The psychedelic compound psilocybin has fascinated humans for years. It alters perception, expands consciousness, and is even being tested as a treatment for depression. However, researchers are still puzzled by the purpose of psilocybin for the fungi that produce it.
A recent study has shown that different groups of mushrooms developed the ability to produce psilocybin on separate occasions. These two unrelated fungi groups evolved different biochemical pathways that both resulted in the same compound.
The discovery offers an example of what biologists recognize as an example of convergent evolution in nature; more significantly, it is also prompting scientists to question the purpose behind why these fungi produced psilocybin in the first place.
Two Paths, One Molecule
Psilocybin is commonly associated with Psilocybe mushrooms, which grow on manure and decaying wood. Researchers from Friedrich Schiller University Jena and the Leibniz Institute for Natural Product Research recently discovered that fiber cap mushrooms use a completely different pathway to produce psilocybin.
This fungus did not follow the same genetic pathway as Psilocybe, but still separately evolved to produce psilocybin. “It was like looking at two different workshops, but both ultimately delivering the same product,” explained lead author Tim Schäfer.
Nature’s Duplicate Invention
The team confirmed their findings by analyzing enzymes from fiber cap mushrooms in the lab. They found that the reaction sequence is entirely different from that seen in Psilocybe species. Yet, both lineages ultimately converge to produce psilocybin.
“This concerns the biosynthesis of a molecule that has a very long history with humans,” said senior author Dirk Hoffmeister. “Here, nature has actually invented the same active compound twice.”
Biologists refer to this phenomenon as convergent evolution. This occurs when unrelated species independently develop a similar feature or function in response to similar environmental pressures.
The Unanswered Question
The reason why two unrelated groups of fungi evolved the ability to produce the same psychedelic compound is still unknown.
“The real answer is: we don’t know,” Hoffmeister admitted. “Nature does nothing without reason. So there must be an advantage to both fiber cap mushrooms in the forest and Psilocybe species on manure or wood mulch producing this molecule—we just don’t know what it is yet.”
Some scientists hypothesize that psilocybin acts as a defense mechanism. When damaged, Psilocybe mushrooms bruise blue due to the breakdown of psilocybin into reactive byproducts. These compounds may disrupt behavior in insects and other organisms that feed on the fungi.
Expanding the Biotechnological Toolkit
Although scientists have not determined the evolutionary function of psilocybin, this discovery has practical implications for science and medicine. Identifying a new enzyme system for psilocybin production expands the available biochemical methods for biotechnological applications.
“Now that we know about additional enzymes, we have more tools in our toolbox for the biotechnological production of psilocybin,” Hoffmeister said.
Psilocybin is currently being studied for potential use as an antidepressant. Clinical trials indicate that this alternative shows promise for patients who have not responded to previous treatments. However, translating this promise into a real-world application still remains difficult due to challenges in scaling production.
The enzymes found in fiber cap mushrooms could also help researchers design bioreactors that can produce psilocybin more efficiently. “We hope that our results will contribute to the future production of psilocybin for pharmaceuticals in bioreactors without the need for complex chemical syntheses,” Schäfer added.
An Unknown Purpose
Scientists intend to keep investigating the evolutionary origins of these separate pathways. They are also searching for additional fungi that are capable of producing psilocybin. These discoveries also support efforts to develop psychedelics as a practical treatment for mental health conditions.
The detection of psilocybin in multiple, unrelated fungal lineages suggests a potentially important role for the compound in nature. Still, the true evolutionary purpose of psilocybin remains a mystery to scientists. With future studies, additional clues to the origins of this unique compound may be discovered, and perhaps even answers to the longstanding questions about what mysterious role it plays in the natural world.
Austin Burgess is a writer and researcher with a background in sales, marketing, and data analytics. He holds a Master of Business Administration and a Bachelor of Science in Business Administration, along with a certification in Data Analytics. His work combines analytical training with a focus on emerging science, aerospace, and astronomical research.