulates DNMT3A transcription in breast cancer cells (predicted by JASPAR database and confirmed by functional assays); HOXC13 knockdown reduces proliferation, migration, invasion, EMT, and glycolysis in BC cells.\",\n      \"method\": \"JASPAR binding site prediction, cell transfection (knockdown/OE), CCK-8, flow cytometry, Transwell, XF96 extracellular flux analyzer\",\n      \"journal\": \"Experimental and therapeutic medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — binding site is computational prediction; functional link to DNMT3A is inferred from co-expression changes, not confirmed by direct binding assay; single lab\",\n      \"pmids\": [\"37614427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ChIP-Seq in rabbit dermal papilla cells overexpressing HOXC13 identifies 9,670 genomic binding peaks; HOXC13 binds the PRKACB promoter region (−1596 to −1107 bp) and inhibits PRKACB transcription (confirmed by dual-luciferase reporter assay); PRKACB overexpression modulates BCL2, WNT2, LEF1, and SFRP2, inhibits DPC proliferation, and promotes apoptosis.\",\n      \"method\": \"ChIP-Seq, dual-luciferase reporter assay, RT-qPCR, CCK-8, flow cytometry\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — ChIP-Seq genome-wide binding with targeted luciferase validation at PRKACB promoter, single lab\",\n      \"pmids\": [\"38381512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HOXC13 is required for the stable maintenance of HPV16, HPV52, and HPV58 genomes in keratinocytes; CRISPR-Cas9 knockout of HOXC13 causes progressive loss of these viral genome copy numbers over passages, whereas HPV18 genome stability is HOXC13-independent.\",\n      \"method\": \"CRISPR-Cas9 KO of HOXC13 in NIKS cells, transfection of HPV genomes, quantitative copy number monitoring over cell passages\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean CRISPR KO with quantitative viral genome readout across multiple HPV genotypes, single lab\",\n      \"pmids\": [\"38914027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Hoxc13 is required for the expression of hair keratin homologs in the cornified claws of Xenopus frogs; hoxc13 deletion abolishes hair keratin homolog expression and abrogates cornified claw development; Hoxc13 binding sites are conserved in the promoters of these keratin genes across amphibians and mammals, indicating an ancestral evolutionary role.\",\n      \"method\": \"CRISPR/Cas9 knockout of hoxc13 in X. tropicalis, gene expression analysis, promoter binding site conservation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo KO with defined molecular and morphological phenotype, promoter binding site conservation, ortholog confirmed across species\",\n      \"pmids\": [\"38499530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A missense variant p.Arg311Trp in the homeobox domain of HOXC13 causes PHNED by decreasing HOXC13 protein stability (rather than altering DNA-binding affinity), as revealed by in vitro overexpression assays and computational structural modeling showing loss of interhelical connection between Arg311 (α-helix 3) and Glu276 (α-helix 1).\",\n      \"method\": \"In vitro overexpression assay (protein stability), in silico structural prediction, comparison with previously reported variants\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — in vitro overexpression with in silico modeling, no in vitro reconstitution or mutagenesis rescue experiment; single lab\",\n      \"pmids\": [\"40225922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Hoxc13-null mice, expression of Foxn1, Krt85, and Krt35 is decreased, confirming these genes as downstream targets of HOXC13 in hair follicle differentiation; Hoxc13-null pigs show similar reductions in Foxn1, Krt85, and Krt35 expression, with absent normal hair and reduced/disarrayed follicles.\",\n      \"method\": \"CRISPR/Cas9 knockout pig generation, RT-PCR for target gene expression, histological analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — independent KO in large animal model confirms target gene regulation, multiple downstream targets validated\",\n      \"pmids\": [\"28011715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RHOXF2 physically interacts with HOXC13 (confirmed by co-immunoprecipitation and GST pulldown); RHOXF2 knockdown suppresses HOXC13 expression; HOXC13 overexpression rescues the effects of RHOXF2 knockdown on TNBC cell proliferation, invasion, and Wnt2/β-catenin pathway activity.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, overexpression/knockdown with rescue experiment, Wnt pathway markers\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal protein interaction (Co-IP + GST pulldown) with functional rescue experiment, single lab\",\n      \"pmids\": [\"38697448\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HOXC13 is a homeodomain transcription factor that binds specific DNA sequences in promoters of hair keratin (KRT) and keratin-associated protein (KAP) genes to regulate their expression (activating some, repressing others), directly activates downstream transcription factors FOXN1 and FOXQ1 to coordinate hair follicle differentiation, negatively auto-regulates its own expression, is recruited to DNA replication origins via its homeodomain, is transcriptionally activated by estrogen through ERα/ERβ and MLL histone methyltransferases, physically interacts with PU.1/SPI1 to modulate hematopoietic gene expression, regulates the hair cycle by suppressing TGF-β1/Smad2 signaling, and loss-of-function mutations in its homeodomain cause pure hair and nail ectodermal dysplasia by reducing DNA-binding activity, inducing protein mislocalization, or decreasing protein stability.