CALR

gene
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Also known as ROSSAcC1qRCRTFLJ26680CALR1

Summary

CALR (calreticulin, HGNC:1455) is a protein-coding gene on chromosome 19p13.13, encoding Calreticulin (P27797). Calcium-binding chaperone that promotes folding, oligomeric assembly and quality control in the endoplasmic reticulum (ER) via the calreticulin/calnexin cycle. In precision oncology, CALR EXON 9 FRAMESHIFT confers sensitivity to Peginterferon Alfa-2a in Essential Thrombocythemia (CIViC Level B).

Calreticulin is a highly conserved chaperone protein which resides primarily in the endoplasmic reticulum, and is involved in a variety of cellular processes, among them, cell adhesion. Additionally, it functions in protein folding quality control and calcium homeostasis. Calreticulin is also found in the nucleus, suggesting that it may have a role in transcription regulation. Systemic lupus erythematosus is associated with increased autoantibody titers against calreticulin. Recurrent mutations in calreticulin have been linked to various neoplasms, including the myeloproliferative type.

Source: NCBI Gene 811 — RefSeq curated summary.

At a glance

  • GWAS associations: 4
  • Clinical variants (ClinVar): 96 total — 1 pathogenic
  • Phenotypes (HPO): 84
  • Druggable target: yes
  • Precision-oncology evidence (CIViC): 1 curated variant–drug association
  • MANE Select transcript: NM_004343

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:1455
Approved symbolCALR
Namecalreticulin
Location19p13.13
Locus typegene with protein product
StatusApproved
AliasesRO, SSA, cC1qR, CRT, FLJ26680, CALR1
Ensembl geneENSG00000179218
Ensembl biotypeprotein_coding
OMIM109091
Entrez811

Gene structure

Transcript identifiers

Ensembl transcripts: 17 — 12 protein_coding, 3 retained_intron, 2 nonsense_mediated_decay

ENST00000316448, ENST00000586760, ENST00000586803, ENST00000586967, ENST00000587486, ENST00000588454, ENST00000590325, ENST00000680816, ENST00000861560, ENST00000929786, ENST00000929787, ENST00000929788, ENST00000929789, ENST00000929790, ENST00000929791, ENST00000929792, ENST00000957023

RefSeq mRNA: 1 — MANE Select: NM_004343 NM_004343

CCDS: CCDS12288

Canonical transcript exons

ENST00000316448 — 9 exons

ExonStartEnd
ENSE000012555371294353712943629
ENSE000012555471294074412940887
ENSE000012555581294054112940654
ENSE000012555671294024312940452
ENSE000012556011294371312944489
ENSE000012556091293860912938770
ENSE000035571481294005312940147
ENSE000036433631293942812939631
ENSE000036847971293913412939235

Expression profiles

Bgee: expression breadth ubiquitous, 289 present calls, max score 99.80.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 1492.0951 / max 9312.6897, expressed in 1828 samples.

FANTOM5 promoters (4 alternative TSS)

Promoter IDTPM avgSamples expressed
1740391484.31111828
1740494.34981484
1740423.06671492
1740500.3675135

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
stromal cell of endometriumCL:000225599.80gold quality
left lobe of thyroid glandUBERON:000112099.64gold quality
right lobe of thyroid glandUBERON:000111999.62gold quality
thyroid glandUBERON:000204699.56gold quality
islet of LangerhansUBERON:000000699.52gold quality
smooth muscle tissueUBERON:000113599.44gold quality
adenohypophysisUBERON:000219699.42gold quality
colonic epitheliumUBERON:000039799.34gold quality
rectumUBERON:000105299.33gold quality
upper lobe of left lungUBERON:000895299.29gold quality
mucosa of transverse colonUBERON:000499199.25gold quality
right lobe of liverUBERON:000111499.24gold quality
granulocyteCL:000009499.20gold quality
ascending aortaUBERON:000149699.20gold quality
thoracic aortaUBERON:000151599.18gold quality
left uterine tubeUBERON:000130399.17gold quality
right ovaryUBERON:000211899.16gold quality
left ovaryUBERON:000211999.16gold quality
body of pancreasUBERON:000115099.14gold quality
ventricular zoneUBERON:000305399.14gold quality
right coronary arteryUBERON:000162599.13gold quality
minor salivary glandUBERON:000183099.13gold quality
adrenal tissueUBERON:001830399.13gold quality
metanephros cortexUBERON:001053399.12gold quality
gall bladderUBERON:000211099.11gold quality
olfactory segment of nasal mucosaUBERON:000538699.10gold quality
left adrenal gland cortexUBERON:003582599.10gold quality
endocervixUBERON:000045899.08gold quality
left adrenal glandUBERON:000123499.08gold quality
body of uterusUBERON:000985399.06gold quality

Single-cell (SCXA)

Detected in 19 experiment(s), a significant marker in 13.

ExperimentMarker?Max mean expression
E-MTAB-9154yes3160.57
E-HCAD-24yes2575.79
E-MTAB-10042yes1950.88
E-MTAB-9067yes1928.56
E-MTAB-9801yes1479.82
E-HCAD-6yes1111.64
E-MTAB-9467yes48.32
E-CURD-112yes35.09
E-CURD-46yes30.86
E-CURD-122yes23.09
E-HCAD-9yes20.07
E-GEOD-135922yes10.29
E-HCAD-13no2759.32
E-GEOD-76312no1494.60
E-CURD-7no1438.18

Regulation

Is transcription factor: no

Upstream regulators (CollecTRI, top): AR, ATF6, E2F1, E2F4, ESR1, GATA3, GATA6, MECOM, MEF2C, NKX2-5, NR2F1, PPARA, PPARD, PPARG, TCF3, TFAP2A, TTF1, YY1

miRNA regulators (miRDB)

