Open Close
General Information
Symbol
Dmel\Prim1
Species
D. melanogaster
Name
DNA primase subunit 1
Annotation Symbol
CG7108
Feature Type
FlyBase ID
FBgn0011762
Gene Model Status
Stock Availability
Enzyme Name (EC)
DNA primase DnaG (2.7.7.101)
Gene Summary
DNA primase subunit 1 (Prim1) encodes a subunit of the DNA-polymerase alpha complex that, together with the subunit encoded by Prim2, is responsible for primase activity (synthesis of short RNA primers). This activity is required during DNA replication to prime DNA synthesis at origins, and also on the lagging strand during Okazaki fragment synthesis. [Date last reviewed: 2019-09-26] (FlyBase Gene Snapshot)
Also Known As

DNApol-α50, DNA polymerase α, DNApol-alpha50, Dpri50, pol α

Key Links
Genomic Location
Cytogenetic map
Sequence location
3L:8,340,314..8,344,404 [+]
Recombination map
3-24
RefSeq locus
NT_037436 REGION:8340314..8344404
Sequence
Other Genome Views
The following external sites may use different assemblies or annotations than FlyBase.
Function
GO Summary Ribbons
Gene Ontology (GO) Annotations (4 terms)
Molecular Function (1 term)
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:PTN000056764
(assigned by GO_Central )
Biological Process (2 terms)
Terms Based on Experimental Evidence (2 terms)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000056764
(assigned by GO_Central )
Cellular Component (1 term)
Terms Based on Experimental Evidence (1 term)
CV Term
Evidence
References
Terms Based on Predictions or Assertions (1 term)
CV Term
Evidence
References
inferred from biological aspect of ancestor with PANTHER:PTN000056765
(assigned by GO_Central )
Protein Family (UniProt)
Belongs to the eukaryotic-type primase small subunit family. (Q24317)
Catalytic Activity (EC)
Experimental Evidence
SsDNA + n NTP = ssDNA/pppN(pN)(n-1) hybrid + (n-1) diphosphate (2.7.7.101)
Predictions / Assertions
SsDNA + n NTP = ssDNA/pppN(pN)(n-1) hybrid + (n-1) diphosphate (2.7.7.101)
Summaries
Gene Snapshot
DNA primase subunit 1 (Prim1) encodes a subunit of the DNA-polymerase alpha complex that, together with the subunit encoded by Prim2, is responsible for primase activity (synthesis of short RNA primers). This activity is required during DNA replication to prime DNA synthesis at origins, and also on the lagging strand during Okazaki fragment synthesis. [Date last reviewed: 2019-09-26]
Gene Group (FlyBase)
DNA POLYMERASE ALPHA-PRIMASE -
DNA polymerase alpha-primase synthesizes short RNA-DNA primers on the lagging strand during DNA synthesis. It is a heterotetramer composed of two polymerase subunits (DNApol-α180 and DNApol-α73) and two primase subunits (DNApol-α50 and DNApol-α60). DNApol-α180 and DNApol-α50 encode the DNA polymerase and RNA primase catalytic activities, respectively, while DNApol-α73 and DNApol-α60 encode the regulatory subunits. (Adapted from PMID:30005324.)
RNA POLYMERASE CATALYTIC SUBUNITS -
DNA-directed RNA polymerases (RNAPs) catalyze the synthesis of RNA from DNA templates. Nuclear DNA is transcribed by three different multi-subunit polymerases, RNAPs I, II and III, which synthesize mRNAs, rRNAs, tRNAs and other non-coding RNAs. Although composed of between 12-17 subunits, all three nuclear RNAPs contain a ten-subunit catalytic core. Mitochondrial RNA is synthesized by a single subunit RNA polymerase. DNA primases are a class of RNA polymerases that catalyse the synthesis of short RNA primers that are extended by DNA polymerases during DNA replication. (Adapted from PMID:22365827 and PMID:19540940.)
Protein Function (UniProtKB)
Catalytic subunit of the DNA primase complex and component of the DNA polymerase alpha complex (also known as the alpha DNA polymerase-primase complex) which play an essential role in the initiation of DNA synthesis (PubMed:6773966, PubMed:6806812, PubMed:6812052, PubMed:6403945, PubMed:6409898). During the S phase of the cell cycle, the DNA polymerase alpha complex (composed of a catalytic subunit PolA1, an accessory subunit PolA2 and two primase subunits, the catalytic subunit Prim1 and the regulatory subunit Prim2) is recruited to DNA at the replicative forks (By similarity). The primase subunit of the polymerase alpha complex initiates DNA synthesis by oligomerising short RNA primers on both leading and lagging strands (By similarity). These primers are initially extended by the polymerase alpha catalytic subunit and subsequently transferred to polymerase delta and polymerase epsilon for processive synthesis on the lagging and leading strand, respectively (By similarity). In the primase complex, both subunits are necessary for the initial di-nucleotide formation, but the extension of the primer depends only on the catalytic subunit (By similarity). Can add both ribo- and deoxynucleotides during elongation of the primers (PubMed:6812052). Binds single stranded DNA (By similarity).
(UniProt, Q24317)
Gene Model and Products
Number of Transcripts
1
Number of Unique Polypeptides
1

