FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\Tomosyn
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General Information
Symbol
Dmel\Tomosyn
Species
D. melanogaster
Name
Tomosyn
Annotation Symbol
CG17762
Feature Type
FlyBase ID
FBgn0030412
Gene Model Status
Stock Availability
Gene Summary
Tomosyn (Tomosyn) encodes a protein involved in long-term memory and neuromuscular synaptic transmission. [Date last reviewed: 2019-09-19] (FlyBase Gene Snapshot)
Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
1-39
RefSeq locus
NC_004354 REGION:12631605..12653442
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (11 terms)
Molecular Function (4 terms)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (4 terms)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000028271
inferred from biological aspect of ancestor with PANTHER:PTN000028271
inferred from sequence or structural similarity with SGD:S000006236
inferred from biological aspect of ancestor with PANTHER:PTN000028271
Biological Process (4 terms)
Terms Based on Experimental Evidence (2 terms)
CV Term
Evidence
References
involved_in long-term memory
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
involved_in exocytosis
inferred from biological aspect of ancestor with PANTHER:PTN000028271
inferred from sequence or structural similarity with SGD:S000006236
inferred from biological aspect of ancestor with PANTHER:PTN000028271
inferred from sequence or structural similarity with SGD:S000006236
Cellular Component (3 terms)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
inferred from direct assay
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
is_active_in cytoplasm
inferred from biological aspect of ancestor with PANTHER:PTN000028271
is_active_in plasma membrane
inferred from biological aspect of ancestor with PANTHER:PTN000028271
Gene Group (FlyBase)
Protein Family (UniProt)
-
Summaries
Gene Snapshot
Tomosyn (Tomosyn) encodes a protein involved in long-term memory and neuromuscular synaptic transmission. [Date last reviewed: 2019-09-19]
Summary (Interactive Fly)

neuromuscular junction - SNARE binding protein - potently inhibits exocytosis by sequestering SNARE proteins in nonfusogenic complexes - a decoy snare - enables tonic release in Ib motoneurons by reducing SNARE complex formation and suppressing probability of release to generate decreased levels of synaptic vesicle fusion and enhanced resistance to synaptic fatigue - involved in a specific component of late associative memory

Gene Model and Products
Number of Transcripts
7
Number of Unique Polypeptides
3

Please see the JBrowse view of Dmel\Tomosyn 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 Q9VYK6)

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 5.50

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

Annotated transcripts do not represent all supported alternative splices within 5' UTR.

Annotated transcripts do not represent all possible combinations of alternative exons and/or alternative promoters.

Gene model reviewed during 5.55

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0073678
5490
1470
FBtr0300375
5290
1470
FBtr0307898
4541
1254
FBtr0307899
5330
1470
FBtr0307900
4687
1254
FBtr0340406
5041
1387
FBtr0340407
5062
1387
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
FBpp0073511
158.5
1470
7.05
FBpp0289604
158.5
1470
7.05
FBpp0300332
136.5
1254
6.85
FBpp0300333
158.5
1470
7.05
FBpp0300334
136.5
1254
6.85
FBpp0309352
149.8
1387
6.86
FBpp0309353
149.8
1387
6.86
Polypeptides with Identical Sequences

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

1470 aa isoforms: Tomosyn-PC, Tomosyn-PF, Tomosyn-PI
1387 aa isoforms: Tomosyn-PK, Tomosyn-PL
1254 aa isoforms: Tomosyn-PH, Tomosyn-PJ
Additional Polypeptide Data and Comments
Reported size (kDa)
Comments
External Data
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\Tomosyn 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).

-1.04

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

Comment: maternally deposited

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

Tomosyn is primarily expressed presynaptically at the neuromuscular junction.

