Affinage

CEBPE

CCAAT/enhancer-binding protein epsilon · UniProt Q15744

Length
281 aa
Mass
30.6 kDa
Annotated
2026-06-09
42 papers in source corpus 10 papers cited in narrative 10 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 6/6 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

C/EBPε is a myeloid-lineage transcription factor that governs terminal granulocytic differentiation by directly activating granule gene programs while restraining inflammatory and stress-response circuits (PMID:28369034, PMID:29773596). Its activity at neutrophil secondary granule gene promoters depends on physical interaction with the SWI/SNF (BAF) subunit SMARCD2, which is required for C/EBPε recruitment to these promoters; loss of SMARCD2 or loss-of-function CEBPE mutations abolishes this recruitment and blocks granulopoiesis (PMID:28369034). Direct transcriptional targets include CARD10, whose induction is needed for normal granulopoiesis (PMID:29773596). CEBPE expression is autoregulated through a +6-kb downstream enhancer bound by both CEBPA and C/EBPε itself, deletion of which blocks granulocyte maturation (PMID:30952671), and is further activated by the H3K36me2 reader ZMYND8 (PMID:40347515). As a repressor, C/EBPε restrains the adaptive unfolded protein response by suppressing ERN1, XBP1, and ATF6 (PMID:40347515) and limits noncanonical inflammasome activity by holding down NLRP3 and caspase-5 through association with transcriptional repressors (PMID:31201888). Disease-causing CEBPE mutations partition by mechanism: a gain-of-function R219H allele weakens repressor association, increases chromatin occupancy, and drives autoinflammatory inflammasome activation (PMID:31201888), whereas loss-of-function alleles cause specific granule deficiency by preventing nuclear localization (V218A) or by abolishing DNA binding, nuclear import, and interaction with GATA1 and PU.1 (del11 frameshift) (PMID:29651288, PMID:40581342).

Mechanistic history

Synthesis pass · year-by-year structured walk · 9 steps
  1. 1995 Low

    Establishing the chromosomal location of the gene anchored CEBPE/CRP1 to a defined locus before any functional role was known.

    Evidence interspecific backcross chromosomal mapping in mouse

    PMID:8530045

    Open questions at the time
    • mapping only, no functional mechanism established
    • no link to granulopoiesis or transcriptional activity
    • human gene function not addressed
  2. 2017 High

    Identifying SMARCD2 as a physical partner answered how C/EBPε is delivered to secondary granule gene promoters, defining a chromatin-remodeling dependency upstream of granulopoiesis.

    Evidence reciprocal Co-IP and ChIP with Smarcd2-knockout mouse phenotype and epistasis of SGD patient mutations

    PMID:28369034

    Open questions at the time
    • does not define the C/EBPε domain mediating SMARCD2 contact
    • full set of co-recruited granule genes not enumerated
    • structural basis of the interaction unknown
  3. 2018 Medium

    Defining CARD10 as a direct C/EBPε target and tracing CEBPE occupancy at energy-metabolism and developmental genes in leukemic cells expanded the target repertoire beyond granule structural genes.

    Evidence ChIP and Cebpe-knockout mouse for CARD10; ChIP and RNA-seq in CEBPE-depleted ALL cells with reporter assay

    PMID:29773596 PMID:29977016

    Open questions at the time
    • direct versus indirect status of metabolic targets not fully resolved
    • single-lab ChIP without orthogonal binding validation
    • mechanism linking CARD10 to granulopoiesis not defined
  4. 2018 Medium

    The V218A mutation showed that disrupted nuclear localization, rather than loss of the protein, can drive specific granule deficiency, mechanistically separating localization defects from DNA-binding defects.

    Evidence subcellular localization of mutant vs wild-type protein and proteomics of patient neutrophils

    PMID:29651288

    Open questions at the time
    • single lab on rare patient samples
    • proposed repression of LINC complex proteins not reconstituted
    • no in vitro mechanistic confirmation
  5. 2019 High

    Discovery of the +6-kb autoregulatory enhancer answered how CEBPE expression itself is controlled, revealing a CEBPA/C/EBPε feed-forward node required for granulocyte maturation.