Please see the JBrowse view of Dmel\Prim1 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

Gene model reviewed during 5.46

Sequence Ontology: Class of Gene
Transcript Data
Annotated Transcripts
Name
FlyBase ID
RefSeq ID
Length (nt)
Assoc. CDS (aa)
FBtr0076603
1569
438
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
RefSeq ID
GenBank
FBpp0076330
50.2
438
7.55
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)
Comments
External Data
Subunit Structure (UniProtKB)

Heterodimer of a catalytic subunit Prim1 and a regulatory subunit Prim2, also known as the DNA primase complex (PubMed:6403945, PubMed:6409898). Component of the alpha DNA polymerase complex (also known as the alpha DNA polymerase-primase complex) consisting of four subunits: the catalytic subunit PolA1, the regulatory subunit PolA2, and the primase complex subunits Prim1 and Prim2 respectively (PubMed:6773966, PubMed:6403945, PubMed:6409898). PolA1 associates with the DNA primase complex before association with PolA2 (PubMed:6409898).

(UniProt, Q24317)
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\Prim1 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
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
Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Polypeptide Expression
Additional Descriptive Data
Marker for
 
Subcellular Localization
CV Term
Evidence
References
Expression Deduced from Reporters
High-Throughput Expression Data
Associated Tools

GBrowse - Visual display of RNA-Seq signals

View Dmel\Prim1 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
EMBL-EBI Single Cell Expression Atlas
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
Alleles, Insertions, Transgenic Constructs, and Aberrations
Classical and Insertion Alleles ( 4 )
For All Classical and Insertion Alleles Show
 
Other relevant insertions
Transgenic Constructs ( 5 )
For All Alleles Carried on Transgenic Constructs Show
Transgenic constructs containing/affecting coding region of Prim1
Transgenic constructs containing regulatory region of Prim1
Aberrations (Deficiencies and Duplications) ( 1 )
Inferred from experimentation ( 1 )
Gene disrupted in
Inferred from location ( 0 )
Alleles Representing Disease-Implicated Variants
Phenotypes
Orthologs
Human Orthologs (via DIOPT v8.0)
Homo sapiens (Human) (1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
14 of 15
Yes
Yes
Model Organism Orthologs (via DIOPT v8.0)
Mus musculus (laboratory mouse) (1)
Species\Gene Symbol
Score
Best Score
Best Reverse Score
Alignment
Complementation?
Transgene?
14 of 15
Yes
Yes
Rattus norvegicus (Norway rat) (1)
6 of 13
Yes
Yes
Xenopus tropicalis (Western clawed frog) (1)
9 of 12
Yes
Yes
Danio rerio (Zebrafish) (1)
10 of 15
Yes
Yes
Caenorhabditis elegans (Nematode, roundworm) (2)
14 of 15
Yes
Yes
14 of 15
Yes
Yes
Arabidopsis thaliana (thale-cress) (1)
8 of 9
Yes
Yes
Saccharomyces cerevisiae (Brewer's yeast) (1)
14 of 15
Yes
Yes
Schizosaccharomyces pombe (Fission yeast) (1)
11 of 12
Yes
Yes
Ortholog(s) in Drosophila Species (via OrthoDB v9.1) ( EOG0919083Q )
Organism
Common Name
Gene
AAA Syntenic Ortholog
Multiple Dmel Genes in this Orthologous Group
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) ( EOG091504UH )
Organism
Common Name
Gene
Multiple Dmel Genes in this Orthologous Group
Musca domestica
House fly
Glossina morsitans
Tsetse fly
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) ( EOG090W04P6 )
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
Nasonia vitripennis
Parasitic wasp
Dendroctonus ponderosae
Mountain pine beetle
Tribolium castaneum
Red flour beetle
Pediculus humanus
Human body louse
Rhodnius prolixus
Kissing bug
Cimex lectularius
Bed bug
Acyrthosiphon pisum
Pea aphid
Zootermopsis nevadensis
Nevada dampwood termite
Orthologs in non-Insect Arthropods (via OrthoDB v9.1) ( EOG090X06O2 )
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
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) ( EOG091G0EAF )
Organism
Common Name
Gene
Multiple Dmel Genes in this Orthologous Group
Strongylocentrotus purpuratus
Purple sea urchin
Ciona intestinalis
Vase tunicate
Paralogs
Paralogs (via DIOPT v8.0)
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 ( 1 )
    Allele
    Disease
    Interaction
    References
    Disease Associations of Human Orthologs (via DIOPT v8.0 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
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    Starting gene(s)
    Interaction type
    Interacting gene(s)
    Reference
    External Data
    Subunit Structure (UniProtKB)
    Heterodimer of a catalytic subunit Prim1 and a regulatory subunit Prim2, also known as the DNA primase complex (PubMed:6403945, PubMed:6409898). Component of the alpha DNA polymerase complex (also known as the alpha DNA polymerase-primase complex) consisting of four subunits: the catalytic subunit PolA1, the regulatory subunit PolA2, and the primase complex subunits Prim1 and Prim2 respectively (PubMed:6773966, PubMed:6403945, PubMed:6409898). PolA1 associates with the DNA primase complex before association with PolA2 (PubMed:6409898).
    (UniProt, Q24317 )
    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
    Genomic Location and Detailed Mapping Data
    Chromosome (arm)
    3L
    Recombination map
    3-24
    Cytogenetic map
    Sequence location
    3L:8,340,314..8,344,404 [+]
    FlyBase Computed Cytological Location
    Cytogenetic map
    Evidence for location
    66C7-66C8
    Limits computationally determined from genome sequence between P{lacW}l(3)L0139L0139 and P{PZ}Gug03928&P{EP}CG6745EP595b
    Experimentally Determined Cytological Location
    Cytogenetic map
    Notes
    References
    Experimentally Determined Recombination Data
    Location
    Left of (cM)
    Right of (cM)
    Notes
    Stocks and Reagents
    Stocks (4)
    Genomic Clones (12)
     