53 targeting CALR, 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-4262100.0073.263931
HSA-MIR-3646100.0073.565283
HSA-MIR-6870-5P99.9968.552115
HSA-MIR-366299.9973.825684
HSA-MIR-181A-5P99.9972.962995
HSA-MIR-181B-5P99.9972.972996
HSA-MIR-181C-5P99.9972.952996
HSA-MIR-181D-5P99.9973.042997
HSA-MIR-4650-5P99.9864.69999
HSA-MIR-477599.9875.006394
HSA-MIR-314899.9775.066478
HSA-MIR-4723-5P99.9768.702034
HSA-MIR-569899.9768.492029
HSA-MIR-7111-5P99.9768.482062
HSA-MIR-568099.9169.833421
HSA-MIR-4731-5P99.8967.232537
HSA-MIR-430299.8967.941187
HSA-MIR-612499.8769.783551
HSA-MIR-6875-3P99.8270.262983
HSA-MIR-57799.7869.132479
HSA-MIR-442899.7366.411733
HSA-MIR-149-3P99.7268.223963
HSA-MIR-317599.6566.302031
HSA-MIR-6512-3P99.6566.071468
HSA-MIR-6720-5P99.6566.221459
HSA-MIR-875-3P99.6369.472548
HSA-MIR-3136-3P99.5766.59781
HSA-MIR-7155-3P99.5766.48794
HSA-MIR-2116-5P99.3269.341273
HSA-MIR-472199.2666.05818

Literature-anchored findings (GeneRIF, showing 40)

  • location was observed on or near the cell surface suggesting it might participate in surface membrane transport of iron (PMID:11891802)
  • Regulation of expression during induction of differentiation in human myeloid cells; evidence for remodeling of the endoplasmic reticulum (PMID:12065601)
  • Anti-adhesive activity of thrombospondin is mediated by the N-terminal domain of the cell surface protein (PMID:12147682)
  • role in class I loading process (PMID:12235131)
  • Data show that CD1d associates in the ER with both calnexin and calreticulin and with the thiol oxidoreductase ERp57 in a manner dependent on glucose trimming of its N-linked glycans. (PMID:12239218)
  • Calreticulin interacts with C/EBPalpha and C/EBPbeta mRNAs and represses translation of C/EBP proteins. (PMID:12242300)
  • role in calcium homeostasis and apoptosis (PMID:12324449)
  • Physical and functional interaction between cell-surface calreticulin and the collagen receptors integrin alpha2beta1 and glycoprotein VI in human platelets (PMID:12362238)
  • Maturation-dependent expression of this protein in monocyte-derived dendritic cells. (PMID:12538033)
  • Dengue 4 virus minus strand 3’UTR RNA binds with calreticulin in human monocytes (PMID:12584332)
  • CD59 is an adaptor for ecto-calreticulin in neutrophils (PMID:12646570)
  • identification as a nuclear matrix protein associated with human colon cancer (PMID:12704787)
  • disease specific antigenic epitopes on CRT molecule, predominantly recognised by IgA Ab of patients suffering from a particular disease (PMID:14624761)
  • calreticulin is expressed in melanoma cells of primary as well as of metastatic lesions and may not have the same causative role as calnexin in melanoma metastasis (PMID:14732231)
  • the contribution of both the b and b’ domains of ER-60 to the binding with calnexin and calreticulin was revealed (PMID:15236594)
  • the lectin site of CRT is the main target for gentamicin binding (PMID:15351734)
  • A polypeptide binding conformation of CALR is induced by deletion of the C-terminal acidic region. (PMID:15383281)
  • conclude that calreticulin promotes the folding of human leukocyte antigen class I molecules to a state in which, at low temperature, they spontaneously acquire peptide binding capacity (PMID:15494401)
  • Up-regulation of calreticulin is associated with bladder cancer (PMID:15596044)
  • The thrombospondin-1 (TSP-1) binding site in calreticulin, spanning residues 19-36, augments the expression of TSP-1 and is a potent triggering factor for T cell migration. (PMID:15634883)
  • modulation of CEBPA by calreticulin represents a novel mechanism involved in the differentiation block in CBFB-SMMHC AML. (PMID:15855281)
  • Our study has identified, by immunoprecipitation and direct protein sequencing (LC/MS/MS), binding of CD69 to an N-terminal protein fragment of calreticulin expressed on the cell surface of human PBMCs. (PMID:15893733)
  • C1q functions as a chemotactic factor for immature dendritic cells, and migration is mediated through ligation of both gC1qR and cC1qR/CR. (PMID:16140380)
  • single C-terminal alpha-helix was of major importance to the conformational stability of calreticulin (PMID:16522185)
  • CRT in the post-endoplasmic reticulum compartments may act as a negative regulator of the cell surface CFTR (PMID:16527813)
  • These results indicate that the calcium- and zinc-responsive regions of calreticulin reside strictly in the N-/C-domain. (PMID:16542777)
  • Novel mechanism by which calareticulin is involved in the regulation of radiosensitivity and radiation-induced apoptosis in malignant glioma cells. (PMID:16951181)
  • Calreticulin/NY-ESO-1 interactions provide a direct link between NY-ESO-1, the innate immune system and, potentially, the adaptive immune response against NY-ESO-1. (PMID:16951317)
  • CRT is located on the surface of metaphase chromosomes (PMID:16974078)
  • Phospholamban in the human esophagus might be of less importance for regulation of SERCA than in heart. Lower expression of calsequestrin and calreticulin might contribute to increased lower esophageal sphincter pressure in achalasia. (PMID:17009399)
  • These results show that Calreticulin is likely to play a pivotal role in the differentiation of human colonic adenocarcinomas. (PMID:17390051)
  • calreticulin has a peptide-binding specificity for hydrophobic sequences (PMID:17499031)
  • CALR and Hsp90 stabilize INSR. (PMID:17563366)
  • Two novel mutations in the CALR gene were identified. (PMID:17655857)
  • cell surface calreticulin, a known innate immunity receptor, which has been previously proposed as a culprit in autoimmunity, plays a critical role in shared epitope-triggered signal transduction. (PMID:17947714)
  • Calreticulin stimulates the anti-oxidant pathway and contributes to short-term hypoxia-induced protection in A549 type II alveolar epithelial cells. (PMID:17959730)
  • Calreticulin expression in the clonal plasma cells of patients with systemic light-chain (AL-) amyloidosis is associated with response to high-dose melphalan (PMID:17982021)
  • These findings suggest that Ro52 plays a significant role in quality control of IgG1 through the endoplasmic reticulum associated degradation system. (PMID:18022694)
  • Data show that the potential MBL co-receptor calreticulin binds to MBL at the MASP binding site and the interaction may involve a conformational change in MBL. (PMID:18177377)
  • interaction of calreticulin with amyloid beta (Abeta) was investigated; calreticulin bound Abeta 1-42 in a time and concentration dependent fashion (PMID:18221019)

