FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Gene: Dmel\Dhod
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General Information
Symbol
Dmel\Dhod
Species
D. melanogaster
Name
Dihydroorotate dehydrogenase
Annotation Symbol
CG9741
Feature Type
FlyBase ID
FBgn0000447
Gene Model Status
Stock Availability
Enzyme Name (EC)
dihydroorotate dehydrogenase (quinone) (1.3.5.2)
Gene Summary
Dihydroorotate dehydrogenase (Dhod) encodes a protein that is associated with the inner mitochondrial membrane. It catalyzes the fourth step of de novo pyrimidine biosynthesis, which is required for normal cuticle formation and oogenesis. [Date last reviewed: 2019-03-07] (FlyBase Gene Snapshot)
Also Known As

DHODH, l(3)s3512

Key Links
Genomic Location
Cytogenetic map
Sequence location
Recombination map
3-48
RefSeq locus
NT_033777 REGION:8651391..8652916
Sequence
Genomic Maps
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
Gene Ontology (GO) Annotations (9 terms)
Molecular Function (3 terms)
Terms Based on Experimental Evidence (2 terms)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (3 terms)
CV Term
Evidence
References
Biological Process (2 terms)
Terms Based on Experimental Evidence (0 terms)
Terms Based on Predictions or Assertions (2 terms)
CV Term
Evidence
References
inferred from sequence or structural similarity with UniProtKB:Q63707
inferred from electronic annotation with InterPro:IPR001295, InterPro:IPR005719
inferred from biological aspect of ancestor with PANTHER:PTN000234184
Cellular Component (4 terms)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
inferred from direct assay
Terms Based on Predictions or Assertions (3 terms)
CV Term
Evidence
References
located_in cytoplasm
inferred from electronic annotation with InterPro:IPR005720
located_in membrane
inferred from electronic annotation with InterPro:IPR005719
inferred from biological aspect of ancestor with PANTHER:PTN000234186
Gene Group (FlyBase)
Protein Family (UniProt)
Belongs to the dihydroorotate dehydrogenase family. Type 2 subfamily. (P32748)
Catalytic Activity (EC/Rhea)
dihydroorotate dehydrogenase (quinone) activity
(S)-dihydroorotate + a quinone = orotate + a quinol (1.3.5.2)
RHEA 30187: dihydroorotate dehydrogenase activity
RHEA 18073:
Summaries
Gene Snapshot
Dihydroorotate dehydrogenase (Dhod) encodes a protein that is associated with the inner mitochondrial membrane. It catalyzes the fourth step of de novo pyrimidine biosynthesis, which is required for normal cuticle formation and oogenesis. [Date last reviewed: 2019-03-07]
Gene Group (FlyBase)
DIHYDROOROTATE DEHYDROGENASES -
Dihydroorotate dehydrogenases catalyze the fourth step of de novo pyrimidine biosynthesis. In animals, it is an integral flavoprotein of the inner mitochondrial membrane and is functionally connected to the respiratory chain. (Adapted from FBrf0152076.)
Protein Function (UniProtKB)
Catalyzes the conversion of dihydroorotate to orotate with quinone as electron acceptor.
(UniProt, P32748)
Phenotypic Description (Red Book; Lindsley and Zimm 1992)
Dhod: Dihydroorotate dehydrogenase
Likely to be the structural gene for dehydroorotate dehydrogenase, which catalyzes the fourth enzymatic step of de novo pyrimidine biosynthesis [DHOdehase (EC 1.3.3.1)]. Homozygotes for null alleles display less than 3% normal levels of enzyme activity; heterozygotes have half-normal levels; flies with three normal alleles show increased levels. Enzyme appears to be monomeric; no interallelic complementation among null alleles. Enzyme activity located in outer surface of inner mitochondrial membrane in other species; also mitochondrial in Drosophila. Homozygotes for null alleles exhibit wing truncation, irregular lengths and distribution of hairs on wing margin, deformed posterior legs, and female sterility, as seen in r and r-l. Viability normal. Phenotype suppressed, but enzyme level not restored, by su(r). Null mutants suppress eye mottling characteristic of r-l in doubly mutant genotypes.
Gene Model and Products
Number of Transcripts
2
Number of Unique Polypeptides
1

