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Strain-Specific Differences in Cerebellar Anatomy between Laboratory and Wild Rats.

Renata Waner-Mariquito1, Lauren A Williams1, Rachel A Stark1

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Brain, Behavior and Evolution
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Domestication alters brain anatomy, but not uniformly. Cerebellar differences in rats vary by strain, showing domestication effects are not universal across breeds.

Keywords:
AllometryCerebellumDomesticationRodentsStereology

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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Domestication Studies

Background:

  • Domestication significantly alters animal phenotypes, including brain size and structure compared to wild ancestors.
  • While cortical changes are often studied, cerebellar anatomy differences between domestic and wild strains are less understood, particularly regarding cell-level data.

Purpose of the Study:

  • To investigate cerebellar anatomical variations in two domesticated rat strains (Long-Evans, Sprague-Dawley) compared to wild brown rats (Rattus norvegicus).
  • To quantify differences in total cerebellum volume, layer volumes, and Purkinje cell number and size.

Main Methods:

  • Employed unbiased stereology to measure cerebellar volumes and Purkinje cell characteristics.
  • Analyzed total cerebellum volume, specific cerebellar layer volumes (molecular, granule cell, white matter), and Purkinje cell counts and sizes.

Main Results:

  • Long-Evans rats exhibited larger absolute and relative cerebellar volumes than Sprague-Dawley and wild rats.
  • Purkinje cell numbers did not differ significantly across strains, though relative counts varied.
  • Long-Evans rats had smaller Purkinje cells compared to the other strains.

Conclusions:

  • Cerebellar anatomy varies between domesticated rat strains, indicating that domestication effects on the brain are not uniform.
  • Comparative studies of domesticated animals should include multiple strains to avoid oversimplifying the impact of domestication on brain structure.