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Basic Science and Pathogenesis.

Juliet A Moncaster1,2, Elijah Demb2, Olga Minaeva1,2

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This study found tau protein in mouse lenses, with altered processing in a P301S tau mutant model, but no resulting cataracts. Amyloid-beta may be more significant in Alzheimer

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Genetics

Background:

  • Alzheimer's Disease (AD) is linked to amyloid-beta (Aβ) accumulation in the eye lens.
  • Tau protein, implicated in AD brain pathology, has variable reported expression in mouse lenses.

Purpose of the Study:

  • Investigate tau protein expression in non-transgenic and P301S tau mutant mouse lenses.
  • Determine if tau mutation correlates with a cataract phenotype.

Main Methods:

  • Western blot analysis of tau in lenses from P301S transgenic and non-transgenic mice across their lifespan.
  • Macroscopic imaging of lenses to assess for cataract formation.
  • Utilized tau knockout mouse tissues as controls.

Main Results:

  • Tau protein was detected in lenses of both P301S transgenic and non-transgenic mice.
  • P301S transgenic lenses showed an additional higher molecular weight tau band on Western blot.
  • No cataract phenotype was observed in either group of mice.

Conclusions:

  • The P301S tau mutation appears to affect tau processing in the lens but does not cause cataracts.
  • Amyloid-beta may play a more critical role than tau in lens pathology associated with Alzheimer's Disease.