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GENATLAS PHENOTYPE
last update : 25-03-2013
Symbol IBM2
Location 9p13.3
Name inclusion body myopathy 2
Other name(s) inclusion body myopathy, quadriceps-sparing
Corresponding gene GNE
Other symbol(s) HIBM, MDRV2, PBD, FTD, QSM
Main clinical features
  • adult-onset, with weakness and atrophy of distal lower limb muscles, and typical histopathological findings in muscle biopsy
  • initial involvement of the distal leg muscles that eventually spreads proximally with sparing of the quadriceps (PMID: 22231866))
  • characterized by slowly progressive onset, distal and proximal muscle weakness
  • typical muscle pathology including rimmed vacuoles and filamentous inclusions,
  • including cases, with linkage disequilibrium in Persian Jews
  • associated or not with Paget disease of bone and frontotemporal dementia
  • Genetic determination autosomal recessive
    Related entries see DMRV, Nonaka distal myopathy (Mim 605820)
    Function/system disorder neuromuscular
    Type disease
    Gene product
    Name UDP N acetylglucosamine-2-epimerase
    Mechanism(s)
    Gene mutationChromosome rearrangementEffectComments
    missense   unknown occuring either in the epimerase or the kinase domain of the enzyme
    Remark(s) hyposialylation plays an important role in the pathomechanism of DMRV/IBM