REG4

gene
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Also known as REG-IVRELPGISP

Summary

REG4 (regenerating family member 4, HGNC:22977) is a protein-coding gene on chromosome 1p12, encoding Regenerating islet-derived protein 4 (Q9BYZ8). Calcium-independent lectin displaying mannose-binding specificity and able to maintain carbohydrate recognition activity in an acidic environment.

Enables heparin binding activity and mannan binding activity. Predicted to act upstream of or within response to bacterium. Located in cytoplasm.

Source: NCBI Gene 83998 — RefSeq curated summary.

At a glance

  • GWAS associations: 1
  • Clinical variants (ClinVar): 34 total
  • MANE Select transcript: NM_032044

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:22977
Approved symbolREG4
Nameregenerating family member 4
Location1p12
Locus typegene with protein product
StatusApproved
AliasesREG-IV, RELP, GISP
Ensembl geneENSG00000134193
Ensembl biotypeprotein_coding
OMIM609846
Entrez83998

Gene structure

Transcript identifiers

Ensembl transcripts: 5 — 5 protein_coding

ENST00000256585, ENST00000354219, ENST00000369401, ENST00000530654, ENST00000871091

RefSeq mRNA: 3 — MANE Select: NM_032044 NM_001159352, NM_001159353, NM_032044

CCDS: CCDS53354, CCDS906

Canonical transcript exons

ENST00000256585 — 6 exons

ExonStartEnd
ENSE00000913356119803068119803165
ENSE00000913357119799725119799862
ENSE00000913358119798497119798602
ENSE00001022832119808703119808863
ENSE00001353646119794017119794685
ENSE00001883368119811409119811460

Expression profiles

Bgee: expression breadth ubiquitous, 115 present calls, max score 99.92.

FANTOM5 (CAGE): breadth tissue_specific, TPM avg 0.7725 / max 435.7278, expressed in 25 samples.

FANTOM5 promoters (1 alternative TSS)

Promoter IDTPM avgSamples expressed
140920.772525

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
ileal mucosaUBERON:000033199.92gold quality
duodenumUBERON:000211498.41gold quality
jejunal mucosaUBERON:000039998.22gold quality
body of pancreasUBERON:000115096.39gold quality
small intestine Peyer’s patchUBERON:000345494.85gold quality
mucosa of sigmoid colonUBERON:000499394.33gold quality
rectumUBERON:000105293.42gold quality
small intestineUBERON:000210892.99gold quality
colonic mucosaUBERON:000031791.37gold quality
pancreatic ductal cellCL:000207990.85gold quality
vermiform appendixUBERON:000115490.08gold quality
pancreasUBERON:000126486.76gold quality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047383.94gold quality
mucosa of transverse colonUBERON:000499183.49gold quality
caecumUBERON:000115380.70gold quality
jejunumUBERON:000211578.61gold quality
intestineUBERON:000016073.27gold quality
tibialis anteriorUBERON:000138571.98silver quality
transverse colonUBERON:000115771.91gold quality
islet of LangerhansUBERON:000000671.40gold quality
cardiac muscle of right atriumUBERON:000337970.97gold quality
epithelial cell of pancreasCL:000008370.84silver quality
left ventricle myocardiumUBERON:000656670.77gold quality
large intestineUBERON:000005966.42gold quality
myocardiumUBERON:000234966.05gold quality
kidney epitheliumUBERON:000481965.98gold quality
upper arm skinUBERON:000426365.39gold quality
smooth muscle tissueUBERON:000113565.34gold quality
colonUBERON:000115565.17gold quality
colonic epitheliumUBERON:000039764.34gold quality

Single-cell (SCXA)

Detected in 6 experiment(s), a significant marker in 6.