Please see the JBrowse view of Dmel\Dhod 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 P32748)

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 5.43

Gene model reviewed during 5.47

Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0081890
1355
405
FBtr0300442
1472
405
Additional Transcript Data and Comments
Reported size (kB)

1.3 (northern blot, longest cDNA)

1.6, 1.5 (northern blot)

Comments
External Data
Crossreferences
Polypeptide Data
Annotated Polypeptides
Name
FlyBase ID
Predicted MW (kDa)
Length (aa)
Theoretical pI
UniProt
RefSeq ID
GenBank
FBpp0081376
44.3
405
9.73
FBpp0289671
44.3
405
9.73
Polypeptides with Identical Sequences

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

405 aa isoforms: Dhod-PA, Dhod-PD
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\Dhod 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).

4.79

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

The 1.5 kb Dhod transcript is most abundant in early embryos, and least abundant in mid-larval stages. It is present in intermediate amounts in mid-embryonic and mid-pupal stages, and in adult flies of both sexes.

Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
enzyme assay or biochemical detection
Stage
Tissue/Position (including subcellular localization)
Reference
mass spectroscopy
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data

Using an enzyme assay, Dhod protein activity is demonstrated in elongated spermatid bundles, but is absent from earlier and later stages.

Marker for
 
Subcellular Localization
CV Term
Evidence
References
inferred from direct assay
Expression Deduced from Reporters
Reporter: P{ds1}
Stage
Tissue/Position (including subcellular localization)
Reference
Reporter: P{ds1Δ947}
Stage
Tissue/Position (including subcellular localization)
Reference
Reporter: P{ds1Δ975}
Stage
Tissue/Position (including subcellular localization)
Reference
Reporter: P{ds1ΔBH}
Stage
Tissue/Position (including subcellular localization)
Reference
Reporter: P{ds1ΔCH}
Stage
Tissue/Position (including subcellular localization)
Reference
High-Throughput Expression Data
Associated Tools

JBrowse - Visual display of RNA-Seq signals

View Dmel\Dhod 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 ( 28 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 14 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Dhod
Transgenic constructs containing regulatory region of Dhod
Aberrations (Deficiencies and Duplications) ( 24 )
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) (2)
14 of 14
Yes
Yes
2 of 14
No
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) (2)
14 of 14
Yes
Yes
1 of 14
No
No
Mus musculus (laboratory mouse) (2)
12 of 14
Yes
Yes
2 of 14
No
No
Xenopus tropicalis (Western clawed frog) (1)
11 of 13
Yes
Yes
Danio rerio (Zebrafish) (3)
14 of 14
Yes
Yes
2 of 14
No
No
1 of 14
No
No
Caenorhabditis elegans (Nematode, roundworm) (2)
14 of 14
Yes
Yes
2 of 14
No
No
Anopheles gambiae (African malaria mosquito) (2)
12 of 12
Yes
Yes
Arabidopsis thaliana (thale-cress) (2)
13 of 13
Yes
Yes
4 of 13
No
No
Saccharomyces cerevisiae (Brewer's yeast) (1)
9 of 13
Yes
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
12 of 12
Yes
Yes
Escherichia coli (enterobacterium) (2)
10 of 11
Yes
Yes
2 of 11
No
No
Other Organism Orthologs (via OrthoDB)
Data provided directly from OrthoDB:Dhod. Refer to their site for version information.
Paralogs
Paralogs (via DIOPT v9.1)
Drosophila melanogaster (Fruit fly) (3)
2 of 13
1 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 ( 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.
    Interactions
    Summary of Physical Interactions
    Interaction Browsers
    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
    KEGG Metabolic Pathways - A collection of manually drawn metabolic pathway maps representing knowledge of molecular interaction, reaction and relation networks.
    Reactome Metabolic Pathways - An open-source, open access, manually curated and peer-reviewed metabolic pathway database.
    External Data
    Linkouts
    KEGG Pathways - A collection of manually drawn pathway maps representing knowledge of molecular interaction, reaction and relation networks.
    Reactome - An open-source, open access, manually curated and peer-reviewed pathway database.
    Class of Gene
    Genomic Location and Detailed Mapping Data
    Chromosome (arm)
    3R
    Recombination map
    3-48
    Cytogenetic map
    Sequence location
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    85A5-85A5
    Limits computationally determined from genome sequence between P{EP}EP833 and P{lacW}l(3)L4740L4740
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    85A5-85A7
    (determined by in situ hybridisation)
    Experimentally Determined Recombination Data
    Location