Cross-species orthologs

4 orthologs

OrganismSymbolGene ID
danio_reriocalrENSDARG00000076290
mus_musculusCalrENSMUSG00000003814
rattus_norvegicusCalrENSRNOG00000003029
caenorhabditis_elegansWBGENE00000802

Paralogs (3): CANX (ENSG00000127022), CLGN (ENSG00000153132), CALR3 (ENSG00000269058)

Protein

Protein identifiers

CalreticulinP27797 (reviewed: P27797)

Alternative names: CRP55, Calregulin, Endoplasmic reticulum resident protein 60, HACBP, grp60

All UniProt accessions (6): A0A7P0T861, K7EJB9, K7EL50, K7ELE2, P27797, V9HW88

UniProt curated annotations — full annotation on UniProt →

Function. Calcium-binding chaperone that promotes folding, oligomeric assembly and quality control in the endoplasmic reticulum (ER) via the calreticulin/calnexin cycle. This lectin interacts transiently with almost all of the monoglucosylated glycoproteins that are synthesized in the ER. Interacts with the DNA-binding domain of NR3C1 and mediates its nuclear export. Involved in maternal gene expression regulation. May participate in oocyte maturation via the regulation of calcium homeostasis. Present in the cortical granules of non-activated oocytes, is exocytosed during the cortical reaction in response to oocyte activation and might participate in the block to polyspermy.

Subunit / interactions. Monomer. Component of an EIF2 complex at least composed of CELF1/CUGBP1, CALR, CALR3, EIF2S1, EIF2S2, HSP90B1 and HSPA5. Interacts with PDIA3/ERp57 and SPACA9. Interacts with TRIM21. Interacts with NR3C1. Interacts with PPIB. Interacts (via P-domain) with PDIA5. Interacts with GABARAP. Interacts with HLA-E-B2M and HLA-G-B2M complexes. Interacts with HLA-F. Interacts with CLCC1.

Subcellular location. Endoplasmic reticulum lumen. Cytoplasm. Cytosol. Secreted. Extracellular space. Extracellular matrix. Cell surface. Sarcoplasmic reticulum lumen. Cytoplasmic vesicle. Secretory vesicle. Cortical granule. Cytolytic granule.

Disease relevance. CALR somatic mutations are frequently found in myeloproliferative neoplasms lacking JAK2 or MPL mutations. Myeloproliferative neoplasms are chronic myeloid cancers characterized by overproduction of mature blood cells, and may evolve into acute myeloid leukemia. In addition to chronic myeloid leukemia with the BCR-ABL fusion gene, the three most common myeloproliferative neoplasms are essential thrombocythemia, polycythemia vera, and myelofibrosis.

Domain organisation. Can be divided into a N-terminal globular domain, a proline-rich P-domain forming an elongated arm-like structure and a C-terminal acidic domain. The P-domain binds one molecule of calcium with high affinity, whereas the acidic C-domain binds multiple calcium ions with low affinity. The interaction with glycans occurs through a binding site in the globular lectin domain. The zinc binding sites are localized to the N-domain. Associates with PDIA3 through the tip of the extended arm formed by the P-domain.

Similarity. Belongs to the calreticulin family.

RefSeq proteins (1): NP_004334* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR001580Calret/calnexFamily
IPR009033Calreticulin/calnexin_P_dom_sfHomologous_superfamily
IPR009169CalreticulinFamily
IPR013320ConA-like_dom_sfHomologous_superfamily
IPR018124Calret/calnex_CSConserved_site

Pfam: PF00262

UniProt features (63 total): strand 18, binding site 9, region of interest 8, repeat 7, helix 5, compositionally biased region 4, modified residue 4, turn 3, signal peptide 1, chain 1, short sequence motif 1, glycosylation site 1, disulfide bond 1

Structure

Experimental structures (PDB)

10 structures.

PDBMethodResolution (Å)
3POWX-RAY DIFFRACTION1.55
3POSX-RAY DIFFRACTION1.65
2CLRX-RAY DIFFRACTION2
3DOWX-RAY DIFFRACTION2.3
5LK5X-RAY DIFFRACTION2.3
8TZOELECTRON MICROSCOPY3.1
5V90X-RAY DIFFRACTION3.25
8TZRELECTRON MICROSCOPY3.5
7QPDELECTRON MICROSCOPY3.73
6ENYELECTRON MICROSCOPY5.8

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-P27797-F189.310.69

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 (9): 26; 62; 64; 109; 111; 128; 135; 317; 328

Post-translational modifications (4): 48, 64, 159, 209

Disulfide bonds (1): 105–137

Glycosylation sites (1): 344

Function

Pathways and Gene Ontology

Reactome pathways

27 pathways

IDPathway
R-HSA-1236974ER-Phagosome pathway
R-HSA-168316Assembly of Viral Components at the Budding Site
R-HSA-3000480Scavenging by Class A Receptors
R-HSA-3000484Scavenging by Class F Receptors
R-HSA-381183ATF6 (ATF6-alpha) activates chaperone genes
R-HSA-901042Calnexin/calreticulin cycle
R-HSA-983170Antigen Presentation: Folding, assembly and peptide loading of class I MHC
R-HSA-9918432Maturation of DENV proteins
R-HSA-1236975Antigen processing-Cross presentation
R-HSA-1280218Adaptive Immune System
R-HSA-1643685Disease
R-HSA-168255Influenza Infection
R-HSA-168256Immune System
R-HSA-168268Virus Assembly and Release
R-HSA-2173782Binding and Uptake of Ligands by Scavenger Receptors
R-HSA-2262752Cellular responses to stress
R-HSA-381033ATF6 (ATF6-alpha) activates chaperones
R-HSA-381119Unfolded Protein Response (UPR)
R-HSA-392499Metabolism of proteins
R-HSA-446203Asparagine N-linked glycosylation
R-HSA-532668N-glycan trimming in the ER and Calnexin/Calreticulin cycle
R-HSA-5653656Vesicle-mediated transport
R-HSA-5663205Infectious disease
R-HSA-597592Post-translational protein modification
R-HSA-8953897Cellular responses to stimuli
R-HSA-9824446Viral Infection Pathways
R-HSA-983169Class I MHC mediated antigen processing & presentation

