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Symbol PARN contributors: mct/npt - updated : 19-10-2018
HGNC name poly(A)-specific ribonuclease (deadenylation nuclease)
HGNC id 8609
Corresponding disease
DKCB6 dyskeratosis congenita, autosomal recessive 6
Location 16p13.12      Physical location : 14.529.558 - 14.724.124
Synonym name
  • deadenylation nuclease
  • Aspecific ribonuclease PARN
  • Synonym symbol(s) DAN, Poly
    TYPE functioning gene
    STRUCTURE 194.60 kb     24 Exon(s)
    10 Kb 5' upstream gene genomic sequence study
    MAPPING cloned Y linked N status provisional
    Map cen - HERC2P4 - D16F37S6 - PARN /D15S543 - qter
    Authors Buiting (99)
    Physical map
    COX6CP1 16p12 cytochrome c oxidase subunit VIc pseudogene 1 LOC348151 16p13.13 similar to nuclear pore complex interacting protein TNFRSF17 16p13.1 tumor necrosis factor receptor superfamily, member 17 FLJ12363 16p13.13 hypothetical protein FLJ12363 LOC92017 16p13.13 similar to RIKEN cDNA 4933437K13 LOC388213 16 LOC388213 FLJ11151 16p13.13 hypothetical protein FLJ11151 LOC390675 16 similar to TATA element modulatory factor 1 ERCC4 16p13.13 excision repair cross-complementing rodent repair deficiency, complementation group 4 MRTF-B 16p13.13 myocardin-related transcription factor B CGI-148P 16p13 CGI-148 protein pseudogene LOC388214 16 LOC388214 PARN 16p13 poly(A)-specific ribonuclease (deadenylation nuclease) BFAR 16p13.2 bifunctional apoptosis regulator PLA2G10 16p13.1-p12 phospholipase A2, group X PKD1P3 16p13.3 phospholipase A2, group X NPIP 16q13.1 nuclear pore complex interacting protein LOC123803 RRN3 16p12 RNA polymerase I transcription factor RRN3 PKD1P6 16p13.3 RNA polymerase I transcription factor RRN3 LOC388215 16 similar to hypothetical protein LOC339047 FLJ39599 16p13.13 hypothetical protein FLJ39599 BC008967 16p13.13 hypothetical gene BC008967 LOC388216 16 LOC388216 LKAP 16p13.13 limkain b1 NDE1 16p13.11 nudE nuclear distribution gene E homolog 1 (A. nidulans) MYH11 16p13.12 myosin, heavy polypeptide 11, smooth muscle FLJ31153 16p13.13-p13.12 hypothetical protein FLJ31153 LOC390676 16 similar to 60S ribosomal protein L15 ABCC1 16p13.1 ATP-binding cassette, sub-family C (CFTR/MRP), member 1 ABCC6 16p13.1 ATP-binding cassette, sub-family C (CFTR/MRP), member 6 LOC339041 16p13.12 hypothetical LOC339041 PKD1P1 16p13.3 hypothetical LOC339041 PKD1P2 16p13.3 hypothetical LOC339041
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    24 - 3000 - 578 - Zhang (2007)
    23 - 2945 - 593 - -
    24 - 3083 73.4 639 - -
    Type ubiquitous
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Digestivemouth   highly
    Endocrinethyroid   highly
    Lymphoid/Immunethymus   highly
    cell lineage
    cell lines
    at STAGE
  • a catalytic domain
  • three RNA-binding domains (the nuclease, R3H and RRM domains); compared to the RRM domain, the R3H domain played a more important role in the structural integrity of the dimeric PARN
  • a C-terminal domain
    intraspecies homolog to PNLDC1
  • Rnase D family of 3' exoribonucleases
  • CAF1 family
  • CATEGORY enzyme , RNA associated
    SUBCELLULAR LOCALIZATION     intracellular
    intracellular,nuclear envelope
    text not stably associated to ribosomes
    basic FUNCTION
  • poly A specific exoribonuclease, deadenylation nuclease, degrading poly A tail of mRNA molecules
  • intrinsic cap binding activity
  • key enzyme in eukaryotic organisms to regulate the stability of mRNA by degrading the 3' poly-(A) tail
  • PARN participates in diverse and important intracellular processes by acting as a regulator of mRNA stability and translational efficiency
  • PARN modulates decay of a defined set of mRNAs in mammalian cells and implicate this deadenylase in coordinating control of genes required for cell movement
  • PARN is a divalent metal-ion dependent poly(A)-specific, processive and cap-interacting 3'-5' exoribonuclease that efficiently degrades poly(A) tails of eukaryotic mRNAs
  • PARN participates in diverse physiological processes by regulating mRNA fates through deadenylation
  • self-association may likely facilitate PARN to concentrate around the target mRNAs by restricted diffusion
  • new role for PARN in the biogenesis of TERC, providing a mechanism linking PARN mutations to telomere diseases
  • PNLDC1 shows limited conservation compared to PARN and represents an evolutionary related but distinct group of enzymes
  • PARN and TOE1 are nuclear granule-associated deadenylases, whose mutations are linked to multiple human diseases
  • CELLULAR PROCESS protein, translation/synthesis
    a component
  • complexing with the cleavage and polyadenylation specific factors CPSF1, CPSF2, CPSF3, CPSF4, CPSF5, CPSF6 and CSTF3
  • PARN is part of the enzymatic machinery that matures the human 18S ribosomal RNA (rRNA)
    small molecule metal binding,
  • iron Fe2+
  • protein
  • interacting with NCBP1, potential regulator of PARN
  • PARN increased TERC levels by deadenylating TERC, thereby limiting its degradation by EXOSC10
  • PARN downregulates PLD2 whereas PLD2 upregulates PARN
  • ELAVL1 and PARN destabilize Cat2 transcribed nuclear RNA (Ctn RNA) in absence of ADARB1, indicating that ADAR2 stabilizes Ctn RNA by antagonizing its degradation by PARN and ELAVL1
  • NCL phosphorylation offers specificity to its protein-protein, protein-RNA interactions, resulting in the PARN deadenylase regulation, and hence gene expression, during cellular stress responses
  • cell & other
    activated by stimulated by the presence of an m(7)-guanine cap on substrate RNAs
    corresponding disease(s) DKCB6
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    constitutional       loss of function
    PARN deficiency leads to human telomerase RNA instability
    tumoral     --over  
    increased levels of PARN and NOCT correlate with significantly increased survival in squamous cell lung cancer
  • to idiopathic pulmonary fibrosis (IPF)
  • Variant & Polymorphism other
  • mutation carriers had shortened leukocyte telomere lengths, and explain ~7p100 of familial pulmonary fibrosis
  • Candidate gene
    Therapy target