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GENATLAS PHENOTYPE
last update : 26-02-2016
Symbol MRX99
Location Xp11.4
Name mental retardation, X-linked 99
Corresponding gene USP9X
Main clinical features
  • developmental delay, aggressive behavior, and hypotonia, relative macrocephaly, facial dysmorphism, broad thumbs and great toes, short stature, constipation, and hyperextensibility of joints and skin, speech development most affected
  • Genetic determination sex linked
    Function/system disorder mental retardation
    Type disease
    Remark(s) . USP9X is required for normal neuronal cell migration and variant USP9X forms probably disrupt this process during brain development of the affected individuals (PMID: 24607389))