Summary
Knockout of the sws1 short-wavelength opsin gene in medaka fish larvae impairs visual function, reduces feeding behavior, and causes retinal cell apoptosis linked to downregulated phototransduction genes and increased oxidative stress. These findings underscore the importance of short-wavelength (UV/violet) photoreceptor integrity for visual system health, with potential implications for understanding how short-wave light exposure supports retinal function.
Key Findings
- sws1-/- larvae showed significantly decreased food intake and reduced total body length at 6 days post-hatching (dph) compared to wild-type controls.
- Orexigenic gene expression (npy and agrp) was significantly upregulated after feeding in sws1 knockout larvae, suggesting disrupted appetite regulation.
- Swimming speed was significantly reduced during dark-light transition stimulation in sws1-mutant larvae, indicating impaired light-driven behavioral responses.
- Ganglion cell layer (GCL) thickness was significantly increased, while lens thickness was reduced in sws1-/- larvae.
- mRNA levels of phototransduction genes (gnb3b, grk7a, grk7b, pde6c) were significantly decreased in knockout larvae.
- Increased retinal cell apoptosis and oxidative stress markers were observed in sws1-deficient medaka larvae.
Categories
Eye Health & Vision: Study demonstrates that loss of short-wave-sensitive opsin (sws1) leads to retinal cell apoptosis, oxidative stress, and impaired visual function in vertebrate larvae.
The Science of Light: Investigates the molecular role of sws1 opsin in phototransduction cascades, including downstream gene expression (gnb3b, grk7a, grk7b, pde6c) critical to understanding photoreceptor biology.
Author(s)
K Lu, J Wu, S Tang, Y Wang, L Zhang, F Chai, XF Liang
Publication Year
2023
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