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Genetic background influences UPR but not PLP processing in the rumpshaker model of PMD/SPG2

M McLaughlin1, S A Karim, P Montague

  • 1Applied Neurobiology Group, Division of Cell Sciences, Institute of Comparative Medicine, University of Glasgow, Bearsden, Glasgow, G61 1QH, Scotland.

Neurochemical Research
|September 1, 2006
PubMed

Insights

Genetic background significantly impacts the severity of Pelizaeus-Merzbacher disease (PMD) in mice with the rumpshaker mutation. Protein processing differences do not explain this phenotypic variation, suggesting other factors influence disease progression.

Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Mutations in the proteolipid protein gene (PLP1) are linked to Pelizaeus-Merzbacher disease (PMD) and Spastic paraplegia type 2 (SPG2).
  • The rumpshaker mutation in PLP1 causes milder forms of these neurological disorders in humans and mice.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the variable phenotypic severity of the rumpshaker mutation in different mouse genetic backgrounds.
  • To determine if differences in proteolipid protein (PLP) processing or unfolded protein response (UPR) pathways contribute to the observed phenotypic variation.

Main Methods:

  • Comparative analysis of PLP/DM20 synthesis, degradation, and myelin incorporation rates in C3H and C57BL/6 mice carrying the rumpshaker mutation.
  • Assessment of unfolded protein response (UPR) activation, including the expression of CHOP, BiP, and Xbp1, in relation to phenotypic severity.

Main Results:

  • The rumpshaker mutation leads to a lethal phenotype in C57BL/6 mice, contrasting with a milder form in C3H mice, despite similar PLP/DM20 synthesis, degradation, and myelin incorporation rates across both backgrounds.
  • An unfolded protein response (UPR) is activated in rumpshaker mutants, with CHOP activation correlating with disease severity.
  • No significant differences were observed in the activation of BiP and X-box protein1 (Xbp1) between the two mouse strains, suggesting these specific UPR components are not primary drivers of the phenotypic variation.

Conclusions:

  • Phenotypic variation in rumpshaker-associated neurological disorders is not solely due to differences in PLP/DM20 protein processing.
  • The severity of the disease phenotype is linked to the activation of specific components of the unfolded protein response (UPR), such as CHOP.
  • The genetic background plays a critical role in modulating the impact of PLP1 mutations on disease outcome.

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