FB2025_01 , released February 20, 2025
Gene: Dmel\Sdc
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General Information
Symbol
Dmel\Sdc
Species
D. melanogaster
Name
Syndecan
Annotation Symbol
CG10497
Feature Type
FlyBase ID
FBgn0010415
Gene Model Status
Stock Availability
Gene Summary
Syndecan (Sdc) encodes a transmembrane heparan sulfate proteoglycan. It binds to the products of sli and robo1 to regulate axon guidance at the CNS midline, and it cooperates with the product of Lar to promote synapse growth at the larval neuromuscular junction. [Date last reviewed: 2019-03-14] (FlyBase Gene Snapshot)
Also Known As

l(2)10608, CT27296, dSdc, Dsyndecan

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
2-95
RefSeq locus
NT_033778 REGION:21392402..21481176
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (12 terms)
Molecular Function (0 terms)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (0 terms)
Biological Process (6 terms)
Terms Based on Experimental Evidence (5 terms)
CV Term
Evidence
References
inferred from mutant phenotype
inferred from mutant phenotype
inferred from mutant phenotype
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
involved_in cell migration
inferred from biological aspect of ancestor with PANTHER:PTN000099415
Cellular Component (6 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
located_in axon
inferred from direct assay
inferred from mutant phenotype
inferred from direct assay
inferred from high throughput direct assay
located_in synapse
inferred from direct assay
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
is_active_in cell surface
inferred from biological aspect of ancestor with PANTHER:PTN000099415
located_in membrane
inferred from electronic annotation with InterPro:IPR001050
Gene Group (FlyBase)
Protein Family (UniProt)
Belongs to the syndecan proteoglycan family. (P49415)
Summaries
Gene Snapshot
Syndecan (Sdc) encodes a transmembrane heparan sulfate proteoglycan. It binds to the products of sli and robo1 to regulate axon guidance at the CNS midline, and it cooperates with the product of Lar to promote synapse growth at the larval neuromuscular junction. [Date last reviewed: 2019-03-14]
Gene Group (FlyBase)
GLYPICANS -
Glypicans are glycosylphosphatidylinositol (GPI) anchored heparan sulfate proteoglycans. Glypicans can bind growth factors and morphogens, regulating their extracellular distribution. (Adapted from FBrf0138451).
Protein Function (UniProtKB)
Cell surface proteoglycan that bears heparan sulfate. Required for axonal and myotube guidance, is a necessary component of slit/robo signaling and is required in the slit target cells.
(UniProt, P49415)
Summary (Interactive Fly)

a heparan sulfate proteoglycan - a necessary component of Slit/Robo signaling required in Slit target cells - a crucial regulator of synapse development and growth

Gene Model and Products
Number of Transcripts
9
Number of Unique Polypeptides
9

Please see the JBrowse view of Dmel\Sdc 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 P49415)

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

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

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

Gene model reviewed during 5.51

Stop-codon suppression (UGA) postulated; FBrf0234051.

Gene model reviewed during 6.25

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0071706
2482
399
FBtr0071707
1985
226
FBtr0273206
1869
398
FBtr0305897
2944
75
FBtr0342892
2245
266
FBtr0342893
3982
494
FBtr0342894
2770
495
FBtr0342895
3466
322
FBtr0474169
2482
408
Additional Transcript Data and Comments
Reported size (kB)

3.9, 2.3 (northern blot)

Comments
External Data
Crossreferences
Polypeptide Data
Annotated Polypeptides
Name
FlyBase ID
Predicted MW (kDa)
Length (aa)
Theoretical pI
UniProt
RefSeq ID
GenBank
FBpp0071623
42.1
399
4.05
FBpp0071624
24.0
226
4.82
FBpp0271714
42.0
398
4.05
FBpp0309694
52.2
494
4.21
FBpp0309695
52.3
495
4.21
FBpp0309696
34.2
322
5.68
FBpp0423168
43.1
408
4.08
Polypeptides with Identical Sequences

None of the polypeptides share 100% sequence identity.

Additional Polypeptide Data and Comments
Reported size (kDa)

395 (aa); 39 (kD predicted)

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

Click to get a list of regulatory features (enhancers, TFBS, etc.) and gene disruptions (point mutations, indels, etc.) within or overlapping Dmel\Sdc 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).

-0.83

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

Comment: maternally deposited

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

Comment: reference states 7-15 hr AEL

Additional Descriptive Data

Sdc is expressed broadly in embryos but is enriched in the mesoderm during gastrulation and in cardial cells during germ band retraction.

Sdc is expressed in the mesoderm, the tracheal system, the axons of the CNS, in segment border cells, and in the differentiated apodemes.

The 3.9kb Sdc transcript is detected in 7-15hr embryos (only stage tested).

The 2.3kb Sdc transcript is a minor transcript detected in 7-15hr embryos (only stage tested).

Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
No Assay Recorded
Stage
Tissue/Position (including subcellular localization)
Reference
immunolocalization
Stage
Tissue/Position (including subcellular localization)
Reference
larval anterior commissure

Comment: reference states 13-16 hr AEL

embryonic/larval midgut

Comment: reference states 13-16 hr AEL

embryonic/larval pharynx

Comment: reference states 13-16 hr AEL

embryonic/larval lymph gland

Comment: reference states 13-16 hr AEL

peripheral nervous system

Comment: reference states 13-16 hr AEL

larval posterior commissure

Comment: reference states 13-16 hr AEL

ventral midline of embryo

Comment: reference states 13-16 hr AEL

mass spectroscopy
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data

At the larval neuromuscular junction, Sdc protein shows a punctate expression pattern strongly concentrated in a halo-like array around the presynaptic membrane.

also expressed at muscle insertions sites of embryonic CNS in stage 16 embryos

In 13-16hr embryos, Sdc protein is prominant in the lymph glands, in the peripheral and central nervous systems, and along the basal surfaces of the gut epithelia. In the central nervous system, it is found in the commissures and longitudinal connectives and along the midline.

Marker for
 
Subcellular Localization
CV Term
Evidence
References
located_in axon
inferred from direct assay
inferred from mutant phenotype
inferred from direct assay
inferred from high throughput direct assay
located_in synapse
inferred from direct assay
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\Sdc 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) 4-6
  • Stages(s) 7-8
  • Stages(s) 9-10
  • Stages(s) 11-12
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 62 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 27 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Sdc
Transgenic constructs containing regulatory region of Sdc
Aberrations (Deficiencies and Duplications) ( 8 )
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
anterior fascicle & axon | ectopic
eye photoreceptor cell & axon (with Sdc48)
eye photoreceptor cell & axon (with Sdc10608)
Orthologs
Human Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Homo sapiens (Human) (4)
6 of 14
Yes
Yes
5 of 14
No
Yes
5 of 14
No
Yes
 
3  
5 of 14
No
Yes
Model Organism Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Rattus norvegicus (Norway rat) (4)
7 of 14
Yes
Yes
6 of 14
No
Yes
6 of 14
No
Yes
5 of 14
No
Yes
Mus musculus (laboratory mouse) (4)
6 of 14
Yes
Yes
6 of 14
Yes
Yes
5 of 14
No
Yes
5 of 14
No
Yes
Xenopus tropicalis (Western clawed frog) (3)
5 of 13
Yes
Yes
3 of 13
No
Yes
2 of 13
No
Yes
Danio rerio (Zebrafish) (3)
6 of 14
Yes
Yes
5 of 14
No
Yes
5 of 14
No
Yes
Caenorhabditis elegans (Nematode, roundworm) (1)
8 of 14
Yes
Yes
Anopheles gambiae (African malaria mosquito) (1)
8 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:Sdc. 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 ( 1 )
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.
Dmel gene
Ortholog showing functional complementation
Supporting References
Interactions
Summary of Physical Interactions
Summary of Genetic Interactions
esyN Network Diagram
Show/hide secondary interactors 
(data from AllianceMine provided by esyN)
esyN Network Key:
Suppression
Enhancement
Other 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
Class of Gene
Genomic Location and Detailed Mapping Data
Chromosome (arm)
2R
Recombination map
2-95
Cytogenetic map
Sequence location
FlyBase Computed Cytological Location
Cytogenetic map
Evidence for location
57E1-57E6
Limits computationally determined from genome sequence between P{PZ}tmx1&P{EP}MESK2EP2347 and P{PZ}Egfr05351
Experimentally Determined Cytological Location
Cytogenetic map
Notes
References
57E1-57E2
(determined by in situ hybridisation)
Experimentally Determined Recombination Data
Location
Left of (cM)
Right of (cM)
Notes
Stocks and Reagents
Stocks (25)
Genomic Clones (64)
cDNA Clones (140)
 

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

        Mutant embryos show defects in midline axon guidance in the central nervous system.

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

        Sdc gene product is a heparan sulfate proteoglycan expressed at the cell surface. The single Sdc gene product is expressed in embryonic tissues equivalent to mammalian tissues that express distinct members of the syndecan family.

        Relationship to Other Genes
        Source for database merge of

        Source for merge of: Sdc l(2)10608

        Additional comments
        Nomenclature History
        Source for database identify of
        Nomenclature comments
        Etymology
        Synonyms and Secondary IDs (15)
        Reported As
        Symbol Synonym
        Syd
        Secondary FlyBase IDs
        • FBgn0010667
        Datasets (0)
        Study focus (0)
        Experimental Role
        Project
        Project Type
        Title
        Study result (0)
        Result
        Result Type
        Title
        External Crossreferences and Linkouts ( 107 )
        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 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
        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
        FlyMet - A comprehensive tissue-specific metabolomics resource for Drosophila.
        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
        Reactome Metabolic Pathways - An open-source, open access, manually curated and peer-reviewed metabolic pathway database.
        References (204)