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The β-Secretase Substrate Seizure 6-Like Protein (SEZ6L) Controls Motor Functions in Mice.

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Seizure 6-like (SEZ6L) protein is vital for motor coordination and reducing anxiety. Its absence in knockout mice causes motor deficits and heightened anxiety, suggesting SEZ6L

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • The seizure 6-like (SEZ6L) protein is a neuronal target of BACE1, an Alzheimer's disease-associated protease.
  • The physiological functions of SEZ6L in the nervous system remain largely uncharacterized.

Purpose of the Study:

  • To investigate the physiological role of SEZ6L in the mammalian nervous system.
  • To determine the impact of SEZ6L deficiency on behavior and neuroanatomy.

Main Methods:

  • Utilized constitutive SEZ6L knockout mice for phenotypic analysis.
  • Assessed motor function, anxiety-like behavior, and spatial learning/memory.
  • Performed gross anatomical and proteomic analyses of the cerebellum.

Main Results:

  • SEZ6L knockout mice exhibited motor deficits, including altered gait and reduced motor coordination.
  • Increased anxiety-like behaviors were observed in SEZ6L knockout mice.
  • Spatial learning and memory remained unaffected; cerebellar anatomy and proteome showed no major alterations.

Conclusions:

  • SEZ6L plays a significant role in regulating motor coordination and anxiety-related behaviors.
  • Deficiency in SEZ6L may contribute to movement disorders and neuropsychiatric conditions in humans.
  • The observed phenotypes suggest SEZ6L's function in non-cerebellar regions of the nervous system.