IKZF5

gene
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Also known as PegasusFLJ22973

Summary

IKZF5 (IKAROS family zinc finger 5, HGNC:14283) is a protein-coding gene on chromosome 10q26.13, encoding Zinc finger protein Pegasus (Q9H5V7). Transcriptional repressor that binds the core 5’GNNTGTNG-3’ DNA consensus sequence.

Members of the Ikaros (ZNFN1A1; MIM 603023) family of transcription factors, which includes Pegasus, are expressed in lymphocytes and are implicated in the control of lymphoid development.

Source: NCBI Gene 64376 — RefSeq curated summary.

At a glance

  • Gene–disease (curated): thrombocytopenia 7 (Strong, GenCC) — +1 more curated relationship
  • Clinical variants (ClinVar): 32 total — 2 pathogenic, 2 likely-pathogenic
  • Phenotypes (HPO): 9
  • MANE Select transcript: NM_001372123

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:14283
Approved symbolIKZF5
NameIKAROS family zinc finger 5
Location10q26.13
Locus typegene with protein product
StatusApproved
AliasesPegasus, FLJ22973
Ensembl geneENSG00000095574
Ensembl biotypeprotein_coding
OMIM606238
Entrez64376

Gene structure

Transcript identifiers

Ensembl transcripts: 17 — 14 protein_coding, 3 protein_coding_CDS_not_defined

ENST00000368886, ENST00000469821, ENST00000479103, ENST00000496605, ENST00000617859, ENST00000904850, ENST00000904851, ENST00000904852, ENST00000904853, ENST00000904854, ENST00000904855, ENST00000904856, ENST00000904857, ENST00000934440, ENST00000934441, ENST00000934442, ENST00000934443

RefSeq mRNA: 10 — MANE Select: NM_001372123 NM_001271840, NM_001372123, NM_001372124, NM_001372125, NM_001372126, NM_001372127, NM_001372128, NM_001372129, NM_001372130, NM_001372131

CCDS: CCDS41574

Canonical transcript exons

ENST00000368886 — 5 exons

ExonStartEnd
ENSE00001016085123007026123007176
ENSE00001448203122990807122994723
ENSE00001889065123008694123008795
ENSE00003550778122995994122996176
ENSE00003643508122998493122998671

Expression profiles

Bgee: expression breadth ubiquitous, 262 present calls, max score 88.97.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 12.6855 / max 215.3042, expressed in 1763 samples.

FANTOM5 promoters (2 alternative TSS)

Promoter IDTPM avgSamples expressed
11177412.30751761
1117730.3780140

Top tissues by expression

280 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
endothelial cellCL:000011588.97gold quality
body of pancreasUBERON:000115086.70gold quality
C1 segment of cervical spinal cordUBERON:000646986.40gold quality
primordial germ cell in gonadCL:0000670 ∩ UBERON:000099186.13gold quality
left ovaryUBERON:000211985.97gold quality
pancreasUBERON:000126485.54gold quality
monocyteCL:000057685.52gold quality
mononuclear cellCL:000084285.38gold quality
islet of LangerhansUBERON:000000685.32gold quality
ovaryUBERON:000099285.24gold quality
leukocyteCL:000073885.20gold quality
spinal cordUBERON:000224085.02gold quality
skin of abdomenUBERON:000141684.87gold quality
mammary ductUBERON:000176584.54gold quality
right lobe of liverUBERON:000111484.35gold quality
germinal epithelium of ovaryUBERON:000130484.26gold quality
right ovaryUBERON:000211884.26gold quality
gastrocnemiusUBERON:000138884.24gold quality
rectumUBERON:000105284.22gold quality
cerebellar hemisphereUBERON:000224584.16gold quality
cerebellar cortexUBERON:000212984.07gold quality
bone marrowUBERON:000237183.88gold quality
tibial nerveUBERON:000132383.83gold quality
muscle of legUBERON:000138383.77gold quality
corpus callosumUBERON:000233683.70gold quality
skin of legUBERON:000151183.52gold quality
right hemisphere of cerebellumUBERON:001489083.51gold quality
mucosa of stomachUBERON:000119983.45gold quality
right lungUBERON:000216783.31gold quality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047383.27gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-ANND-3yes3.80

Regulation

Is transcription factor: yes

Downstream targets (CollecTRI)

1 targets.

