Patterns of fluorescent protein expression in Scleractinian corals

Area of Science:

• Marine Biology
• Biochemistry
• Ecology

Background:

• Biofluorescence is rare, with Anthozoa (corals) dominating known species expressing fluorescent proteins.
• Reef-building corals (Scleractinia) commonly exhibit green fluorescent proteins in specific anatomical patterns.

Purpose of the Study:

• To investigate the distribution and patterns of biofluorescence in 33 coral species from the Great Barrier Reef.
• To document novel occurrences of biofluorescence in coral species.
• To analyze the anatomical localization and potential function of fluorescent proteins in corals.

Main Methods:

• Surveyed 33 coral species across 8 families on the Great Barrier Reef.
• Documented the presence and patterns of biofluorescence.
• Analyzed fluorescent emission spectra (green and red dominant).
• Examined the anatomical distribution of fluorescent proteins relative to zooxanthellae.

Main Results:

• Biofluorescence was newly reported in 28 of the 33 studied coral species.
• Dominant emissions were green (480-520 nm) and red (580-600 nm).
• Fluorescent proteins were localized in three distinct patterns: highlighted, uniform, and complementary.
• No significant overlap was found between fluorescent protein distribution and zooxanthellae presence.
• Coral fluorescent protein distribution patterns were nonrandom.

Conclusions:

• The targeted, nonrandom distribution of fluorescent proteins in corals suggests a functional role.
• Coral biofluorescence may serve as a signaling mechanism, potentially for inter-organism communication.
• Further research is needed to elucidate the precise signaling functions of coral fluorescent proteins.