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Symbol MUSK contributors: mct/pgu - updated : 08-07-2015
HGNC name muscle, skeletal, receptor tyrosine kinase
HGNC id 7525
Corresponding disease
CMS1D congenital myasthenic syndrome, 1D
FADSL fetal akinesia deformation sequence lethal
Location 9q31.3      Physical location : 113.431.050 - 113.563.278
Synonym name
  • protein-tyrosine kinase
  • muscle-specific kinase receptor
  • Synonym symbol(s) MGC126323, MGC126324, CMS9
    TYPE functioning gene
    STRUCTURE 132.23 kb     15 Exon(s)
    10 Kb 5' upstream gene genomic sequence study
    MAPPING cloned Y linked N status provisional
    Physical map
    LOC347292 9q32 similar to ribosomal protein L36; 60S ribosomal protein L36 IKBKAP 9q31 inhibitor of kappa light polypeptide gene enhancer in B-cells, kinase complex-associated protein ACTL7B 9q31 actin-like 7B ACTL7A 9q31 actin-like 7A FLJ20457 9q32 hypothetical protein FLJ20457 CTNNAL1 9q31.2 catenin (cadherin-associated protein), alpha-like 1 C9orf5 9q31 chromosome 9 open reading frame 5 EPB41L4B 9q22.1-q22.3 erythrocyte membrane protein band 4.1 like 4B FLJ21596 9q32 hypothetical protein FLJ21596 PTPN3 9q31.2 protein tyrosine phosphatase, non-receptor type 3 LOC347295 9q32 similar to DNA-binding protein B LOC389783 9 LOC389783 AKAP2 9q31-q33 a kinase (PRKA) anchor protein 2 PALM2 9q31-q33 paralemmin 2 TXN 9q31 thioredoxin LOC255220 9q32 similar to RIKEN cDNA 4930429J24 MUSK 9q31.3-q32 muscle, skeletal, receptor tyrosine kinase EDG2 9q31.3-q32 endothelial differentiation, lysophosphatidic acid G-protein-coupled receptor, 2 OR2K2 9q32 olfactory receptor, family 2, subfamily K, member 2 OR2AR1P 3p24.1 olfactory receptor, family 2, subfamily AR, member 1 pseudogene KIAA0368 9q22.3-q32 olfactory receptor, family 2, subfamily AR, member 1 pseudogene ZNF483 9 zinc finger protein 483 LTB4DH 9q32 leukotriene B4 12-hydroxydehydrogenase LOC392383 9 similar to hypothetical protein FLJ10120 GNG10 9q31-q32 guanine nucleotide binding protein (G protein), gamma 10 FLJ32779 UGCG 9q31 UDP-glucose ceramide glucosyltransferase DKFZP761E1824 ROD1 9q32 ROD1 regulator of differentiation 1 (S. pombe) EPF5 9q33.1 EPF5 pseudogene LOC392384 9 similar to 60S ribosomal protein L32 MGC10940 9q33.1 hypothetical protein MGC10940 LOC389784 9 LOC389784 KIAA1958 9q33.1 KIAA1958 HSPC043 LOC389785 9 similar to RIKEN cDNA 4732481H14 LOC169831 9q33.1 similar to RIKEN cDNA 4732481H14 TSCOT 6p21-p11.2 thymic stromal co-transporter LOC169834 9q33.1 hypothetical protein LOC169834 ZFP37 9q32 zinc finger protein 37 homolog (mouse)
    TRANSCRIPTS type messenger
    identificationnb exonstypebpproduct
    ProteinkDaAAspecific expressionYearPubmed
    15 - 2764 96.9 869 - 2008 18165682
    13 - 2496 - 783 - 2008 18165682
    12 - 2466 86.3 773 - 2008 18165682
    Type restricted
       expressed in (based on citations)
    SystemOrgan level 1Organ level 2Organ level 3Organ level 4LevelPubmedSpeciesStageRna symbol
    Nervousbrainlimbic systemhippocampus   Homo sapiens
     brainforebraincerebral cortex   Homo sapiens
     brainhindbraincerebellum   Homo sapiens
    Olfactory (smell)olfactory bulb     Homo sapiens
    SystemTissueTissue level 1Tissue level 2LevelPubmedSpeciesStageRna symbol
    cell lineage
    cell lines
    at STAGE
    physiological period embryo, fetal
    Text early myotomes and developing muscle
  • the most N-terminal Ig-like domain is essential for AGRN to stimulate MUSK phosphorylation
  • a large ectodomain which comprises three immunoglobulin-like domains and a cysteine-rich domain (Fz-CRD) related to those in Frizzled proteins, the receptors for Wnts
  • a spacer between domains 3 and 4, containing 6 conserved cysteines
