FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\asl
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General Information
Symbol
Dmel\asl
Species
D. melanogaster
Name
asterless
Annotation Symbol
CG2919
Feature Type
FlyBase ID
FBgn0261004
Gene Model Status
Stock Availability
Gene Summary
asterless (asl) encodes a component of the centriole that is required for centrosome function. It contributes to asymmetric cell division, sperm development and centriole replication and elongation. [Date last reviewed: 2019-03-07] (FlyBase Gene Snapshot)
Also Known As

Cep152, mecD, sdu

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
3-47.5
RefSeq locus
NT_033777 REGION:5603236..5606543
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 (2 terms)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
inferred from physical interaction with FLYBASE:Sas-4; FB:FBgn0011020
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN008686725
Biological Process (8 terms)
Terms Based on Experimental Evidence (7 terms)
CV Term
Evidence
References
inferred from direct assay
inferred from mutant phenotype
involved_in centrosome cycle
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
involved_in centrosome cycle
inferred from biological aspect of ancestor with PANTHER:PTN008686726
Cellular Component (5 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
colocalizes_with centriole
inferred from direct assay
located_in centrosome
inferred from direct assay
inferred from direct assay
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN008686725
Gene Group (FlyBase)
Protein Family (UniProt)
-
Protein Signatures (InterPro)
    -
    Summaries
    Gene Snapshot
    asterless (asl) encodes a component of the centriole that is required for centrosome function. It contributes to asymmetric cell division, sperm development and centriole replication and elongation. [Date last reviewed: 2019-03-07]
    Summary (Interactive Fly)

    coiled-coil protein - component of pancentriole and basal body - involved in stabilization/maintenance of pericentriolar material at the centrosome

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

    Please see the JBrowse view of Dmel\asl 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 Q9VNE4)

    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 5.46

    Transcript Data
    Annotated Transcripts
    Name
    FlyBase ID
    RefSeq ID
    Length (nt)
    Assoc. CDS (aa)
    FBtr0078743
    3187
    994
    Additional Transcript Data and Comments
    Reported size (kB)
    Comments
    External Data
    Crossreferences
    Polypeptide Data
    Annotated Polypeptides
    Name
    FlyBase ID
    Predicted MW (kDa)
    Length (aa)
    Theoretical pI
    UniProt
    RefSeq ID
    GenBank
    FBpp0078392
    116.6
    994
    5.90
    Polypeptides with Identical Sequences

    There is only one protein coding transcript and one polypeptide associated with this gene

    Additional Polypeptide Data and Comments
    Reported size (kDa)
    Comments
    External Data
    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\asl 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).

    0.89

    Transcript Expression
    Additional Descriptive Data
    Marker for
     
    Subcellular Localization
    CV Term
    Polypeptide Expression
    immunolocalization
    Stage
    Tissue/Position (including subcellular localization)
    Reference
    Additional Descriptive Data
    Marker for
     
    Subcellular Localization
    CV Term
    Evidence
    References
    colocalizes_with centriole
    inferred from direct assay
    located_in centrosome
    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\asl 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
    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
    Alleles, Insertions, Transgenic Constructs, and Aberrations
    Classical and Insertion Alleles ( 9 )
    For All Classical and Insertion Alleles Show
     
