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Molecular Human Reproduction, Vol 3, 529-544, Copyright © 1997 by Oxford University Press

REVIEW, ACADEMIC

Transgenic analysis of prion diseases

RC Moore and DW Melton
Institute of Cell and Molecular Biology, University of Edinburgh, UK.

Prion diseases are fatal transmissible neurological disorders afflicting a range of mammalian species. Although still controversial, a large body of data suggests that the causative agent may be composed entirely of a small glycoprotein. The brains of infected animals have accumulations of a pathogenic protease-resistant isoform (PrPsc) of a normal host-encoded glycoprotein, PrPc or prion protein. A number of lines of biochemical evidence implicate the disease-specific isoform, PrPsc, as the transmissible agent and genetic analysis has shown tight linkage between PrP gene mutations and polymorphisms and differential susceptibility to prion diseases, Perhaps the strongest evidence for a protein-only model of the agent is that PrP gene-ablated mice are resistant to scrapie and that mice with PrP mutation, corresponding to those found in a human familial prion disease, spontaneously develop a transmissible prion disease. This review describes the critical role that transgenic technology has played in the study of the biology of prion diseases and considers the issues raised by this work.
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