    Evidence 4C-seq, CRISPR/dCas9-KRAB repression, germline enhancer deletion in mice, and ChIP

    PMID:30952671

    Open questions at the time
    • cofactors at the enhancer beyond CEBPA/C/EBPε not defined
    • human enhancer function not directly tested
    • kinetics of the autoregulatory loop unresolved
  6. 2019 High

    The gain-of-function R219H allele demonstrated that weakened repressor association and increased chromatin occupancy convert C/EBPε into a driver of noncanonical inflammasome activation, defining an autoinflammatory disease mechanism distinct from granule deficiency.

    Evidence ChIP-seq, RNA-seq, proteomics, and inflammasome assays in patient-derived macrophages

    PMID:31201888

    Open questions at the time
    • identity of the displaced repressors not fully resolved
    • whether the same repressors operate in granulopoiesis unknown
    • structural effect of R219H on the protein not determined
  7. 2025 Medium

    Placing ZMYND8 upstream and UPR genes downstream connected histone-mark-dependent activation of CEBPE to repression of ERN1/XBP1/ATF6, extending C/EBPε function into tumor-suppressive control of the unfolded protein response.

    Evidence Co-IP of ZMYND8 with H3K36me2, ChIP-seq, and CEBPE overexpression/knockdown transcriptomics in multiple myeloma cells

    PMID:40347515

    Open questions at the time
    • direct binding of C/EBPε to UPR gene promoters versus indirect effect not fully resolved
    • single-lab finding in one tumor context
    • generalizability beyond myeloma unknown
  8. 2025 Medium

    Comparing the del11 frameshift to missense/in-frame variants resolved a genotype-mechanism-severity relationship, showing that combined loss of DNA binding, nuclear import, and GATA1/PU.1 interaction produces the most severe SGD phenotype.

    Evidence forced expression in ES cells, localization in NIH3T3, DNA-binding and protein-interaction assays comparing del11, ΔRS, and wild-type

    PMID:40581342

    Open questions at the time
    • GATA1/PU.1 cooperation not validated on endogenous loci
    • single-lab heterologous expression systems
    • in vivo correlate of partial-function variants not tested
  9. 2025 Low

    A proposed CEBPE-LTF-STAT3 feedback loop extended C/EBPε function to a non-hematopoietic context, linking its loss to inflammatory cartilage endplate degeneration.

    Evidence overexpression/knockdown in endplate chondrocytes, reporter assays, pathway markers, and in vivo LNP delivery of CEBPE

    PMID:40677394

    Open questions at the time
    • feedback loop not directly reconstituted
    • primarily overexpression/knockdown with pathway markers
    • direct LTF promoter binding by C/EBPε not established

Open questions

Synthesis pass · forward-looking unresolved questions
  • How C/EBPε partitions between its activating and repressive functions across different lineages and the structural basis of its cofactor and DNA contacts remain unresolved.
  • no structural model of C/EBPε with SMARCD2, GATA1, or PU.1
  • the specific repressors displaced by gain-of-function mutations are unidentified
  • rules governing context-specific activation vs repression unknown

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0140110 transcription regulator activity 5 GO:0003677 DNA binding 2
Localization
GO:0005634 nucleus 2
Pathway
R-HSA-1266738 Developmental Biology 3 R-HSA-74160 Gene expression (Transcription) 3 R-HSA-168256 Immune System 1
Partners
CEBPAGATA1SMARCD2SPI1ZMYND8