  • a kringle domain
  • a soluble extracellular domain that potentiates Agrin-binding to LRP4-expressing cells
  • protein kinase superfamily
  • Tyr protein kinase family
  • CATEGORY enzyme , receptor membrane
    SUBCELLULAR LOCALIZATION     plasma membrane,junction
    basic FUNCTION
  • playing an essential role in stabilizing the muscle prepattern, and has a potent role in regulating the formation of synapses
  • initial step in postsynaptic differentiation and formation of an end-plate band in cooperation with rapsyn
  • essential receptor tyrosine kinase for the establishment and maintenance of the neuromuscular junction (NMJ)
  • essential to initiate AChR clustering but also to restrict approaching growth cones to the muscle center, thereby coordinating pre- and postsynaptic development
  • recruits docking protein-7 (DOK7), an adaptor protein that is expressed selectively in muscle (
  • transmembrane tyrosine kinase vital for forming and maintaining the mammalian neuromuscular junction
  • its activation initiates complex intracellular signalling events that coordinate the local synthesis and assembly of synaptic proteins
  • LRP4 and MUSK act as scaffolds for multiple binding partners, resulting in a complex and dynamic network of interacting proteins that is required for ACHR clustering
  • receptor tyrosine kinase that plays a central signaling role in the formation of neuromuscular junctions (NMJs)
  • uses both classical and nonclassical endosomal pathways that involve a variety of different components of the endosomal machinery
  • role of MUSK as a tyrosine kinase that orchestrates neuromuscular synaptogenesis
    text muscle development
    a component
    small molecule
  • rapsyn
  • LRP4 and MUSK can interact and form a complex
  • associate with SHC4 via its PTB domain (undergo tyrosine phosphorylation downstream of activated MUSK)
  • PDZRN3 binds to MUSK and promotes its ubiquitination
  • MUSK-interacting protein DOK7 is essential for neuromuscular synaptogenesis, although the mechanisms by which DOK7 regulates MUSK activity and promotes synapse formation have been unclear
  • AGRN binds LRP4 and stimulates further MUSK phosphorylation, stabilizing nascent synapses
  • LRP4 is a cis-acting ligand for MUSK, whereas AGRN functions as an allosteric and paracrine regulator to promote association between LRP4 and MUSK
  • is a WNT4 receptor (WNT4 not only interacts with MUSK ectodomain but also mediates MUSK activation)
  • LRP4 acts bi-directionally and coordinates synapse formation by binding AGRN, activating MUSK and stimulating postsynaptic differentiation
  • ligand for MUSK is LRP4, a transmembrane protein in muscle, whose binding affinity for MUSK is potentiated by agrin, a neuronally derived heparan-sulfate proteoglycan 9)
  • DOK7, a cytoplasmic adaptor protein, is also required for MUSK activation 9)
  • MUSK activation by DOK7 mildly affects the localization of MUSK on the cell surface but has no effect on the rate of MUSK internalization
  • MUSK activator agrin plays another role essential for the postnatal maintenance, but not for embryonic formation, of NMJs and also for the postnatal, but not prenatal, midmuscle localization of postsynaptic specializations
  • DOK7 is essential for activation of the receptor kinase MUSK, which governs NMJ formation
  • cell & other
    activated by AGRN to cluster acetylcholine receptors
    activation of muscle-specific receptor tyrosine kinase and binding to dystroglycan are regulated by alternative mRNA splicing of agrin AGRN)
    LRP4 (low-density lipoprotein receptor-related protein-4)
    corresponding disease(s) CMS1D , FADSL
    Variant & Polymorphism
    Candidate gene
    Therapy target