FB2026_02 , released June 18, 2026
FB2026_02 , released June 18, 2026
Gene: Dmel\bgcn
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General Information
Symbol
Dmel\bgcn
Species
D. melanogaster
Name
benign gonial cell neoplasm
Annotation Symbol
CG30170
Feature Type
FlyBase ID
FBgn0004581
Gene Model Status
Stock Availability
Gene Summary
benign gonial cell neoplasm (bgcn) encodes an RNA-binding protein involved in germline stem cell lineage differentiation. It forms a translational repressor complex with the product of bam in ovaries and with the products of bam and tut in testis. [Date last reviewed: 2019-03-07] (FlyBase Gene Snapshot)
Also Known As

b(2)gcn, PNBP, pep

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
2-105
RefSeq locus
NT_033778 REGION:23853270..23858921
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (8 terms)
Molecular Function (2 terms)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
NOT enables helicase activity
inferred from key residues
Biological Process (6 terms)
Terms Based on Experimental Evidence (5 terms)
CV Term
Evidence
References
inferred from mutant phenotype
inferred from direct assay
inferred from mutant phenotype
inferred from mutant phenotype
involved_in oogenesis
inferred from high throughput mutant phenotype
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
traceable author statement
Cellular Component (0 terms)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (0 terms)
Gene Group (FlyBase)
Protein Family (UniProt)
-
Summaries
Gene Snapshot
benign gonial cell neoplasm (bgcn) encodes an RNA-binding protein involved in germline stem cell lineage differentiation. It forms a translational repressor complex with the product of bam in ovaries and with the products of bam and tut in testis. [Date last reviewed: 2019-03-07]
Gene Group (FlyBase)
UNCLASSIFIED PSEUDOENZYMES -
This group comprises pseudoenzymes that do not classify under other groups in FlyBase.
Protein Function (UniProtKB)
Forms a complex with tut and bam involved in 3'UTR-dependent post-transcriptional repression of several 3'-RNA processing factors, which promotes germline stem cell lineage differentiation and mitosis-to-meiosis transition (PubMed:25412508, PubMed:28190776). Part of a complex with bam involved in 3'-UTR-dependent translational repression of a subset of mRNAs, including those for mei-P26, nanos and shg/E-cadherin; may act as a promiscuous RNA-binding protein tethering bam to its target mRNAs (PubMed:19470484, PubMed:19556547, PubMed:23122292, PubMed:23526974). Required for regulating the progression of gonialblast cells through transit amplification and differentiation into gametes (PubMed:9334284).
(UniProt, Q9W1I2)
Phenotypic Description (Red Book; Lindsley and Zimm 1992)
bgcn: benign gonial cell neoplasm
Gametocyte differentiation defective; gonial proliferation unchecked; gonads of both males and females become engorged with gonial cells. Ovarioles appear sausage like; testes smaller than normal. Autonomous in transplants of young adult ovaries and testes into body cavity of wild-type females.
pep: peppercorn (T. Schupbach)
Female sterile; homozygous females contain many small egg chambers in their ovaries, which seem blocked in early stages of oogenesis. Follicle cells nevertheless synthesize a very small, round chorion around these egg chambers, giving them the appearance of small round peppercorns.
Summary (Interactive Fly)

cofactor of Bag of marbles that directly inhibits Pumilio repression of Nanos mRNA activity to promote differentiation of germ line stem cells

Gene Model and Products
Number of Transcripts
2
Number of Unique Polypeptides
2

Please see the JBrowse view of Dmel\bgcn 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 Q9W1I2)

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 5.52

Gene model reviewed during 5.56

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0072232
4159
1215
FBtr0344878
4144
1210
Additional Transcript Data and Comments
Reported size (kB)

4.1 (northern blot)

Comments
External Data
Crossreferences
Polypeptide Data
Annotated Polypeptides
Name
FlyBase ID
Predicted MW (kDa)
Length (aa)
Theoretical pI
UniProt
RefSeq ID
GenBank
FBpp0072141
139.3
1215
7.15
Polypeptides with Identical Sequences

None of the polypeptides share 100% sequence identity.

