Distinct neuropathologic phenotypes after disrupting the chloride transport proteins ClC-6 or ClC-7/Ostm1

Sarah N.R. Pressey, Kieran J. O'Donnell, Tobias Stauber, Jens C. Fuhrmann, Jaana Tyynelä, Thomas J. Jentsch, Jonathan D. Cooper

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The proteins ClC-6 and ClC-7 are expressed in the endosomal-lysosomal system. Because Clcn6-deficient mice display some features of neuronal ceroid lipofuscinosis (NCL), CLCN6 may be a candidate gene for novel forms of NCL. Using landmarks of disease progression from NCL mouse models as a guide, we examined neuropathologic alterations in the central nervous system of Clcn6 -/-, Clcn7-/-, andgl mice. gl mice bear a mutation in Ostm1, the β-subunit critical for Clcn7 function. Severely affected Clcn7-/- and gl mice have remarkably similar neuropathologic phenotypes, with pronounced reactive changes and neuron loss in the thalamocortical system, similar to findings in early-onset forms of NCL. In contrast, Clcn6-/- mice display slowly progressive, milder neuropathologic features with very little thalamic involvement or microglial activation. These findings detail for the first time the markedly different neuropathologic consequences of mutations in these two CLC genes. Clcn7 -/- and gl mice bear a close resemblance to the progressive neuropathologic phenotypes of early onset forms of NCL, whereas the distinct phenotype of Clcn6-deficient mice suggests that this gene could be a candidate for a later-onset form of mild neurologic dysfunction with some NCL-like features.

Original languageEnglish
Pages (from-to)1228-1246
Number of pages19
JournalJournal of neuropathology and experimental neurology
Volume69
Issue number12
DOIs
StatePublished - Dec 2010

Keywords

  • Chloride channel
  • Chloride/proton exchanger
  • Grey lethal
  • Lysosomal storage disorder
  • Neuronal ceroid lipofuscinosis/ Batten disease

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