Homeobox protein cut-like 2 · UniProt O14529
CUX2 is a Cut-repeat/homeodomain transcription factor that governs the genesis, differentiation, and functional maturation of upper-layer cortical neurons while also operating in other tissues as a sequence-specific DNA-binding regulator (PMID:8798433, PMID:18033766). Through three Cut repeats and a homeodomain it binds DNA in a sequence-specific but rapid and transient manner, functioning predominantly as a transcriptional repressor though it activates targets in specific contexts (PMID:8798433, PMID:15656993). In the developing nervous system CUX2 acts cell-autonomously to drive cell-cycle exit of intermediate neuronal precursors—binding the Neurod and p27(Kip1) promoters—and to control neuroblast formation and cell-fate determination, downstream of Notch signaling (PMID:18033766, PMID:18223201, PMID:19542352). In post-mitotic layer II–III neurons it intrinsically controls dendrite branching, spine development, and synapse formation, in part by directly regulating the chromatin-remodeling genes Xlr3b and Xlr4b, and it physically interacts with the CUX1-derived CASP isoform to modulate excitatory synaptic transmission (PMID:20510857, PMID:35581205). Beyond transcription, CUX2 Cut repeats directly stimulate the base-excision-repair glycosylase OGG1 on oxidized DNA, and CUX2 is required—alongside ATF4-driven double-strand-break repair programs—for the resilience of layer 2/3 excitatory neurons against oxidative and inflammatory DNA damage (PMID:26221032, PMID:41922773, PMID:41922774). In liver, CUX2 enforces sex-biased gene expression by activating female-biased genes and repressing male-biased genes, the latter through competitive displacement of HNF6 from co-occupied binding sites (PMID:22966202, PMID:26218442). Cux2 expression is itself controlled by the upstream activators Lmx1a and Lhx2 acting through conserved enhancer elements (PMID:30770393, PMID:31708105).
Established that CUX2 is a sequence-specific DNA-binding protein, defining its molecular identity as a Cut-repeat/homeodomain factor.
Evidence GST fusion protein DNA-binding assay on NCAM promoter oligonucleotides
Distinguished CUX2 from its paralog CUX1 biochemically, showing CUX2 makes more rapid/transient DNA contacts and acts exclusively as a repressor in this cellular context.
Evidence In vitro DNA binding with purified Cut-repeat fusions plus cell-based reporter assays in NIH3T3
Defined CUX2's cell-autonomous role in cortical neurogenesis—controlling cell-cycle exit of intermediate precursors independently of CUX1.
Evidence Cux2-/- mice, overexpression, BrdU cell-cycle assays, Cux1/Cux2 double-mutant epistasis
Linked CUX2's proliferation control to direct transcriptional targets and extended its role to spinal neurogenesis.
Evidence ChIP on Neurod and p27(Kip1) promoters with reciprocal gain/loss-of-function mouse mutants
Placed Cux2 downstream of Notch signaling in dorsal interneuron formation, embedding it in a developmental signaling cascade.
Evidence Loss-of-function mouse studies with Notch pathway manipulation and genetic epistasis
Showed CUX2 acts in post-mitotic neurons to build dendrites, spines, and synapses via direct regulation of chromatin-remodeling genes, connecting it to circuit function and behavior.
Evidence KO/KD, morphology, electrophysiology, target analysis (Xlr3b/Xlr4b), behavioral testing
Identified CUX2 as a sex-specific transcriptional regulator in liver, revealing a repression mechanism via competition at male-biased regulatory regions.
Evidence Adenoviral overexpression, siRNA knockdown, ChIP-seq cistrome mapping
Resolved paralog division of labor in dendrite development, assigning apical compartment control to CUX2 and basal to CUX1.
Evidence In vivo reciprocal loss/gain-of-function with apical vs. basal dendrite morphometry
Revealed a non-transcriptional function: CUX2 Cut repeats directly stimulate OGG1-mediated base-excision repair of oxidized DNA, protecting neurons from oxidative damage.
Evidence In vitro OGG1 enzymatic assays with purified CUX2 fragments plus cellular KD and ectopic expression with DNA damage quantification
Mechanistically demonstrated competitive DNA-binding displacement of HNF6 by CUX2 as the basis for repressing male-biased liver genes.
Evidence Cell-based transfection, in vitro EMSA, and HNF6/CUX2 ChIP-seq cistrome comparison
Identified the upstream activators that drive region- and layer-specific Cux2 expression, defining how the factor is positioned developmentally.