TargetRegulation
LNPEPActivation

Literature-anchored findings (GeneRIF, showing 2)

  • IKZF5 is a novel transcriptional regulator of megakaryopoiesis and the eighth transcription factor associated with dominant thrombocytopenia in humans. (PMID:31217188)
  • Highly impaired platelet ultrastructure in two families with novel IKZF5 variants. (PMID:32419556)

Cross-species orthologs

3 orthologs

OrganismSymbolGene ID
danio_rerioikzf5ENSDARG00000056491
mus_musculusIkzf5ENSMUSG00000040167
rattus_norvegicusIkzf5ENSRNOG00000025651

Paralogs (38): ZFX (ENSG00000005889), ZBTB11 (ENSG00000066422), ZFAT (ENSG00000066827), ZFY (ENSG00000067646), ZNF586 (ENSG00000083828), ZNF419 (ENSG00000105136), ZNF549 (ENSG00000121406), ZSCAN20 (ENSG00000121903), ZNF304 (ENSG00000131845), PRDM15 (ENSG00000141956), ZNF660 (ENSG00000144792), ZNF711 (ENSG00000147180), ZNF773 (ENSG00000152439), ZNF256 (ENSG00000152454), ZNF837 (ENSG00000152475), ZNF691 (ENSG00000164011), ZNF610 (ENSG00000167554), E4F1 (ENSG00000167967), ZNF562 (ENSG00000171466), ZNF561 (ENSG00000171469), ZNF584 (ENSG00000171574), ZIK1 (ENSG00000171649), ZNF570 (ENSG00000171827), ZSCAN2 (ENSG00000176371), ZNF552 (ENSG00000178935), ZNF154 (ENSG00000179909), ZNF792 (ENSG00000180884), ZNF793 (ENSG00000188227), ZNF548 (ENSG00000188785), ZNF79 (ENSG00000196152), ZNF418 (ENSG00000196724), ZNF772 (ENSG00000197128), ZNF583 (ENSG00000198440), ZNF480 (ENSG00000198464), ZNF551 (ENSG00000204519), ZNF134 (ENSG00000213762), ZNF587B (ENSG00000269343), ZNF8 (ENSG00000278129)

Protein

Protein identifiers

Zinc finger protein PegasusQ9H5V7 (reviewed: Q9H5V7)

Alternative names: Ikaros family zinc finger protein 5

All UniProt accessions (1): Q9H5V7

UniProt curated annotations — full annotation on UniProt →

Function. Transcriptional repressor that binds the core 5’GNNTGTNG-3’ DNA consensus sequence. Involved in megakaryocyte differentiation.

Subunit / interactions. Self-associates. Interacts with other family members; IKZF1, IKZF2, IKZF3 and IKZF4.

Subcellular location. Nucleus.

Tissue specificity. Expressed in brain, heart, skeletal muscle, kidney, and liver. Expressed in the hematopoietic cell lines MOLT-4, NALM-6 and K-562. Highly expressed in THP-1 and M-07e cell lines, which have characteristics of myeloid and early megakaryocytic cells respectively.

Disease relevance. Thrombocytopenia 7 (THC7) [MIM:619130] A form of thrombocytopenia, a hematologic disorder defined by a decrease in the number of platelets in circulating blood, resulting in the potential for increased bleeding and decreased ability for clotting. THC7 is an autosomal dominant form with highly variable severity, ranging from absence of bleeding symptoms to epistaxis or more severe bleeding episodes. The disease may be caused by variants affecting the gene represented in this entry.

Domain organisation. The N-terminal zinc fingers are involved in sequence-specific DNA binding and heterotypic associations with other family members. C-terminal zinc fingers mediate homodimerization.

Miscellaneous. ‘Pegasus’ was the winged horse in Greek mythology.

