FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\corto
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General Information
Symbol
Dmel\corto
Species
D. melanogaster
Name
corto
Annotation Symbol
CG2530
Feature Type
FlyBase ID
FBgn0010313
Gene Model Status
Stock Availability
Gene Summary
corto (corto) encodes an Enhancer of Trithorax and Polycomb (ETP) protein that physically interacts with several Polycomb proteins (encoded by Pc, ph-d, ph-p, esc, E(z)) and ETP (encoded by Trl, Dsp1). It also interacts with the product of CycG, with the methylated product of RpL12 (RPL12K3me3), and co-regulates the transcription of genes involved in ribosome biogenesis. [Date last reviewed: 2019-03-21] (FlyBase Gene Snapshot)
Also Known As

l(3)neo31, ccf, Centrosomal and chromosomal factor, l(3)07128

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
3-47.1
RefSeq locus
NT_033777 REGION:5077779..5087072
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (15 terms)
Molecular Function (4 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
inferred from direct assay
inferred from physical interaction with UniProtKB:P41046
inferred from physical interaction with UniProtKB:P39769
inferred from physical interaction with UniProtKB:P42124
inferred from physical interaction with UniProtKB:Q24338
inferred from physical interaction with UniProtKB:Q9VHA0
inferred from physical interaction with UniProtKB:P41046
Terms Based on Predictions or Assertions (0 terms)
Biological Process (5 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
inferred from genetic interaction with FLYBASE:Abd-B; FB:FBgn0000015
inferred from mutant phenotype
inferred from mutant phenotype
inferred from direct assay
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred by curator from GO:0035098
inferred by curator from GO:0035102
Cellular Component (6 terms)
Terms Based on Experimental Evidence (6 terms)
CV Term
Evidence
References
located_in centrosome
inferred from direct assay
located_in cytoplasm
inferred from high throughput direct assay
inferred from physical interaction with UniProtKB:P42124
inferred from physical interaction with UniProtKB:Q24338
located_in nucleus
inferred from direct assay
inferred from direct assay
part_of PRC1 complex
inferred from physical interaction with UniProtKB:P39769
inferred from physical interaction with UniProtKB:Q9VHA0
Terms Based on Predictions or Assertions (0 terms)
Gene Group (FlyBase)
Protein Family (UniProt)
-
Protein Signatures (InterPro)
    -
    Summaries
    Gene Snapshot
    corto (corto) encodes an Enhancer of Trithorax and Polycomb (ETP) protein that physically interacts with several Polycomb proteins (encoded by Pc, ph-d, ph-p, esc, E(z)) and ETP (encoded by Trl, Dsp1). It also interacts with the product of CycG, with the methylated product of RpL12 (RPL12K3me3), and co-regulates the transcription of genes involved in ribosome biogenesis. [Date last reviewed: 2019-03-21]
    Protein Function (UniProtKB)
    Essential protein required for proper condensation of mitotic chromosomes and progression through mitosis (PubMed:9463384). Binds to specific polytene chromosome sites, many of which are shared with the posterior sex combs (Psc) protein (PubMed:9463384). Involved in maintaining Abd-B repression outside its normal expression domain (PubMed:18286205, PubMed:18667003).
    (UniProt, P41046)
    Summary (Interactive Fly)

    Chromodomain protein - partners with CycG which regulates the activity of Corto at chromatin - acts alternatively as an enhancer of TrxG and an Enhancer of PcG

    Gene Model and Products
    Number of Transcripts
    5
    Number of Unique Polypeptides
    1

    Please see the JBrowse view of Dmel\corto 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 P41046)

    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

    Gene model reviewed during 5.55

    Gene model reviewed during 5.47

    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)
    FBtr0078844
    3036
    550
    FBtr0308118
    3537
    550
    FBtr0308119
    9294
    550
    FBtr0308120
    3352
    550
    FBtr0345141
    2992
    550
    Additional Transcript Data and Comments
    Reported size (kB)

    3.6, 3.2 (northern blot)

    Comments
    External Data
    Crossreferences
    Polypeptide Data
    Annotated Polypeptides
    Name
    FlyBase ID
    Predicted MW (kDa)
    Length (aa)
    Theoretical pI
    UniProt
    RefSeq ID
    GenBank
    FBpp0078485
    58.8
    550
    10.32
    FBpp0300440
    58.8
    550
    10.32
    FBpp0300441
    58.8
    550
    10.32
    FBpp0300442
    58.8
    550
    10.32
    FBpp0311362
    58.8
    550
    10.32
    Polypeptides with Identical Sequences

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

    Additional Polypeptide Data and Comments
    Reported size (kDa)

    550 (aa); 68 (kD observed); 59 (kD predicted)

    Comments

    corto protein binds to ~100 sites on polytene chromosomes. It shares a number of polytene chromosome binding sites with Psc protein.

