A groundbreaking synthetic process has successfully engineered bacteria to produce Gadusol, a natural compound that protects transparent fish eggs from harmful sunlight. This innovation brings us closer to creating a sustainable sunscreen alternative for humans, which is more environmentally friendly.

Naturally found in species like zebrafish, salmon, and sturgeon eggs, as well as in coral, Gadusol offers vital protection against UV damage. Its limited availability from natural sources makes it impractical for widespread use as a sunscreen.

A team led by Jiang Ping at Jiangnan University in China successfully inserted zebrafish genes into Escherichia coli to provide the necessary enzymes for Gadusol synthesis. The research team enhanced Gadusol production by using small RNA molecules and optimizing growth conditions, achieving an impressive nearly 93-fold increase—from 45.2 mg to 4.2 grams per liter of culture medium.

Initial experiments indicate that Gadusol possesses antioxidant properties comparable to vitamin C, potentially neutralizing harmful free radicals that damage cells. However, researchers from New Scientist did not respond to interview requests regarding further details.

Unlike melanin, Gadusol is transparent, effectively blocking UV rays while allowing for stealth in organisms. James Gagnon from the University of Utah, a key contributor to the research, noted, “I don’t think we necessarily get the credit we deserve. This is an amazing molecule.” Gagnon emphasized the need for further studies but mentioned that Gadusol is likely safe for humans and the environment since many animals already utilize it. Its transparency avoids the milky residue left by conventional sunscreens.

“Everyone is hinting this could be a great sunscreen for humans,” Gagnon explains. “However, two hurdles remain before Gadusol can be commercialized: developing a cost-effective manufacturing method and finding chemical combinations that provide long-lasting formulations.”

“While Gadusol may be the active ingredient, future sunscreen products will involve a variety of components to ensure Gadusol adheres to the skin and resists washing away,” Gagnon states. “There is still significant work to be done in materials science.”