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In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.

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The E46K mutation modulates α-synuclein prion replication in transgenic mice.

Sara A M Holec1, Jisoo Lee2, Abby Oehler2

  • 1Department of Biology and Institute for Applied Life Sciences, University of Massachusetts Amherst; Amherst, Massachusetts, United States of America.

Plos Pathogens
|December 1, 2022
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The E46K mutation in alpha-synuclein (α-synuclein) protein hinders multiple system atrophy (MSA) prion propagation in mice. This mutation restricts the types of α-synuclein prion strains that can spread, impacting neurodegeneration research.

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Area of Science:

  • Neuroscience
  • Protein Misfolding Diseases
  • Prion Biology

Background:

  • Multiple system atrophy (MSA) involves α-synuclein prion propagation causing neurodegeneration.
  • The E46K mutation in α-synuclein is linked to Parkinson's disease (PD) and previously shown to inhibit MSA prion propagation in vitro.
  • Structural studies suggest a salt bridge involving E46 and K80 stabilizes the MSA α-synuclein conformation.

Purpose of the Study:

  • To investigate if the E46K mutation in α-synuclein influences the propagation of distinct α-synuclein prion strains in vivo.
  • To determine the impact of the E46K mutation on the selective pressure governing α-synuclein prion strain replication.

Main Methods:

  • TgM47+/- mice expressing human α-synuclein with the E46K mutation were inoculated with three different α-synuclein prion strains.
  • TgM20+/- mice expressing wild-type (WT) human α-synuclein were inoculated with E46K preformed fibrils (PFFs).
  • Neurological disease, α-synuclein pathology, and prion propagation kinetics were assessed.

Main Results:

  • TgM47+/- mice were resistant to MSA prion transmission but developed disease and pathology upon inoculation with E46K PFFs.
  • WT PFF inoculation in TgM47+/- mice led to preclinical α-synuclein prion propagation.
  • E46K PFF inoculation in WT α-synuclein expressing mice (TgM20+/-) showed delayed transmission and incomplete attack rates.

Conclusions:

  • The E46K mutation in α-synuclein acts as a selective pressure, limiting the range of α-synuclein prion conformations that can propagate.
  • This finding enhances understanding of the molecular mechanisms controlling α-synuclein prion strain diversity and replication.
  • The study provides insights into how specific mutations can modulate the pathogenesis of α-synucleinopathies like MSA and PD.