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General Information
Symbol
Dmel\Orc2
Species
D. melanogaster
Name
Origin recognition complex subunit 2
Annotation Symbol
CG3041
Feature Type
FlyBase ID
FBgn0015270
Gene Model Status
Stock Availability
Gene Snapshot
Origin recognition complex subunit 2 (Orc2) encodes a subunit of the origin recognition complex (ORC), which is essential for the initiation of DNA replication in eukaryotic cells. The product of Orc2 can be phosphorylated by CK2 and Cdks in vivo and in vitro. [Date last reviewed: 2019-03-14]
Also Known As
DmORC2, k43, ORC, l(3)K43, l(3)88Ab
Key Links
Genomic Location
Cytogenetic map
Sequence location
3R:13,964,885..13,967,075 [+]
Recombination map
3-54
Sequence
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
GO Summary Ribbons
Gene Group (FlyBase)
Protein Family (UniProt)
Belongs to the ORC2 family. (Q24168)
Molecular Function (GO)
[Detailed GO annotations]
Experimental Evidence
Predictions / Assertions
Summaries
Gene Group (FlyBase)
ORIGIN RECOGNITION COMPLEX -
The Origin Recognition Complex (ORC) is a multi-subunit complex that binds replication origin during replication initiation. Many ORC subunits belong to the AAA+ superfamily of ATPases. (Adapted from FBrf0227879).
Protein Function (UniProtKB)
Component of the origin recognition complex (ORC) that binds origins of replication. DNA-binding is ATP-dependent, however specific DNA sequences that define origins of replication have not been identified so far. ORC is required to assemble the pre-replication complex necessary to initiate DNA replication.
(UniProt, Q24168)
Phenotypic Description (Red Book; Lindsley and Zimm 1992)
fs(3)293-19
Eggs of homozygous females defective in late-deposited outer layers of endochorion; endochorionic material deficient. Late-gene expression as measured by mRNA or protein levels defective; deficiency in the level of chorion-gene amplification in follicle cells.
l(3)88Ab
Homozygous larvae contain rudimentary imaginal discs, but disc primordia do not grow during larval development; testes and ovaries smaller than normal, and cell number in central nervous system reduced. Mutant gonads do not survive metamorphosis when implanted into wild-type larvae. Homozygous cuticular clones appear to develop normally, but abdominal clones reduced in frequency and size compared to control clones. Mutant larvae support growth of implanted wild-type discs. Normal gene product postulated to be required for cell proliferation; survival of somatic epidermal clones attributed to perdurance. Larval ganglia exhibit extremely low mitotic index; chromosomes irregularly condensed and chromosome breakage observed (Gatti and Baker, 1989, Genes Dev. 3: 438-53); salivary chromosomes appear normal.
Homozygous females weakly fertile; produce eggs with grossly defective chorions; thin, missing most appendages and permeable. All chorion proteins reduced in abundance; chorion gene amplification reduced to 10% wild-type level (Snyder, Galanopoulos, and Kafatos, l986, Proc. Nat. Acad. Sci. USA 83: 3341-45). Heterozygotes with lethal alleles more extreme and sterile.
Summary (Interactive Fly)
A subunit of the Origin recognition complex, involved in initiation of DNA replication - necessary at the interphase-to-mitosis transition to recruit cdc2 kinase and disassemble RPA foci.
Gene Model and Products
Number of Transcripts
1
Number of Unique Polypeptides
1

Please see the GBrowse view of Dmel\Orc2 or the JBrowse view of Dmel\Orc2 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
Comments on Gene Model
Low-frequency RNA-Seq exon junction(s) not annotated.
Gene model reviewed during 5.47
Sequence Ontology: Class of Gene
Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0082866
1995
618
Additional Transcript Data and Comments
Reported size (kB)
2.2 (northern blot)
2.5 (northern blot)
Comments
External Data
Crossreferences
Polypeptide Data
Annotated Polypeptides
Name
FlyBase ID
Predicted MW (kDa)
Length (aa)
Theoretical pI
RefSeq ID
GenBank
FBpp0082329
69.0
618
6.26
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)
618 (aa); 82 (kD observed)
Comments
External Data
Subunit Structure (UniProtKB)
ORC is composed of six subunits. Interacts with Mcm10.
(UniProt, Q24168)
Crossreferences
InterPro - A database of protein families, domains and functional sites
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\Orc2 using the Feature Mapper tool.