    Amino acid sequence is substantially different from that of g1304060

    External Data
    Subunit Structure (UniProtKB)

    Homodimer (PubMed:12771214). Interacts with esc, Trl, E(z), scm and ph-p in vitro (PubMed:12771214). Found in vivo in an esc-containing complex, which may be the Esc/E(z) complex (PubMed:12771214). Also found in vivo in a Pc-containing complex that may be the PRC1 complex, but does not interact with Pc directly (PubMed:12771214). Interacts with cyclin CycG (PubMed:18286205).

    (UniProt, P41046)
    Crossreferences
    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\corto 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).

    -1.29

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

    Comment: maternally deposited

    dorsal ectoderm anlage

    Comment: anlage in statu nascendi

    ventral ectoderm anlage

    Comment: anlage in statu nascendi

    antennal anlage in statu nascendi

    Comment: reported as procephalic ectoderm anlage in statu nascendi

    dorsal head epidermis anlage in statu nascendi

    Comment: reported as procephalic ectoderm anlage in statu nascendi

    visual anlage in statu nascendi

    Comment: reported as procephalic ectoderm anlage in statu nascendi

    antennal anlage

    Comment: reported as procephalic ectoderm anlage

    central brain anlage

    Comment: reported as procephalic ectoderm anlage

    dorsal head epidermis anlage

    Comment: reported as procephalic ectoderm anlage

    visual anlage

    Comment: reported as procephalic ectoderm anlage

    antennal primordium

    Comment: reported as procephalic ectoderm primordium

    central brain primordium

    Comment: reported as procephalic ectoderm primordium

    visual primordium

    Comment: reported as procephalic ectoderm primordium

    dorsal head epidermis primordium

    Comment: reported as procephalic ectoderm primordium

    lateral head epidermis primordium

    Comment: reported as procephalic ectoderm primordium

    ventral head epidermis primordium

    Comment: reported as procephalic ectoderm primordium

    northern blot
    Stage
    Tissue/Position (including subcellular localization)
    Reference

    Comment: reference states >=4 hr AEL

    Additional Descriptive Data
    Marker for
     
    Subcellular Localization
    CV Term
    Polypeptide Expression
    Additional Descriptive Data

    corto protein is a nuclear protein. It is associated with condensing chromosomes in early prophase. It continues to be associated with chromosomes in metaphase and anaphase while in telophase, the signal decreases and spreads throughout the nucleus. corto protein is also observed in centrosomes.

    Marker for
     
    Subcellular Localization
    CV Term
    Evidence
    References
    located_in centrosome
    inferred from direct assay
    located_in cytoplasm
    inferred from high throughput direct assay
    inferred from physical interaction with UniProtKB:P42124
    inferred from physical interaction with UniProtKB:Q24338
    located_in nucleus
    inferred from direct assay
    inferred from direct assay
    part_of PRC1 complex
    inferred from physical interaction with UniProtKB:P39769
    inferred from physical interaction with UniProtKB:Q9VHA0
    Expression Deduced from Reporters
    High-Throughput Expression Data
    Associated Tools

