FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\E(Pc)
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General Information
Symbol
Dmel\E(Pc)
Species
D. melanogaster
Name
Enhancer of Polycomb
Annotation Symbol
CG7776
Feature Type
FlyBase ID
FBgn0000581
Gene Model Status
Stock Availability
Gene Summary
Enhancer of Polycomb (E(Pc)) encodes a chromatin protein that functions as a suppressor of position-effect variegation. An unusual member of the Polycomb group; it does not exhibit homeotic transformations on its own, but rather enhances mutations in other Polycomb group genes. It forms part of the TIP60 histone acetyltransferase complex, which has been involved in many processes, including both transcriptional activation and repression. [Date last reviewed: 2019-09-26] (FlyBase Gene Snapshot)
Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
2-64
RefSeq locus
NT_033778 REGION:11452043..11465270
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (9 terms)
Molecular Function (1 term)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
Biological Process (3 terms)
Terms Based on Experimental Evidence (2 terms)
CV Term
Evidence
References
inferred from mutant phenotype
involved_in dendrite guidance
inferred from mutant phenotype
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000382618
inferred from biological aspect of ancestor with PANTHER:PTN000382618
inferred from electronic annotation with InterPro:IPR024943
Cellular Component (5 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
inferred from physical interaction with FLYBASE:pont; FB:FBgn0040078
located_in nucleus
inferred from direct assay
inferred from direct assay
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
inferred from electronic annotation with InterPro:IPR024943
inferred from biological aspect of ancestor with PANTHER:PTN000382618
Gene Group (FlyBase)
Protein Family (UniProt)
-
Summaries
Gene Snapshot
Enhancer of Polycomb (E(Pc)) encodes a chromatin protein that functions as a suppressor of position-effect variegation. An unusual member of the Polycomb group; it does not exhibit homeotic transformations on its own, but rather enhances mutations in other Polycomb group genes. It forms part of the TIP60 histone acetyltransferase complex, which has been involved in many processes, including both transcriptional activation and repression. [Date last reviewed: 2019-09-26]
Gene Group (FlyBase)
TIP60 COMPLEX -
The Tip60 chromatin remodeling complex acetylates nucleosomal phospho-histone H2Av and exchanges it with unmodified H2Av. (Adapted from FBrf0185742).
Phenotypic Description (Red Book; Lindsley and Zimm 1992)
E(Pc): Enhancer of Polycomb (R. Denell)
Although E(Pc) heterozygotes are cuticularly normal as larvae and adults, the mutation acts zygotically as a dominant enhancer of the adult homoeotic syndrome of flies heterozygous for Polycomb mutations or Df(3L)Pc-MK. The locus is haplo-abnormal, as heterozygous deficiencies of the E(Pc) locus have an equivalent effect. Heterozygosity for E(Pc) or a deficiency also enhances the adult homoeotic syndrome of Polycomblike mutation or deficiency heterozygotes, and renders the normally recessive mutations esc and l(4)29 slightly pseudodominant, but has no effect on phenotypes associated with AntpNs, Antp73b, AntpScx, AntpEfW15, ScrMsc, Cbx, Ubx, bx34e or abx bx3 pbx heterozygotes. E(Pc) is a recessive lethal mutation; homozygotes and hemizygotes die as late embryos or larvae, which appear cuticularly normal. E(Pc) has dominant maternal as well as zygotic effect on the severity of the embryonic homoeotic syndrome of Pc3 or Df(3L)Pc-MK homozygotes. Zygotic homozygosity for E(Pc) also enhances the embryonic effects of PclW4, PclW5, and PclW6, and E(Pc); l(4)29 doubly homozygous embryos from heterozygous mothers show incomplete head involution, presumably due to a cryptic homoeotic effect.
Summary (Interactive Fly)

novel Polycomb group protein and a suppressor of position effect variegation - acts with extra sex combs to increase homologous recombination in somatic cells

Gene Model and Products
Number of Transcripts
5
Number of Unique Polypeptides
4

Please see the JBrowse view of Dmel\E(Pc) for information on other features

To submit a correction to a gene model please use the Contact FlyBase form

Protein Domains (via Pfam)
Isoform displayed:
Pfam protein domains
InterPro name
classification
start
end
Protein Domains (via SMART)
Isoform displayed:
SMART protein domains
InterPro name
classification
start
end
Structure
Protein 3D structure   (Predicted by AlphaFold)   (AlphaFold entry A0A0B4KFP2)

If you don't see a structure in the viewer, refresh your browser.
Model Confidence:
  • Very high (pLDDT > 90)
  • Confident (90 > pLDDT > 70)
  • Low (70 > pLDDT > 50)
  • Very low (pLDDT < 50)

AlphaFold produces a per-residue confidence score (pLDDT) between 0 and 100. Some regions with low pLDDT may be unstructured in isolation.

