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Progressive Supranuclear Palsy PERK Haplotype B Selectively Translates DLX1 Promoting Tau Toxicity.

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The PERK-B genetic variant increases progressive supranuclear palsy (PSP) risk by allowing translation of the DLX1 gene, which drives tau pathology. Reducing DLX1 lessens tau toxicity, offering new therapeutic targets for PSP.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Progressive supranuclear palsy (PSP) is a tauopathy with no effective treatments.
  • The PERK gene has two haplotypes, A and B, with PERK-B linked to increased PSP risk.
  • Mechanisms linking PERK-B to tauopathy remain unclear.

Purpose of the Study:

  • To compare the functional differences between PERK-A and PERK-B.
  • To identify mechanisms by which PERK-B contributes to tauopathy.
  • To explore the PERK-B/DLX1 pathway in PSP pathogenesis.

Main Methods:

  • Developed controlled cellular models for PERK-A and PERK-B comparison.
  • Utilized puromycin-based proteomics to analyze mRNA translation.
  • Examined DLX1 solubility in human PSP brain tissue.
  • Silenced the fly homolog of DLX1 to assess tau toxicity.

Main Results:

  • PERK-A and PERK-B showed nearly indistinguishable unfolded protein response (UPR) functions.
  • PERK-B permitted translation of specific mRNAs, including DLX1, under UPR.
  • DLX1 accumulated in detergent-insoluble fractions in PSP brains.
  • Silencing fly DLX1 reduced tau-induced toxicity in vivo.

Conclusions:

  • Identified a novel PERK-B/DLX1 pathway driving tau pathology.
  • DLX1 is a key mediator of PERK-B's contribution to PSP.
  • This pathway represents a potential therapeutic target for PSP and related tauopathies.