Similarity. Belongs to the Ikaros C2H2-type zinc-finger protein family.

RefSeq proteins (10): NP_001258769, NP_001359052, NP_001359053, NP_001359054, NP_001359055, NP_001359056, NP_001359057, NP_001359058, NP_001359059, NP_001359060 (=MANE)

Domains & families (InterPro)

IDNameType
IPR013087Znf_C2H2_typeDomain
IPR036236Znf_C2H2_sfHomologous_superfamily
IPR050589Ikaros_C2H2-ZFFamily

UniProt features (24 total): mutagenesis site 7, zinc finger region 5, compositionally biased region 4, cross-link 2, sequence variant 2, region of interest 2, chain 1, sequence conflict 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9H5V7-F154.370.14

Functional residue map

Curated UniProt residues grouped by drug-discovery relevance — catalytic, ligand-binding, modification, and mutation-validated positions. Source: UniProtKB sequence features.

Post-translational modifications (2): 5, 185

Mutagenesis-validated functional residues (7):

PositionPhenotype
89decreased protein abundance. decreased chromatin binding. decreased localization to the nucleus. tends to remain in the
96decreased protein abundance. decreased chromatin binding. decreased localization to the nucleus. tends to remain in the
98no effect on protein abundance. no effect on chromatin binding. no effect on localization to the nucleus.
134decreased protein abundance. decreased chromatin binding. decreased localization to the nucleus. tends to remain in the
140decreased protein abundance. decreased chromatin binding. decreased localization to the nucleus. tends to remain in the
155decreased protein abundance. decreased chromatin binding. decreased localization to the nucleus. tends to remain in the
200no effect on protein abundance. no effect on chromatin binding. no effect on localization to the nucleus.

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 184 (showing top): YAATNRNNNYNATT_UNKNOWN, SP3_Q3, PAX2_01, WTGAAAT_UNKNOWN, TGIF_01, GARY_CD5_TARGETS_DN, MYOD_Q6, LASTOWSKA_NEUROBLASTOMA_COPY_NUMBER_DN, CUI_TCF21_TARGETS_2_DN, CART1_01, YNGTTNNNATT_UNKNOWN, GOMF_CHROMATIN_BINDING, TAATTA_CHX10_01, AHR_Q5, CAGTGTT_MIR141_MIR200A

GO Biological Process (2): negative regulation of transcription by RNA polymerase II (GO:0000122), regulation of transcription by RNA polymerase II (GO:0006357)

GO Molecular Function (10): RNA polymerase II transcription regulatory region sequence-specific DNA binding (GO:0000977), RNA polymerase II cis-regulatory region sequence-specific DNA binding (GO:0000978), DNA-binding transcription repressor activity, RNA polymerase II-specific (GO:0001227), chromatin binding (GO:0003682), DNA-binding transcription factor activity (GO:0003700), zinc ion binding (GO:0008270), protein domain specific binding (GO:0019904), DNA binding (GO:0003677), protein binding (GO:0005515), metal ion binding (GO:0046872)

GO Cellular Component (2): nucleus (GO:0005634), protein-containing complex (GO:0032991)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
transcription by RNA polymerase II2
regulation of DNA-templated transcription2
transcription cis-regulatory region binding2
RNA polymerase II transcription regulatory region sequence-specific DNA binding2
binding2
regulation of transcription by RNA polymerase II1
negative regulation of DNA-templated transcription1
cis-regulatory region sequence-specific DNA binding1
negative regulation of transcription by RNA polymerase II1
DNA-binding transcription factor activity, RNA polymerase II-specific1
DNA-binding transcription repressor activity1
transcription regulator activity1
transition metal ion binding1
protein binding1
nucleic acid binding1
cation binding1
intracellular membrane-bounded organelle1
cellular_component1