Experimentally Determined Structures
Crossreferences
Comments on Gene Model

Double stop-codon suppression (UGA, UAA) postulated; FBrf0216884.

Gene model reviewed during 5.44

Low-frequency RNA-Seq exon junction(s) not annotated.

Gene model reviewed during 5.49

Tissue-specific extension of 3' UTRs observed during later stages (FBrf0218523, FBrf0219848); all variants may not be annotated

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0088139
9408
2023
FBtr0088140
9325
2023
FBtr0330621
10423
1974
FBtr0330622
9554
2033
FBtr0330623
10794
2097
Additional Transcript Data and Comments
Reported size (kB)

8.5, 5.2 (northern blot)

Comments
External Data
Crossreferences
Polypeptide Data
Annotated Polypeptides
Name
FlyBase ID
Predicted MW (kDa)
Length (aa)
Theoretical pI
UniProt
RefSeq ID
GenBank
FBpp0087238
220.9
2023
6.04
FBpp0087239
220.9
2023
6.04
Polypeptides with Identical Sequences

The group(s) of polypeptides indicated below share identical sequence to each other.

2023 aa isoforms: E(Pc)-PA, E(Pc)-PB
Additional Polypeptide Data and Comments
Reported size (kDa)

2023 (aa); 220 (kD predicted)

Comments
External Data
Crossreferences
InterPro - A database of protein families, domains and functional sites
Linkouts
Sequences Consistent with the Gene Model
Mapped Features

Click to get a list of regulatory features (enhancers, TFBS, etc.) and gene disruptions (point mutations, indels, etc.) within or overlapping Dmel\E(Pc) using the Feature Mapper tool.

External Data
Crossreferences
Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
Linkouts
Expression Data
Testis-specificity index

The testis specificity index was calculated from modENCODE tissue expression data by Vedelek et al., 2018 to indicate the degree of testis enrichment compared to other tissues. Scores range from -2.52 (underrepresented) to 5.2 (very high testis bias).

-0.05

Transcript Expression
in situ
Stage
Tissue/Position (including subcellular localization)
Reference
organism

Comment: maternally deposited

northern blot
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
immunolocalization
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data

E(Pc) protein is ubiquitously distributed in embryos. Later in embryogenesis, it is more abundant in the CNS than in other tissues.