    Other relevant insertions
    Transgenic Constructs ( 31 )
    For All Alleles Carried on Transgenic Constructs Show
    Transgenic constructs containing/affecting coding region of asl
    Transgenic constructs containing regulatory region of asl
    Aberrations (Deficiencies and Duplications) ( 1 )
    Inferred from experimentation ( 1 )
    Inferred from location ( 5 )
    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
    anaphase & condensed nuclear chromosome
    anaphase & condensed nuclear chromosome (with asl2)
    anaphase & condensed nuclear chromosome (with asl3)
    aster & spermatocyte
    centrosome & spermatocyte
    cilium & mechanosensory sensory organ
    larval brain & ganglion mother cell
    larval brain & ganglion mother cell (with asl2)
    larval brain & ganglion mother cell (with asl3)
    larval brain & ganglion mother cell & aster
    larval brain & ganglion mother cell & aster (with asl2)
    larval brain & ganglion mother cell & aster (with asl3)
    larval brain & ganglion mother cell & centrosome
    larval brain & ganglion mother cell & centrosome (with asl2)
    larval brain & ganglion mother cell & centrosome (with asl3)
    larval brain & neuroblast
    larval brain & neuroblast (with asl2)
    larval brain & neuroblast (with asl3)
    larval brain & neuroblast & aster
    larval brain & neuroblast & aster (with asl2)
    larval brain & neuroblast & aster (with asl3)
    larval brain & neuroblast & centrosome
    larval brain & neuroblast & centrosome (with asl2)
    larval brain & neuroblast & centrosome (with asl3)
    larval brain & neuroblast & spindle
    meiotic anaphase I & nuclear chromosome
    meiotic cell cycle & spermatocyte
    meiotic cell cycle & spindle | male
    microtubule basal body & mechanosensory sensory organ
    microtubule basal body & spermatid
    microtubule basal body & spermatocyte (with Df(3R)ED5177)
    mitosis & nuclear chromosome
    mitosis & nuclear chromosome (with asl2)
    mitosis & nuclear chromosome (with asl3)
    neuroblast & nucleus
    neuroblast & nucleus (with asl2)
    neuroblast & nucleus (with asl3)
    onion stage spermatid & nucleus
    spermatocyte & aster
    spermatocyte & aster (with asl1)
    spermatocyte & aster (with asl2)
    spermatocyte & aster (with asl3)
    spermatocyte & spindle
    spindle & spermatocyte
    Orthologs
    Human Orthologs (via DIOPT v9.1)
    Species\Gene Symbol
    Score
    Best Score
    Best Reverse Score
    Alignment
    Complementation?
    Transgene?
    Homo sapiens (Human) (2)
    1 of 14
    Yes
    Yes
    1 of 14
    Yes
    No
    1  
    Model Organism Orthologs (via DIOPT v9.1)
    Species\Gene Symbol
    Score
    Best Score
    Best Reverse Score
    Alignment
    Complementation?
    Transgene?
    Rattus norvegicus (Norway rat) (1)
    1 of 14
    Yes
    No
    Mus musculus (laboratory mouse) (2)
    1 of 14
    Yes
    Yes
    1 of 14
    Yes
    No
    Xenopus tropicalis (Western clawed frog) (0)
    Danio rerio (Zebrafish) (2)
    1 of 14
    Yes
    Yes
    1 of 14
    Yes
    No
    Caenorhabditis elegans (Nematode, roundworm) (2)
    1 of 14
    Yes
    Yes
    1 of 14
    Yes
    No
    Anopheles gambiae (African malaria mosquito) (1)
    9 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:asl. Refer to their site for version information.
    Paralogs
    Paralogs (via DIOPT v9.1)
    Drosophila melanogaster (Fruit fly) (1)
    1 of 13
    Human Disease Associations
    FlyBase Human Disease Model Reports
    Disease Ontology (DO) Annotations
    Models Based on Experimental Evidence ( 1 )
    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
    Linkouts
    BioGRID - A database of protein and genetic interactions.
    DroID - A comprehensive database of gene and protein interactions.
    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
    3-47.5
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    83B4-83B5
    Limits computationally determined from genome sequence between P{PZ}Snr101319&P{PZ}Itp-r83A05616 and P{lacW}Atus1938
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    Experimentally Determined Recombination Data
    Notes

    Mapped halfway between st and cu.

    Stocks and Reagents
    Stocks (9)
    Genomic Clones (16)
     

    Please Note FlyBase no longer curates genomic clone accessions so this list may not be complete

    cDNA Clones (23)
     

    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
      Cell Line Information
      Publicly Available Cell Lines
       
        Other Stable Cell Lines
         
        • New stable cell line derived from S2-ThermoFischer : Centriolar proteins were tagged with GFP at either the N- or C- terminus and used to create stable S2 cell lines. S2 cell lines constitutively expressing the following constructs were created: asl-GFP, Sas-6-GFP, ana1-GFP, GFP-ana1, Cep135-GFP, ana3-GFP, Rcd4-GFP, ana2-GFP, GFP-asl.

        Other Comments

        asl protein is closely associated with the centriole wall, but is not part of the centriole structure.

        asl is required for centriole duplication.

        asl is involved in centriole duplication and is required for efficient recruitment of pericentriolar material.

        Expression is enriched in embryonic gonads.

        Identification: in a genetic screen for mutants defective in mechanosensation.

        Mutants have severe defects in mechanosensory transduction.

        asl is required for aster formation during male meiosis.

        Mutants are male sterile with no spindle aster in primary spermatocytes.

        Relationship to Other Genes
        Source for database merge of

        Source for merge of: asl CG2919

        Source for merge of: asl mecD

        Additional comments
        Nomenclature History
        Source for database identify of
        Nomenclature comments
        Etymology
        Synonyms and Secondary IDs (14)
        Reported As
        Symbol Synonym
        Secondary FlyBase IDs
        • FBgn0259895
        • FBgn0004916
        • FBgn0004830
        • FBgn0037348
        • FBgn0043878
        Datasets (0)
        Study focus (0)
        Experimental Role
        Project
        Project Type
        Title
        Study result (0)
        Result
        Result Type
        Title
        External Crossreferences and Linkouts ( 27 )
        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.
        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
        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
        Interactive Fly - A cyberspace guide to Drosophila development and metazoan evolution
        MIST (protein-protein) - An integrated Molecular Interaction Database
        References (197)