Evidence

Reading pass · 10 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2017 SMARCD2, a subunit of SWI/SNF (BAF) chromatin-remodeling complexes, physically interacts with CEBPε and is required for CEBPε recruitment to promoters of neutrophilic secondary granule genes; loss of SMARCD2 or loss-of-function CEBPE mutations both abolish this interaction and block granulocytic differentiation, placing SMARCD2 upstream of CEBPε-dependent secondary granule gene expression. Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), Smarcd2-knockout mouse model with neutrophil/eosinophil differentiation phenotype, epistasis analysis of SGD patient mutations Nature genetics High 28369034
2019 A gain-of-function homozygous Arg219His mutation in C/EBPε causes genome-wide dysregulation of 464 genes by decreasing association with transcriptional repressors, increasing chromatin occupancy, and elevating expression of NLRP3 and constitutively expressed caspase-5 in macrophages, leading to noncanonical inflammasome activation and autoinflammatory disease. ChIP-sequencing, RNA-sequencing, proteomics, functional inflammasome assays in primary macrophages from patients with homozygous R219H CEBPE mutation The Journal of allergy and clinical immunology High 31201888
2019 An enhancer element located 6 kb downstream of the Cebpe transcriptional start site is bound by CEBPA and CEBPε itself and is required for normal CEBPE expression and granulocytic differentiation; deletion of this enhancer by CRISPR/Cas9 in mice reduces CEBPE and its target gene levels, causing a severe block in granulocyte maturation. Circular chromosome conformation capture sequencing (4C-seq), CRISPR/dCas9-KRAB repression, CRISPR/Cas9 germline enhancer deletion in mice, ChIP for CEBPA/CEBPε binding Blood High 30952671
2018 The heterozygous missense mutation p.Val218Ala in CEBPE prevents nuclear localization of the C/EBPε protein, causing specific granule deficiency (SGD) with clustered/polarized granules, mixed granule protein content, and absence of specific granule proteins and glycoepitopes in neutrophils; increased linker of nucleoskeleton and cytoskeleton (LINC) complex proteins (nesprin-2, vimentin, lamin-B2) were observed, suggesting C/EBPε normally represses these to enable nuclear segmentation. Immunofluorescence/subcellular localization of mutant vs. wild-type C/EBPε, proteomics of SGD patient neutrophils, flow cytometry, immunohistochemistry of granule proteins Frontiers in immunology Medium 29651288
2018 CEBPE binds promoters of electron transport and energy generation genes in ALL cells, and its depletion reduces ALL cell growth; CEBPE also regulates expression of genes involved in B-cell development (IL7R), apoptosis (BCL2), and methotrexate resistance (RASSF4), as demonstrated by RNA-seq in CEBPE-depleted cells and ChIP in ALL blasts. CEBPE knockdown in ALL cells, RNA-seq, ChIP for promoter occupancy, reporter assay for rs2239630 promoter variant activity Leukemia Medium 29977016
2018 CARD10 is a direct transcriptional target of C/EBPε; CEBPE binds regulatory elements upstream of the murine Card10 locus, Card10 expression is significantly reduced in Cebpe knockout mice, and silencing Card10 impairs granulopoiesis in human cell lines and murine primary cells. ChIP for CEBPE binding at Card10 locus, Cebpe-knockout mouse model, Card10 siRNA knockdown with granulopoiesis phenotype assay Haematologica Medium 29773596
2025 ZMYND8 binds the H3K36me2 histone mark via its PWWP domain and activates CEBPE transcription in an H3K36me2-dependent manner; CEBPE in turn transcriptionally represses ERN1, XBP1, and ATF6 to suppress adaptive unfolded protein response (UPR) pathways and inhibit multiple myeloma cell growth. Co-immunoprecipitation of ZMYND8 with H3K36me2, ChIP-seq, transcriptomic analysis after ZMYND8 knockdown, CEBPE overexpression/knockdown assays in MM cells Advanced science Medium 40347515
2025 The frameshift variant del11 (c.655_665del) of CEBPE causes complete loss of DNA-binding to target sequences, cytoplasmic retention (loss of nuclear localization), and failure to interact with transcription factors GATA-binding protein 1 and purine-rich box-1 (PU.1), resulting in a more severe SGD phenotype compared to missense/in-frame deletion variants that retain partial function. Forced expression in embryonic stem cells, immunofluorescence for subcellular localization in NIH3T3 cells, DNA-binding assays, protein-protein interaction assays comparing del11, ΔRS, and wild-type C/EBPε Clinical and experimental immunology Medium 40581342
2025 CEBPE deficiency in endplate chondrocytes downregulates lactoferrin (LTF) transcription, which activates the JAK2/STAT3 inflammatory signaling pathway; activated STAT3 then further inhibits CEBPE transcription, forming a CEBPE-LTF-STAT3 positive feedback loop that drives cartilage endplate degeneration. CEBPE overexpression and knockdown in endplate chondrocytes, transcriptional reporter assays, measurement of LTF and STAT3 pathway activation, lipid nanoparticle delivery of CEBPE plasmid in vivo Materials today. Bio Low 40677394
1995 The gene encoding C/EBPε (then called CRP1 in mouse genomic nomenclature) maps to mouse chromosome 14, syntenic with human chromosome 14q11.2. Mouse chromosomal mapping by interspecific backcross analysis Genomics Low 8530045

