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TOP3A DNA topoisomerase III alpha [ Homo sapiens (human) ]

Gene ID: 7156, updated on 10-Dec-2019

Summary

Official Symbol
TOP3Aprovided by HGNC
Official Full Name
DNA topoisomerase III alphaprovided by HGNC
Primary source
HGNC:HGNC:11992
See related
Ensembl:ENSG00000177302 MIM:601243
Gene type
protein coding
RefSeq status
REVIEWED
Organism
Homo sapiens
Lineage
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as
TOP3; PEOB5; ZGRF7; MGRISCE2
Summary
This gene encodes a DNA topoisomerase, an enzyme that controls and alters the topologic states of DNA during transcription. This enzyme catalyzes the transient breaking and rejoining of a single strand of DNA which allows the strands to pass through one another, thus reducing the number of supercoils and altering the topology of DNA. This enzyme forms a complex with BLM which functions in the regulation of recombination in somatic cells. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2016]
Expression
Ubiquitous expression in testis (RPKM 4.1), bone marrow (RPKM 3.1) and 25 other tissues See more
Orthologs

Genomic context

See TOP3A in Genome Data Viewer
Location:
17p11.2
Exon count:
19
Annotation release Status Assembly Chr Location
109.20191205 current GRCh38.p13 (GCF_000001405.39) 17 NC_000017.11 (18269958..18314996, complement)
105 previous assembly GRCh37.p13 (GCF_000001405.25) 17 NC_000017.10 (18177235..18218321, complement)

Chromosome 17 - NC_000017.11Genomic Context describing neighboring genes Neighboring gene LLGL scribble cell polarity complex component 1 Neighboring gene FLII actin remodeling protein Neighboring gene mitochondrial elongation factor 2 Neighboring gene ribosomal protein L21 pseudogene 121 Neighboring gene ribosomal protein L7a pseudogene 65 Neighboring gene SMCR8-C9orf72 complex subunit Neighboring gene serine hydroxymethyltransferase 1 Neighboring gene microRNA 6778

Genomic regions, transcripts, and products

Expression

  • Project title: HPA RNA-seq normal tissues
  • Description: RNA-seq was performed of tissue samples from 95 human individuals representing 27 different tissues in order to determine tissue-specificity of all protein-coding genes
  • BioProject: PRJEB4337
  • Publication: PMID 24309898
  • Analysis date: Wed Apr 4 07:08:55 2018

Bibliography

GeneRIFs: Gene References Into Functions

What's a GeneRIF?