ExperimentMarker?Max mean expression
E-GEOD-125970yes17299.70
E-MTAB-8410yes2847.07
E-MTAB-8495yes1054.57
E-MTAB-9543yes870.31
E-CURD-84yes499.19
E-ANND-3no0.00

Regulation

Is transcription factor: no

Upstream regulators (CollecTRI, top): CDX2, GLI1, TSG101

miRNA regulators (miRDB)

30 targeting REG4, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-3692-3P99.9870.272139
HSA-MIR-6888-3P99.9765.951170
HSA-MIR-3682-5P99.9367.971163
HSA-MIR-432099.7565.80793
HSA-MIR-447099.6669.351767
HSA-MIR-4762-5P99.5768.541424
HSA-MIR-431899.3866.941505
HSA-MIR-450599.2767.812678
HSA-MIR-578799.2267.862628
HSA-MIR-6734-3P99.1566.271627
HSA-MIR-392698.9569.261438
HSA-MIR-4724-5P98.8767.751324
HSA-MIR-4755-3P98.7765.591915
HSA-MIR-6794-3P98.7666.99894
HSA-MIR-950098.6266.541845
HSA-MIR-7114-5P98.5167.871349
HSA-MIR-548S98.5067.171213
HSA-MIR-4722-5P98.4666.341611
HSA-MIR-6826-3P98.1966.321153
HSA-MIR-4664-5P98.1765.071020
HSA-MIR-446898.0166.851187
HSA-MIR-6511B-5P97.9865.64823
HSA-MIR-6811-5P97.9864.96848
HSA-MIR-4433A-3P97.7562.821435
HSA-MIR-4676-5P97.5465.29715
HSA-MIR-57597.5465.18718
HSA-MIR-342-5P97.2564.10817
HSA-MIR-2276-5P96.2765.85937
HSA-MIR-4758-5P94.8267.06499
HSA-MIR-1238-5P94.8267.52493

Literature-anchored findings (GeneRIF, showing 40)