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HOXC13 is a homeodomain transcription factor that serves as a master regulator of hair, nail, and filiform papilla development, with knockout animals from mice to pigs to frogs all displaying alopecia, brittle hair, and defective cornified appendages [#0, #29, #27]. It executes this program by binding sequence-specific cognate sites in the promoters of hair structural genes, directly activating some keratin-associated protein (KAP) and keratin genes while repressing others, and by negatively autoregulating its own promoter [#2, #19, #1]. HOXC13 sits atop a follicle differentiation cascade, directly activating the forkhead transcription factors FOXQ1 and FOXN1 through ChIP- and reporter-validated binding to coordinate medulla and terminal keratinocyte differentiation [#5, #9]. Additional medulla-specific targets including Crisp1 and Soat1 are directly bound and regulated by HOXC13 [#3, #15], and its control of the hair cycle involves suppression of TGF-\\u03b21/p-Smad2 signaling to delay the anagen-to-catagen transition [#14]. Beyond its developmental role, HOXC13 associates with DNA replication complexes, co-localizing with early-S-phase replication foci and binding defined origins via its homeodomain [#7], and physically interacts with the ETS factor PU.1/SPI1 to modulate hematopoietic gene expression [#6, #16]. Its own expression is induced by estrogen via ER\\u03b1/ER\\u03b2 and MLL histone methyltransferases [#8] and is constrained by upstream regulators including YAP/TEAD and Polycomb BMI-1 [#13]. Loss-of-function HOXC13 mutations\\u2014nonsense, frameshift, and homeodomain variants\\u2014cause autosomal-recessive pure hair and nail ectodermal dysplasia, acting through nonsense-mediated decay, cytoplasmic mislocalization, or loss of DNA-binding and target activation [#10, #12]. In multiple cancers HOXC13 is co-opted as a pro-proliferative factor controlling cell-cycle and apoptotic targets [#11, #18, #17].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that HOXC13 is genetically essential for the development of hair, nails, and filiform papillae, defining its core biological role.\",\n      \"evidence\": \"Gene-targeted knockout mouse with phenotypic analysis\",\n      \"pmids\": [\"9420327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify direct transcriptional targets\", \"No molecular mechanism for differentiation control\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Linked HOXC13 dosage to hair keratin-associated protein gene expression and revealed negative autoregulation, showing it acts as a tunable transcriptional regulator of structural genes.\",\n      \"evidence\": \"Transgenic overexpression with DNA chip expression profiling and lacZ reporter\",\n      \"pmids\": [\"11290294\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect regulation of KAP genes not distinguished\", \"Mechanism of autoregulation not mapped\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that HOXC13 binds KAP gene promoters directly and sequence-specifically, converting correlative expression data into a direct regulatory relationship.\",\n      \"evidence\": \"EMSA on Krtap16 promoter sites\",\n      \"pmids\": [\"15385554\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro binding only\", \"Activation vs repression output at native loci unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed HOXC13 upstream of FOXQ1 in a medulla differentiation pathway, establishing it as an apical regulator of a downstream transcription factor cascade.\",\n      \"evidence\": \"Gene array, co-transfection reporter, ChIP, DNA binding\",\n      \"pmids\": [\"16835220\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cofactors mediating activation not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed HOXC13 functions without TALE cofactors MEIS/PREP in the follicle compartments where it activates early hair keratins, ruling out a canonical HOX cofactor requirement here.\",\n      \"evidence\": \"RT-PCR and immunolocalization of TALE proteins and HOXC13 in hair follicle\",\n      \"pmids\": [\"16292560\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Alternative cofactors not identified\", \"Negative localization finding only\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed a non-transcriptional role: HOXC13 associates with DNA replication complexes and origins through its homeodomain in a cell-cycle-dependent manner.\",\n      \"evidence\": \"Fluorescent fusion live imaging and ChIP at defined replication origins\",\n      \"pmids\": [\"19182517\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence for replication not demonstrated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified estrogen/ER and MLL methyltransferases as upstream activators of HOXC13 transcription, embedding it in hormonal and chromatin-modifying control.\",\n      \"evidence\": \"ChIP, siRNA of ER\\u03b1/ER\\u03b2/MLL1-4, promoter reporters\",\n      \"pmids\": [\"19922474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological context of estrogen regulation unclear\", \"Tissue specificity not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended the regulatory cascade by showing HOXC13 directly activates FOXN1, connecting it to terminal keratinocyte differentiation programs.\",\n      \"evidence\": \"Microarray, co-transfection, ChIP, and Hoxc13/Foxn1 null mouse comparison\",\n      \"pmids\": [\"21191399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of FOXN1-dependent effectors not mapped\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established HOXC13 as the causative gene for autosomal-recessive pure hair and nail ectodermal dysplasia, validating its essential human function.\",\n      \"evidence\": \"Whole-exome sequencing, RT-PCR, immunostaining in two families\",\n      \"pmids\": [\"23063621\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype correlation across mutation types not yet defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed a frameshift mutation causes cytoplasmic mislocalization and loss of target activation, establishing that nuclear localization is required for HOXC13 function.