External Data
Crossreferences
Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
Linkouts
Gene Ontology (14 terms)
Molecular Function (2 terms)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
inferred from direct assay
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000362151
(assigned by GO_Central )
Biological Process (8 terms)
Terms Based on Experimental Evidence (7 terms)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (3 terms)
CV Term
Evidence
References
Cellular Component (4 terms)
Terms Based on Experimental Evidence (4 terms)
CV Term
Evidence
References
inferred from direct assay
inferred from direct assay
inferred from direct assay
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from sequence or structural similarity with SGD:S000000264
inferred from biological aspect of ancestor with PANTHER:PTN000362151
(assigned by GO_Central )
Expression Data
Expression Summary Ribbons
Colored tiles in ribbon indicate that expression data has been curated by FlyBase for that anatomical location. Colorless tiles indicate that there is no curated data for that location.
For complete stage-specific expression data, view the modENCODE Development RNA-Seq section under High-Throughput Expression below.
Transcript Expression
in situ
Stage
Tissue/Position (including subcellular localization)
Reference
organism

Comment: maternally deposited

antennal anlage

Comment: reported as procephalic ectoderm anlage

central brain anlage

Comment: reported as procephalic ectoderm anlage

dorsal head epidermis anlage

Comment: reported as procephalic ectoderm anlage

visual anlage

Comment: reported as procephalic ectoderm anlage

ventral nerve cord primordium

Comment: reported as ventral nerve cord anlage

antennal primordium

Comment: reported as procephalic ectoderm primordium

central brain primordium

Comment: reported as procephalic ectoderm primordium

visual primordium

Comment: reported as procephalic ectoderm primordium

dorsal head epidermis primordium

Comment: reported as procephalic ectoderm primordium

lateral head epidermis primordium

Comment: reported as procephalic ectoderm primordium

ventral head epidermis primordium

Comment: reported as procephalic ectoderm primordium

northern blot
Stage
Tissue/Position (including subcellular localization)
Reference
Additional Descriptive Data
Orc2 transcripts are maternally deposited and are abundant in early embryos. Levels taper off in later embryonic and larval stages.
Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
immunolocalization
Stage
Tissue/Position (including subcellular localization)
Reference
western blot
Stage
Tissue/Position (including subcellular localization)
Reference

Comment: reference states 0-4 hr AEL

Additional Descriptive Data
Orc2 protein is preferentially localized to heterochromatin on interphase and mitotic chromosomes.
Western blot analysis shows that Orc2 protein is most abundant in 0-4hr embryos.
Marker for
 
Subcellular Localization
CV Term
Evidence
References
inferred from direct assay
inferred from direct assay
inferred from direct assay
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

