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DFFB DNA fragmentation factor subunit beta [ Homo sapiens (human) ]

Gene ID: 1677, updated on 6-May-2021

Summary

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Official Symbol
DFFBprovided by HGNC
Official Full Name
DNA fragmentation factor subunit betaprovided by HGNC
Primary source
HGNC:HGNC:2773
See related
Ensembl:ENSG00000169598 MIM:601883
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
CAD; CPAN; DFF2; DFF40; DFF-40
Summary
Apoptosis is a cell death process that removes toxic and/or useless cells during mammalian development. The apoptotic process is accompanied by shrinkage and fragmentation of the cells and nuclei and degradation of the chromosomal DNA into nucleosomal units. DNA fragmentation factor (DFF) is a heterodimeric protein of 40-kD (DFFB) and 45-kD (DFFA) subunits. DFFA is the substrate for caspase-3 and triggers DNA fragmentation during apoptosis. DFF becomes activated when DFFA is cleaved by caspase-3. The cleaved fragments of DFFA dissociate from DFFB, the active component of DFF. DFFB has been found to trigger both DNA fragmentation and chromatin condensation during apoptosis. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene but the biological validity of some of these variants has not been determined. [provided by RefSeq, Sep 2013]
Expression
Ubiquitous expression in duodenum (RPKM 1.4), spleen (RPKM 1.3) and 25 other tissues See more
Orthologs
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Genomic context

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See DFFB in Genome Data Viewer
Location:
1p36.32
Exon count:
11
Annotation release Status Assembly Chr Location
109.20210226 current GRCh38.p13 (GCF_000001405.39) 1 NC_000001.11 (3857286..3885429)
105.20201022 previous assembly GRCh37.p13 (GCF_000001405.25) 1 NC_000001.10 (3774040..3801993)

Chromosome 1 - NC_000001.11Genomic Context describing neighboring genes Neighboring gene leucine rich repeat containing 47 Neighboring gene Sharpr-MPRA regulatory region 1968 Neighboring gene centrosomal protein 104 Neighboring gene uncharacterized LOC107984910 Neighboring gene chromosome 1 open reading frame 174

Genomic regions, transcripts, and products

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Go to nucleotide: Graphics FASTA GenBank

Expression

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  • 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

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Related articles in PubMed

  1. An intrinsic DFF40/CAD endonuclease deficiency impairs oligonucleosomal DNA hydrolysis during caspase-dependent cell death: a common trait in human glioblastoma cells. Sánchez-Osuna M, et al. Neuro Oncol, 2016 Jul. PMID 26755073, Free PMC Article
  2. Sensitization of breast cancer cells to doxorubicin via stable cell line generation and overexpression of DFF40. Bagheri F, et al. Biochem Cell Biol, 2015 Dec. PMID 26529233, Free PMC Article
  3. Stable overexpression of DNA fragmentation factor in T-47D cells: sensitization of breast cancer cells to apoptosis in response to acetazolamide and sulfabenzamide. Bagheri F, et al. Mol Biol Rep, 2014 Nov. PMID 25086620, Free PMC Article
  4. Caspase-activated DNase is necessary and sufficient for oligonucleosomal DNA breakdown, but not for chromatin disassembly during caspase-dependent apoptosis of LN-18 glioblastoma cells. Sánchez-Osuna M, et al. J Biol Chem, 2014 Jul 4. PMID 24838313, Free PMC Article
  5. Septic sera induces apoptosis and DNA fragmentation factor 40 activation in fibroblasts. Brabant D, et al. Biochem Biophys Res Commun, 2011 Aug 26. PMID 21820410