Evidence In vivo and in vitro enhancer reporter assays with site-directed mutation of Lmx1a and Lhx2 binding sites
Extended CUX2 as a direct transcriptional activator of Raldh2 and Hoxb genes patterning the forelimb field, demonstrating context-dependent activator function outside the nervous system.
Evidence siRNA knockdown and gain-of-function (including CUX2-VP16) in chick with positional phenotyping
Expanded CUX2's transcriptional repertoire to ADCY1 and KDM5B in cancer contexts and established a physical interaction with the CASP isoform regulating excitatory transmission.
Evidence ChIP, dual-luciferase, gain/loss-of-function and xenografts (ADCY1, KDM5B); Co-IP, conditional KO, electrophysiology (CASP)
PMID:35581205 PMID:35881915 PMID:36242624
Integrated CUX2's repair and identity functions, showing CUX2+ layer 2/3 neurons depend on CUX2- and ATF4-driven DNA repair to survive oxidative/inflammatory damage.
Evidence Demyelination/inflammation mouse models, conditional Atf4 knockout, interferon-γ ROS/DNA damage assays, ATM phosphorylation analysis
| Year | Finding | Method | Journal | Conf | PMIDs |
|---|---|---|---|---|---|
| 1996 | CUX2 protein contains three Cut repeat domains and one homeodomain; a GST fusion protein containing the C-terminal Cut repeat and homeodomain of CUX2 binds DNA in a sequence-specific manner to oligonucleotides derived from the NCAM gene promoter. | In vitro DNA binding assay using GST fusion protein | The Journal of biological chemistry | Medium | 8798433 |
| 2004 | Biochemical characterization showed that CUX2 Cut repeat domains (CR1CR2, CR2CR3HD, CR3HD) have similar DNA-binding specificity to corresponding CUX1 domains but make more rapid and transient interactions with DNA. CUX2 functions exclusively as a transcriptional repressor in NIH3T3 cells (unlike CUX1 which can activate or repress), and no N-terminally processed p110-equivalent isoform was detected. | In vitro DNA binding assays with purified fusion proteins; cell-based transcriptional reporter assays | Gene | Medium | 15656993 |
| 2007 | CUX2 controls cell cycle exit of intermediate neuronal precursors in the cortical SVZ in a cell-autonomous manner; Cux2-/- mice show excessive SVZ neuronal precursor expansion and increased upper layer neuron number, while this function is independent of CUX1 (demonstrated by Cux1-/-;Cux2-/- double mutant analysis). | Genetic knockout (Cux2-/- mice), overexpression studies, BrdU cell-cycle re-entry assays, double mutant epistasis | Cerebral cortex | High | 18033766 |
| 2008 | CUX2 directly binds the Neurod and p27(Kip1) promoters in vivo, and regulates cell-cycle progression of neural progenitors as well as neuroblast formation and cell-fate determination in the spinal cord. Loss-of-function causes smaller spinal cords with reduced Neurod and p27(Kip1) activity; gain-of-function enlarges spinal cord with enhanced neuroblast formation. | Chromatin immunoprecipitation (ChIP), loss-of-function mouse mutants, gain-of-function transgenic mice | Development | High | 18223201 |
| 2008 | CUX1 and CUX2 together are required for specification of Reelin-expressing cortical interneurons; Cux1-/-;Cux2-/- double mutant mice completely lack Reelin expression in cortical layers II-IV, while single mutants are unaffected, demonstrating essential but redundant roles. | Genetic double knockout mice, immunohistochemistry for Reelin | Developmental neurobiology | Medium | 18327765 |
| 2009 | Notch signaling regulates Cux2 expression in the spinal cord, and Cux2 acts downstream of Notch signaling to regulate dorsal interneuron formation; loss-of-function of Cux2 reduces dorsal spinal cord interneuron numbers. | Loss-of-function mouse studies, Notch pathway manipulation, genetic epistasis | Development | Medium | 19542352 |
| 2010 | CUX2 is an intrinsic regulator of dendrite branching, dendritic spine development, and synapse formation in cortical layer II-III neurons; Cux2-/- mice show abnormal dendrites and synapses correlating with reduced synaptic function and working memory defects. CUX2 directly regulates expression of chromatin remodeling genes Xlr3b and Xlr4b as part of this mechanism. | Knockout and knockdown studies, morphological analysis, electrophysiology, molecular analysis of downstream targets, behavioral testing | Neuron | High | 20510857 |