Source papers

Stage 0 corpus · 42 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2003 Cysteine-rich LIM-only proteins CRP1 and CRP2 are potent smooth muscle differentiation cofactors. Developmental cell 212 12530967
1997 CRP1, a LIM domain protein implicated in muscle differentiation, interacts with alpha-actinin. The Journal of cell biology 118 9314536
2017 SMARCD2 subunit of SWI/SNF chromatin-remodeling complexes mediates granulopoiesis through a CEBPɛ dependent mechanism. Nature genetics 63 28369034
2005 Cysteine-rich protein 1 (CRP1) regulates actin filament bundling. BMC cell biology 60 16336664
1999 The LIM protein, CRP1, is a smooth muscle marker. Developmental dynamics : an official publication of the American Association of Anatomists 50 10090149
2011 Role of 657del5 NBN mutation and 7p12.2 (IKZF1), 9p21 (CDKN2A), 10q21.2 (ARID5B) and 14q11.2 (CEBPE) variation and risk of childhood ALL in the Polish population. Leukemia research 49 21889209
2013 Association of three polymorphisms in ARID5B, IKZF1 and CEBPE with the risk of childhood acute lymphoblastic leukemia in a Chinese population. Gene 47 23608171
2019 Identification of a novel enhancer of CEBPE essential for granulocytic differentiation. Blood 46 30952671
2019 Gain-of-function CEBPE mutation causes noncanonical autoinflammatory inflammasomopathy. The Journal of allergy and clinical immunology 42 31201888
2013 Genetic variants in ARID5B and CEBPE are childhood ALL susceptibility loci in Hispanics. Cancer causes & control : CCC 41 23836053
1999 Solution structure of the chicken cysteine-rich protein, CRP1, a double-LIM protein implicated in muscle differentiation. Biochemistry 35 10231520
1997 Molecular and cellular characterization of CRP1, a Drosophila chromatin decondensation protein. Journal of structural biology 34 9087911
1998 LIM domains of cysteine-rich protein 1 (CRP1) are essential for its zyxin-binding function. The Biochemical journal 29 9560318
1995 Mouse chromosomal location of the CCAAT/enhancer binding proteins C/EBP beta (Cebpb), C/EBP delta (Cebpd), and CRP1 (Cebpe). Genomics 27 8530045
2018 CEBPE-Mutant Specific Granule Deficiency Correlates With Aberrant Granule Organization and Substantial Proteome Alterations in Neutrophils. Frontiers in immunology 26 29651288
2007 Cytoskeleton-interacting LIM-domain protein CRP1 suppresses cell proliferation and protects from stress-induced cell death. Experimental cell research 22 18177859
2018 Genetic predisposition to B-cell acute lymphoblastic leukemia at 14q11.2 is mediated by a CEBPE promoter polymorphism. Leukemia 20 29977016
2011 CRP1, a protein localized in filopodia of growth cones, is involved in dendritic growth. The Journal of neuroscience : the official journal of the Society for Neuroscience 16 22090504
2017 Contributions of IKZF1, DDC, CDKN2A, CEBPE, and LMO1 Gene Polymorphisms to Acute Lymphoblastic Leukemia in a Yemeni Population. Genetic testing and molecular biomarkers 15 28768142
2014 CEBPE polymorphism confers an increased risk of childhood acute lymphoblastic leukemia: a meta-analysis of 11 case-control studies with 5,639 cases and 10,036 controls. Annals of hematology 13 25195121
2023 Management of Black Root Disease-Causing Fungus Fusarium solani CRP1 by Endophytic Bacillus siamensis CNE6 through Its Metabolites and Activation of Plant Defense Genes. Microbiology spectrum 11 36744908
2015 Association between CEBPE Variant and Childhood Acute Leukemia Risk: Evidence from a Meta-Analysis of 22 Studies. PloS one 9 25938438