Protein interactions and networks

STRING

826 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
IKZF5IPO11Q9UI26428
IKZF5YEATS2Q9ULM3425
IKZF5SH3BP5LQ7L8J4343
IKZF5PUM3Q15397338
IKZF5CWF19L1Q69YN2328
IKZF5CBFA2T2O43439323
IKZF5SLFN14P0C7P3307
IKZF5HMGN3Q15651302
IKZF5PIDD1Q9HB75297
IKZF5TNPO1Q92973291
IKZF5IKZF3Q9UKT9291
IKZF5CRBNQ96SW2290
IKZF5MED13LQ71F56288
IKZF5YOD1Q5VVQ6282
IKZF5ACADSBP45954281

IntAct

18 interactions, top by confidence:

ABTypeScore
IKZF5IKZF3psi-mi:“MI:0915”(physical association)0.670
IKZF5CCNB1psi-mi:“MI:0914”(association)0.640
IKZF1IKZF5psi-mi:“MI:0915”(physical association)0.550
IKZF5IKZF5psi-mi:“MI:0915”(physical association)0.370
SetZKSCAN1psi-mi:“MI:0914”(association)0.350
IKZF5PEX14psi-mi:“MI:0914”(association)0.350
IKZF1MTA2psi-mi:“MI:0914”(association)0.350
Ppsi-mi:“MI:0914”(association)0.350
NPM1RPS3Apsi-mi:“MI:0914”(association)0.350
IKZF5TADA2Apsi-mi:“MI:0914”(association)0.350
AIM2DDX39Apsi-mi:“MI:0914”(association)0.350
ESR2PSMD11psi-mi:“MI:0914”(association)0.350
LHX3BCL9psi-mi:“MI:2364”(proximity)0.270
IKZF5EEF1Dpsi-mi:“MI:0915”(physical association)0.000

BioGRID (121): IKZF5 (Two-hybrid), IKZF5 (Two-hybrid), IKZF5 (Two-hybrid), IKZF5 (Two-hybrid), IKZF5 (Affinity Capture-MS), CHD8 (Affinity Capture-MS), MIB2 (Affinity Capture-MS), ZC3H3 (Affinity Capture-MS), IKZF2 (Affinity Capture-MS), IKZF3 (Affinity Capture-MS), AHDC1 (Affinity Capture-MS), CCDC77 (Affinity Capture-MS), TCF7L2 (Affinity Capture-MS), ZNF518B (Affinity Capture-MS), ZZZ3 (Affinity Capture-MS)

ESM2 similar proteins: A0JPB4, A1L1J6, A2VDW9, A4IFJ6, O00409, O08876, O08900, O13089, O15060, O15062, O42410, O57415, O60315, O75626, O89091, P14404, P25932, P36197, P37275, P55878, P55879, P81183, Q03267, Q0VDT2, Q13422, Q33BP8, Q3BJS3, Q3UH06, Q499D0, Q5R9W9, Q5T0B9, Q5ZLR2, Q5ZM39, Q60636, Q62255, Q62947, Q64318, Q6DBW0, Q6NRM0, Q6XDT4

Diamond homologs: A0JPB4, A2VDW9, A4IFJ6, H2L008, O08900, O13089, O42410, O62537, O62538, O62541, O96785, P05084, P13361, P81183, Q01778, Q01791, Q03267, Q13422, Q25514, Q5R9W9, Q5ZLR2, Q6DBW0, Q6NRM0, Q6XDT4, Q6XDT6, Q8BU00, Q8C208, Q90ZS6, Q925H1, Q9H2S9, Q9H5V7, Q9UHF7, Q9UKS7, Q9UKT9, Q9BLC4, Q9HCK0, Q5JPB2, Q65XX7, O18326, O46232

SIGNOR signaling

1 interactions.