  • Results suggest that RELP might be involved in inflammatory and metaplastic responses of the gastrointestinal epithelium. (PMID:12819006)
  • overexpression of Reg IV may be an early event in colorectal carcinogenesis. (PMID:14550954)
  • Increased expression of Reg IV is associated wirh hormone refractory metastatic prostate cancer (PMID:15788672)
  • RELP serves as a marker for appendiceal mucinous cystadenomas and pseudomyxoma peritonei and may contribute to the pathogenesis of these disorders. (PMID:16323007)
  • Reg IV is a potent activator of the EGF receptor/Akt/AP-1 signaling pathway in colorectal carcinoma (PMID:16401477)
  • Overexpression of REG4 is associated with pancreatic cancer (PMID:16918991)
  • serum Reg IV concentration may predict metastatic recurrence of colorectal cancer in the liver.Reg IV protein expression induced by growth factors may function as a growth-promoting and/or an antiapoptotic factor in the peritumoral mucosa of CRC. (PMID:18187959)
  • RegIV expression was markedly higher in gastric cancer patients with peritoneal metastases compared to those without; level of RegIV mRNA in gastric cancer patients was related to the extent of wall penetration (PMID:18505053)
  • Reg IV staining can aid in diagnosis of gastrointestinal signet ring cell carcinoma. (PMID:18580680)
  • These results suggest that Reg IV expression is an independent prognostic indicator of relapse after radical prostatectomy. (PMID:18754868)
  • Reg IV might accelerate cell growth and disease progression of adenoid cystic carcinomas . (PMID:19076683)
  • among major urologic cancers, Reg IV is expressed frequently in prostate cancer, and that serum Reg IV represents a novel biomarker for prostate cancer (PMID:19082448)
  • REG4 is involved in the ‘intestinal’ pathway of carcinogenesis in intraductal papillary mucinous neoplasms of the pancreas (PMID:19136934)
  • Reg IV might accelerate peritoneal metastasis in gastric cancer. Reg IV in lavage fluids might be a good marker for peritoneal metastasis (PMID:19143768)
  • Expression of REG Ialpha but not REG IV was an independent predictor of poor outcome in patients with gastric cancer. (PMID:19329938)
  • Data demonstrated in vitro and in vivo that REG4 protein overexpression was associated with an unfavorable response to preoperative chemoradiotherapy. (PMID:19546835)
  • Reg IV is involved in gallbladder carcinoma carcinogenesis through intestinal metaplasia and is associated with relatively favorable prognosis in patients after surgery (PMID:19716164)
  • Reg IV expression experienced up-regulation in gastric intestinal metaplasia and adenoma and then down-regulation with malignant transformation of gastric epithelial cells. (PMID:19740514)
  • REG4 is expressed in pancreatic cancer, and serum levels of REG4 offer a useful indicator for distinguishing between patients with pancreatic cancer and healthy subjects (PMID:19789838)
  • reg4 is amplified in the early stages of pancreatic cancer development (PMID:19834624)
  • Reg IV as an important modulator of gastrointestinal cell susceptibility to irradiation; hence, it is a potential target for adjunctive treatments for human colorectal cancer and other gastrointestinal malignancies. (PMID:19900450)
  • Local Reg IV expression may be influenced by the growth factors basic fibroblast growth factor and somatotropin and dtheri receptors (PMID:19924642)
  • REG4 may play an important role in the development and progression of colorectal cancer, as well as in intestinal morphogenesis and epithelium restitution (PMID:20126989)
  • REG IV overexpression may be an early event in colorectal carcinoma carcinogenesis. (PMID:20183800)
  • RegIV is expressed in the gastrointestinal tract and in digestive tract neuroendocrine tumor (PMID:20349522)
  • RegIV enhances LoVo cell migration and invasion, and its CRD domain is critical for these effects. (PMID:20417867)
  • The solution structure of hRegIV-P91S was determined, showing that it adopts a typical fold of C-type lectin. Based on the chemical shift perturbations of amide resonances, two calcium-independent mannan-binding sites were proposed (PMID:20692269)
  • REG4 may be a prognostic indicator and a better serum marker than carcinoembryonic antigen and carbohydrate antigen 19-9 for early diagnosis of gastric cancer. (PMID:21419474)
  • Knockdown of Reg IV impacted the ability of insulin and EGF to stimulate downstream tyrosine phosphorylation. (PMID:21445968)
  • Overexpression of REGIV mRNA is assessed with peritoneal recurrence in gastric adenocarcinoma. (PMID:21780125)
  • REG4, BIRC5 and NEIL2 genes might have a role in the sensitivity of cancer patients to radiotherapy (PMID:22199273)
  • TGF-beta signalling reduces the expression of ALDH1 and REG4, and the size of the ALDH1+ cell population. (PMID:22430847)
  • Suggest that Reg IV might accelerate disease progression and act as a candidate prognostic marker for gliomas. (PMID:22713481)
  • REG4 promotes not only growth but also in vitro invasiveness of pancreatic cancer cells by upregulating MMP-7 and MMP-9. (PMID:22957785)
  • RegIV may play an important role in the intrinsic resistance of gastric cancer cells to 5-FU. (PMID:23010741)
  • CDX2 protein directly regulates Reg IV expression in gastric cancer (PMID:23133598)
  • The Reg IV may be involved in the finetuning of functions exerted by the neuroendocrine cells in the GI-tract. (PMID:23499801)
  • Immunohistochemistry against known cell-type markers on serial sections has localised the expression of REGs to metaplastic Paneth cells (REG1A, REG1B and REG3A) and enteroendocrine cells (REG4), with a marked expansion of expression during inflammation. (PMID:23519454)
  • REG4 expression is common in mucinous borderline ovarian tumors of the intestinal type as it is absent in the endocervical-like form tumors. (PMID:23958547)
  • the stemness properties of control mammospheres and RegIV knockdown mammospheres were compared by tumourigenicity assay in vivo and plate colony formation assay in vitro. (PMID:24064664)