See all (70) citations in PubMed

See citations in PubMed for homologs of this gene provided by HomoloGene

GeneRIFs: Gene References Into Functions

What's a GeneRIF?
  1. Glandular, menopause-independent DFF40, DFF45, and Bcl-2 overexpression may play an important role in the pathogenesis of endometrial polyps and benign endometrial hyperplasia
    Title: Endometrial Polyps and Benign Endometrial Hyperplasia Have Increased Prevalence of DNA Fragmentation Factors 40 and 45 (DFF40 and DFF45) Together With the Antiapoptotic B-Cell Lymphoma (Bcl-2) Protein Compared With Normal Human Endometria.
  2. we show that executioner caspase activation of the apoptotic nuclease CAD/DFF40 is essential for TRAIL-induced mutations in surviving cells. As exposure to chemotherapy drugs also activates apoptotic caspases and presumably CAD, we hypothesized that these pathways may also contribute to the mutagenesis induced by conventional chemotherapy drugs, perhaps augmenting the mutations that arise from direct DNA damage
    Title: Executioner caspases and CAD are essential for mutagenesis induced by TRAIL or vincristine.
  3. Dff40 expression is upregulated in atherosclerotic plaque.
    Title: Loss of Caspase-Activated DNase Protects Against Atherosclerosis in Apolipoprotein E-Deficient Mice.
  4. the low expression levels of DFF40/CAD and the absence of DNA laddering as common molecular traits in glioblastoma
    Title: An intrinsic DFF40/CAD endonuclease deficiency impairs oligonucleosomal DNA hydrolysis during caspase-dependent cell death: a common trait in human glioblastoma cells.
  5. Data suggest DFF40 expression in breast cancer cell line is involved in drug sensitivity/resistance to doxorubicin; apoptotic cell death due to doxorubicin (a topoisomerase II inhibitor) is enhanced by DFF40 overexpression in breast cancer cell line.
    Title: Sensitization of breast cancer cells to doxorubicin via stable cell line generation and overexpression of DFF40.
  6. Data show that the caspase-activated DNase (CAD) is activated when caspases cleave its endogenous inhibitor ICAD, resulting in the characteristic DNA laddering of apoptosis.
    Title: Engineered cellular gene-replacement platform for selective and inducible proteolytic profiling.
  7. Combinatorial use of some sulfonamides such as acetazolamide along with increased expression of DFF40 can potently kill tumor cells via apoptosis.
    Title: Stable overexpression of DNA fragmentation factor in T-47D cells: sensitization of breast cancer cells to apoptosis in response to acetazolamide and sulfabenzamide.
  8. DFF40/CAD-independent mechanism driving conformational nuclear changes during caspase-dependent cell death
    Title: Caspase-activated DNase is necessary and sufficient for oligonucleosomal DNA breakdown, but not for chromatin disassembly during caspase-dependent apoptosis of LN-18 glioblastoma cells.
  9. the highest order of chromatin compaction observed in the later steps of caspase-dependent apoptosis relies on DFF40/CAD-mediated DNA damage by generating 3'-OH ends in single-strand rather than double-strand DNA nicks/breaks
    Title: Chromatin collapse during caspase-dependent apoptotic cell death requires DNA fragmentation factor, 40-kDa subunit-/caspase-activated deoxyribonuclease-mediated 3'-OH single-strand DNA breaks.
  10. These results suggest a cooperative activity between CAD and DNAS1L3 to accomplish internucleosomal DNA fragmentation .
    Title: Apoptotic DNA fragmentation may be a cooperative activity between caspase-activated deoxyribonuclease and the poly(ADP-ribose) polymerase-regulated DNAS1L3, an endoplasmic reticulum-localized endonuclease that translocates to the nucleus during apoptosis.
Submit: New GeneRIF Correction See all GeneRIFs (36)

Phenotypes

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Find tests for this gene in the NIH Genetic Testing Registry (GTR)

Review eQTL and phenotype association data in this region using PheGenI

Associated conditions

Description Tests
Genome-wide association study identifies loci affecting blood copper, selenium and zinc.
GeneReviews: Not available

Variation

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See variants in ClinVar

See studies and variants in dbVar

See Variation Viewer (GRCh37.p13)

See Variation Viewer (GRCh38)

Genotypes

HIV-1 interactions

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Protein interactions

Protein Gene Interaction Pubs
retropepsin gag-pol HIV-1 protease directly cleaves and activates procaspase 8 in T cells, which is associated with cleavage of BID, mitochondrial release of cytochrome c, activation of the downstream caspases 9 and 3, and cleavage of DFF and PARP PubMed

Go to the HIV-1, Human Interaction Database

Pathways from PubChem

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Interactions

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Products Interactant Other Gene Complex Source Pubs Description

General gene information

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Markers

Homology

Gene Ontology Provided by GOA

Function Evidence Code Pubs
enables DNA binding IEA
Inferred from Electronic Annotation
more info
  
enables deoxyribonuclease activity IBA
Inferred from Biological aspect of Ancestor
more info
 PubMed 
enables deoxyribonuclease activity IMP
Inferred from Mutant Phenotype
more info
 PubMed 
enables disordered domain specific binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables enzyme binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables identical protein binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables protein binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables protein domain specific binding IPI
Inferred from Physical Interaction
more info
 PubMed 
Process Evidence Code Pubs
involved_in DNA catabolic process IMP
Inferred from Mutant Phenotype
more info
 PubMed 
involved_in apoptotic DNA fragmentation IBA
Inferred from Biological aspect of Ancestor
more info
 PubMed 
acts_upstream_of_or_within apoptotic DNA fragmentation IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in apoptotic DNA fragmentation IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in apoptotic DNA fragmentation TAS
Traceable Author Statement
more info
  