AEffectBMechanism
IKZF5“up-regulates quantity by expression”LNPEP“transcriptional regulation”

Disease & clinical

Clinical variants and AI predictions

ClinVar

32 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic2
Likely pathogenic2
Uncertain significance15
Likely benign4
Benign1

Top pathogenic / likely-pathogenic (4)

Variant IDHGVSClassification
1684455NM_001372123.1(IKZF5):c.463C>T (p.His155Tyr)Pathogenic
1684456NM_001372123.1(IKZF5):c.418T>C (p.Cys140Arg)Pathogenic
1703863NM_001372123.1(IKZF5):c.362A>T (p.Tyr121Phe)Likely pathogenic
2671954NM_001372123.1(IKZF5):c.296_300delinsTGTGGATT (p.Glu99_His100delinsValTrpIle)Likely pathogenic

SpliceAI

1032 predictions. Top by Δscore:

VariantEffectΔscore
10:122995988:CATTA:Cdonor_loss1.0000
10:122995992:ACC:Adonor_loss1.0000
10:122995993:CC:Cdonor_loss1.0000
10:122996172:TCCAG:Tacceptor_gain1.0000
10:122996173:CCAG:Cacceptor_gain1.0000
10:122996173:CCAGC:Cacceptor_gain1.0000
10:122996174:CAG:Cacceptor_gain1.0000
10:122996174:CAGC:Cacceptor_gain1.0000
10:122996175:AG:Aacceptor_gain1.0000
10:122996177:C:CCacceptor_gain1.0000
10:122996179:A:Cacceptor_gain1.0000
10:122996184:C:CTacceptor_gain1.0000
10:122996185:A:Tacceptor_gain1.0000
10:122996188:G:Cacceptor_gain1.0000
10:122996192:C:CTacceptor_gain1.0000
10:122996192:C:Tacceptor_gain1.0000
10:122998494:T:TAdonor_gain1.0000
10:123008689:CTTA:Cdonor_loss1.0000
10:123008690:TTACC:Tdonor_loss1.0000
10:123008691:TACC:Tdonor_loss1.0000
10:123008692:A:ACdonor_gain1.0000
10:123008692:ACCT:Adonor_gain1.0000
10:123008693:C:CCdonor_gain1.0000
10:123008693:CCT:Cdonor_gain1.0000
10:123008693:CCTC:Cdonor_gain1.0000
10:122994720:TCACC:Tacceptor_loss0.9900
10:122994722:ACC:Aacceptor_loss0.9900
10:122994723:CCTGT:Cacceptor_loss0.9900
10:122994724:C:CGacceptor_loss0.9900
10:122994725:T:Cacceptor_loss0.9900

AlphaMissense

2807 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
10:122994605:G:CF145L1.000
10:122994605:G:TF145L1.000
10:122994607:A:GF145L1.000
10:122994622:A:GC140R1.000
10:122994651:C:GR130P1.000
10:122994658:G:CH128D1.000
10:122994666:A:GL125P1.000
10:122994689:A:CF117L1.000
10:122994689:A:TF117L1.000
10:122994691:A:GF117L1.000
10:122994695:A:CC115W1.000
10:122994697:A:GC115R1.000
10:122994706:A:GC112R1.000
10:122996010:G:CH100Q1.000
10:122996010:G:TH100Q1.000
10:122996020:A:GL97P1.000
10:122996049:G:CC87W1.000
10:122996060:A:GC84R1.000
10:122993860:A:GC394R0.999
10:122993942:G:CC366W0.999
10:122993944:A:GC366R0.999
10:122994574:G:CH156D0.999
10:122994582:A:GL153S0.999
10:122994599:G:CC147W0.999
10:122994601:A:GC147R0.999
10:122994606:A:GF145S0.999
10:122994611:A:CC143W0.999
10:122994612:C:TC143Y0.999
10:122994613:A:GC143R0.999
10:122994620:A:CC140W0.999

dbSNP variants (sampled 300 via entrez): RS1000031405 (10:123004933 A>C,G), RS1000048298 (10:123002806 C>A), RS1000547978 (10:123004586 C>T), RS1000587053 (10:122991926 T>A), RS1000860936 (10:122999707 A>G,T), RS1000872216 (10:123006312 G>A,C), RS1001205784 (10:122991178 C>G,T), RS1001243828 (10:122998095 C>A,T), RS1001300456 (10:122990343 T>A,C), RS1001314278 (10:122997774 T>A), RS1001440292 (10:123006523 ATCTTCCT>A), RS1001472198 (10:123004757 T>A,C), RS1001603438 (10:123005060 G>A,T), RS1001773684 (10:122990661 G>A), RS1001881864 (10:122998217 T>C)