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

    cDNA Clones (79)
     

    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 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
      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 identity of: Prim1 DNApol-α50

      Source for database merge of

      Source for merge of: DNApol-α50 anon-WO0140519.257

      Additional comments

      Source for merge of DNApol-α50 anon-WO0140519.257 was sequence comparison ( date:051113 ).

      Other Comments

      Subunits of DNA polymerase α and δ are purified from embryos and characterised.

      DNApol-α50 has been cloned and characterised. Expression patterns of DNApol-α50 protein and transcript throughout development are consistent with a role of the protein in DNA replication.

      The properties of the DNA polymerase α enzyme have been studied.

      25bp DNA oligomer containing m4T is used in a gel extension assay to measure the efficiency of incorporation of dATP and dGTP opposite m4T using a DNA polymerase α-primase complex. The DNA polymerase α shows a clear preference for pairing with dGTP.

      Origin and Etymology
      Discoverer
      Etymology
      Identification
      External Crossreferences and Linkouts ( 46 )
      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
      Drosophila Genomics Resource Center - Drosophila Genomics Resource Center (DGRC) cDNA clones
      EMBL-EBI Single Cell Expression Atlas
      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
      iBeetle-Base - RNAi phenotypes in the red flour beetle (Tribolium castaneum)
      InterPro - A database of protein families, domains and functional sites
      KEGG Genes - Molecular building blocks of life in the genomic space.
      MARRVEL_MODEL
      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
      FlyAtlas - Adult expression by tissue, using Affymetrix Dros2 array
      FlyCyc Genes - Genes from a BioCyc PGDB for Dmel
      FlyMine - An integrated database for Drosophila genomics
      KEGG Pathways - Wiring diagrams of molecular interactions, reactions and relations.
      MIST (protein-protein) - An integrated Molecular Interaction Database
      Synonyms and Secondary IDs (34)
      Reported As
      Name Synonyms
      DNA polymerase 50K
      DNA polymerase alpha 50 kda primase subunit
      DNA polymerase alpha 50kD subunit
      DNA polymerase α 46,000 γ subunit
      DNA polymerase α 50,000 γ subunit
      DNA polymerase α 50kD
      DNA primase subunit 1
      DNA-polymerase α
      p50 subunit of DNA polymerase α
      Secondary FlyBase IDs
      • FBgn0044611
      Datasets (0)
      Study focus (0)
      Experimental Role
      Project
      Project Type
      Title
      References (85)