Pathways from BioSystems

  • Bloom's syndrome complex, organism-specific biosystem (from KEGG)
    Bloom's syndrome complex, organism-specific biosystemStructural complex; Genetic information processing; Repair system
  • Bloom's syndrome complex, conserved biosystem (from KEGG)
    Bloom's syndrome complex, conserved biosystemStructural complex; Genetic information processing; Repair system
  • Cell Cycle, organism-specific biosystem (from REACTOME)
    Cell Cycle, organism-specific biosystem
    Cell Cycle
  • Cell Cycle Checkpoints, organism-specific biosystem (from REACTOME)
    Cell Cycle Checkpoints, organism-specific biosystemA hallmark of the human cell cycle in normal somatic cells is its precision. This remarkable fidelity is achieved by a number of signal transduction pathways, known as checkpoints, which monitor cell...
  • DNA Double-Strand Break Repair, organism-specific biosystem (from REACTOME)
    DNA Double-Strand Break Repair, organism-specific biosystemNumerous types of DNA damage can occur within a cell due to the endogenous production of oxygen free radicals, normal alkylation reactions, or exposure to exogenous radiations and chemicals. Double-s...
  • DNA Repair, organism-specific biosystem (from REACTOME)
    DNA Repair, organism-specific biosystemDNA repair is a phenomenal multi-enzyme, multi-pathway system required to ensure the integrity of the cellular genome. Living organisms are constantly exposed to harmful metabolic by-products, enviro...
  • Fanconi anemia pathway, organism-specific biosystem (from KEGG)
    Fanconi anemia pathway, organism-specific biosystemThe Fanconi anemia pathway is required for the efficient repair of damaged DNA, especially interstrand cross-links (ICLs). DNA ICL is directly recognized by FANCM and associated proteins, that recrui...
  • Fanconi anemia pathway, conserved biosystem (from KEGG)
    Fanconi anemia pathway, conserved biosystemThe Fanconi anemia pathway is required for the efficient repair of damaged DNA, especially interstrand cross-links (ICLs). DNA ICL is directly recognized by FANCM and associated proteins, that recrui...
  • G2/M Checkpoints, organism-specific biosystem (from REACTOME)
    G2/M Checkpoints, organism-specific biosystemG2/M checkpoints include the checks for damaged DNA, unreplicated DNA, and checks that ensure that the genome is replicated once and only once per cell cycle. If cells pass these checkpoints, they f...
  • G2/M DNA damage checkpoint, organism-specific biosystem (from REACTOME)
    G2/M DNA damage checkpoint, organism-specific biosystemThroughout the cell cycle, the genome is constantly monitored for damage, resulting either from errors of replication, by-products of metabolism or through extrinsic sources such as ultra-violet or i...
  • Gene Expression, organism-specific biosystem (from REACTOME)
    Gene Expression, organism-specific biosystemGene Expression covers the pathways by which genomic DNA is transcribed to yield RNA, the regulation of these transcription processes, and the pathways by which newly-made RNA Transcripts are process...
  • Generic Transcription Pathway, organism-specific biosystem (from REACTOME)
    Generic Transcription Pathway, organism-specific biosystemOVERVIEW OF TRANSCRIPTION REGULATION: Detailed studies of gene transcription regulation in a wide variety of eukaryotic systems has revealed the general principles and mechanisms by which cell- or t...
  • HDR through Homologous Recombination (HR) or Single Strand Annealing (SSA), organism-specific biosystem (from REACTOME)
    HDR through Homologous Recombination (HR) or Single Strand Annealing (SSA), organism-specific biosystemHomology directed repair (HDR) of replication-independent DNA double strand breaks (DSBs) via homologous recombination repair (HRR) or single strand annealing (SSA) requires the activation of ATM fol...
  • HDR through Homologous Recombination (HRR), organism-specific biosystem (from REACTOME)
    HDR through Homologous Recombination (HRR), organism-specific biosystemHomology directed repair (HDR) through homologous recombination is known as homologous recombination repair (HRR). HRR occurs after extensive resection of DNA double strand break (DSB) ends, which cr...
  • HDR through Single Strand Annealing (SSA), organism-specific biosystem (from REACTOME)
    HDR through Single Strand Annealing (SSA), organism-specific biosystemHomology directed repair (HDR) through single strand annealing (SSA), similar to HDR through homologous recombination repair (HRR), involves extensive resection of DNA double strand break ends (DSBs)...
  • Homologous DNA Pairing and Strand Exchange, organism-specific biosystem (from REACTOME)
    Homologous DNA Pairing and Strand Exchange, organism-specific biosystemThe presynaptic phase of homologous DNA pairing and strand exchange begins with the displacement of RPA from 3'-ssDNA overhangs created by extensive resection of DNA double strand break (DSB) ends. R...
  • Homologous recombination, organism-specific biosystem (from KEGG)
    Homologous recombination, organism-specific biosystemHomologous recombination (HR) is essential for the accurate repair of DNA double-strand breaks (DSBs), potentially lethal lesions. HR takes place in the late S-G2 phase of the cell cycle and involves...
  • Homologous recombination, conserved biosystem (from KEGG)
    Homologous recombination, conserved biosystemHomologous recombination (HR) is essential for the accurate repair of DNA double-strand breaks (DSBs), potentially lethal lesions. HR takes place in the late S-G2 phase of the cell cycle and involves...
  • Homology Directed Repair, organism-specific biosystem (from REACTOME)
    Homology Directed Repair, organism-specific biosystemHomology directed repair (HDR) of DNA double strand breaks (DSBs) requires resection of DNA DSB ends. Resection creates 3'-ssDNA overhangs which then anneal with a homologous DNA sequence. This homol...
  • Meiosis, organism-specific biosystem (from REACTOME)
    Meiosis, organism-specific biosystemDuring meiosis the replicated chromosomes of a single diploid cell are segregated into 4 haploid daughter cells by two successive divisions, meiosis I and meiosis II. In meiosis I, the distinguishing...
  • Meiotic recombination, organism-specific biosystem (from REACTOME)
    Meiotic recombination, organism-specific biosystemMeiotic recombination exchanges segments of duplex DNA between chromosomal homologs, generating genetic diversity (reviewed in Handel and Schimenti 2010, Inagaki et al. 2010, Cohen et al. 2006). Ther...
  • Presynaptic phase of homologous DNA pairing and strand exchange, organism-specific biosystem (from REACTOME)
    Presynaptic phase of homologous DNA pairing and strand exchange, organism-specific biosystemThe presynaptic phase of homologous DNA pairing and strand exchange during homologous recombination repair (HRR) begins with the displacement of RPA from ssDNA (Thompson and Limoli 2003) by the joint...
  • Processing of DNA double-strand break ends, organism-specific biosystem (from REACTOME)
    Processing of DNA double-strand break ends, organism-specific biosystemHomology directed repair (HDR) through homologous recombination (HRR) or single strand annealing (SSA) requires extensive resection of DNA double strand break (DSB) ends (Thompson and Limoli 2003, Ci...
  • Regulation of TP53 Activity, organism-specific biosystem (from REACTOME)
    Regulation of TP53 Activity, organism-specific biosystemProtein stability and transcriptional activity of TP53 (p53) tumor suppressor are regulated by post-translational modifications that include ubiquitination, phosphorylation, acetylation, methylation,...
  • Regulation of TP53 Activity through Phosphorylation, organism-specific biosystem (from REACTOME)
    Regulation of TP53 Activity through Phosphorylation, organism-specific biosystemPhosphorylation of TP53 (p53) at the N-terminal serine residues S15 and S20 plays a critical role in protein stabilization as phosphorylation at these sites interferes with binding of the ubiquitin l...
  • Resolution of D-Loop Structures, organism-specific biosystem (from REACTOME)
    Resolution of D-Loop Structures, organism-specific biosystemOnce repair synthesis has occurred, the D-loop structure may be resolved either through Holliday junction intermediates or through synthesis-dependent strand-annealing (SDSA) (Prado and Aguilera 2003...
  • Resolution of D-loop Structures through Holliday Junction Intermediates, organism-specific biosystem (from REACTOME)
    Resolution of D-loop Structures through Holliday Junction Intermediates, organism-specific biosystemD-loops generated after strand invasion and DNA repair synthesis during homologous recombination repair (HRR) can be resolved through Holliday junction intermediates.A D-loop can be cleaved by the co...
  • Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA), organism-specific biosystem (from REACTOME)
    Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA), organism-specific biosystemIn the synthesis-dependent strand-annealing (SDSA) model of D-loop resolution, D-loop strands extended by DNA repair synthesis dissociate from their sister chromatid complements and reanneal with the...
  • Transcriptional Regulation by TP53, organism-specific biosystem (from REACTOME)
    Transcriptional Regulation by TP53, organism-specific biosystemThe tumor suppressor TP53 (encoded by the gene p53) is a transcription factor. Under stress conditions, it recognizes specific responsive DNA elements and thus regulates the transcription of many gen...

