Different intracellular pathomechanisms produce diverse Myelin Protein Zero neuropathies in transgenic mice

Lawrence Wrabetz, Maurizio D'Antonio, Maria Pennuto, Gabriele Dati, Elisa Tinelli, Pietro Fratta, Stefano Previtali, Daniele Imperiale, Jurgen Zielasek, Klaus Toyka, Robin L. Avila, Daniel A. Kirschner, Albee Messing, M. Laura Feltri, Angelo Quattrini

Research output: Contribution to journalArticle

Abstract

Missense mutations in 22 genes account for one-quarter of Charcot-Marie-Tooth (CMT) hereditary neuropathies. Myelin Protein Zero (MPZ, P0) mutations produce phenotypes ranging from adult demyelinating (CMT1B) to early onset [Déjérine-Sottas syndrome (DSS) or congenital hypomyelination] to predominantly axonal neuropathy, suggesting gain of function mechanisms. To test this directly, we produced mice in which either the MpzS63C (DSS) or MpzS63del (CMT1B) transgene was inserted randomly, so that the endogenous Mpz alleles could compensate for any loss of mutant P0 function. We show that either mutant allele produces demyelinating neuropathy that mimics the corresponding human disease. However, P0S63C creates a packing defect in the myelin sheath, whereas P0S63del does not arrive to the myelin sheath and is instead retained in the endoplasmic reticulum, where it elicits an unfolded protein response (UPR). This is the first evidence for UPR in association with neuropathy and provides a model to determine whether and how mutant proteins can provoke demyelination from outside of myelin.

Original languageEnglish
Pages (from-to)2358-2368
Number of pages11
JournalJournal of Neuroscience
Volume26
Issue number8
DOIs
Publication statusPublished - Feb 22 2006

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Keywords

  • Charcot-Marie-Tooth neuropathy
  • Myelin protein zero
  • Packing
  • Schwann cell
  • Traffic
  • Transgene

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Wrabetz, L., D'Antonio, M., Pennuto, M., Dati, G., Tinelli, E., Fratta, P., Previtali, S., Imperiale, D., Zielasek, J., Toyka, K., Avila, R. L., Kirschner, D. A., Messing, A., Feltri, M. L., & Quattrini, A. (2006). Different intracellular pathomechanisms produce diverse Myelin Protein Zero neuropathies in transgenic mice. Journal of Neuroscience, 26(8), 2358-2368. https://doi.org/10.1523/JNEUROSCI.3819-05.2006