Scientists at the University of Galway and an international consortium have discovered that coral reefs contain an almost entirely unstudied universe of microbial life, publishing a study in Nature that reconstructed the genomes of 645 microbial species from 99 coral reefs across 32 Pacific islands, with more than 99 percent of those species never having been genetically described before. The research, part of the Tara Pacific expedition, found that each coral species hosts its own unique community of microbial partners that produce a remarkable range of bioactive chemical compounds, with the biosynthetic potential of coral reef microbiomes matching or exceeding that of sponges, which have traditionally been one of the most productive sources of medically useful natural compounds. Of the more than 4,000 microbial species identified across the study, only 10 percent had any existing genetic information, and fewer than 1 percent of the species found exclusively in the Tara Pacific samples had ever been studied at all. The scientists call what they have found a molecular library, a term that gestures at the scale of what exists inside reefs that have barely been looked at.
The researchers identified previously unknown microorganisms living within reef-building corals that produce new enzymes with potential applications in biotechnology and medicine, and say the findings open a direction for pharmaceutical and industrial discovery that has barely been touched. The study also carries a conservation argument scientists say is often missed: when coral reefs are lost to warming oceans and bleaching events, the loss is not only ecological but chemical, eliminating microbial communities and the compounds they produce before anyone has had a chance to study them. Dr. Maggie Reddy of the Ryan Institute said the findings make clear how much we still do not know about reefs, and that the gap between what exists and what has been explored is enormous. Professor Olivier Thomas, who co-led the research, called it a clear call to action to protect coral reefs not only as ecosystems but as irreplaceable sources of future scientific breakthroughs.
Source: https://www.sciencedaily.com/releases/2026/05/260506225229.htm