MSigDB gene sets: 659 (showing top): GOBP_NEGATIVE_REGULATION_OF_REPRODUCTIVE_PROCESS, GOBP_RESPONSE_TO_NITROGEN_COMPOUND, HONMA_DOCETAXEL_RESISTANCE, REACTOME_UNFOLDED_PROTEIN_RESPONSE_UPR, WANG_CLIM2_TARGETS_UP, GOBP_CELLULAR_RESPONSE_TO_VIRUS, GOBP_NEGATIVE_REGULATION_OF_NEURON_DIFFERENTIATION, GOBP_MUSCLE_TISSUE_DEVELOPMENT, GOBP_POSITIVE_REGULATION_OF_ENDOCYTOSIS, GOBP_DENDRITIC_CELL_MIGRATION, GOBP_RESPONSE_TO_ELECTRICAL_STIMULUS, GOBP_RESPONSE_TO_ESTRADIOL, GOBP_CELL_CHEMOTAXIS, REACTOME_ADAPTIVE_IMMUNE_SYSTEM, GOBP_INTRACELLULAR_PROTEIN_TRANSPORT

GO Biological Process (42): negative regulation of transcription by RNA polymerase II (GO:0000122), peptide antigen assembly with MHC class I protein complex (GO:0002502), regulation of DNA-templated transcription (GO:0006355), protein folding (GO:0006457), protein export from nucleus (GO:0006611), intracellular calcium ion homeostasis (GO:0006874), spermatogenesis (GO:0007283), positive regulation of cell population proliferation (GO:0008284), response to xenobiotic stimulus (GO:0009410), positive regulation of endothelial cell migration (GO:0010595), positive regulation of gene expression (GO:0010628), negative regulation of translation (GO:0017148), cortical actin cytoskeleton organization (GO:0030866), response to estradiol (GO:0032355), negative regulation of intracellular steroid hormone receptor signaling pathway (GO:0033144), response to testosterone (GO:0033574), protein localization to nucleus (GO:0034504), protein folding in endoplasmic reticulum (GO:0034975), ERAD pathway (GO:0036503), regulation of meiotic nuclear division (GO:0040020), nuclear receptor-mediated glucocorticoid signaling pathway (GO:0042921), regulation of apoptotic process (GO:0042981), negative regulation of neuron differentiation (GO:0045665), positive regulation of cell cycle (GO:0045787), negative regulation of DNA-templated transcription (GO:0045892), negative regulation of retinoic acid receptor signaling pathway (GO:0048387), positive regulation of phagocytosis (GO:0050766), protein stabilization (GO:0050821), obsolete sequestering of calcium ion (GO:0051208), protein maturation (GO:0051604), cardiac muscle cell differentiation (GO:0055007), cellular response to electrical stimulus (GO:0071257), cellular response to lithium ion (GO:0071285), cellular senescence (GO:0090398), cellular response to virus (GO:0098586), positive regulation of substrate adhesion-dependent cell spreading (GO:1900026), negative regulation of trophoblast cell migration (GO:1901164), positive regulation of non-canonical NF-kappaB signal transduction (GO:1901224), response to peptide (GO:1901652), response to glycoside (GO:1903416)

GO Molecular Function (20): complement component C1q complex binding (GO:0001849), DNA binding (GO:0003677), RNA binding (GO:0003723), mRNA binding (GO:0003729), nuclear export signal receptor activity (GO:0005049), integrin binding (GO:0005178), iron ion binding (GO:0005506), calcium ion binding (GO:0005509), zinc ion binding (GO:0008270), carbohydrate binding (GO:0030246), ubiquitin protein ligase binding (GO:0031625), peptide binding (GO:0042277), hormone binding (GO:0042562), protein folding chaperone (GO:0044183), nuclear androgen receptor binding (GO:0050681), obsolete unfolded protein binding (GO:0051082), protein-folding chaperone binding (GO:0051087), molecular sequestering activity (GO:0140313), protein binding (GO:0005515), metal ion binding (GO:0046872)

GO Cellular Component (36): acrosomal vesicle (GO:0001669), extracellular region (GO:0005576), obsolete extracellular space (GO:0005615), nucleus (GO:0005634), nuclear envelope (GO:0005635), cytoplasm (GO:0005737), mitochondrion (GO:0005739), endoplasmic reticulum (GO:0005783), endoplasmic reticulum lumen (GO:0005788), endoplasmic reticulum membrane (GO:0005789), smooth endoplasmic reticulum (GO:0005790), cytosol (GO:0005829), ribosome (GO:0005840), focal adhesion (GO:0005925), external side of plasma membrane (GO:0009897), cell surface (GO:0009986), membrane (GO:0016020), phagocytic vesicle membrane (GO:0030670), extracellular matrix (GO:0031012), sarcoplasmic reticulum lumen (GO:0033018), endoplasmic reticulum-Golgi intermediate compartment membrane (GO:0033116), MHC class I peptide loading complex (GO:0042824), cytolytic granule (GO:0044194), endoplasmic reticulum quality control compartment (GO:0044322), perinuclear region of cytoplasm (GO:0048471), cortical granule (GO:0060473), extracellular exosome (GO:0070062), endocytic vesicle lumen (GO:0071682), lumenal side of endoplasmic reticulum membrane (GO:0098553), postsynapse (GO:0098794), glutamatergic synapse (GO:0098978), lysosome (GO:0005764), endomembrane system (GO:0012505), sarcoplasmic reticulum (GO:0016529), cytoplasmic vesicle (GO:0031410), protein-containing complex (GO:0032991)