Interactions

Products Interactant Other Gene Complex Source Pubs Description

General gene information

Markers

Homology

Gene Ontology Provided by GOA

Function Evidence Code Pubs
DNA binding TAS
Traceable Author Statement
more info
PubMed 
DNA topoisomerase activity IBA
Inferred from Biological aspect of Ancestor
more info
PubMed 
DNA topoisomerase type I activity IDA
Inferred from Direct Assay
more info
PubMed 
protein binding IPI
Inferred from Physical Interaction
more info
PubMed 
single-stranded DNA binding IDA
Inferred from Direct Assay
more info
PubMed 
zinc ion binding IEA
Inferred from Electronic Annotation
more info
 
Process Evidence Code Pubs
DNA replication TAS
Traceable Author Statement
more info
 
DNA topological change IBA
Inferred from Biological aspect of Ancestor
more info
PubMed 
DNA topological change IDA
Inferred from Direct Assay
more info
PubMed 
chromosome separation IMP
Inferred from Mutant Phenotype
more info
PubMed 
meiotic cell cycle TAS
Traceable Author Statement
more info
PubMed 
mitochondrial DNA metabolic process IMP
Inferred from Mutant Phenotype
more info
PubMed 
regulation of signal transduction by p53 class mediator TAS
Traceable Author Statement
more info
 
Component Evidence Code Pubs
PML body IDA
Inferred from Direct Assay
more info
PubMed 
chromosome IEA
Inferred from Electronic Annotation
more info
 
mitochondrial matrix IEA
Inferred from Electronic Annotation
more info
 
nucleoplasm TAS
Traceable Author Statement
more info
 
nucleus IBA
Inferred from Biological aspect of Ancestor
more info
PubMed 

General protein information

Preferred Names
DNA topoisomerase 3-alpha
Names
topo III-alpha
topoisomerase (DNA) III alpha
zinc finger, GRF-type containing 7
NP_001307688.1
NP_004609.1
XP_011522303.1
XP_024306671.1

NCBI Reference Sequences (RefSeq)

RefSeqs maintained independently of Annotated Genomes

These reference sequences exist independently of genome builds. Explain

These reference sequences are curated independently of the genome annotation cycle, so their versions may not match the RefSeq versions in the current genome build. Identify version mismatches by comparing the version of the RefSeq in this section to the one reported in Genomic regions, transcripts, and products above.

mRNA and Protein(s)