Marker for
 
Subcellular Localization
CV Term
Evidence
References
inferred from physical interaction with FLYBASE:pont; FB:FBgn0040078
located_in nucleus
inferred from direct assay
inferred from direct assay
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\E(Pc) in JBrowse
RNA-Seq by Region - Search RNA-Seq expression levels by exon or genomic region
Reference
See Gelbart and Emmert, 2013 for analysis details and data files for all genes.
Developmental Proteome: Life Cycle
Developmental Proteome: Embryogenesis
External Data and Images
Linkouts
BDGP expression data - Patterns of gene expression in Drosophila embryogenesis
DRscDB - A single-cell RNA-seq resource for data mining and data comparison across species
EMBL-EBI Single Cell Expression Atlas - Single cell expression across species
FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
FlyAtlas2 - A Drosophila melanogaster expression atlas with RNA-Seq, miRNA-Seq and sex-specific data
Fly-FISH - A database of Drosophila embryo and larvae mRNA localization patterns
Flygut - An atlas of the Drosophila adult midgut
Images
FlyExpress - Embryonic expression images (BDGP data)
  • Stages(s) 1-3
  • Stages(s) 4-6
  • Stages(s) 7-8
  • Stages(s) 9-10
  • Stages(s) 11-12
  • Stages(s) 13-16
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 19 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 9 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of E(Pc)
Transgenic constructs containing regulatory region of E(Pc)
Aberrations (Deficiencies and Duplications) ( 12 )
Variants
Variant Molecular Consequences
Alleles Representing Disease-Implicated Variants
Phenotypes
For more details about a specific phenotype click on the relevant allele symbol.
Lethality
Allele
Other Phenotypes
Allele
Phenotype manifest in
Allele
Orthologs
Human Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Homo sapiens (Human) (2)
11 of 14
Yes
Yes
11 of 14
Yes
Yes
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Rattus norvegicus (Norway rat) (2)
10 of 14
Yes
Yes
8 of 14
No
Yes
Mus musculus (laboratory mouse) (2)
10 of 14
Yes
Yes
10 of 14
Yes
Yes
Xenopus tropicalis (Western clawed frog) (3)
7 of 13
Yes
Yes
4 of 13
No
Yes
1 of 13
No
Yes
Danio rerio (Zebrafish) (3)
11 of 14
Yes
Yes
11 of 14
Yes
Yes
10 of 14
No
Yes
Caenorhabditis elegans (Nematode, roundworm) (1)
8 of 14
Yes
Yes
Anopheles gambiae (African malaria mosquito) (1)
9 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (3)
6 of 13
Yes
Yes
6 of 13
Yes
Yes
2 of 13
No
Yes
Saccharomyces cerevisiae (Brewer's yeast) (1)
9 of 13
Yes
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
8 of 12
Yes
Yes
Escherichia coli (enterobacterium) (0)
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:E(Pc). Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Human Disease Associations
FlyBase Human Disease Model Reports
    Disease Ontology (DO) Annotations
    Models Based on Experimental Evidence ( 0 )
    Allele
    Disease
    Evidence
    References
    Potential Models Based on Orthology ( 0 )
    Human Ortholog
    Disease
    Evidence
    References
    Modifiers Based on Experimental Evidence ( 4 )
    Disease Associations of Human Orthologs (via DIOPT v9.1 and OMIM)
    Note that ortholog calls supported by only 1 or 2 algorithms (DIOPT score < 3) are not shown.
    Homo sapiens (Human)
    Gene name
    Score
    OMIM
    OMIM Phenotype
    DO term
    Complementation?
    Transgene?
    Functional Complementation Data
    Functional complementation data is computed by FlyBase using a combination of the orthology data obtained from DIOPT and OrthoDB and the allele-level genetic interaction data curated from the literature.
    Interactions
    Summary of Physical Interactions
    Summary of Genetic Interactions
    Interaction Browsers

    Please look at the allele data for full details of the genetic interactions
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    External Data
    Linkouts
    BioGRID - A database of protein and genetic interactions.
    DroID - A comprehensive database of gene and protein interactions.
    MIST (genetic) - An integrated Molecular Interaction Database
    MIST (protein-protein) - An integrated Molecular Interaction Database
    Pathways
    Signaling Pathways (FlyBase)
    Metabolic Pathways
    FlyBase
    External Links
    External Data
    Linkouts
    KEGG Pathways - A collection of manually drawn pathway maps representing knowledge of molecular interaction, reaction and relation networks.
    Reactome - An open-source, open access, manually curated and peer-reviewed pathway database.
    Class of Gene
    Genomic Location and Detailed Mapping Data
    Chromosome (arm)
    2R
    Recombination map
    2-64
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    47F13-47F15
    Limits computationally determined from genome sequence between P{lacW}Tapδk17005&P{lacW}k05103 and P{lacW}l(2)k13403k13403&P{lacW}Egmk14708;
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (17)
    Genomic Clones (24)
    cDNA Clones (63)
     

    Please Note This section lists cDNAs and ESTs that fall within the genomic extent of the gene model, which may include cDNAs and ESTs of genes within introns, or of overlapping genes. Please see JBrowse for alignment of the cDNAs and ESTs to the gene model.

    cDNA clones, fully sequenced
    BDGP DGC clones
    Other clones
      Drosophila Genomics Resource Center cDNA clones

      For each fully sequenced cDNA the DGRC maintains various forms of the cDNA (e.g tagged or untagged) in several different host vectors for subsequent cloning and expression in Drosophila and Drosophila cell lines.

      cDNA Clones, End Sequenced (ESTs)
      BDGP DGC clones
      RNAi and Array Information
      Linkouts
      DRSC - Results frm RNAi screens
      Antibody Information
      Laboratory Generated Antibodies
      Commercially Available Antibodies
       
      Cell Line Information
      Publicly Available Cell Lines
       
        Other Stable Cell Lines
         
          Other Comments

          Mutations in E(Pc) suppress position effect variegation.

