Abstract
Zebrafish are widely used to investigate visual function, owing to their well-defined retinal organization and optical transparency during early developmental stages. Here, we evaluate the effectiveness of a color vision optomotor response (CV-OMR) assay for assessing zebrafish with red cone ablation. Tg (thrb:gal4;UAS:epNTR-p2a-mCherry) transgenic zebrafish were used to ablate red cones via the addition of metronidazole (MTZ). Transgenic zebrafish larvae were treated with MTZ for 0, 12 and 24 h at 5 days post-fertilization, resulting in Tg(+)MTZ(−), Tg(+)MTZ(+)12 h and Tg(+)MTZ(+)24 h groups, respectively. The areas of mCherry-expressing cells, representing red cones in tissue sections, were compared. The mean mCherry expression area was smallest in the Tg(+)MTZ(+)24 h group (16.5 ± 7.6 μm2), followed by the Tg(+)MTZ(+)12 h (404.1 ± 200.9 μm2) and Tg(+)MTZ(−) groups (1,066.6 ± 252.2 μm2; P < 0.001). At 6 days post-fertilization, zebrafish larvae were evaluated using the CV-OMR assay comprising two colors. Results were reported as the area under the curve of the ratio of larvae at the starting point curve. The ratio of larvae at the starting point decreased most rapidly in the Tg(+)MTZ(−) group and most slowly in the Tg(+)MTZ(+)24 h group. There were significant differences in the area under the curve of the ratio of larvae at the starting point curve among the three groups. In conclusion, the CV-OMR assay demonstrated the ability to differentiate color vision impairment based on the extent of red cone ablation. The CV-OMR assay used in this study may prove valuable for evaluating color vision in zebrafish with various eye diseases.
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The data that support the findings of this study are available from the corresponding author upon request. Source data are provided with this paper.
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Acknowledgements
We express our gratitude to R. O. Wong (University of Washington) and T. Yoshimatsu for providing the pCG2thrb:gal4 DNA plasmid, as well as I. Jeong for the UAS:epNTR-p2a-mCherry plasmid used in this study. This work was supported by the SNUBH Research Fund (grant number 13-2020-007), by a TRC Research Grant of the Korea University Medicine and Korea Institute of Science and Technology (K2107901), by Korea University Ansan Hospital grant, by Korea University grants (K1625491, K1722121, K1811051, K1913161 and K2010921), by the Korea Medical Device Development Fund grant funded by the Korea government (the Ministry of Science and ICT, the Ministry of Trade, Industry and Energy, the Ministry of Health & Welfare, the Ministry of Food and Drug Safety) (project number 1711174253, RS-2020-KD000296), by the Korea Environment Industry & Technology Institute (KEITI) through the Technology Development Project for Safety Management of Household Chemical Products, funded by the Korea Ministry of Environment (MOE) (2020002960007, NTIS-1485017544), by the Technology Development Program (S3127902) funded by the Ministry of SMEs and Startups (MSS, Korea), by the Technology Development Program (S3305836) funded by the Ministry of SMEs and Startups (MSS, Korea), by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (NRF-2021R1F1A1062017), and by ‘Technical start-up corporation fostering project’ through the Commercialization Promotion Agency for R&D Outcomes (COMPA) grant funded by the Korea Government (MSIT) (no. RS-2023-00259877). This study was funded in part by a Research to Prevent Blindness Challenge Grant to the Ophthalmology Department at Emory University; National Institutes of Health grants R01EY028450, R01EY021592, R01EY028859 and P30EY006360; The Abraham J. and Phyllis Katz Foundation; and VA RR&D grants I01RX002806, I21RX001924 and VA RR&D C9246C (Atlanta Veterans Administration Center for Excellence in Vision and Neurocognitive Rehabilitation).
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Y.E. conceived and designed the study, acquired data, analyzed and interpreted the data, drafted the manuscript and reviewed the final version. H.-S.P. and S.K. contributed to data acquisition, data analysis and interpretation, and reviewed the final manuscript. E.K. contributed to data interpretation and reviewed the final manuscript. H.-C.P. provided experimental equipment and reviewed the final manuscript. J.S.S., J.H.B. and J.M.N. supervised the study, contributed to data interpretation and reviewed the final manuscript.
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Eom, Y., Koh, E., Park, HS. et al. Assessment of a novel color vision optomotor response assay in zebrafish larvae with red cone ablation. Lab Anim 54, 200–206 (2025). https://doi.org/10.1038/s41684-025-01586-5
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DOI: https://doi.org/10.1038/s41684-025-01586-5