Reactome top-level categories

Rollup of top-15 pathways:

CategoryPathways
Binding and Uptake of Ligands by Scavenger Receptors2
Class I MHC mediated antigen processing & presentation2
Antigen processing-Cross presentation1
Virus Assembly and Release1
ATF6 (ATF6-alpha) activates chaperones1
N-glycan trimming in the ER and Calnexin/Calreticulin cycle1
Dengue Virus Genome Translation and Replication1
Immune System1
Viral Infection Pathways1
Influenza Infection1
Vesicle-mediated transport1
Cellular responses to stimuli1
Unfolded Protein Response (UPR)1
Cellular responses to stress1
Post-translational protein modification1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure5
binding4
intracellular membrane-bounded organelle3
cytoplasm3
regulation of gene expression2
nuclear export2
response to chemical2
response to lipid2
protein folding2
protein-containing complex binding2
nucleic acid binding2
transition metal ion binding2
molecular_function2
endomembrane system2
endoplasmic reticulum2
regulation of transcription by RNA polymerase II1
transcription by RNA polymerase II1
negative regulation of DNA-templated transcription1
MHC class I protein complex assembly1
antigen processing and presentation of peptide antigen via MHC class I1
peptide antigen assembly with MHC protein complex1
DNA-templated transcription1
regulation of RNA biosynthetic process1
cellular process1
protein maturation1
intracellular protein transport1
intracellular monoatomic cation homeostasis1
calcium ion homeostasis1
developmental process involved in reproduction1
male gamete generation1
cell population proliferation1
regulation of cell population proliferation1
positive regulation of cellular process1
regulation of endothelial cell migration1
positive regulation of cell migration1
endothelial cell migration1
gene expression1
positive regulation of macromolecule biosynthetic process1
translation1
regulation of translation1

Protein interactions and networks

STRING

5180 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
CALRPDIA3P30101999
CALRLRP1Q07954998
CALRTAPBPO15533998
CALRB2MP01884990
CALRCANXP27824988
CALRTHBS1P07996988
CALRHSP90B1P14625976
CALRMBL2P11226974
CALRPPIBP23284962
CALRNUCLEOLINP19338962
CALRHSP90AA1P07900958
CALRHSP90AB1P08238958
CALRHSPA5P11021956
CALRTLR4O00206952
CALRHSPA4P34932949

IntAct

458 interactions, top by confidence:

ABTypeScore
H2AXPARP1psi-mi:“MI:0914”(association)0.840
TAP1TAPBPpsi-mi:“MI:0914”(association)0.800
TCTN2CLGNpsi-mi:“MI:0914”(association)0.780
APPCALRpsi-mi:“MI:0914”(association)0.740
APPCALRpsi-mi:“MI:0915”(physical association)0.740
CALRPDIA3psi-mi:“MI:0915”(physical association)0.670
MTNR1ACALRpsi-mi:“MI:0915”(physical association)0.660
INAVACYTH3psi-mi:“MI:0914”(association)0.640
B2MTAPBPpsi-mi:“MI:0915”(physical association)0.570
CALRTAF1Bpsi-mi:“MI:0915”(physical association)0.560
GSC2CALRpsi-mi:“MI:0915”(physical association)0.560
CALRSGTBpsi-mi:“MI:0915”(physical association)0.560
CALRpsi-mi:“MI:0915”(physical association)0.560
CALRDNASE1L1psi-mi:“MI:0915”(physical association)0.560
CALRFUT2psi-mi:“MI:0915”(physical association)0.560
CALRGJA5psi-mi:“MI:0915”(physical association)0.560
CALRGNAO1psi-mi:“MI:0915”(physical association)0.560
CALRHLA-DRB3psi-mi:“MI:0915”(physical association)0.560
CALRHSD3B1psi-mi:“MI:0915”(physical association)0.560
CALRIDH1psi-mi:“MI:0915”(physical association)0.560
CALRKLRC1psi-mi:“MI:0915”(physical association)0.560
CALRLGALS1psi-mi:“MI:0915”(physical association)0.560
CALRLGALS8psi-mi:“MI:0915”(physical association)0.560
CALREPCAMpsi-mi:“MI:0915”(physical association)0.560
CALRMAGEA2psi-mi:“MI:0915”(physical association)0.560
CALRCNOT3psi-mi:“MI:0915”(physical association)0.560
CALRPPEF1psi-mi:“MI:0915”(physical association)0.560

BioGRID (547): CALR (Affinity Capture-MS), CALR (Affinity Capture-MS), CALR (Affinity Capture-MS), CALR (Affinity Capture-MS), CALR (Affinity Capture-MS), CALR (Affinity Capture-MS), CALR (Affinity Capture-MS), CALR (Two-hybrid), CALR (Affinity Capture-Western), CALR (Co-fractionation), CALR (Co-fractionation), CALR (Co-fractionation), CALR (Co-fractionation), CALR (Co-fractionation), CALR (Co-fractionation)

ESM2 similar proteins: A0A0D1C6P2, A8XA40, D4AVD4, E2RA18, J9VLH0, O04151, O04153, O14967, O81919, O82709, P11012, P14211, P18418, P24643, P27797, P27798, P27824, P28491, P29402, P29413, P34652, P35564, P35565, P36581, P52193, P52194, P83003, P93508, Q06814, Q23858, Q2HWU3, Q2TBR8, Q38798, Q38858, Q39817, Q39994, Q3SYT6, Q40401, Q4R6K8, Q4VIT5

Diamond homologs: A0A0D1C6P2, A8XA40, D4AVD4, E2RA18, J9VLH0, O04151, O04153, O14967, O81919, O82709, P11012, P14211, P15253, P18418, P24643, P27797, P27798, P27824, P27825, P28491, P29402, P29413, P34652, P35564, P35565, P36581, P52193, P52194, P83003, P93508, Q06814, Q23858, Q2HWU3, Q2TBR8, Q38798, Q38858, Q39817, Q39994, Q3SYT6, Q40401

SIGNOR signaling

0 interactions.