Additional Polypeptide Data and Comments
Reported size (kDa)

1215 (aa); 139 (kD)

Comments
External Data
Subunit Structure (UniProtKB)

Part of a complex composed of at least mei-P26, bam, bgcn and Sxl; this complex is involved in translational repression of nanos mRNA (PubMed:23526974). Interacts with bam (via C-terminus); the interaction is direct (PubMed:19470484, PubMed:19556547, PubMed:23122292, PubMed:23526974, PubMed:25412508). Interacts with mei-P26; the interaction is direct and does not require bam (PubMed:23526974). Weakly interacts with wh/wuho; this interaction may be required for the function or formation of the mei-P26-bgcn-bam-Sxl complex (PubMed:31941704). Part of a complex composed of at least tut, bam and bgcn; complex formation does not require RNA (PubMed:25412508). Interacts with tut; the interaction is indirect and is mediated by bam (PubMed:25412508). As part of the bam-bgcn-tut complex associates with twin; may recruit the CCR4-NOT1 deadenylation complex to mRNA 3'UTRs to mediate post-transcriptional regulation of expression (PubMed:28190776).

(UniProt, Q9W1I2)
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\bgcn 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).

3.79

Transcript Expression
in situ
Stage
Tissue/Position (including subcellular localization)
Reference
northern blot
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data

bgcn transcripts are abundant in males and very rare in females. By in sity hybridization, they are detected in 5-8 cells at the tip of the germarium. The expression occurs in the germline stem cells, the cystoblasts, and perhaps very young cystocytes.

Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
mass spectroscopy
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Evidence
References
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\bgcn 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) 13-16
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 17 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 8 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of bgcn
Transgenic constructs containing regulatory region of bgcn
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
Orthologs
Human Orthologs (via DIOPT v9.1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
Homo sapiens (Human) (19)
4 of 14
Yes
No
2 of 14
No
No
2 of 14
No
No
4  
2 of 14
No
No
1  
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
1  
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
1  
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 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) (18)
5 of 14
Yes
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
Mus musculus (laboratory mouse) (19)
5 of 14
Yes
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
Xenopus tropicalis (Western clawed frog) (15)
3 of 13
Yes
No
2 of 13
No
No
2 of 13
No
Yes
1 of 13
No
Yes
1 of 13
No
No
1 of 13
No
No
1 of 13
No
No
1 of 13
No
No
1 of 13
No
No
1 of 13
No
No
1 of 13
No
No
1 of 13
No
Yes
1 of 13
No
No
1 of 13
No
No
1 of 13
No
Yes
Danio rerio (Zebrafish) (16)
4 of 14
Yes
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
Caenorhabditis elegans (Nematode, roundworm) (11)
4 of 14
Yes
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
2 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
1 of 14
No
No
Anopheles gambiae (African malaria mosquito) (14)
2 of 12
No
No
Arabidopsis thaliana (thale-cress) (23)
3 of 13
Yes
No
3 of 13
Yes
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
Yes
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
2 of 13
No
Yes
2 of 13
No
No
2 of 13
No
No
2 of 13
No
No
1 of 13
No
No
1 of 13
No
No
1 of 13
No
No
Saccharomyces cerevisiae (Brewer's yeast) (7)
2 of 13
Yes
No
2 of 13
Yes
No
2 of 13
Yes
No
2 of 13
Yes
No
2 of 13
Yes
No
2 of 13
Yes
No
1 of 13
No
No
Schizosaccharomyces pombe (Fission yeast) (9)
2 of 12
Yes
No
2 of 12
Yes
No
2 of 12
Yes
No
2 of 12
Yes
No
2 of 12
Yes
No
1 of 12
No
No
1 of 12
No
No
1 of 12
No
No
1 of 12
No
No
Escherichia coli (enterobacterium) (2)
1 of 11
Yes
No
1 of 11
Yes
No
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:bgcn. Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Drosophila melanogaster (Fruit fly) (13)
3 of 13
2 of 13
2 of 13
2 of 13
2 of 13
2 of 13
2 of 13
2 of 13
2 of 13
2 of 13
2 of 13
2 of 13
1 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 ( 2 )
    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
    RNA-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)
    Part of a complex composed of at least mei-P26, bam, bgcn and Sxl; this complex is involved in translational repression of nanos mRNA (PubMed:23526974). Interacts with bam (via C-terminus); the interaction is direct (PubMed:19470484, PubMed:19556547, PubMed:23122292, PubMed:23526974, PubMed:25412508). Interacts with mei-P26; the interaction is direct and does not require bam (PubMed:23526974). Weakly interacts with wh/wuho; this interaction may be required for the function or formation of the mei-P26-bgcn-bam-Sxl complex (PubMed:31941704). Part of a complex composed of at least tut, bam and bgcn; complex formation does not require RNA (PubMed:25412508). Interacts with tut; the interaction is indirect and is mediated by bam (PubMed:25412508). As part of the bam-bgcn-tut complex associates with twin; may recruit the CCR4-NOT1 deadenylation complex to mRNA 3'UTRs to mediate post-transcriptional regulation of expression (PubMed:28190776).
    (UniProt, Q9W1I2 )
    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)
    2R
    Recombination map
    2-105
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    60A4-60A4
    Limits computationally determined from genome sequence between P{lacW}eIF6k13214 and P{lacW}kenk11035&P{EP}CG17658EP730
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    60A-60A
    (determined by in situ hybridisation)
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Notes
    Stocks and Reagents
    Stocks (15)
    Genomic Clones (20)
    cDNA Clones (1)
     