          Genetic interactions have been demonstrated between esc, Asx, E(Pc), Pcl, E(z) and sxc. Most duplications of Pc-group genes neither exhibit anterior transformations nor suppress the extra sex comb phenotype of Pc-group mutations, suggesting that not all Pc-group genes behave as predicted by the mass action model.

          Sections of the Scr regulatory region may be important for regulation of Scr by Polycomb- and trithorax-group genes.

          Mosaic and expression pattern analysis reveals that the Pc-group genes do not act only in a common complex or pathway: they must have some independent functions.

          Embryos mutant for two or more Pc group genes (Pc, Scm, Pcl, Psc, Asx, E(Pc), E(z), ph-d, pho and esc) show strong ectopic en expression, but only weak derepression occurs if embryo is mutant at only one of the Pc group genes. This effect is independent of the function of en itself, and wg.

          Transcription unit defined during molecular analysis of the en-inv gene region.

          Relationship to Other Genes
          Source for database merge of
          Additional comments
          Nomenclature History
          Source for database identify of
          Nomenclature comments
          Etymology
          Synonyms and Secondary IDs (16)
          Reported As
          Symbol Synonym
          anon-48Ac
          l(2)28-28-12
          Secondary FlyBase IDs
          • FBgn0015874
          Datasets (0)
          Study focus (0)
          Experimental Role
          Project
          Project Type
          Title
          Study result (0)
          Result
          Result Type
          Title
          External Crossreferences and Linkouts ( 64 )
          Sequence Crossreferences
          NCBI Gene - Gene integrates information from a wide range of species. A record may include nomenclature, Reference Sequences (RefSeqs), maps, pathways, variations, phenotypes, and links to genome-, phenotype-, and locus-specific resources worldwide.
          GenBank Nucleotide - A collection of sequences from several sources, including GenBank, RefSeq, TPA, and PDB.
          GenBank Protein - A collection of sequences from several sources, including translations from annotated coding regions in GenBank, RefSeq and TPA, as well as records from SwissProt, PIR, PRF, and PDB.
          RefSeq - A comprehensive, integrated, non-redundant, well-annotated set of reference sequences including genomic, transcript, and protein.
          UniProt/GCRP - The gene-centric reference proteome (GCRP) provides a 1:1 mapping between genes and UniProt accessions in which a single 'canonical' isoform represents the product(s) of each protein-coding gene.
          UniProt/TrEMBL - Automatically annotated and unreviewed records of protein sequence and functional information
          Other crossreferences
          AlphaFold DB - AlphaFold provides open access to protein structure predictions for the human proteome and other key proteins of interest, to accelerate scientific research.
          BDGP expression data - Patterns of gene expression in Drosophila embryogenesis
          DRscDB - A single-cell RNA-seq resource for data mining and data comparison across species
          EMBL-EBI Single Cell Expression Atlas - Single cell expression across species
          FlyAtlas2 - A Drosophila melanogaster expression atlas with RNA-Seq, miRNA-Seq and sex-specific data
          FlyMine - An integrated database for Drosophila genomics
          InterPro - A database of protein families, domains and functional sites
          KEGG Genes - Molecular building blocks of life in the genomic space.
          MARRVEL_MODEL - MARRVEL (model organism gene)
          Linkouts
          BioGRID - A database of protein and genetic interactions.
          Drosophila Genomics Resource Center - Drosophila Genomics Resource Center (DGRC) cDNA clones
          DroID - A comprehensive database of gene and protein interactions.
          DRSC - Results frm RNAi screens
          Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
          FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
          FlyCyc Genes - Genes from a BioCyc PGDB for Dmel
          Fly-FISH - A database of Drosophila embryo and larvae mRNA localization patterns
          Flygut - An atlas of the Drosophila adult midgut
          iBeetle-Base - RNAi phenotypes in the red flour beetle (Tribolium castaneum)
          Interactive Fly - A cyberspace guide to Drosophila development and metazoan evolution
          KEGG Pathways - A collection of manually drawn pathway maps representing knowledge of molecular interaction, reaction and relation networks.
          MIST (genetic) - An integrated Molecular Interaction Database
          MIST (protein-protein) - An integrated Molecular Interaction Database
          Reactome - An open-source, open access, manually curated and peer-reviewed pathway database.
          References (154)