| 2012 | CUX2 functions as a sex-specific transcriptional regulator in female liver, activating female-biased genes (including A1bg, Cyp2b9, Cyp3a44, Tox, Trim24 by direct binding) and repressing male-biased genes. CUX2 chromatin binding is enriched at regions with male-biased DNase hypersensitivity and male-enriched STAT5 binding sites, suggesting competitive displacement as a repression mechanism. | Adenoviral overexpression, siRNA knockdown, ChIP-seq, chromatin binding analysis | Molecular and cellular biology | High | 22966202 |
| 2014 | CUX2 specifically regulates apical dendrite development in cortical layer II-III neurons, while CUX1 preferentially regulates basal dendrite development; demonstrated by in vivo loss- and gain-of-function analysis showing distinct compartment-specific effects of each paralog. | In vivo loss-of-function and gain-of-function analysis, morphological analysis of apical vs. basal dendrites | Developmental neurobiology | Medium | 25059644 |
| 2015 | CUX2 Cut repeat domains stimulate OGG1 (8-oxoguanine DNA glycosylase 1) by increasing OGG1 binding to 8-oxoguanine-containing DNA and stimulating both its glycosylase and AP lyase activities in vitro; CUX2 knockdown in neurons increases oxidative DNA damage, while ectopic expression of CUX2 Cut repeats accelerates DNA repair and reduces oxidative DNA damage. | In vitro biochemical assay of OGG1 activity with purified CUX2 fragments, siRNA knockdown, ectopic expression, DNA damage quantification | The Journal of biological chemistry | High | 26221032 |
| 2015 | CUX2 inhibits HNF6 transcriptional regulation of sex-specific gene promoters (CYP2C11 and CYP2C12) through competition for DNA binding, as demonstrated by EMSA; approximately 90% of CUX2 genome-wide binding sites are co-bound by HNF6, with CUX2 displacement of HNF6 proposed as a mechanism for repression of male-biased genes. | Cell-based transfection assays, in vitro EMSA, ChIP-seq (HNF6 and CUX2 cistromes) | Molecular endocrinology | High | 26218442 |
| 2019 | Lmx1a transcription factor directly activates Cux2 expression through binding to a conserved intronic enhancer in the cortical hem; Lmx1a-binding sites within the enhancer are required for activity in vivo, and mis-expression of Lmx1a in hippocampal progenitors increases Cux2 enhancer activity outside the cortical hem. | In vitro reporter assays, in vivo enhancer reporter assays, bioinformatic identification of TF binding sites, mis-expression experiments | Development | Medium | 30770393 |
| 2019 | CUX2 directly activates expression of Raldh2 and Hoxb genes in the lateral plate mesoderm to refine the forelimb field position along the anterior-posterior axis; knockdown causes caudal shift of forelimb bud, while overexpression or constitutively active CUX2-VP16 causes rostral shift. | siRNA knockdown in chick, gain-of-function with CUX2 and CUX2-VP16, functional analysis of downstream targets | Biology open | Medium | 30651234 |
| 2019 | Lhx2 transcription factor acts as a transcriptional activator of Cux2 through a conserved 220 bp enhancer region (Cux2-E1) that controls cortical layer II-IV-specific expression; demonstrated by in vivo reporter assays and identification of the minimal enhancer. | BAC transgenic mice, comparative genome analysis, in vivo reporter assays, immunohistochemistry | Biochemical and biophysical research communications | Medium | 31708105 |
| 2022 | CUX2 protein physically interacts with CASP (a short CUX1 isoform), as shown by co-immunoprecipitation; both are co-expressed in excitatory neurons of the entorhinal cortex. CUX2 knockout mice show increased excitatory cell numbers in entorhinal cortex and enhanced glutamatergic synaptic transmission to hippocampus, and CUX2 missense variants show abnormal localization in human cell culture. | Co-immunoprecipitation, conditional knockout mice, electrophysiology, cell localization analysis | Scientific reports | Medium | 35581205 |