GBrowse - Visual display of RNA-Seq signals

View Dmel\Orc2 in GBrowse 2
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
FLIGHT - Cell culture data for RNAi and other high-throughput technologies
FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
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, and Transgenic Constructs
Classical and Insertion Alleles ( 19 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 10 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Orc2
Transgenic constructs containing regulatory region of Orc2
Deletions and Duplications ( 15 )
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
mitosis & nuclear chromosome
mitosis & nuclear chromosome (with Df(3R)293γ7)
mitosis & nuclear chromosome (with Orc21)
mitosis & nuclear chromosome (with Orc2γ4)
Orthologs
Human Orthologs (via DIOPT v7.1)
Homo sapiens (Human) (1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
13 of 15
Yes
Yes
Model Organism Orthologs (via DIOPT v7.1)
Mus musculus (laboratory mouse) (1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
12 of 15
Yes
Yes
Rattus norvegicus (Norway rat) (1)
12 of 13
Yes
Yes
Xenopus tropicalis (Western clawed frog) (1)
7 of 12
Yes
Yes
Danio rerio (Zebrafish) (2)
5 of 15
Yes
Yes
1 of 15
No
No
Caenorhabditis elegans (Nematode, roundworm) (1)
8 of 15
Yes
Yes
Arabidopsis thaliana (thale-cress) (1)
7 of 9
Yes
Yes
Saccharomyces cerevisiae (Brewer's yeast) (2)
12 of 15
Yes
Yes
1 of 15
No
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
9 of 12
Yes
Yes
Orthologs in Drosophila Species (via OrthoDB v9.1) ( EOG091907F0 )
Organism
Common Name
Gene
AAA Syntenic Ortholog
Multiple Dmel Genes in this Orthologous Group
Drosophila melanogaster
fruit fly
Drosophila suzukii
Spotted wing Drosophila
Drosophila simulans
Drosophila sechellia
Drosophila erecta
Drosophila yakuba
Drosophila ananassae
Drosophila pseudoobscura pseudoobscura
Drosophila persimilis
Drosophila willistoni
Drosophila virilis
Drosophila mojavensis
Drosophila grimshawi
Orthologs in non-Drosophila Dipterans (via OrthoDB v9.1) ( EOG09150418 )
Organism
Common Name
Gene
Multiple Dmel Genes in this Orthologous Group
Musca domestica
House fly
Glossina morsitans
Tsetse fly
Lucilia cuprina
Australian sheep blowfly
Mayetiola destructor
Hessian fly
Aedes aegypti
Yellow fever mosquito
Anopheles darlingi
American malaria mosquito
Anopheles gambiae
Malaria mosquito
Culex quinquefasciatus
Southern house mosquito
Orthologs in non-Dipteran Insects (via OrthoDB v9.1) ( EOG090W03NP )
Organism
Common Name
Gene
Multiple Dmel Genes in this Orthologous Group
Bombyx mori
Silkmoth
Danaus plexippus
Monarch butterfly
Heliconius melpomene
Postman butterfly
Apis florea
Little honeybee
Apis mellifera
Western honey bee
Bombus impatiens
Common eastern bumble bee
Bombus terrestris
Buff-tailed bumblebee
Linepithema humile
Argentine ant
Megachile rotundata
Alfalfa leafcutting bee
Nasonia vitripennis
Parasitic wasp
Dendroctonus ponderosae
Mountain pine beetle
Pediculus humanus
Human body louse
Cimex lectularius
Bed bug
Acyrthosiphon pisum
Pea aphid
Acyrthosiphon pisum
Pea aphid
Acyrthosiphon pisum
Pea aphid
Zootermopsis nevadensis
Nevada dampwood termite
Orthologs in non-Insect Arthropods (via OrthoDB v9.1) ( EOG090X0AVI )
Organism
Common Name
Gene
Multiple Dmel Genes in this Orthologous Group
Strigamia maritima
European centipede
Ixodes scapularis
Black-legged tick
Stegodyphus mimosarum
African social velvet spider
Tetranychus urticae
Two-spotted spider mite
Daphnia pulex
Water flea
Orthologs in non-Arthropod Metazoa (via OrthoDB v9.1) ( EOG091G0H5Q )
Organism
Common Name
Gene
Multiple Dmel Genes in this Orthologous Group
Strongylocentrotus purpuratus
Purple sea urchin
Ciona intestinalis
Vase tunicate
Gallus gallus
Domestic chicken
Paralogs
Paralogs (via DIOPT v7.1)
Drosophila melanogaster (Fruit fly) (0)
No records found.
Human Disease Associations
FlyBase Human Disease Model Reports
    Disease Model Summary Ribbon
    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
    Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
     
    Disease Associations of Human Orthologs (via DIOPT v7.1 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
    esyN Network Diagram
    Show neighbor-neighbor interactions:
    Select Layout:
    Legend:
    Protein
    RNA
    Selected Interactor(s)
    Interactions Browser

    Please see the Physical Interaction reports below for full details
    protein-protein
    Physical Interaction
    Assay
    References
    Summary of Genetic Interactions
    esyN Network Diagram
    esyN Network Key:
    Suppression
    Enhancement

    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)
    ORC is composed of six subunits. Interacts with Mcm10.
    (UniProt, Q24168 )
    Linkouts
    BioGRID - A database of protein and genetic interactions.
    DroID - A comprehensive database of gene and protein interactions.
    InterologFinder - Protein-protein interactions (PPI) from both known and predicted PPI data sets.
    MIST (protein-protein) - An integrated Molecular Interaction Database
    Pathways
    Genomic Location and Detailed Mapping Data
    Chromosome (arm)
    3R
    Recombination map
    3-54
    Cytogenetic map
    Sequence location
    3R:13,964,885..13,967,075 [+]
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    88A3-88A3
    Limits computationally determined from genome sequence between P{PZ}flfl01949 and P{lacW}trxj14A6&P{PZ}trx00347
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    88A3-88A5
    (determined by in situ hybridisation)
    Experimentally Determined Recombination Data
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (12)
    Genomic Clones (15)
     

