Prion protein with an octapeptide insertion has impaired neuroprotective activity in transgenic mice

Aimin Li, Pedro Piccardo, Sami J Barmada, Bernardino Ghetti, David A Harris

Research output: Contribution to journalArticlepeer-review


Familial prion diseases are due to dominantly inherited, germline mutations in the PRNP gene that encodes the prion protein (PrP). The cellular mechanism underlying the pathogenic effect of these mutations remains uncertain. To investigate whether pathogenic mutations impair a normal, physiological activity of PrP, we have crossed Tg(PG14) mice, which express PrP with an octapeptide insertion associated with an inherited prion dementia, with Tg(PrPDelta32-134) mice. Tg(PrPDelta32-134) mice, which express an N-terminally truncated form of PrP, spontaneously develop a neurodegenerative phenotype that is stoichiometrically reversed by coexpression of wild-type PrP. We find that, at equivalent expression levels, PG14 PrP is significantly less efficient than wild-type PrP in suppressing the development of clinical symptoms and neuropathology in Tg(PrPDelta32-134) mice. Thus, our results suggest that some features of the neurological illness associated with inherited PrP mutations may be attributable to a loss of PrP neuroprotective function. This mechanism stands in contrast to the toxic gain-of-function mechanisms that are usually invoked to explain the pathogenesis of dominantly inherited neurodegenerative disorders.

Original languageEnglish
Pages (from-to)2777-85
Number of pages9
JournalEMBO Journal
Issue number11
Publication statusPublished - 6 Jun 2007


  • Animals
  • Blotting, Western
  • Brain
  • Crosses, Genetic
  • Mice
  • Mice, Transgenic
  • Mutagenesis, Insertional
  • Phenotype
  • Prion Diseases
  • Prions


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