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Symbol INPP4B contributors: mct - updated : 14-04-2014
HGNC name inositol polyphosphate-4-phosphatase, type II, 105kDa
HGNC id 6075
Location 4q31.11      Physical location : 142.949.183 - 143.767.604
Synonym symbol(s) MGC132014
TYPE functioning gene
STRUCTURE 818.42 kb     27 Exon(s)
10 Kb 5' upstream gene genomic sequence study
MAPPING cloned Y linked N status provisional
Physical map
LOC152594 4q28.3 similar to ART-4 protein CCRN4L 4q28.3 CCR4 carbon catabolite repression 4-like (S. cerevisiae) ELF2 4q28 E74-like factor 2 (ets domain transcription factor) LOC389224 4 hypothetical gene supported by AK097799 OSAP 4q31.1 ovary-specific acidic protein NDUFC1 4q28.2-q28.3 NADH dehydrogenase (ubiquinone) 1, subcomplex unknown, 1, 6kDa TBDN100 4q31.1 transcriptional coactivator tubedown-100 RAB33B 4q28 RAB33B, member RAS oncogene family SET7 4q28 SET domain-containing protein 7 MGST2 4q28-q31 microsomal glutathione S-transferase 2 MAML3 4q28 mastermind-like 3 (Drosophila) SCOC 4q28.3 short coiled-coil protein LOC391702 4 similar to ribosomal protein L14; 60S ribosomal protein L14 CLGN 4q28.3-q31.1 calmegin LOC152586 4q31.1 similar to RIKEN cDNA 4933434I20 MGC10084 4q31.1 hypothetical protein MGC10084 UCP1 4q28-q31 uncoupling protein 1 (mitochondrial, proton carrier) KIAA0882 4q31.1 KIAA0882 protein LOC389225 4 LOC389225 LOC389226 4 similar to ring finger protein 130; g1-related zinc finger protein RNF150 4q31.1 ring finger protein 150 LOC389227 4 LOC389227 ZNF330 4q31.1-q31.2 LOC389227 LOC389228 4 similar to GRIK2 protein IL15 4q31 interleukin 15 INPP4B 4q31.11 inositol polyphosphate-4-phosphatase, type II, 105kDa USP38 4q31.1 ubiquitin specific protease 38 GAB1 4q31.4-q13.5 GRB2-associated binding protein 1 SMARCA5 4q31.1-q31.2 SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a, member 5 LOC389229 4 similar to Beta-glucuronidase precursor (Beta-G1) LOC166752 4q31.1 similar to embryonic blastocoelar extracellular matrix protein precursor GYPE 4q31 glycophorin E LOC152891 4q31.1 similar to WW45 protein GYPB 4q28-q31 glycophorin B (includes Ss blood group) GYPA 4q28.2-31.1 glycophorin A (includes MN blood group) LOC391703 4 similar to Keratin, type I cytoskeletal 18 (Cytokeratin 18) (K18) (CK 18) HHIP 4q28-q32 hedgehog interacting protein LOC345041 4q31.21 similar to 60 kDa heat shock protein, mitochondrial precursor (Hsp60) (60 kDa chaperonin) (CPN60) (Heat shock protein 60) (HSP-60) (Mitochondrial matrix protein P1) (P60 lymphocyte protein) (HuCHA60) APC10 4q31 similar to 60 kDa heat shock protein, mitochondrial precursor (Hsp60) (60 kDa chaperonin) (CPN60) (Heat shock protein 60) (HSP-60) (Mitochondrial matrix protein P1) (P60 lymphocyte protein) (HuCHA60) ABCE1 4q31 ATP-binding cassette, sub-family E (OABP), member 1 HSHIN1 4q31.21 HIV-1 induced protein HIN-1 LOC389230 4 LOC389230 LOC152905 4q31.21 similar to Reticulon protein 3 (Neuroendocrine-specific protein-like 2) (NSP-like protein II) (NSPLII) FLJ13262 4q31.21 hypothetical protein FLJ13262 MADH1 4q28 MAD, mothers against decapentaplegic homolog 1 (Drosophila) DKFZP586M0622
TRANSCRIPTS type messenger
text variants 1 and 2 encode the same protein
identificationnb exonstypebpproduct
ProteinkDaAAspecific expressionYearPubmed
27 - 4140 105 924 - 2013 24070612
26 - 4041 105 924 - 2013 24070612
Type ubiquitous
   expressed in (based on citations)
SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
Cardiovascularheart   highly
Digestiveliver   lowly
Nervousbrain   moderately
Respiratorylung   moderately
Urinarykidney   moderately
cell lineage
cell lines
physiological period pregnancy
Text placenta
  • phosphatase domains are located within the C-terminus, with mostly alpha-helices
  • a CX5R (active site consensus sequence Cys-Xaa5-Arg) catalytic motif characteristic of dual-specificity phosphatases, such as PTEN
  • different AAs within the catalytic site of INPP4B are responsible for activity with lipid and protein substrates and for substrate specificity
    interspecies ortholog to murine Inpp4b alpha
    homolog to rattus Inpp4b
  • inositol-3,4-bisphosphate 4-phosphatase family
  • CATEGORY enzyme , tumor suppressor , signaling
    SUBCELLULAR LOCALIZATION     intracellular
    basic FUNCTION
  • removing the phosphate group at position 4 of the inositol ring from inositol 3,4-bisphosphate, 1,3,4-trisphosphate and phosphatidylinositol 3,4-bisphosphate
  • has potentially protein tyrosine phosphatase (PTP) activity 2)
  • major modulator of the osteoclast differentiation and as a gene linked to variability of bone mineral density
  • negative modulator of osteoclast differentiation
  • is an important regulator of phosphatidyl-inositol signaling in the cell
  • both PTEN and INPP4B are dual specificity phosphatases and tumor suppressors
  • regulates PI3K/Akt signaling and exerts a tumor suppressor effect, impacting the proliferative, invasive, and tumorigenic capacity of melanoma cells
    metabolism lipid/lipoprotein
    signaling signal transduction
    a component
    small molecule
    cell & other
    corresponding disease(s)
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    tumoral     --low  
    associated with poor outcomes for breast, prostate, and ovarian cancer
    tumoral     --low  
    hyperactivation of the PI3K/AKT pathway caused by the decrease in INPP4B in granulosa cells promotes an ovarian environment defective in folliculogenesis and conducive to teratoma formation
    tumoral   LOH    
    in a majority of basal-like breast cancers, as well as in a significant fraction of ovarian cancers, which correlated with lower overall patient survival
    Variant & Polymorphism
    Candidate gene
    Marker prognostic locus for human osteoporosis
    Therapy target