Selected-GenAtlas references SOURCE GeneCards NCBI Gene Swiss-Prot Ensembl
HGNC UniGene Nucleotide OMIM UCSC
Home Page
Symbol CASQ1 contributors: mct - updated : 09-05-2016
HGNC name calsequestrin 1 (fast-twitch, skeletal muscle)
HGNC id 1512
Corresponding disease
VMCQA vacuolar myopathy with CASQ1 aggregates
Location 1q23.2      Physical location : 160.160.284 - 160.171.674
Synonym name
  • calmitine
  • calmitin
  • calsequestrin 1
  • Synonym symbol(s) CALS, CASQ, PDIB1, VMCQA
    TYPE functioning gene
    STRUCTURE 11.39 kb     11 Exon(s)
    Genomic sequence alignment details
    10 Kb 5' upstream gene genomic sequence study
    MAPPING cloned Y linked N status confirmed
    Physical map
    LOC391121 1 similar to olfactory receptor MOR267-3 OR10J1 1q22 olfactory receptor, family 10, subfamily J, member 1 LOC127385 1q23.1 similar to Olfactory receptor 10J5 LOC391122 1 similar to porcine serum amyloid P component (SAP) APCS 1q23.2 amyloid P component, serum LOC339511 1q23.1 similar to Olfactory receptor 10J6 LOC171422 1q23.1 C-reactive protein pseudogene CRP 1q23.2 C-reactive protein, pentraxin-related FLJ20442 1q23.1 hypothetical protein FLJ20442 LOC343413 1q23.1 similar to Fc receptor homolog expressed in B cells; Fc receptor related protein X SLAMF8 1q23.1 SLAM family member 8 LOC391123 1 similar to hypothetical protein A030011M19 NESG1 1q22 similar to hypothetical protein A030011M19 TAGLN2 1q22 transgelin 2 IGSF9 1q22-q23 immunoglobulin superfamily, member 9 SLAMF9 1q23.1 SLAM family member 9 LOC391124 1 similar to ribosomal protein L27a; ribosomal protein L29 homolog (yeast) PIGM 1q22 phosphatidylinositol glycan, class M KCNJ10 1q22 potassium inwardly-rectifying channel, subfamily J, member 10 KCNJ9 1q22 potassium inwardly-rectifying channel, subfamily J, member 9 IGSF8 1q23.1 immunoglobulin superfamily, member 8 ATP1A2 1q22 ATPase, Na+/K+ transporting, alpha 2 (+) polypeptide ATP1A4 1q22 ATPase, Na+/K+ transporting, alpha 4 polypeptide CASQ1 1q22 calsequestrin 1 (fast-twitch, skeletal muscle) PEA15 1q22 phosphoprotein enriched in astrocytes 15 H326 1q22-q23 H326 LOC388707 1 hypothetical gene supported by BC005391; NM_002295 COPA 1q22 coatomer protein complex, subunit alpha PXF 1q22 peroxisomal farnesylated protein NCSTN 1q22 peroxisomal farnesylated protein NHLH1 1q22 nescient helix loop helix 1 VANGL2 1q22 vang-like 2 (van gogh, Drosophila) SLAMF6 1q23.1 SLAM family member 6 CD84 1q22-q23 CD84 antigen (leukocyte antigen) SLAMF1 1q21.3-1q23.2 signaling lymphocytic activation molecule family member 1 CD48 1q23 CD48 antigen (B-cell membrane protein) SLAMF7 1q23.1-q24.1 SLAM family member 7 LY9 1q21.3-q22 lymphocyte antigen 9
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    11 - 1993 41.74 390 - 2013 23792176
    Type restricted
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Respiratoryrespiratory tractlarynx   
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    Muscularsmooth    Homo sapiens
    SystemCellPubmedSpeciesStageRna symbol
    Nervousneuron Homo sapiens
    cell lineage
    cell lines
    at STAGE
  • 21 phosphorylation sites
  • 4 myristylation sites
  • one N glycosylation site
  • C-terminal calcium-sensitive disordered motifs undergoing distinctive Ca(2+)-mediated folding suggesting that these disordered motifs are Ca(2+)-sensitivity
    intraspecies homolog to CASQ2
  • calsequestrin family
  • CATEGORY motor/contractile , storage
    SUBCELLULAR LOCALIZATION     intracellular
    intracellular,cytoplasm,organelle,endoplasmic reticulum
  • luminal space of the terminal cisternae of RE
  • sarcoplasmic reticulum
  • CASQ1, CASQ2 are present in the endoplasmic reticulum vacuolar domains of some neurons and smooth muscles
  • basic FUNCTION
  • calcium storage protein in terminal cisternae of sarcoplasmic reticulum
  • represents the Ca2+ reservoir of mitochondria, the function of which could be similar to what has been reported for calsequestrine in the sarcoplasmic reticulum (Bataille 1994)
  • is thought to play a dual role in excitation-contraction coupling: buffering free Ca(2+) increasing SR capacity, and modulating the activity of the Ca(2+) release channels (RyRs) (Paolini 2007)
  • high-capacity, moderate affinity, calcium-binding protein and thus acts as an internal calcium store in muscle
  • involved in intracellular storage and release of calcium, a process that has been shown to mediate glucose transport in muscle
  • essential for the normal development of the sarcoplasmic reticulum (SR)and its calcium release units and for the storage and release of appropriate amounts of SR Ca(2+) (Paolini 2007)
  • curtails RYR1 opening in response to a single action potential to maintain Ca(2+) and allow repeated Ca(2+) release and graded activation with increased stimulation frequency (Wei 2009)
  • functions as both a Ca(2+)-binding protein and a luminal regulator of ryanodine receptor (RYR1)-mediated Ca(2+) release (Dainese (2009)
  • principal Ca(2+) storage protein of the sarcoplasmic reticulum of skeletal muscle
    a component
    small molecule metal binding,
  • calcium Ca2+
  • low affinity
  • high capacity
  • protein
  • binds laminin
  • ASPH and TRDN each activate skeletal ryanodine receptors but ASPH alone mediates functional interactions with CASQ1
  • TRDN and ASPH are structurally related transmembrane proteins thought to be key mediators of structural and functional interactions between calsequestrin (CASQ1) and ryanodine receptor (RyRs) at the junctional sarcoplasmic reticulum
  • DYSF interacts with CASQ1, MYOM2 and dynein in human skeletal muscle
  • role for CASQ1 in promoting the stable association of TRDN to the multiprotein complex associated with RYR
  • cell & other
    corresponding disease(s) VMCQA
    related resource MITOP database
  • to type 2 diabetes
  • to Graves ophthalmopathy (GO)
  • to malignant hyperthermia
  • Variant & Polymorphism SNP
  • increasing the risk of of type 2 diabetes
  • SNPs rs74123279, rs3838216, and rs2275703 may be considered as genetic markers for GO
  • M87T "variant" is weakly associated with malignant hyperthermia
  • Candidate gene potential candidate gene for linkage analysis in families with malignant hyperthermia/environmental heat stroke where mutations in the RYR1 gene are excluded (Dainese 2009)
    Therapy target
  • CASQ1-null mice exhibit increased spontaneous mortality and susceptibility to heat- and anesthetic-induced sudden death (Dainese 2009)