| 2022 | CUX2 directly binds the ADCY1 promoter to activate its transcription, as shown by ChIP and dual-luciferase reporter assays; CUX2 overexpression suppresses glioma cell proliferation, migration, and invasion in a manner dependent on ADCY1 upregulation. | ChIP assay, dual-luciferase reporter assay, gain- and loss-of-function experiments, xenograft mouse model | Experimental brain research | Medium | 36242624 |
| 2022 | CUX2 directly activates KDM5B transcription; KDM5B in turn represses SOX17 through histone demethylation, establishing a CUX2/KDM5B/SOX17 regulatory axis in breast cancer cells. ChIP and dual-luciferase reporter assays confirmed CUX2 binding to the KDM5B promoter. | ChIP assay, dual-luciferase reporter assay, gain- and loss-of-function, Western blotting, in vivo xenograft | Endocrinology | Medium | 35881915 |
| 2026 | CUX2 function is required for resilience of cortical L2/3 excitatory neurons during neuroinflammation; Cux2 and Atf4 act in neurons to enhance DNA double-strand break repair. Interferon-γ elevates reactive oxygen species causing DNA damage and selective depletion of CUX2+ L2/3 neurons in mice. | Mouse models of demyelination/inflammation, loss-of-function studies, in vitro interferon-γ treatment, DNA damage assays | Nature | High | 41922773 |
| 2026 | ATF4, whose transcriptional targets include DNA repair components CIRBP, UBA52, and EBF1, is specifically required for development of CUX2+ upper cortical layer 2/3 neurons; pan-cortical ATF4 knockout (Emx1-Cre;Atf4fl/fl) selectively eliminates CUX2+ neurons, and CIRBP is required for normal phosphorylation of ATM during DNA damage responses. | Conditional knockout mice (Emx1-Cre;Atf4fl/fl), transcriptional target identification, ATM phosphorylation assays | Nature | High | 41922774 |
| Year | Title | Journal | Citations | PMID |
|---|---|---|---|---|
| 2004 | Expression of Cux-1 and Cux-2 in the subventricular zone and upper layers II-IV of the cerebral cortex. | The Journal of comparative neurology | 417 | 15452856 |
| 2010 | Cux1 and Cux2 regulate dendritic branching, spine morphology, and synapses of the upper layer neurons of the cortex. | Neuron | 247 | 20510857 |
| 2004 | Dynamics of Cux2 expression suggests that an early pool of SVZ precursors is fated to become upper cortical layer neurons. | Cerebral cortex (New York, N.Y. : 1991) | 190 | 15238450 |
| 2007 | Cux-2 controls the proliferation of neuronal intermediate precursors of the cortical subventricular zone. | Cerebral cortex (New York, N.Y. : 1991) | 96 | 18033766 |
| 2015 | Lineage Tracing Using Cux2-Cre and Cux2-CreERT2 Mice. | Neuron | 71 | 25996136 |
| 1996 | Primary structure, neural-specific expression, and chromosomal localization of Cux-2, a second murine homeobox gene related to Drosophila cut. | The Journal of biological chemistry | 69 | 8798433 |
| 2012 | Impact of CUX2 on the female mouse liver transcriptome: activation of female-biased genes and repression of male-biased genes. | Molecular and cellular biology | 64 | 22966202 |
| 2008 | Cux2 (Cutl2) integrates neural progenitor development with cell-cycle progression during spinal cord neurogenesis. | Development (Cambridge, England) | 58 | 18223201 |
| 2014 | Cux1 and Cux2 selectively target basal and apical dendritic compartments of layer II-III cortical neurons. | Developmental neurobiology | 51 | 25059644 |
| 2015 | CUX2 protein functions as an accessory factor in the repair of oxidative DNA damage. | The Journal of biological chemistry | 47 | 26221032 |
| 2008 | Cux-1 and Cux-2 control the development of Reelin expressing cortical interneurons. | Developmental neurobiology | 45 | 18327765 |
| 2006 | Expression of Cux-1 and Cux-2 in the developing somatosensory cortex of normal and barrel-defective mice. | The anatomical record. Part A, Discoveries in molecular, cellular, and evolutionary biology | 44 | 16419078 |
| 2011 | The transcription factor Cux2 marks development of an A-delta sublineage of TrkA sensory neurons. | Developmental biology | 39 | 21945863 |
| 2004 | Biochemical characterization of the mammalian Cux2 protein. | Gene | 37 | 15656993 |
| 2003 | Dynamic expression of murine Cux2 in craniofacial, limb, urogenital and neuronal primordia. | Gene expression patterns : GEP | 35 | 12971989 |
