Evolutionary analysis
The genes responsible for producing psilocybin and amatoxins likely entered the genus Galerina through at least two separate instances of horizontal gene transfer, a process in which genetic material moves between distantly related organisms rather than being passed down through generations.
Bryn Dentinger, a mycologist at the University of Utah and curator of mycology at the Natural History Museum of Utah, helped guide the team's evolutionary analysis.
"Horizontal gene transfer is like if we shook hands and some of my DNA incorporated into your genome," said co-author Dentinger, an associate professor in the School of Biological Sciences at the U and curator of mycology at the Natural History Museum of Utah. "Two independent horizontal gene transfer events for these specialized metabolites in one mushroom genus are unheard of."