Cross-species orthologs

3 orthologs

OrganismSymbolGene ID
mus_musculusReg4ENSMUSG00000027876
rattus_norvegicusReg4ENSRNOG00000019046
caenorhabditis_elegansWBGENE00019914

Paralogs (5): REG1A (ENSG00000115386), REG3G (ENSG00000143954), REG3A (ENSG00000172016), REG1B (ENSG00000172023), CLEC19A (ENSG00000261210)

Protein

Protein identifiers

Regenerating islet-derived protein 4Q9BYZ8 (reviewed: Q9BYZ8)

Alternative names: Gastrointestinal secretory protein, REG-like protein, Regenerating islet-derived protein IV

All UniProt accessions (2): E9PNV6, Q9BYZ8

UniProt curated annotations — full annotation on UniProt →

Function. Calcium-independent lectin displaying mannose-binding specificity and able to maintain carbohydrate recognition activity in an acidic environment. May be involved in inflammatory and metaplastic responses of the gastrointestinal epithelium.

Subcellular location. Secreted.

Tissue specificity. Highly expressed in the gastrointestinal tract including the duodenum, jejunum, ileum, ileocecum, appendix, descending colon, pancreas and small intestine. Weakly expressed in normal colon and stomach. Strongly expressed in most colorectal tumors than in normal colon. Preferentially expressed in mucinous tumors and in some cases neuro-endocrine tumors. Expressed in mucus-secreting cells and enterocyte-like cells. In small intestine expressed at the basal perinuclear zone of goblet cells.

Induction. Up-regulated by mucosal injury from active Crohn’s disease or ulcerative colitis. Up-regulated in colorectal tumors. Up-regulated in epithelial cells at regenerating margins of peptic ulcers in the stomach and duodenum.

Isoforms (2)

UniProt IDNamesCanonical?
Q9BYZ8-11yes
Q9BYZ8-22

RefSeq proteins (3): NP_001152824, NP_001152825, NP_114433* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR001304C-type_lectin-likeDomain
IPR016186C-type_lectin-like/link_sfHomologous_superfamily
IPR016187CTDL_foldHomologous_superfamily
IPR018378C-type_lectin_CSConserved_site
IPR050111C-type_lectin/snaclec_domainFamily

Pfam: PF00059

UniProt features (21 total): strand 7, disulfide bond 3, splice variant 2, helix 2, binding site 2, signal peptide 1, chain 1, sequence variant 1, domain 1, glycosylation site 1

Structure

Experimental structures (PDB)

1 structures.

PDBMethodResolution (Å)
2KV3SOLUTION NMR

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9BYZ8-F189.170.77

Functional residue map

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

Ligand- & substrate-binding residues (2): 98–103; 135–137

Disulfide bonds (3): 30–41, 58–154, 129–146

Glycosylation sites (1): 50

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 87 (showing top): WATANABE_COLON_CANCER_MSI_VS_MSS_UP, GATA6_01, GOMF_GLYCOSAMINOGLYCAN_BINDING, chr1p12, GATA1_02, GOMF_HEPARIN_BINDING, GOMF_SULFUR_COMPOUND_BINDING, GOBP_RESPONSE_TO_BACTERIUM, GOMF_POLYSACCHARIDE_BINDING, MARTENS_TRETINOIN_RESPONSE_UP, VECCHI_GASTRIC_CANCER_ADVANCED_VS_EARLY_DN, FEVR_CTNNB1_TARGETS_DN, ANDERSEN_CHOLANGIOCARCINOMA_CLASS2, CEBPE_TARGET_GENES, DLX2_TARGET_GENES

GO Biological Process (1): response to bacterium (GO:0009617)

GO Molecular Function (4): heparin binding (GO:0008201), signaling receptor activity (GO:0038023), mannan binding (GO:2001065), carbohydrate binding (GO:0030246)

