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Zebrafish dscaml1 Deficiency Impairs Retinal Patterning and Oculomotor Function.

Manxiu Ma1,2, Alexandro D Ramirez3, Tong Wang1

  • 1Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, Georgia 30912.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 6, 2019
PubMed
Summary

Down syndrome cell adhesion molecule-like 1 (dscaml1) deficiency impairs zebrafish eye movement circuits, causing deficits in gaze stabilization and saccades. This study establishes a new model for investigating oculomotor disorders.

Keywords:
Dscaml1developmenteye movementretinasaccadezebrafish

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Down syndrome cell adhesion molecules (dscam and dscaml1) are critical for neural circuit assembly.
  • Their precise roles in vertebrate neural circuit function, particularly in oculomotor systems, remain largely uncharacterized.

Purpose of the Study:

  • To investigate the functional consequences of dscaml1 deficiency in the zebrafish oculomotor system.
  • To explore the role of dscaml1 in visuomotor function and identify potential links to human ocular disorders.

Main Methods:

  • Genetic perturbation of dscaml1 in larval zebrafish.
  • Oculomotor behavior analysis, including gaze stabilization, saccades, and fixation.
  • Two-photon calcium imaging of abducens neurons to assess neural activity.

Main Results:

  • Dscaml1 deficiency caused deficits in retinal patterning and light adaptation.
  • Mutant zebrafish exhibited impaired gaze stabilization, reduced saccade amplitude/velocity, and greater ocular disconjugacy.
  • Calcium imaging revealed deficits in saccade-command signals in abducens neurons, indicating premotor pathway impairment.

Conclusions:

  • Loss of dscaml1 leads to specific impairments in oculomotor circuits, affecting visuomotor control.
  • Zebrafish dscaml1 mutants provide a valuable model for studying oculomotor premotor pathways.
  • Findings suggest a role for dscaml1 in neurodevelopmental disorders affecting eye movements, such as ocular motor apraxia.