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Updated: Jul 15, 2026
Retrograde Labeling of Retinal Ganglion Cells in Adult Zebrafish with Fluorescent Dyes
Published on: May 3, 2014
The disarrayed mutation results in cell cycle and neurogenesis defects during retinal development in zebrafish
1Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226, USA. lbaye@mcw.edu <lbaye@mcw.edu>
Background:
The vertebrate retina is derived from proliferative neuroepithelial cells of the optic cup. During retinal development, cell proliferation and the processes of cell cycle exit and neurogenesis are coordinated in neuroepithelial progenitor cells. Previous studies have demonstrated reciprocal influences between the cell cycle and neurogenesis. However the specific mechanisms and exact relationships of cell cycle regulation and neurogenesis in the vertebrate retina remain largely unknown.
Results:
We have isolated and characterized a zebrafish mutant, disarrayed (drya64), which exhibits retinal defects in cell cycle regulation and neurogenesis. By 42 hours post fertilization, disarrayed mutants show small eyes and a reduced forebrain. Other aspects of development appear normal. Although retinogenesis is delayed, mutant retinal cells eventually differentiate to all major cell types. Examination of the disarrayed mitotic cycle using BrdU and direct imaging techniques revealed that retinal neuroepithelial cells have an extended cell cycle period and reduced rate of cell cycle exit and neurogenesis, despite the fact that neurogenesis initiates at the appropriate time of development. Genetic mosaic analyses indicate that the cell cycle phenotype of disarrayed is cell-non-autonomous.
Conclusion:
The disarrayed mutant shows defects in both cell cycle regulation and neurogenesis and provides insights into the coordinated regulation of these processes during retinal development.
Insights
A zebrafish mutant, disarrayed, reveals defects in retinal cell cycle regulation and neurogenesis. This finding offers insights into how these crucial processes are coordinated during vertebrate eye development.
Area of Science:
- Developmental Biology
- Neuroscience
- Genetics
Background:
- Vertebrate retina develops from optic cup neuroepithelial cells.
- Retinal development involves coordinated cell proliferation, cell cycle exit, and neurogenesis.
- Mechanisms linking cell cycle regulation and neurogenesis in the retina are not fully understood.
Purpose of the Study:
- To investigate the relationship between cell cycle regulation and neurogenesis in retinal development.
- To characterize a zebrafish mutant with retinal defects in these processes.
Main Methods:
- Isolation and characterization of the zebrafish mutant 'disarrayed' (drya64).
- Analysis of cell cycle progression using Bromodeoxyuridine (BrdU) labeling and direct imaging.
- Genetic mosaic analyses to determine the cell-autonomous or non-autonomous nature of the phenotype.
Main Results:
- Disarrayed mutants exhibit small eyes and reduced forebrain by 42 hours post-fertilization.
- Mutant retinal cells show an extended cell cycle and reduced rate of cell cycle exit and neurogenesis.
- Retinogenesis is delayed, but all major retinal cell types eventually differentiate; the cell cycle phenotype is cell-non-autonomous.
Conclusions:
- The disarrayed mutant displays significant defects in both cell cycle regulation and neurogenesis.
- This mutant provides a valuable model for understanding the coordinated control of cell cycle and neurogenesis in retinal development.