    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
        Other 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

              bgcn is essential for the localization of bam protein to the fusome.

              bam and bgcn cooperatively regulate cystoblast differentiation by controlling localization of bam protein to the fusome.

              Germ cells lacking bgcn become trapped in a stem cell-like state.

              Mosaic analysis demonstrates bam and bgcn act autonomously in the germline to restrict germ cell proliferation during spermatogenesis. Results suggest bam and bgcn regulate progression through the male germline stem cell lineage by cell-intrinsically restricting the proliferation of amplifying germ cells. bgcn function is not required for the proper expression of bam protein.

              Germ cells accumulating in bam or bgcn mutants testis most resemble amplifying germ cells, because they undergo incomplete cytokinesis and progress through the cell cycle in synchrony within a cyst.

              Mutants display germline hyperplastic phenotype.

              The bgcn locus affects early oogenesis: mutations cause the production of few, defective germ cells.

              Relationship to Other Genes
              Source for database merge of

              Source for merge of: bgcn CG10331

              Source for merge of: bgcn PNBP

              Additional comments

              Source for merge of bgcn CG10331 was sequence comparison ( date:000815 ).

              Nomenclature History
              Source for database identify of
              Nomenclature comments
              Etymology
              Synonyms and Secondary IDs (25)
              Reported As
              Symbol Synonym
              b(2)cgn
              ben(2)gcn
              cg10331
              fs(2)eo-C
              fs(2)eo6
              fs(2)eoQS2
              gcn
              Secondary FlyBase IDs
              • FBgn0000965
              • FBgn0001096
              • FBgn0003066
              • FBgn0026784
              • FBgn0034917
              • FBgn0050170
              Datasets (0)
              Study focus (0)
              Experimental Role
              Project
              Project Type
              Title
              Study result (0)
              Result
              Result Type
              Title
              External Crossreferences and Linkouts ( 100 )
              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
              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 (genetic) - An integrated Molecular Interaction Database
              MIST (protein-protein) - An integrated Molecular Interaction Database
              References (187)