    3-48.0

    Left of (cM)
    Right of (cM)
    Notes

    No recombinants with pp among 11,618 offspring of heterozygous mothers.

    Stocks and Reagents
    Stocks (13)
    Genomic Clones (16)
     

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

    cDNA Clones (55)
     

    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

        In a sample of 79 genes with multiple introns, 33 showed significant heterogeneity in G+C content among introns of the same gene and significant positive correspondence between the intron and the third codon position G+C content within genes. These results are consistent with selection adding against preferred codons at the start of genes.

        A novel class of Dhod RNA of approximately 1.6kb is relatively abundant in adult males. Expression of a male specific promoter is limited to spermatogenic cells. This RNA is subject to a translational delay system operative during spermatogenesis.

        Structural organisation, embryonic transcript and protein product of Dhod are characterised.

        The location of the Dhod gene within 85A has been determined by mapping two rearrangement mutations. A cDNA clone has been isolated and the developmental expression of the Dhod transcript has been studied.

        Dhod was involved in a complementation analysis of the 85A region.

        Likely to be the structural gene for dehydroorotate dehydrogenase, which catalyzes the fourth enzymatic step of de novo pyrimidine biosynthesis (DHOdehase). Homozygotes for null alleles display less than 3% normal levels of enzyme activity; heterozygotes have half-normal levels; flies with three normal alleles show increased levels. Enzyme appears to be monomeric; no interallelic complementation among null alleles. Enzyme activity located in outer surface of inner mitochondrial membrane in other species; also mitochondrial in Drosophila. Homozygotes for null alleles exhibit wing truncation, irregular lengths and distribution of hairs on wing margin, deformed posterior legs and female sterility, as seen in r and r-l. Viability normal. Phenotype suppressed, but enzyme level not restored, by su(r). Null mutants suppress eye mottling characteristic of r-l in doubly mutant genotypes.

        Relationship to Other Genes
        Source for database merge of

        Source for merge of: Dhod l(3)s3512

        Additional comments
        Nomenclature History
        Source for database identify of

        Source for identity of: Dhod CG9741

        Nomenclature comments
        Etymology
        Synonyms and Secondary IDs (8)
        Datasets (0)
        Study focus (0)
        Experimental Role
        Project
        Project Type
        Title
        Study result (0)
        Result
        Result Type
        Title
        External Crossreferences and Linkouts ( 63 )
        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
        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
        FlyMet - A comprehensive tissue-specific metabolomics resource for Drosophila.
        iBeetle-Base - RNAi phenotypes in the red flour beetle (Tribolium castaneum)
        KEGG Metabolic Pathways - A collection of manually drawn metabolic pathway maps representing knowledge of molecular interaction, reaction and relation networks.
        KEGG Pathways - A collection of manually drawn pathway maps representing knowledge of molecular interaction, reaction and relation networks.
        MIST (protein-protein) - An integrated Molecular Interaction Database
        Reactome - An open-source, open access, manually curated and peer-reviewed pathway database.
        Reactome Metabolic Pathways - An open-source, open access, manually curated and peer-reviewed metabolic pathway database.
        References (73)