Coral corals sense light without eyes, using chloride ions and pH levels.

Recent findings reveal that reef-building corals utilize a previously unknown mechanism to sense visible light, despite lacking eyes. Their opsins, specifically the ASO-II group, use chloride ions from the environment as counterions, enabling a reversible switch between UV and visible light sensitivity based on pH levels. This adaptation may allow corals to adjust light sensitivity in response to changes in their internal environment, influenced by symbiotic algae. The discovery not only advances our understanding of coral photoreception but also suggests potential applications in biotechnology, such as the development of optogenetic tools with pH-dependent wavelength sensitivity.

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