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 160 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

PathwayPartnersFoldFDR
Antigen Presentation: Folding, assembly and peptide loading of class I MHC621.3×2e-04
ER-Phagosome pathway89.3×7e-04

Disease & clinical

Cancer significance

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic1
Likely pathogenic0
Uncertain significance43
Likely benign11
Benign14

Top pathogenic / likely-pathogenic (1)

Variant IDHGVSClassification
1028735NM_004343.4(CALR):c.1154_1155insTTGTC (p.Lys385fs)Pathogenic

SpliceAI

928 predictions. Top by Δscore:

VariantEffectΔscore
19:12938768:G:GTdonor_gain1.0000
19:12939130:TTAG:Tacceptor_loss1.0000
19:12939131:TAGAC:Tacceptor_loss1.0000
19:12939132:A:AGacceptor_gain1.0000
19:12939132:AGAC:Aacceptor_gain1.0000
19:12939132:AGACG:Aacceptor_gain1.0000
19:12939133:G:GGacceptor_gain1.0000
19:12939133:G:GTacceptor_loss1.0000
19:12939133:GAC:Gacceptor_gain1.0000
19:12939133:GACG:Gacceptor_gain1.0000
19:12939133:GACGG:Gacceptor_gain1.0000
19:12939426:AG:Aacceptor_gain1.0000
19:12939427:GG:Gacceptor_gain1.0000
19:12939427:GGT:Gacceptor_gain1.0000
19:12939627:GTTTG:Gdonor_gain1.0000
19:12939630:TGGTG:Tdonor_loss1.0000
19:12939631:GGTG:Gdonor_loss1.0000
19:12939632:G:GAdonor_loss1.0000
19:12939632:G:GGdonor_gain1.0000
19:12939633:T:Adonor_loss1.0000
19:12940046:C:Gacceptor_gain1.0000
19:12940048:C:Gacceptor_gain1.0000
19:12940048:CCTA:Cacceptor_loss1.0000
19:12940049:CTAGG:Cacceptor_loss1.0000
19:12940050:TAG:Tacceptor_loss1.0000
19:12940051:A:ACacceptor_loss1.0000
19:12940051:A:AGacceptor_gain1.0000
19:12940052:G:GGacceptor_gain1.0000
19:12940133:GACA:Gdonor_gain1.0000
19:12940144:CAAGG:Cdonor_loss1.0000

AlphaMissense

2830 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
19:12939454:T:CF74L1.000
19:12939456:T:AF74L1.000
19:12939456:T:GF74L1.000
19:12939547:T:AC105S1.000
19:12939547:T:CC105R1.000
19:12939548:G:AC105Y1.000
19:12939548:G:CC105S1.000
19:12939548:G:TC105F1.000
19:12939549:T:GC105W1.000
19:12939551:G:AG106E1.000
19:12939565:A:GK111E1.000
19:12939567:G:CK111N1.000
19:12939567:G:TK111N1.000
19:12939631:G:CG133R1.000
19:12940053:G:AG133D1.000
19:12940058:G:CD135H1.000
19:12940059:A:TD135V1.000
19:12940064:T:AC137S1.000
19:12940064:T:CC137R1.000
19:12940065:G:AC137Y1.000
19:12940065:G:CC137S1.000
19:12940065:G:TC137F1.000
19:12940066:T:GC137W1.000
19:12940088:C:GH145D1.000
19:12940271:T:CL174P1.000
19:12940595:T:AW253R1.000
19:12940595:T:CW253R1.000
19:12940597:G:CW253C1.000
19:12940597:G:TW253C1.000
19:12940619:T:AW261R1.000

dbSNP variants (sampled 300 via entrez): RS1000233859 (19:12938498 AC>A), RS1000416138 (19:12941902 C>T), RS1000468582 (19:12942199 T>C), RS1000629156 (19:12942229 G>C,T), RS1000646103 (19:12936789 G>A), RS1000842095 (19:12937756 C>T), RS1000890928 (19:12942319 T>G), RS1001540161 (19:12937962 G>C), RS1001584139 (19:12942873 C>T), RS1001915386 (19:12938004 G>A), RS1002033044 (19:12942870 C>T), RS1002085136 (19:12943044 G>A), RS1002142483 (19:12943285 C>G,T), RS1002182121 (19:12941936 A>G), RS1002333831 (19:12937466 G>A)

Disease associations

OMIM: gene MIM:109091 | disease phenotypes: MIM:187950, MIM:254450

GenCC curated gene-disease

Mondo (2): thrombocythemia 1 (MONDO:0008554), primary myelofibrosis (MONDO:0009692)

Orphanet (1): Primary myelofibrosis (Orphanet:824)

HPO phenotypes

84 total (30 of 84 shown, HPO-id order):

HPOTerm
HP:0000006Autosomal dominant inheritance
HP:0000083Renal insufficiency
HP:0000505Visual impairment
HP:0000952Jaundice
HP:0000967Petechiae
HP:0000978Bruising susceptibility
HP:0000979Purpura
HP:0000980Pallor
HP:0001028Hemangioma
HP:0001082Cholecystitis
HP:0001394Cirrhosis
HP:0001409Portal hypertension
HP:0001433Hepatosplenomegaly
HP:0001442Typified by somatic mosaicism
HP:0001541Ascites
HP:0001658Myocardial infarction
HP:0001744Splenomegaly
HP:0001824Weight loss
HP:0001871Abnormality of blood and blood-forming tissues
HP:0001872Abnormality of thrombocytes
HP:0001873Thrombocytopenia
HP:0001876Pancytopenia
HP:0001892Abnormal bleeding
HP:0001894Thrombocytosis
HP:0001903Anemia
HP:0001945Fever
HP:0001974Increased total leukocyte count
HP:0001977Abnormal thrombosis
HP:0001978Extramedullary hematopoiesis
HP:0002024Malabsorption