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

    cDNA Clones (17)
     

    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 GBrowse for alignment of the cDNAs and ESTs to the gene model.

    cDNA clones, fully sequences
    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
      GenomeRNAi - A database for cell-based and in vivo RNAi phenotypes and reagents
      Antibody Information
      Laboratory Generated Antibodies
      Commercially Available Antibodies
       
      Other Information
      Relationship to Other Genes
      Source for database identify of
      Source for database merge of
      Source for merge of: l(3)dsl5 l(3)SG44
      Additional comments
      Other Comments
      The ATP dependent DNA binding activity of the Orc1/Orc2 protein complex is reduced or inhibited by phosphorylation of Orc2.
      Mutants arrest in metaphase with abnormally condensed chromosomes that fail to align at the metaphase plate within a poorly assembled mitotic spindle.
      Orc2 functions in chromosome architecture and replication timing.
      The abundance of Orc2 is developmentally regulated and is greatest during the early stages of embryogenesis, concomitant with the highest rate of DNA replication. Fractionation of embryo nuclear extracts reveals that Orc2 is found in a tightly associated complex with five additional polypeptides.
      Homozygous larvae contain rudimentary imaginal discs, but disc primordia do not grow during larval development; testes and ovaries smaller than normal and cell number in central nervous system reduced. Mutant gonads do not survive metamorphosis when implanted into wild-type larvae. Homozygous cuticular clones appear to develop normally, but abdominal clones reduced in frequency and size compared to control clones. Mutant larvae support growth of implanted wild-type discs. Normal gene product postulated to be required for cell proliferation; survival of somatic epidermal clones attributed to perdurance. Larval ganglia exhibit extremely low mitotic index; chromosomes irregularly condensed and chromosome breakage observed (Gatti and Baker, 1989); salivary chromosomes appear normal.
      Origin and Etymology
      Discoverer
      Etymology
      Identification
      External Crossreferences and Linkouts ( 45 )
      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/Swiss-Prot - Manually annotated and reviewed records of protein sequence and functional information
      Other crossreferences
      BDGP expression data - Patterns of gene expression in Drosophila embryogenesis
      Drosophila Genomics Resource Center - Drosophila Genomics Resource Center (DGRC) cDNA clones
      Eukaryotic Promoter Database - A collection of databases of experimentally validated promoters for selected model organisms.
      Fly-FISH - A database of Drosophila embryo and larvae mRNA localization patterns
      Flygut - An atlas of the Drosophila adult midgut
      GenomeRNAi - A database for cell-based and in vivo RNAi phenotypes and reagents
      InterPro - A database of protein families, domains and functional sites
      KEGG Genes - Molecular building blocks of life in the genomic space.
      modMine - A data warehouse for the modENCODE project
      Linkouts
      BioGRID - A database of protein and genetic interactions.
      DroID - A comprehensive database of gene and protein interactions.
      DRSC - Results frm RNAi screens
      FLIGHT - Cell culture data for RNAi and other high-throughput technologies
      FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
      FlyMine - An integrated database for Drosophila genomics
      Interactive Fly - A cyberspace guide to Drosophila development and metazoan evolution
      InterologFinder - Protein-protein interactions (PPI) from both known and predicted PPI data sets.
      MIST (protein-protein) - An integrated Molecular Interaction Database
      Synonyms and Secondary IDs (27)
      Reported As
      Symbol Synonym
      fs(3)293-19
      l(3)A5
      l(3)SG44
      l(3)dsl5
      Name Synonyms
      Origin Recognition Complex subunit 2
      Origin recognition complex subunit 2
      lethal(3)88Ab
      origin recognition complex
      origin recognition complex 2
      Secondary FlyBase IDs
      • FBgn0001009
      • FBgn0002365
      Datasets (1)
      Study focus (1)
      Experimental Role
      Project
      Project Type
      Title
      • bait_protein
      Genome-wide localization of essential replication factors characterized by ChIP-Seq and ChIP-chip.
      References (204)