Fluorescent Protein Applications in Coral Ecology

Fluorescent proteins in reef-building corals are key modulators of the light environment experienced by their symbiotic algae and play multifaceted roles in coral physiology, stress resilience and ecological adaptation. These proteins, which include green, cyan, red and chromoproteins, absorb incident light and re-emit it at longer wavelengths, thereby altering the spectral quality and intensity of light within coral tissues. Such spectral transformation can enhance photosynthetic efficiency at depth, photoprotect symbionts under high irradiance and mitigate oxidative stress during thermal anomalies. Fluorescent pigments also serve as non-invasive biomarkers of coral health, enabling real-time assessment of stress responses and wound repair processes. Recent advances in molecular ecology have revealed that gene copy number and promoter variation underlie intraspecific differences in pigment expression, providing corals with genomic flexibility to adjust pigmentation according to prevailing light regimes. Beyond fundamental insights, these proteins have been exploited in remote sensing, underwater imaging and ecological monitoring, where they facilitate species identification, depth mapping and early detection of bleaching events. The global significance of fluorescent proteins extends from improving our understanding of coral adaptation to aiding conservation strategies in the face of climate change.

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Fluorescent Protein Applications in Coral Ecology publication trend

The graph below shows the total number of articles in fluorescent protein applications in coral ecology across all publications each year (not limited to Nature Index journals).

Technical terms

GFP-like proteins: Homologues of the green fluorescent protein that absorb and emit light at specific wavelengths in coral tissues.

Photoconvertible red fluorescent proteins (pcRFPs): Fluorescent proteins capable of switching emission from green to red when exposed to defined light wavelengths.

Mesophotic reefs: Coral ecosystems found at intermediate depths (approximately 30–150 m) where light penetration is limited.

Symbiodiniaceae: A family of dinoflagellate algae living symbiotically within coral tissues, contributing to host nutrition via photosynthesis.

Thermal bleaching: A stress response in corals during which elevated temperatures cause the expulsion of symbiotic algae, leading to tissue whitening and potential mortality.

References

1. Diversity and function of fluorescent molecules in marine animals. Biological Reviews (2024).
2. Linking coral fluorescence phenotypes to thermal bleaching in the reef-building Galaxea fascicularis from the northern South China Sea. Marine Life Science & Technology (2023).
3. Acclimatization of symbiotic corals to mesophotic light environments through wavelength transformation by fluorescent protein pigments. Proceedings of the Royal Society B (2017).
4. Locally accelerated growth is part of the innate immune response and repair mechanisms in reef-building corals as detected by green fluorescent protein (GFP)-like pigments. Coral Reefs (2012).
5. Fluorescent protein‐mediated colour polymorphism in reef corals: multicopy genes extend the adaptation/acclimatization potential to variable light environments. Molecular Ecology (2015).