involved_in apoptotic chromosome condensation IDA
Inferred from Direct Assay
more info
 PubMed 
Component Evidence Code Pubs
colocalizes_with chromatin IDA
Inferred from Direct Assay
more info
 PubMed 
located_in chromatin IDA
Inferred from Direct Assay
more info
 PubMed 
located_in cytosol IDA
Inferred from Direct Assay
more info
 PubMed 
located_in cytosol TAS
Traceable Author Statement
more info
  
located_in nucleolus IDA
Inferred from Direct Assay
more info
  
located_in nucleoplasm IDA
Inferred from Direct Assay
more info
  
located_in nucleoplasm TAS
Traceable Author Statement
more info
  
located_in nucleus IDA
Inferred from Direct Assay
more info
 PubMed 
part_of protein-containing complex IDA
Inferred from Direct Assay
more info
 PubMed 

General protein information

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Preferred Names
DNA fragmentation factor subunit beta
Names
DNA fragmentation factor 40 kDa subunit
DNA fragmentation factor, 40kDa, beta polypeptide (caspase-activated DNase)
caspase-activated DNase
caspase-activated deoxyribonuclease
caspase-activated nuclease

NCBI Reference Sequences (RefSeq)

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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_001282669.2 → NP_001269598.1  DNA fragmentation factor subunit beta isoform 1

    See identical proteins and their annotated locations for NP_001269598.1

    Status: REVIEWED

    Description
    Transcript Variant: This variant (1) encodes the longer isoform (1).
    Source sequence(s)
    AK303065, AL691523, BC032827
    Consensus CDS
    CCDS72693.1
    UniProtKB/TrEMBL
    B4DZS0, Q96P73
    Related
    ENSP00000339524.4, ENST00000338895.7
    Conserved Domains (2) summary
    cd06535
    Location:4 → 80
    CIDE_N_CAD; CIDE_N domain of CAD nuclease. The CIDE_N (cell death-inducing DFF45-like effector, N-terminal) domain is found at the N-terminus of CAD nuclease (caspase-activated DNase/DNA fragmentation factor, DFF40) and its inhibitor, ICAD(DFF45). These proteins are ...
    pfam09230
    Location:124 → 347
    DFF40; DNA fragmentation factor 40 kDa

  2. NM_001320132.2 → NP_001307061.1  DNA fragmentation factor subunit beta isoform 4

    Status: REVIEWED

    Description
    Transcript Variant: This variant (4) differs in the 5' UTR, lacks a portion of the 5' coding region and uses an alternate start codon, compared to variant 1. It encodes isoform 4, which has a shorter and distinct N-terminus, compared to isoform 1.
    Source sequence(s)
    AB028912, AF409060, AK027141, BC032827
    UniProtKB/Swiss-Prot
    O76075
    UniProtKB/TrEMBL
    Q96P73, Q96P74
    Conserved Domains (1) summary
    pfam09230
    Location:51 → 274
    DFF40; DNA fragmentation factor 40 kDa

  3. NM_001320136.2 → NP_001307065.1  DNA fragmentation factor subunit beta isoform 5

    Status: REVIEWED

    Description
    Transcript Variant: This variant (5) differs in the 5' UTR, lacks a portion of the 5' coding region and uses a downstrean in-frame start codon, compared to variant 1. It encodes isoform 5, which is shorter at the N-terminus, compared to isoform 1.
    Source sequence(s)
    AF409062, AK027141, BC032827, DC368011
    UniProtKB/TrEMBL
    Q96P72, Q96P73
    Conserved Domains (1) summary
    pfam09230
    Location:36 → 259
    DFF40; DNA fragmentation factor 40 kDa

  4. NM_004402.4 → NP_004393.1  DNA fragmentation factor subunit beta isoform 2

    See identical proteins and their annotated locations for NP_004393.1

    Status: REVIEWED

    Description
    Transcript Variant: This variant (2) contains two consecutive alternate splice junctions compared to variant 1. The resulting isoform (2) has the same N- and C-termini but lacks an internal segment compared to isoform 1.
    Source sequence(s)
    AL691523, BC032827, BC048797
    Consensus CDS
    CCDS52.1
    UniProtKB/Swiss-Prot
    O76075
    UniProtKB/TrEMBL
    Q96P73
    Related
    ENSP00000367454.4, ENST00000378209.8
    Conserved Domains (2) summary
    cd06535
    Location:4 → 80
    CIDE_N_CAD; CIDE_N domain of CAD nuclease. The CIDE_N (cell death-inducing DFF45-like effector, N-terminal) domain is found at the N-terminus of CAD nuclease (caspase-activated DNase/DNA fragmentation factor, DFF40) and its inhibitor, ICAD(DFF45). These proteins are ...
    pfam09230
    Location:100 → 323
    DFF40; DNA fragmentation factor 40 kDa