GO Cellular Component (2): extracellular region (GO:0005576), cytoplasm (GO:0005737)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure2
response to other organism1
glycosaminoglycan binding1
sulfur compound binding1
molecular transducer activity1
polysaccharide binding1
binding1
intracellular anatomical structure1

Protein interactions and networks

STRING

730 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
REG4TFF3Q07654654
REG4GPR37O15354629
REG4KRT20P35900587
REG4TFF2Q03403540
REG4SPINK4O60575532
REG4LGR5O75473530
REG4MS4A12Q9NXJ0498
REG4EXTL3O43909485
REG4OLFM4Q6UX06483
REG4CLDN18P56856477
REG4MUC2Q02817456
REG4ZG16O60844453
REG4ZC3H12AQ5D1E8445
REG4AGR2O95994439
REG4SPINK8P0C7L1426

IntAct

4 interactions, top by confidence:

ABTypeScore
REG4ATE1psi-mi:“MI:0914”(association)0.530

BioGRID (14): ATE1 (Affinity Capture-MS), HTRA1 (Affinity Capture-MS), UBAC1 (Affinity Capture-MS), KLHL26 (Affinity Capture-MS), SIRT3 (Affinity Capture-MS), RNF123 (Affinity Capture-MS), SIRT3 (Affinity Capture-MS), RNF123 (Affinity Capture-MS), ATE1 (Affinity Capture-MS), HTRA1 (Affinity Capture-MS), PITRM1 (Affinity Capture-MS), KLHL26 (Affinity Capture-MS), UBAC1 (Affinity Capture-MS), KLHL22 (Affinity Capture-MS)

ESM2 similar proteins: A1XXJ9, A7X3X0, A7X3X3, A7X3X8, A7X3Y2, B5U6Y6, D2YVH7, D2YVJ8, D2YVK5, D8VNS6, I7ICN3, O09037, O09049, O93426, O93427, P05451, P0DM38, P10758, P23132, P23807, P25031, P35230, P35231, P42854, P43137, P48304, P81112, P81114, Q06141, Q08731, Q09GJ8, Q09GK0, Q56EB0, Q5FZI6, Q68AX7, Q6TPG9, Q6UW15, Q6X5S0, Q6X5S1, Q6X5S4

Diamond homologs: A1XXJ9, A3FM55, A7X3W1, A7X3W6, A7X3X0, A7X3X3, A7X3X8, A7X3Y2, A7X3Y6, A7X3Z0, A7X3Z4, A7X3Z7, A7X401, A7X406, A7X409, A7X413, B0VXV0, B0VXV1, B5U6Y6, C6JUN9, D1MGU0, D2YVH7, D2YVI2, D2YVJ6, D2YVJ8, D2YVK1, D2YVK5, D2YW40, D8VNS6, I7ICN3, J3S3U6, J3SBP0, O93427, P05451, P07439, P0DL30, P0DM36, P0DM38, P0DM39, P0DM53

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance27
Likely benign2
Benign1

Top pathogenic / likely-pathogenic (0)

SpliceAI

889 predictions. Top by Δscore:

