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Symbol CASQ2 contributors: mct/npt/pgu - updated : 02-12-2014
HGNC name calsequestrin 2 (cardiac muscle)
HGNC id 1513
Corresponding disease
VTSIP2 ventricular tachycardia, catecholaminergic polymorphic 2
Location 1p13.2      Physical location : 116.242.627 - 116.311.426
Synonym name
  • calsequestrin 2, fast-twitch, cardiac muscle
  • calsequestrin, cardiac muscle isoform
  • Synonym symbol(s) CAQC, PDIB2, FLJ26321, FLJ93514, CSQ2
    TYPE functioning gene
    STRUCTURE 68.80 kb     11 Exon(s)
    Genomic sequence alignment details
    10 Kb 5' upstream gene genomic sequence study
    MAPPING cloned Y linked N status provisional
    Physical map
    MRP63P1 1p13.1 mitochondrial ribosomal protein 63 pseudogene 1 LOC391067 1 LOC391067 TRIM33 1p13.1 tripartite motif-containing 33 LOC347675 1p13.1 eukaryotic translation initiation factor 2 beta-like pseudogene LOC339395 1p13.1 similar to Pyruvate kinase, M2 isozyme BCAS2 1p21-p13.3 breast carcinoma amplified sequence 2 FLJ37099 1p13.1 FLJ37099 protein AMPD1 1p13 adenosine monophosphate deaminase 1 (isoform M) NRAS 1p13.2 neuroblastoma RAS viral (v-ras) oncogene homolog D1S155E 1p22 NRAS-related gene FLJ21168 1p13.1 hypothetical protein FLJ21168 SYCP1 1p13 synaptonemal complex protein 1 TSHB 1p13 thyroid stimulating hormone, beta TSPAN-2 1p13.1 tetraspan 2 NGFB 1p13.1 nerve growth factor, beta polypeptide LOC391068 1 similar to mCAF1 protein VANGL1 1p11-p13.1 vang-like 1 (van gogh, Drosophila) LOC387624 1 hypothetical gene supported by NM_024062 CASQ2 1p13.3-p11 calsequestrin 2 (cardiac muscle) NHLH2 1p12-p11 nescient helix loop helix 2 LOC343019 1p12 similar to Hnrpa1 protein SLC22A15 1p12 solute carrier family 22 (organic cation transporter), member 15 FLJ38716 1p12 hypothetical protein FLJ38716 ATP1A1 1p13 ATPase, Na+/K+ transporting, alpha 1 polypeptide MGC16179 1p12 hypothetical protein MGC16179 LOC148766 1p12 hypothetical LOC148766 CD58 1p13 CD58 antigen, (lymphocyte function-associated antigen 3) IGSF3 1p13 immunoglobulin superfamily, member 3 LOC388667 1 LOC388667 LOC391069 1 similar to Glyceraldehyde 3-phosphate dehydrogenase, liver (GAPDH) LOC339396 1p12 similar to neurofilament, heavy polypeptide 200kDa; Neurofilament, heavy polypeptide; neurofilament, heavy polypeptide (200kD) CD2 1p13.1 CD2 antigen (p50), sheep red blood cell receptor PTGFRN 1p13.1-q21.3 prostaglandin F2 receptor negative regulator IGSF2 1p13 immunoglobulin superfamily, member 2 TTF2 1p13.1 transcription termination factor, RNA polymerase II
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    11 - 2716 - 399 - 2009 19376574
    Type restricted
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Cardiovascularheart   highly
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    Muscularsmooth    Homo sapiens
    SystemCellPubmedSpeciesStageRna symbol
    Nervousneuron Homo sapiens
    cell lineage
    cell lines
    at STAGE
    physiological period embryo
    Text umbilical cord
  • C-terminal calcium-sensitive disordered motifs undergoing distinctive Ca(2+)-mediated folding suggesting that these disordered motifs are Ca(2+)-sensitivity
  • conjugated GlycoP
    interspecies homolog to murine Casq2
    intraspecies homolog to CASQ1
  • calsequestrin family
  • CATEGORY storage
    SUBCELLULAR LOCALIZATION     intracellular
    intracellular,cytoplasm,organelle,endoplasmic reticulum
  • sarcoplasmic reticulum
  • CASQ1, CASQ2 are present in the endoplasmic reticulum vacuolar domains of some neurons and smooth muscles
  • accumulates in the perinuclear rough ER
  • basic FUNCTION
  • involved in heart development and function and in storage of calcium for muscle function
  • may be the key sarcoplasmic reticulum (SR) Ca2+ storage protein essential for SR Ca2+ release in mammalian heart
  • intrasarcoplasmic reticulum (SR) low-affinity Ca-binding protein
  • with TRDN are important for the structural organization of the SR
  • facilitates high rates of Ca(2+) release through RYR2 during systole
  • is a low-affinity, high-capacity Ca2+-binding protein that can store Ca2+ within the SR
  • regulatory role of CASQ2 on cytosolic Ca(2+) and KCNH2 channels which may contribute to the etiology of VTSIP2
  • major Ca2+ binding protein in the sarcoplasmic reticulum, which is the principle Ca2+ storage organelle of cardiac muscle
  • plays a critical role in mobilizing Ca2+ release from ER/SR lumens (PMID;
    a component
  • CASQ2, triadin and junctin form a protein complex that is associated with cardiac ryanodine receptor 2 (RYR2) SR Ca(2+) release channels
  • cooperative coordination of Ca2+ between CASQ monomers mediates their oligomerization
    small molecule metal binding,
  • Ca2+
  • protein
  • constant interactions between CASQ2 and ASPH, regardless of the SR Ca(2+) concentration, implying that ASPH is an essential component of the CASQ2 scaffold
  • direct interaction exists between RYR2 and CASQ2
  • cell & other
    Other mitochondrial stress led to concentration-dependent downregulation of CASQ2 and changes in the Ca(2+) signals of the cardiomyocytes that were accompanied by reduction in SR Ca(2+) content and amplitude and duration of Ca(2+) sparks
    corresponding disease(s) VTSIP2
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    constitutional   deletion    
    causes sarcoplasmic reticulum volume increase, premature Ca2+ release, and catecholaminergic polymorphic ventricular tachycardia
    constitutional       gain of function
    in the thyroid of patients with Graves Hyperthyroidism may lead to the production of autoantibodies and sensitized T-lymphocytes, which cross-react with calsequestrin in the extraocular muscle of patients who develop ophthalmopathy
    constitutional     --over  
    enhances hypertrophy of neonatal cardiomyocytes, and the perinuclear enriched form of CASQ2 produces a more pronounced effect compared with CASQ2-WT, consistent with their differential contributions to nuclear Ca2+ levels
    Susceptibility to familial hypertrophic cardiomyopathy
    Variant & Polymorphism other variant identified in the CASQ2 gene (Asp63Glu)in familial hypertrophic cardiomyopathy
    Candidate gene
    Therapy target