Disease associations

OMIM: gene MIM:606238 | disease phenotypes: MIM:610006, MIM:619130, MIM:618250

GenCC curated gene-disease

DiseaseClassificationInheritance
thrombocytopenia 7StrongAutosomal dominant
autosomal thrombocytopenia with normal plateletsSupportiveAutosomal dominant

ClinGen Gene-Disease Validity (1)

Expert-panel classifications — Definitive > Strong > Moderate > Limited > Disputed > Refuted.

DiseaseClassificationInheritance
thrombocytopenia 7ModerateAD

Mondo (4): 2-methylbutyryl-CoA dehydrogenase deficiency (MONDO:0012392), thrombocytopenia 7 (MONDO:0030867), mitochondrial complex I deficiency, nuclear type 29 (MONDO:0032633), (MONDO:0015679)

Orphanet (1): 2-methylbutyryl-CoA dehydrogenase deficiency (Orphanet:79157)

HPO phenotypes

9 total (9 of 9 shown, HPO-id order):

HPOTerm
HP:0000006Autosomal dominant inheritance
HP:0001873Thrombocytopenia
HP:0004866Impaired ADP-induced platelet aggregation
HP:0008320Impaired collagen-induced platelet aggregation
HP:0011870Impaired arachidonic acid-induced platelet aggregation
HP:0011871Impaired ristocetin-induced platelet aggregation
HP:0011891Post-partum hemorrhage
HP:0033535Reduced platelet dense granules
HP:0033536Reduced platelet alpha granules

GWAS associations

0 associations (top):

MeSH disease descriptors (1)

DescriptorNameTree numbers
C5664872-Methylbutyryl-CoA Dehydrogenase Deficiency (supp.)

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

29 total (human), top 29 by PubMed support.

ChemicalActions (top 5)PubMed papers
Cyclosporineincreases expression3
Cisplatindecreases expression, increases expression2
Valproic Acidaffects expression, decreases expression2
GSK-J4increases expression1
TAK-243decreases sumoylation1
methylmercuric chloridedecreases expression1
beta-lapachoneincreases expression, decreases expression1
sodium arseniteaffects cotreatment, increases abundance, increases expression1
manganese chlorideaffects cotreatment, increases abundance, increases expression1
resorcinoldecreases expression1
di-n-butylphosphoric acidaffects expression1
cylindrospermopsinincreases expression1
dimethylarsinous acidincreases expression1
abrineincreases expression1
Sunitinibincreases expression1
Zoledronic Aciddecreases expression1
Acetaminophenincreases expression1
Air Pollutantsaffects expression, increases abundance1
Air Pollutants, Occupationalaffects expression1
Arsenicincreases expression, affects cotreatment, increases abundance1
Benzo(a)pyreneaffects methylation1
Doxorubicindecreases expression1
Manganeseaffects cotreatment, increases abundance, increases expression1
Ozoneaffects expression, increases abundance1
Urethaneincreases expression1
Aflatoxin B1decreases methylation1
Asbestos, Crocidoliteincreases expression1
Antirheumatic Agentsincreases expression1
Copper Sulfateincreases expression1

Cellosaurus cell lines

3 cell lines: 3 embryonic stem cell

First 10 cell lines (id-ordered, not curated):

CellosaurusNameCategorySex
CVCL_A3E1SEES3-1V human IKZF5, clone1Embryonic stem cellMale
CVCL_A3E2SEES3-1V human IKZF5, clone2Embryonic stem cellMale
CVCL_A3E3SEES3-1V human IKZF5, clone3Embryonic stem cellMale

Clinical trials (associated diseases)

1 trials via MONDO — disease-level, not drug-specific.

TrialPhaseStatusTitle
NCT05910151Not specifiedUNKNOWNSelective Screening of Children for Hereditary Metabolic Diseases by Tandem Mass Spectrometry in Kazakhstan