VariantEffectΔscore
1:119794683:AGT:Aacceptor_gain0.9900
1:119794683:AGTC:Aacceptor_loss0.9900
1:119794685:TCT:Tacceptor_loss0.9900
1:119794686:C:CCacceptor_gain0.9900
1:119794687:T:Aacceptor_loss0.9900
1:119803062:TCTTA:Tdonor_loss0.9900
1:119803063:CTTA:Cdonor_loss0.9900
1:119803064:TTACC:Tdonor_loss0.9900
1:119803065:TACCT:Tdonor_loss0.9900
1:119803067:C:CAdonor_loss0.9900
1:119803161:GATAT:Gacceptor_gain0.9900
1:119803162:ATATC:Aacceptor_loss0.9900
1:119803163:TAT:Tacceptor_gain0.9900
1:119803163:TATC:Tacceptor_loss0.9900
1:119803164:ATC:Aacceptor_loss0.9900
1:119803165:TCTGC:Tacceptor_loss0.9900
1:119803166:C:CCacceptor_gain0.9900
1:119803167:T:Aacceptor_loss0.9900
1:119803172:A:Cacceptor_gain0.9900
1:119811403:GATTA:Gdonor_loss0.9900
1:119811404:ATTAC:Adonor_loss0.9900
1:119811406:TA:Tdonor_loss0.9900
1:119811408:C:CAdonor_loss0.9900
1:119811440:G:Adonor_gain0.9900
1:119794681:AAAGT:Aacceptor_gain0.9800
1:119794682:AAGT:Aacceptor_gain0.9800
1:119794684:GT:Gacceptor_gain0.9800
1:119803162:ATAT:Aacceptor_gain0.9700
1:119803164:AT:Aacceptor_gain0.9700
1:119803171:C:CTacceptor_gain0.9700

AlphaMissense

1049 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
1:119798585:C:AW107C0.993
1:119798585:C:GW107C0.993
1:119794634:C:GC154S0.991
1:119794635:A:TC154S0.991
1:119799855:C:GC58S0.991
1:119799856:A:TC58S0.991
1:119803080:C:AW51C0.991
1:119803080:C:GW51C0.991
1:119794639:G:CF152L0.990
1:119794639:G:TF152L0.990
1:119794641:A:GF152L0.990
1:119794672:C:AW141C0.990
1:119794672:C:GW141C0.990
1:119803073:C:GA54P0.990
1:119799749:C:AW93C0.989
1:119799749:C:GW93C0.989
1:119798591:C:AW105C0.987
1:119798591:C:GW105C0.987
1:119799854:A:CC58W0.983
1:119803131:C:AW34C0.982
1:119803131:C:GW34C0.982
1:119798520:C:GC129S0.980
1:119798521:A:TC129S0.980
1:119798587:A:GW107R0.979
1:119798587:A:TW107R0.979
1:119799856:A:GC58R0.979
1:119794658:C:GC146S0.977
1:119794659:A:TC146S0.977
1:119799855:C:TC58Y0.977
1:119803111:C:GC41S0.977

dbSNP variants (sampled 300 via entrez): RS1000000493 (1:119800862 G>A), RS1000019976 (1:119804673 T>C), RS1000079425 (1:119799185 CCA>C), RS1000117501 (1:119801930 G>A,C), RS1000161888 (1:119797781 G>A), RS1000587759 (1:119795032 C>A), RS1000640220 (1:119794850 T>C), RS1000669861 (1:119809341 T>C), RS1000947103 (1:119795133 A>C,G), RS1001198166 (1:119799563 A>G), RS1001221056 (1:119810032 T>C), RS1001274689 (1:119795337 T>C,G), RS1001314148 (1:119799831 T>C), RS1001429235 (1:119794349 T>C), RS1001826166 (1:119805052 C>A)

Disease associations

OMIM: gene MIM:609846 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

1 associations (top):

StudyTraitp-value
GCST006585_2242Blood protein levels2.000000e-09

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

16 total (human), top 16 by PubMed support.

ChemicalActions (top 5)PubMed papers
propionaldehydedecreases expression1
terbufosincreases methylation1
perfluorooctanoic acidincreases expression1
CGP 52608increases reaction, affects binding1
perfluoro-n-nonanoic acidincreases expression1
entinostatincreases expression1
perfluorohexanesulfonic acidincreases expression1
NSC 689534affects binding, decreases expression1
(+)-JQ1 compounddecreases expression1
Arsenicaffects methylation1
Benzo(a)pyreneincreases methylation1
Copperaffects binding, decreases expression1
Fonofosincreases methylation1
Fluorouracildecreases response to substance1
Hydrogen Peroxideaffects expression1
Parathionincreases methylation1

Clinical trials (associated diseases)

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

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.