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New twists in the evolution of retinal direction selectivity
Takeshi Yoshimatsu1, Tom Baden2
1Department of the Ophthalmology and Visual Sciences, Washington University in St. Louis School of Medicine, St. Louis, Missouri, United States of America.
Plos Biology
|February 29, 2024
Summary
Starburst amacrine cells, crucial for motion vision in mammals, have been discovered in zebrafish. These neurons, alongside similar starburst-like cells, were identified but showed no strong motion selectivity.
Area of Science:
- Neuroscience
- Vision Science
- Comparative Biology
Background:
- Starburst amacrine cells (SACs) are key retinal interneurons in mammals, essential for processing motion information.
- Their presence and function in non-mammalian vertebrates, like fish, remain largely unexplored.
Purpose of the Study:
- To investigate the existence and characteristics of starburst amacrine cells in zebrafish.
- To determine if these cells in zebrafish exhibit motion selectivity, similar to their mammalian counterparts.
Main Methods:
- Immunohistochemistry using specific markers for starburst amacrine cells.
- Retinal whole-mount preparations and confocal microscopy.
- Analysis of neuronal morphology and distribution.
Main Results:
- The study identified starburst amacrine cells in the zebrafish retina.
- A second, distinct population of starburst-like neurons was also found.
- Neither the identified SACs nor the starburst-like neurons demonstrated strong selectivity for motion direction.
Conclusions:
- Starburst amacrine cells are conserved in zebrafish, suggesting a fundamental role in vertebrate vision.
- The lack of strong motion selectivity in zebrafish SACs indicates divergent evolution of motion processing circuits compared to mammals.
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