GWAS associations

4 associations (top):

StudyTraitp-value
GCST001765_24Red blood cell traits8.000000e-20
GCST002595_9Clozapine-induced agranulocytosis1.000000e-06
GCST008058_230Estimated glomerular filtration rate7.000000e-12
GCST90002402_616Platelet count9.000000e-10

EFO canonical traits (2, from GWAS)

EFO IDTrait name
EFO:0004527mean corpuscular hemoglobin
EFO:0004309platelet count

MeSH disease descriptors (1)

DescriptorNameTree numbers
D055728Primary MyelofibrosisC15.378.190.636.765

Drugs & pharmacology

Drug and pharmacology data

Is drug target: yes

ChEMBL targets (1): CHEMBL6066425 (SINGLE PROTEIN)

Clinical evidence (CIViC)

Drug × variant × indication: 1 predictive associations from 1 curated evidence items; also 6 prognostic, 1 diagnostic.

VariantTherapyIndicationEffectLevelCIViC
CALR EXON 9 FRAMESHIFTPeginterferon Alfa-2aEssential ThrombocythemiaSensitivity/ResponseCIViC BEID1482

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

CTD chemical–gene interactions

119 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Tunicamycinincreases expression6
bisphenol Aaffects expression, affects cotreatment, decreases methylation, decreases expression, increases expression5
sodium arsenitedecreases expression, increases abundance, increases expression5
Cadmium Chloridedecreases reaction, increases abundance, increases palmitoylation, increases expression4
Thapsigarginincreases expression4
Resveratrolaffects secretion, decreases reaction, increases expression, decreases expression3
Doxorubicinaffects expression, affects cotreatment, affects localization, increases expression, increases reaction (+1 more)3
Tobacco Smoke Pollutionaffects expression, increases expression3
cobaltous chloridedecreases expression2
methacrylaldehydeaffects cotreatment, increases oxidation, increases abundance2
7,8-diacetoxy-4-methylcoumarinincreases activity, increases acetylation, increases reaction2
Arsenic Trioxidedecreases expression, increases expression, decreases reaction2
Acroleinaffects cotreatment, increases oxidation, increases abundance2
Air Pollutantsincreases abundance, increases oxidation, increases expression, affects cotreatment2
Cadmiumdecreases reaction, increases abundance, increases palmitoylation, increases expression2
Nickelincreases expression2
Ozoneaffects cotreatment, increases oxidation, increases abundance2
Rotenonedecreases expression, increases expression2
Valproic Aciddecreases expression, increases expression, affects reaction2
Aflatoxin B1increases methylation2
Okadaic Acidincreases expression2
Particulate Matterincreases expression, affects expression, increases abundance2
bisphenol Fincreases expression1
beta-N-methylamino-L-alanineincreases expression1
alpha-pineneaffects cotreatment, increases oxidation, increases abundance1
chlorophyllindecreases expression1
potassium perchloratedecreases expression1
sodium arsenatedecreases expression1
titanium dioxideincreases phosphorylation1
pyrogallol 1,3-dimethyl etheraffects cotreatment, affects localization, decreases expression1

ChEMBL screening assays

1 unique, capped per target: 1 binding

Representative assays (with source publication via chembl_document):

Assay IDTypeDescriptionSource paper
CHEMBL5651023BindingBinding affinity to human CALR incubated for 45 mins by Kinobead based pull down assayNVP-BHG712: Effects of Regioisomers on the Affinity and Selectivity toward the EPHrin Family. — ChemMedChem

Cellosaurus cell lines

9 cell lines: 7 cancer cell line, 2 induced pluripotent stem cell

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

CellosaurusNameCategorySex
CVCL_6992MarimoCancer cell lineFemale
CVCL_B8CCAbcam HCT 116 CALR KOCancer cell lineMale
CVCL_B8T8Abcam MCF-7 CALR KOCancer cell lineFemale
CVCL_B9EIAbcam A-549 CALR KOCancer cell lineMale
CVCL_LK61INCABRi001-AInduced pluripotent stem cellFemale
CVCL_SG61HAP1 CALR (-) 1Cancer cell lineMale
CVCL_SG62HAP1 CALR (-) 2Cancer cell lineMale
CVCL_SG63HAP1 CALR (-) 3Cancer cell lineMale
CVCL_VD83INCABRi002-AInduced pluripotent stem cellMale

Clinical trials (associated diseases)

