Pathology of a mouse mutation in peripheral myelin protein P0 is characteristic of a severe and early onset form of human Charcot-Marie-Tooth type 1B disorder

Annette E. Rünker, Igor Kobsar, Torsten Fink, Gabriele Loers, Thomas Tilling, Peggy Putthoff, Carsten Wessig, Rudolf Martini, Melitta Camartin

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Mutations in the gene of the peripheral myelin protein zero (P0) give rise to the peripheral neuropathies Charcot-Marie-Tooth type 1B disease (CMT1 B), Déjérine-Sottas syndrome, and congenital hypomyelinating neuropathy. To investigate the pathomechanisms of a specific point mutation in the P0 gene, we generated two independent transgenic mouse lines expressing the pathogenic CMT1B missense mutation Ile106Leu (P0sub) under the control of the P0 promoter on a wild-type background. Both P0sub-transgenic mouse lines showed shivering and ultrastructural abnormalities including retarded myelination, onion bulb formation, and dysmyelination seen as aberrantly folded myelin sheaths and tomacula in all nerve fibers. Functionally, the mutation leads to dispersed compound muscle action potentials and severely reduced conduction velocities. Our observations support the view that the Ile106Leu mutation acts by a dominant-negative gain of function and that the P0sub-transgenic mouse represents an animal model for a severe, tomaculous form of CMT1B.

Original languageEnglish (US)
Pages (from-to)565-573
Number of pages9
JournalJournal of Cell Biology
Volume165
Issue number4
DOIs
StatePublished - May 24 2004

All Science Journal Classification (ASJC) codes

  • Cell Biology

Keywords

  • Dominant-negative effects
  • Myelin
  • Myelin P0 protein
  • Peripheral neuropathies
  • Tomacula

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