    JBrowse - Visual display of RNA-Seq signals

    View Dmel\corto 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 ( 25 )
    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 corto
    Transgenic constructs containing regulatory region of corto
    Aberrations (Deficiencies and Duplications) ( 10 )
    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
    Sterility
    Allele
    Other Phenotypes
    Allele
    Phenotype manifest in
    Allele
    adult abdomen & macrochaeta
    adult thorax & macrochaeta
    Orthologs
    Human Orthologs (via DIOPT v9.1)
    Species\Gene Symbol
    Score
    Best Score
    Best Reverse Score
    Alignment
    Complementation?
    Transgene?
    Homo sapiens (Human) (0)
    Model Organism Orthologs (via DIOPT v9.1)
    Species\Gene Symbol
    Score
    Best Score
    Best Reverse Score
    Alignment
    Complementation?
    Transgene?
    Rattus norvegicus (Norway rat) (0)
    Mus musculus (laboratory mouse) (0)
    Xenopus tropicalis (Western clawed frog) (0)
    Danio rerio (Zebrafish) (0)
    Caenorhabditis elegans (Nematode, roundworm) (0)
    Anopheles gambiae (African malaria mosquito) (1)
    5 of 12
    Yes
    Yes
    Arabidopsis thaliana (thale-cress) (0)
    Saccharomyces cerevisiae (Brewer's yeast) (0)
    Schizosaccharomyces pombe (Fission yeast) (0)
    Escherichia coli (enterobacterium) (0)
    Other Organism Orthologs (via OrthoDB)
    Data provided directly from OrthoDB:corto. 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 ( 0 )
      Allele
      Disease
      Interaction
      References
      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
      Interaction Browsers

      Please see the Physical Interaction reports below for full details
      protein-protein
      Physical Interaction
      Assay
      References
      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
      Subunit Structure (UniProtKB)
      Homodimer (PubMed:12771214). Interacts with esc, Trl, E(z), scm and ph-p in vitro (PubMed:12771214). Found in vivo in an esc-containing complex, which may be the Esc/E(z) complex (PubMed:12771214). Also found in vivo in a Pc-containing complex that may be the PRC1 complex, but does not interact with Pc directly (PubMed:12771214). Interacts with cyclin CycG (PubMed:18286205).
      (UniProt, P41046 )
      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
      Class of Gene
      Genomic Location and Detailed Mapping Data
      Chromosome (arm)
      3R
      Recombination map
      3-47.1
      Cytogenetic map
      Sequence location
      FlyBase Computed Cytological Location
      Cytogenetic map
      Evidence for location
      82E7-82E7
      Limits computationally determined from genome sequence between P{PZ}l(3)0273302733 and P{EP}EP974
      Experimentally Determined Cytological Location
      Cytogenetic map
      Notes
      References
      82E5-82E7
      (determined by in situ hybridisation) 82F1--8 (determined by in situ hybridisation)
      82E-82E
      (determined by in situ hybridisation)
      Stated to map to 42A (though subsequent information (FBrf0075177) corrected this to 82E).
      Experimentally Determined Recombination Data
      Left of (cM)
      Right of (cM)
      Notes
      Stocks and Reagents
      Stocks (14)
      Genomic Clones (22)
      cDNA Clones (112)
       

      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)
        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

            Identification: Enhancer trap expression pattern survey for loci expressed in the ring gland.

            Mutations in corto affect progression through mitosis and interact with Polycomb group mutations.

            Overexpression of corto causes embryonic or late larval lethality depending on the time and amount of product delivered. Adult escapers show phenotypes suggesting a reduction in the number of imaginal cells.

            Hypomorphic mutations in corto lead to a neoplastic tumoral phenotype affecting the imaginal discs and the optic lobes of the brain.

            Identification: Expression of the enhancer trap insertion P{A92}corto82E.A46.

            Relationship to Other Genes
            Source for database merge of

            Source for merge of: corto l(3)neo31

            Source for merge of: corto anon-WO02059370.59

            Additional comments

            Source for merge of corto anon-WO02059370.59 was sequence comparison ( date:051113 ).

            Nomenclature History
            Source for database identify of

            Source for identity of: corto CG2530

            Nomenclature comments
            Etymology
            Synonyms and Secondary IDs (13)
            Reported As
            Name Synonyms
            Secondary FlyBase IDs
            • FBgn0010917
            • FBgn0011464
            • FBgn0011465
            • FBgn0016125
            • FBgn0066000
            Datasets (0)
            Study focus (0)
            Experimental Role
            Project
            Project Type
            Title
            Study result (0)
            Result
            Result Type
            Title
            External Crossreferences and Linkouts ( 59 )
            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/Swiss-Prot - Manually annotated and reviewed records of protein sequence and functional information
            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
            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
            MIST (genetic) - An integrated Molecular Interaction Database
            MIST (protein-protein) - An integrated Molecular Interaction Database
            References (116)