RNA

  1. NR_104222.2 RNA Sequence

    Status: REVIEWED

    Description
    Transcript Variant: This variant (3) uses an alternate splice junction and contains an alternate exon compared to variant 1. This variant is represented as non-coding because the use of the 5'-most expected translational start codon, as used in variant 1, renders the transcript a candidate for nonsense-mediated mRNA decay (NMD).
    Source sequence(s)
    AL691523, BC032827
    Related
    ENST00000468793.5

  2. NR_135150.2 RNA Sequence

    Status: REVIEWED

    Description
    Transcript Variant: This variant (6) uses alternate splice sites in two internal exons and contains an additional internal exon, compared to variant 1. This variant is represented as non-coding because the use of the 5'-most expected translational start codon renders the transcript a candidate for nonsense-mediated mRNA decay (NMD).
    Source sequence(s)
    AB028911, AF409060, AK027141, AL691523, BC032827
    Related
    ENST00000491998.5

  3. NR_135151.2 RNA Sequence

    Status: REVIEWED

    Description
    Transcript Variant: This variant (7) uses alternate splice sites in two internal exons and contains an additional internal exon, compared to variant 1. This variant is represented as non-coding because the use of the 5'-most expected translational start codon renders the transcript a candidate for nonsense-mediated mRNA decay (NMD).
    Source sequence(s)
    AB028913, AF409060, AK027141, BC032827, CN275847
    Related
    ENST00000477548.5

  4. NR_135152.2 RNA Sequence

    Status: REVIEWED

    Description
    Transcript Variant: This variant (8) uses an alternate splice site in an internal exon, compared to variant 1. This variant is represented as non-coding because the use of the 5'-most expected translational start codon renders the transcript a candidate for nonsense-mediated mRNA decay (NMD).
    Source sequence(s)
    AF409061, AK027141, BC032827, DC368011
    Related
    ENST00000475969.5

RefSeqs of Annotated Genomes: Homo sapiens Updated Annotation Release 109.20210226

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

Reference GRCh38.p13 Primary Assembly

Genomic

  1. NC_000001.11 Reference GRCh38.p13 Primary Assembly

    Range
    3857286..3885429
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. XM_017000498.2 → XP_016855987.1  DNA fragmentation factor subunit beta isoform X1

  2. XM_017000499.1 → XP_016855988.1  DNA fragmentation factor subunit beta isoform X2

  3. XM_011540865.2 → XP_011539167.1  DNA fragmentation factor subunit beta isoform X4

    Conserved Domains (2) summary
    cd06535
    Location:4 → 80
    CIDE_N_CAD; CIDE_N domain of CAD nuclease. The CIDE_N (cell death-inducing DFF45-like effector, N-terminal) domain is found at the N-terminus of CAD nuclease (caspase-activated DNase/DNA fragmentation factor, DFF40) and its inhibitor, ICAD(DFF45). These proteins are ...
    pfam09230
    Location:124 → 168
    DFF40; DNA fragmentation factor 40 kDa

  4. XM_017000500.1 → XP_016855989.1  DNA fragmentation factor subunit beta isoform X3

RNA

  1. XR_946563.2 RNA Sequence

  2. XR_002959574.1 RNA Sequence

  3. XR_946565.1 RNA Sequence

  4. XR_001737013.1 RNA Sequence

  5. XR_001737011.2 RNA Sequence

  6. XR_001737012.2 RNA Sequence

Suppressed Reference Sequence(s)

The following Reference Sequences have been suppressed. Explain

  1. NM_001004285.1: Suppressed sequence

    Description
    NM_001004285.1: This RefSeq was permanently suppressed because it is a nonsense-mediated mRNA decay (NMD) candidate.

  2. NM_001004286.1: Suppressed sequence

    Description
    NM_001004286.1: This RefSeq was permanently suppressed because it is a nonsense-mediated mRNA decay (NMD) candidate.
Nucleotide Protein
Heading Accession and Version
Protein Accession Links
GenPept Link UniProtKB Link
O76075.1 GenPept UniProtKB/Swiss-Prot:O76075

Gene LinkOut

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