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Adding to the list of disease-causing proteins in brain disorders
Date:3/3/2013

e disease could ensue from unregulated fibril formation initiated spontaneously by environmental stress or another factor that regulates a protein's assembly," says Scarborough.

"This paper reflects an amazing collaborative effort and provides a great example of how understanding the underlying pure protein biochemistry can help explain how genetic mutations might cause pathology and disease," says Shorter.

"The findings confirm a strong prediction that the disease-causing mutations make the prion-like segment 'stickier' and more prone to clump," added co-first author Zamia Diaz, also from Penn.

Diseases associated with fibrils forming from prion-like domains in proteins frequently show "spreading" pathology, in which cellular degeneration via inclusions starts in one center of the brain and "spreads" to neighboring tissue. Although not directly addressed in the Nature study, the findings suggest that cell-to-cell transmission of a self-templating protein could contribute to the spreading pathology that is characteristic of these diseases.

"Related proteins with prion-like domains must be considered candidates for initiating and perhaps propagating similar pathologies in muscle, brain, motor neurons, and bone," concluded Shorter.


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Contact: Karen Kreeger
karen.kreeger@uphs.upenn.edu
215-349-5658
University of Pennsylvania School of Medicine
Source:Eurekalert  

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