  1. NM_001320759.2NP_001307688.1  DNA topoisomerase 3-alpha isoform 2

    Status: REVIEWED

    Description
    Transcript Variant: This variant (2) lacks an alternate exon in the 5' coding region, resulting in a novel 5' UTR and the use of an alternate start codon, compared to variant 1. The encoded isoform (2) has a distinct N-terminus and is shorter, compared to isoform 1.
    Source sequence(s)
    AC127537, AF086042, AK296437, AW294300, BM462184, BY996313
    UniProtKB/Swiss-Prot
    Q13472
    Conserved Domains (6) summary
    COG0551
    Location:557633
    YrdD; ssDNA-binding Zn-finger and Zn-ribbon domains of topoisomerase 1 [Replication, recombination and repair]
    cd00186
    Location:107522
    TOP1Ac; DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA topoisomerases I and III, and eukaryotic DNA topoisomerase III and eubacterial and archael reverse gyrases. Topoisomerases clevage single or double stranded DNA ...
    pfam01131
    Location:100507
    Topoisom_bac; DNA topoisomerase
    pfam01396
    Location:560599
    zf-C4_Topoisom; Topoisomerase DNA binding C4 zinc finger
    pfam06839
    Location:800844
    zf-GRF; GRF zinc finger
    cl00718
    Location:1898
    TOPRIM; Topoisomerase-primase domain. This is a nucleotidyl transferase/hydrolase domain found in type IA, type IIA and type IIB topoisomerases, bacterial DnaG-type primases, small primase-like proteins from bacteria and archaea, OLD family nucleases from ...
  2. NM_004618.5NP_004609.1  DNA topoisomerase 3-alpha isoform 1

    See identical proteins and their annotated locations for NP_004609.1

    Status: REVIEWED

    Description
    Transcript Variant: This variant (1) represents the longer transcript and encodes the longer isoform (1).
    Source sequence(s)
    AC127537, AF086042, AW294300, BC051748, BM462184
    Consensus CDS
    CCDS11194.1
    UniProtKB/Swiss-Prot
    Q13472
    Related
    ENSP00000321636.5, ENST00000321105.10
    Conserved Domains (6) summary
    cd03362
    Location:35193
    TOPRIM_TopoIA_TopoIII; TOPRIM_TopoIA_TopoIII: The topoisomerase-primase (TORPIM) domain found in members of the type IA family of DNA topoisomerases (Topo IA) similar to topoisomerase III. Type IA DNA topoisomerases remove (relax) negative supercoils in the DNA by: cleaving ...
    COG0550
    Location:35634
    TopA; DNA topoisomerase IA [Replication, recombination and repair]
    COG0551
    Location:652728
    YrdD; ssDNA-binding Zn-finger and Zn-ribbon domains of topoisomerase 1 [Replication, recombination and repair]
    cd00186
    Location:202617
    TOP1Ac; DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA topoisomerases I and III, and eukaryotic DNA topoisomerase III and eubacterial and archael reverse gyrases. Topoisomerases clevage single or double stranded DNA ...
    pfam01396
    Location:655694
    zf-C4_Topoisom; Topoisomerase DNA binding C4 zinc finger
    pfam06839
    Location:895939
    zf-GRF; GRF zinc finger

RefSeqs of Annotated Genomes: Homo sapiens Updated Annotation Release 109.

The following sections contain reference sequences that belong to a specific genome build. Explain

Reference GRCh38.p13 Primary Assembly

Genomic

  1. NC_000017.11 Reference GRCh38.p13 Primary Assembly

    Range
    18269958..18314996 complement
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. XM_024450903.1XP_024306671.1  DNA topoisomerase 3-alpha isoform X1

    Conserved Domains (3) summary
    cd00186
    Location:1310
    TOP1Ac; DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA topoisomerases I and III, and eukaryotic DNA topoisomerase III and eubacterial and archael reverse gyrases. Topoisomerases clevage single or double stranded DNA ...
    pfam06839
    Location:588632
    zf-GRF; GRF zinc finger
    pfam01396
    Location:348387
    zf-C4_Topoisom; Topoisomerase DNA binding C4 zinc finger
  2. XM_011524001.2XP_011522303.1  DNA topoisomerase 3-alpha isoform X2

    See identical proteins and their annotated locations for XP_011522303.1

    UniProtKB/TrEMBL
    B4DSJ0
    Conserved Domains (3) summary
    cl21690
    Location:1147
    TOP1Ac; DNA Topoisomerase, subtype IA; DNA-binding, ATP-binding and catalytic domain of bacterial DNA topoisomerases I and III, and eukaryotic DNA topoisomerase III and eubacterial and archael reverse gyrases. Topoisomerases clevage single or double stranded DNA ...
    pfam01396
    Location:185224
    zf-C4_Topoisom; Topoisomerase DNA binding C4 zinc finger
    pfam06839
    Location:425469
    zf-GRF; GRF zinc finger

RNA

  1. XR_001752601.2 RNA Sequence

Reference GRCh38.p13 PATCHES

Genomic

  1. NW_017363819.1 Reference GRCh38.p13 PATCHES

    Range
    31802..75368 complement
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)
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