2018 CARD10, a CEBPE target involved in granulocytic differentiation. Haematologica 8 29773596
2013 Identification of functional nucleotide and haplotype variants in the promoter of the CEBPE gene. Journal of human genetics 8 23719191
1995 cDNA encoding a chicken protein (CRP1) with homology to hnRNP type A/B. Biochimica et biophysica acta 8 7711075
2019 Association of genes ARID5B, CEBPE and folate pathway with acute lymphoblastic leukemia in a population from the Brazilian Amazon region. Leukemia research reports 7 31867206
2008 Translocation (14;14)(q11;q32) with simultaneous involvement of the IGH and CEBPE genes in B-lineage acute lymphoblastic leukemia. Cancer genetics and cytogenetics 7 19027493
2025 ZMYND8 Reads H3K36me2 to Activate CEBPE Transcription and Suppress Multiple Myeloma Progression through the Inhibition of Adaptive UPR Pathways. Advanced science (Weinheim, Baden-Wurttemberg, Germany) 5 40347515
2023 CRP‑1 promotes the malignant behavior of hepatocellular carcinoma cells via activating epithelial‑mesenchymal transition and Wnt/β‑catenin signaling. Experimental and therapeutic medicine 5 37273753
2020 The cruciform DNA-binding protein Crp1 stimulates the endonuclease activity of Mus81-Mms4 in Saccharomyces cerevisiae. FEBS letters 5 32936932
2020 Structural Characterization of Black Widow Spider Dragline Silk Proteins CRP1 and CRP4. Molecules (Basel, Switzerland) 4 32674428
2015 A common genetic variation in CEBPE and acute lymphoblastic leukemia: a meta-analysis of the available evidence. OncoTargets and therapy 4 26388693
2023 Protein-protein interaction of LDH and CRP-1 with hematotoxin snake venom proteins of all species of snake: An in silico approach. International journal of health sciences 3 36891039
2023 ARID5B, IKZF1, GATA3, CEBPE, and CDKN2A germline polymorphisms and predisposition to childhood acute lymphoblastic leukemia. Pediatric hematology and oncology 3 37578068
2022 A Novel CEBPE Variant Causes Severe Infections and Profound Neutropenia. Journal of clinical immunology 3 35726044
2016 The complex translocation (9;14;14) involving IGH and CEBPE genes suggests a new subgroup in B-lineage acute lymphoblastic leukemia. Genetics and molecular biology 3 27007892
2016 First description of the rs45496295 polymorphism of the C/EBPE gene in β-thalassemia intermedia patients. Hemoglobin 3 27829304
2011 Double CEBPE-IGH rearrangement due to chromosome duplication and cryptic insertion in an adult with B-cell acute lymphoblastic leukemia. Cancer genetics 2 22137487
2025 Genotype-phenotype correlations in specific granule deficiency: loss of DNA-binding ability and impaired nuclear localization cause severe manifestations due to the c.655_665del CEBPE variant. Clinical and experimental immunology 1 40581342
2025 Deliver CEBPE via cartilage targeting Lipid nanoparticle to block CEBPE-LTF-STAT3 positive feedback loop for efficient treatment of cartilage endplate degeneration. Materials today. Bio 1 40677394
2025 A rare case of B-cell acute lymphoblastic leukemia with translocation (14;14)(q11.2;q32) involving IGH and CEBPE with review of the literature. Journal of hematopathology 0 40341597
2023 Significance of CEBPE Gene Promoter Polymorphism (Rs2239630 G > A ) Assessment in Childhood B-cell Acute Lymphoblastic Leukemia. Journal of pediatric hematology/oncology 0 36897378

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