Mutation of FIG4 causes a rapidly progressive, asymmetric neuronal degeneration

Xuebao Zhang, Clement Y. Chow, Zarife Sahenk, Michael E. Shy, Miriam H. Meisler, Jun Li

Research output: Contribution to journalArticlepeer-review

106 Scopus citations


Recessive Charcot-Marie-Tooth disease type-4J (CMT4J) and its animal model, the pale tremor mouse (plt), are caused by mutations of the FIG4 gene encoding a PI(3,5)P2 5-phosphatase. We describe the 9-year clinical course of CMT4J, including asymmetric, rapidly progressive paralysis, in two siblings. Sensory symptoms were absent despite reduced numbers of sensory axons. Thus, the phenotypic presentation of CMT4J clinically resembles motor neuron disease. Time-lapse imaging of fibroblasts from CMT4J patients demonstrates impaired trafficking of intracellular organelles because of obstruction by vacuoles. Further characterization of plt mice identified axonal degeneration in motor and sensory neurons, limited segmental demyelination, lack of TUNEL staining and lack of accumulation of ubiquitinated protein in vacuoles of motor and sensory neurons. This study represents the first documentation of the natural history of CMT4J. Physical obstruction of organelle trafficking by vacuoles is a potential novel cellular mechanism of neurodegeneration.

Original languageEnglish (US)
Pages (from-to)1990-2001
Number of pages12
Issue number8
StatePublished - Aug 2008


  • Amyotrophic lateral sclerosis
  • Axonal degeneration
  • FIG4 or SAC3 gene
  • Motor neuron disease
  • Neuronopathy
  • PI(3,5)P2-5-phosphatase
  • Schwann cells
  • Segmental demyelination
  • Vacuoles

ASJC Scopus subject areas

  • Clinical Neurology


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