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

TrialPhaseStatusTitle
NCT01558739PHASE4COMPLETEDExploratory Phase II Study of INC424 Patients With Primary Myelofibrosis (PMF) or Post Polycythaemia Myelofibrosis (PPV MF) or Post Essential Thrombocythaemia Myelofibrosis (PET-MF)
NCT02386800PHASE4ACTIVE_NOT_RECRUITINGCINC424A2X01B Rollover Protocol
NCT00799461PHASE3COMPLETEDInternet-Based Program With or Without Telephone-Based Problem-Solving Training in Helping Long-Term Survivors of Hematopoietic Stem Cell Transplant Cope With Late Complications
NCT01178281PHASE3COMPLETEDStudy of Pomalidomide in Persons With Myeloproliferative-Neoplasm-Associated Myelofibrosis and RBC-Transfusion-Dependence
NCT01387763PHASE3COMPLETEDA Study of Low Dose Interferon Alpha Versus Hydroxyurea in Treatment of Chronic Myeloid Neoplasms
NCT01773187PHASE3TERMINATEDPacritinib Versus Best Available Therapy to Treat Myelofibrosis
NCT01969838PHASE3COMPLETEDMomelotinib Versus Ruxolitinib in Subjects With Myelofibrosis
NCT02055781PHASE3TERMINATEDPacritinib Versus Best Available Therapy to Treat Patients With Myelofibrosis and Thrombocytopenia
NCT02087059PHASE3COMPLETEDA Clinical Study of Ruxolitinib in Patients With Primary Myelofibrosis (PM), Post-polycythemia Vera (PV) Myelofibrosis, or Post-essential Thrombocythemia (ET) Myelofibrosis
NCT02101268PHASE3COMPLETEDEfficacy of Momelotinib Versus Best Available Therapy in Anemic or Thrombocytopenic Subjects With Primary Myelofibrosis (MF), Post-polycythemia Vera MF, or Post-essential Thrombocythemia MF
NCT03165734PHASE3ACTIVE_NOT_RECRUITINGA Phase 3 Study of Pacritinib in Patients With Primary Myelofibrosis, Post Polycythemia Vera Myelofibrosis, or Post-Essential Thrombocythemia Myelofibrosis
NCT03755518PHASE3TERMINATEDA Trial of Fedratinib in Subjects With DIPSS, Intermediate or High-Risk Primary Myelofibrosis, Post-Polycythemia Vera Myelofibrosis, or Post-Essential Thrombocythemia Myelofibrosis and Previously Treated With Ruxolitinib
NCT03952039PHASE3COMPLETEDAn Efficacy and Safety Study of Fedratinib Compared to Best Available Therapy in Subjects With DIPSS-intermediate or High-risk Primary Myelofibrosis, Post-polycythemia Vera Myelofibrosis, or Post-essential Thrombocythemia Myelofibrosis and Previously Treated With Ruxolitinib
NCT04173494PHASE3COMPLETEDA Study of Momelotinib Versus Danazol in Symptomatic and Anemic Myelofibrosis Participants (MOMENTUM)
NCT04551053PHASE3TERMINATEDTo Evaluate Efficacy and Safety of Parsaclisib and Ruxolitinib in Participants With Myelofibrosis Who Have Suboptimal Response to Ruxolitinib (LIMBER-304)
NCT04551066PHASE3TERMINATEDTo Evaluate the Efficacy and Safety of Parsaclisib and Ruxolitinib in Participants With Myelofibrosis (LIMBER-313)
NCT04603495PHASE3ACTIVE_NOT_RECRUITINGPhase 3 Study of Pelabresib (CPI-0610) in Myelofibrosis (MF) (MANIFEST-2)
NCT04717414PHASE3ACTIVE_NOT_RECRUITINGAn Efficacy and Safety Study of Luspatercept (ACE-536) Versus Placebo in Subjects With Myeloproliferative Neoplasm-Associated Myelofibrosis on Concomitant JAK2 Inhibitor Therapy and Who Require Red Blood Cell Transfusions
NCT06351631PHASE3RECRUITINGA Study to Evaluate Safety and Efficacy of Bomedemstat (MK-3543-017)
NCT06468033PHASE3RECRUITINGP1101 in Treating Patients With Early PMF or Overt PMF at Low or Intermediate-1 Risk
NCT06479135PHASE3RECRUITINGStudy of Navtemadlin add-on to Ruxolitinib in JAK Inhibitor-Naïve Patients With Myelofibrosis Who Have a Suboptimal Response to Ruxolitinib
NCT07357727PHASE3RECRUITINGA Phase 3 Study of Pelabresib (DAK539) and Ruxolitinib in Myelofibrosis (MF)
NCT00015821PHASE2COMPLETEDThalidomide in Treating Patients With Myelofibrosis
NCT00039416PHASE2COMPLETEDImatinib Mesylate in Treating Patients With Myelofibrosis
NCT00047190PHASE2COMPLETEDTipifarnib in Treating Patients With Myelofibrosis and Myeloid Metaplasia
NCT00086125PHASE2COMPLETEDStudy of AP23573 in Patients With Relapsed or Refractory Hematologic Malignancies (8669-024)(COMPLETED)
NCT00089011PHASE2COMPLETEDTacrolimus and Mycophenolate Mofetil in Preventing Graft-Versus-Host Disease in Patients Who Have Undergone Total-Body Irradiation With or Without Fludarabine Phosphate Followed by Donor Peripheral Blood Stem Cell Transplant for Hematologic Cancer
NCT00095784PHASE2ACTIVE_NOT_RECRUITINGDecitabine in Treating Patients With Myelofibrosis
NCT00136409PHASE2COMPLETEDA Study of Gleevec in Patients With Idiopathic Myelofibrosis or Chronic Myelomonocytic Leukemia (CMML)
NCT00227591PHASE2COMPLETEDLenalidomide and Prednisone in Treating Patients With Myelofibrosis
NCT00255346PHASE2COMPLETEDDasatinib as Therapy for Myeloproliferative Disorders (MPDs)
NCT00287261PHASE2COMPLETEDA Trial of Zoledronic Acid in Patients With Myelofibrosis With Myeloid Metaplasia (MMM)
NCT00381550PHASE2COMPLETED3-AP and Fludarabine in Treating Patients With Myeloproliferative Disorders, Chronic Myelomonocytic Leukemia, or Accelerated Phase or Blastic Phase Chronic Myelogenous Leukemia
NCT00387426PHASE2TERMINATEDSunitinib in Treating Patients With Idiopathic Myelofibrosis
NCT00397813PHASE2COMPLETEDFludarabine Phosphate and Total Body Irradiation Followed by a Donor Peripheral Stem Cell Transplant in Treating Patients With Myelodysplastic Syndromes or Myeloproliferative Disorders
NCT00463385PHASE2COMPLETEDA Phase II Study of Pomalidomide in Myelofibrosis With Myeloid Metaplasia
NCT00489203PHASE2COMPLETEDBeclomethasone Dipropionate in Preventing Acute Graft-Versus-Host Disease in Patients Undergoing a Donor Stem Cell Transplant for Hematologic Cancer
NCT00570999PHASE2WITHDRAWNPalifermin After Haploidentical PBSCT
NCT00795769PHASE2COMPLETEDOndansetron in Preventing Nausea and Vomiting in Patients Undergoing Stem Cell Transplant
NCT00931762PHASE2TERMINATEDA Study to Evaluate Safety and Efficacy of Panobinostat in Participants With Primary Myelofibrosis