| 2015 | Cross Talk Between GH-Regulated Transcription Factors HNF6 and CUX2 in Adult Mouse Liver. | Molecular endocrinology (Baltimore, Md.) | 34 | 26218442 |
| 2003 | CDP-2,3-Di-O-geranylgeranyl-sn-glycerol:L-serine O-archaetidyltransferase (archaetidylserine synthase) in the methanogenic archaeon Methanothermobacter thermautotrophicus. | Journal of bacteriology | 32 | 12562787 |
| 2018 | The epilepsy phenotypic spectrum associated with a recurrent CUX2 variant. | Annals of neurology | 23 | 29630738 |
| 2005 | Linkage disequilibrium mapping of bipolar affective disorder at 12q23-q24 provides evidence for association at CUX2 and FLJ32356. | American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics | 22 | 15389760 |
| 2014 | Cux2 acts as a critical regulator for neurogenesis in the olfactory epithelium of vertebrates. | Developmental biology | 21 | 24512687 |
| 2018 | A recurrent de novo CUX2 missense variant associated with intellectual disability, seizures, and autism spectrum disorder. | European journal of human genetics : EJHG | 20 | 29795476 |
| 2009 | Cux2 functions downstream of Notch signaling to regulate dorsal interneuron formation in the spinal cord. | Development (Cambridge, England) | 20 | 19542352 |
| 2014 | Cux2 activity defines a subpopulation of perinatal neurogenic progenitors in the hippocampus. | Hippocampus | 19 | 25252086 |
| 2021 | Adult Upper Cortical Layer Specific Transcription Factor CUX2 Is Expressed in Transient Subplate and Marginal Zone Neurons of the Developing Human Brain. | Cells | 13 | 33671178 |
| 2022 | CUX2 deficiency causes facilitation of excitatory synaptic transmission onto hippocampus and increased seizure susceptibility to kainate. | Scientific reports | 12 | 35581205 |
| 2020 | CUX2, BRAP and ALDH2 are associated with metabolic traits in people with excessive alcohol consumption. | Scientific reports | 11 | 33093602 |
| 2019 | Cux2 expression regulated by Lhx2 in the upper layer neurons of the developing cortex. | Biochemical and biophysical research communications | 11 | 31708105 |
| 2001 | CUX2, a potential regulator of NCAM expression: genomic characterization and analysis as a positional candidate susceptibility gene for bipolar disorder. | American journal of medical genetics | 11 | 11353453 |
| 2019 | Lmx1a drives Cux2 expression in the cortical hem through activation of a conserved intronic enhancer. | Development (Cambridge, England) | 9 | 30770393 |
| 2018 | CUX2 functions as an oncogene in papillary thyroid cancer. | OncoTargets and therapy | 9 | 30636884 |
| 2022 | CUX2/KDM5B/SOX17 Axis Affects the Occurrence and Development of Breast Cancer. | Endocrinology | 7 | 35881915 |
| 2019 | Cux2 refines the forelimb field by controlling expression of Raldh2 and Hox genes. | Biology open | 7 | 30651234 |
| 2016 | Cux2 serves as a novel lineage marker of granule cell layer neurons from the rhombic lip in mouse and chick embryos. | Developmental dynamics : an official publication of the American Association of Anatomists | 7 | 27198720 |
| 2022 | Novel Variant Expands the Clinical Spectrum of CUX2-Associated Developmental and Epileptic Encephalopathies. | Frontiers in genetics | 5 | 35846140 |
| 2019 | Association of FAM65B, AGBL4, and CUX2 genetic polymorphisms with susceptibility to antituberculosis drug-induced hepatotoxicity: validation study in a Chinese Han population. | Pharmacogenetics and genomics | 5 | 30720667 |
| 2023 | Androgen-Dependent Expression of CUX2 mRNA in the Pig Liver Is Associated with That of Drug Metabolizing Enzymes and Drug Transporters. | Biological & pharmaceutical bulletin | 4 | 36858577 |
| 2022 | CUX2 prevents the malignant progression of gliomas by enhancing ADCY1 transcription. | Experimental brain research | 2 | 36242624 |
| 2026 | DNA damage burden causes selective CUX2 neuron loss in neuroinflammation. | Nature | 1 | 41922773 |
| 2026 | Expansion of outer cortical CUX2 neurons requires adaptations for DNA repair. | Nature | 1 | 41922774 |
| 2025 | A novel frameshift CUX2 variant in a patient with epilepsy and global developmental delay: Phenotypic and genotypic expansion. | European journal of medical genetics | 0 | 41344425 |
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