\",\n      \"evidence\": \"Sequencing plus localization and promoter reporter assays of mutant vs wild-type\",\n      \"pmids\": [\"23315978\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NLS not precisely mapped\", \"Single lab in vitro assay\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapped a direct physical interaction between HOXC13 and PU.1/SPI1 with functional consequences for erythroid differentiation, revealing a hematopoietic role distinct from hair biology.\",\n      \"evidence\": \"Reciprocal interaction mapping, reporter assays, enforced expression in MEL cells\",\n      \"pmids\": [\"18076876\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo hematopoietic relevance limited\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed HOXC13 and SPI1 synergistically activate the proto-oncogene Zfp521, reinforcing the hematopoietic partnership with a defined transcriptional target.\",\n      \"evidence\": \"Co-transfection reporter, promoter deletion, transgenic mouse correlation\",\n      \"pmids\": [\"27506447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding at Zfp521 promoter by HOXC13 vs SPI1 not separated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified additional direct hair-medulla targets (Soat1) and an upstream YAP/TEAD axis controlling HOXC13 in epithelial progenitor proliferation, broadening its tissue regulatory network.\",\n      \"evidence\": \"ChIP and IHC for Soat1; RNA-Seq, ChIP, sphere assay in Yap mutant mice\",\n      \"pmids\": [\"26321246\", \"25691658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional epistasis of YAP\\u2192HOXC13 not fully resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated HOXC13 controls hair-cycle timing by suppressing TGF-\\u03b21/p-Smad2 signaling to delay catagen entry, adding a signaling-modulation function.\",\n      \"evidence\": \"shRNA knockdown, recombinant polypeptide injection, p-Smad2 immunostaining in vivo\",\n      \"pmids\": [\"26553656\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect effect on TGF-\\u03b21 pathway not established\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved that HOXC13 differentially activates and represses distinct keratin promoters and is positively regulated by LEF1, while homeodomain SNPs abolish regulatory function without changing protein levels.\",\n      \"evidence\": \"Dual-luciferase reporters in two cell types, promoter-GFP system, site-directed mutagenesis\",\n      \"pmids\": [\"30139327\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of bidirectional output at different promoters unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Confirmed conserved downstream targets (Foxn1, Krt85, Krt35) in an independent large-animal knockout, strengthening the cross-species HOXC13 follicle program.\",\n      \"evidence\": \"CRISPR/Cas9 knockout pig, RT-PCR, histology\",\n      \"pmids\": [\"28011715\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No new mechanism beyond target confirmation\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Implicated HOXC13 as a pro-survival, pro-proliferative factor in cancer through direct repression of CASP3 and control of cyclins, regulated by miR-503 and miR-141.\",\n      \"evidence\": \"ChIP, knockdown/overexpression, apoptosis and cell-cycle assays, 3'UTR luciferase\",\n      \"pmids\": [\"29168599\", \"28979806\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether oncogenic role uses the same DNA-binding logic as developmental targets unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established the ancestral evolutionary depth of HOXC13's keratin-regulatory role by showing it controls hair keratin homolog expression and cornified claw formation in frogs with conserved binding sites.\",\n      \"evidence\": \"CRISPR/Cas9 knockout in X. tropicalis, expression analysis, promoter conservation\",\n      \"pmids\": [\"38499530\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conservation of the full downstream cascade across taxa not tested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Expanded HOXC13's roles to viral genome maintenance and tumor-immune modulation, and added genome-wide binding data plus new physical partner RHOXF2.\",\n      \"evidence\": \"CRISPR KO with HPV copy-number tracking; cGAS/STING immune profiling; ChIP-Seq; Co-IP/GST pulldown with rescue\",\n      \"pmids\": [\"38914027\", \"38057852\", \"38381512\", \"38697448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which HOXC13 supports HPV genome maintenance unknown\", \"Direct binding underlying immune effects not mapped\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HOXC13 selects between transcriptional activation and repression at different target promoters, and what cofactors substitute for canonical TALE proteins in follicle compartments, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of HOXC13 bound to native target promoters\", \"Activation/repression cofactor identity unknown\", \"Connection between developmental and oncogenic target repertoires unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 5, 9, 19, 25]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 3, 5, 7, 25]},\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [5, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [4, 7, 12]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 5, 9, 19]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 5, 9, 27]},\n      {\"term_id\": \"R-HSA-69306\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [11, 18]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SPI1\", \"RHOXF2\", \"ESR1\", \"ESR2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}