Marker for
 
Subcellular Localization
CV Term
Evidence
References
inferred from direct assay
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\Tomosyn 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
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 10 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 12 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Tomosyn
Transgenic constructs containing regulatory region of Tomosyn
Aberrations (Deficiencies and Duplications) ( 0 )
Variants
Variant Molecular Consequences
Alleles Representing Disease-Implicated Variants
Phenotypes
Orthologs
Human Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Homo sapiens (Human) (6)
14 of 14
Yes
Yes
1  
13 of 14
No
Yes
4 of 14
No
No
1  
4 of 14
No
No
1 of 14
No
No
1 of 14
No
No
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Rattus norvegicus (Norway rat) (6)
14 of 14
Yes
Yes
13 of 14
No
Yes
4 of 14
No
No
4 of 14
No
No
2 of 14
No
No
1 of 14
No
No
Mus musculus (laboratory mouse) (6)
13 of 14
Yes
Yes
13 of 14
Yes
Yes
4 of 14
No
No
4 of 14
No
No
2 of 14
No
Yes
1 of 14
No
No
Xenopus tropicalis (Western clawed frog) (6)
10 of 13
Yes
Yes
7 of 13
No
Yes
3 of 13
No
No
3 of 13
No
No
2 of 13
No
No
1 of 13
No
No
Danio rerio (Zebrafish) (9)
13 of 14
Yes
Yes
13 of 14
Yes
Yes
13 of 14
Yes
Yes
4 of 14
No
No
4 of 14
No
No
2 of 14
No
Yes
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
Caenorhabditis elegans (Nematode, roundworm) (2)
12 of 14
Yes
Yes
2 of 14
No
No
Anopheles gambiae (African malaria mosquito) (2)
11 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (2)
8 of 13
Yes
Yes
7 of 13
No
Yes
Saccharomyces cerevisiae (Brewer's yeast) (2)
6 of 13
Yes
Yes
6 of 13
Yes
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
3 of 12
Yes
Yes
Escherichia coli (enterobacterium) (0)
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:Tomosyn. Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Drosophila melanogaster (Fruit fly) (1)
7 of 13
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.
    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
    Summary of Genetic Interactions
    Interaction Browsers
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    External Data
    Linkouts
    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
    SignaLink - A signaling pathway resource with multi-layered regulatory networks.
    Class of Gene
    Genomic Location and Detailed Mapping Data
    Chromosome (arm)
    X
    Recombination map
    1-39
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    11B6-11B7
    Limits computationally determined from genome sequence between P{EP}CG11138EP1313 and P{EP}EP1632&P{EP}EP1449
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    Determined by comparing Celera genomic sequence with sequence from BDGP BAC and P1 clones.
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (10)
    Genomic Clones (19)
     
    cDNA Clones (53)
     

    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
       

      polyclonal

      Commercially Available Antibodies
       
      Cell Line Information
      Publicly Available Cell Lines
       
        Other Stable Cell Lines
         
          Other Comments

          dsRNA made from templates generated with primers directed against this gene tested in RNAi screen for effects on Kc167 and S2R+ cell morphology.

          Relationship to Other Genes
          Source for database merge of

          Source for merge of: tomosyn CG2205

          Source for merge of: tomosyn CG11056

          Source for merge of: tomosyn BcDNA:RH19475

          Additional comments

          mir-970 is located within tomosyn.

          Annotations CG17762 and CG11056, CG2205 merged as CG17762 in release 3 of the genome annotation.

          Source for merge of tomosyn CG2205 was a shared cDNA ( date:010720 ).

          Source for merge of tomosyn BcDNA:RH19475 was a shared cDNA ( date:030728 ).

          Nomenclature History
          Source for database identify of

          Source for identity of: tomosyn CG17762

          Nomenclature comments
          Etymology
          Synonyms and Secondary IDs (7)
          Datasets (0)
          Study focus (0)
          Experimental Role
          Project
          Project Type
          Title
          Study result (0)
          Result
          Result Type
          Title
          External Crossreferences and Linkouts ( 76 )
          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
          KEGG Genes - Molecular building blocks of life in the genomic space.
          MARRVEL_MODEL - MARRVEL (model organism gene)
          Linkouts
          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 (protein-protein) - An integrated Molecular Interaction Database
          SignaLink - A signaling pathway resource with multi-layered regulatory networks.
          References (69)