A whole genome atlas of 81 Psilocybe genomes as a resource for psilocybin production.

The Psilocybe genus produces psychoactive compounds like psilocybin, psilocin, baeocystin, and aeruginascin. The widespread ability to synthesize psilocybin is thought to come from a horizontal gene transfer of a ~20Kb gene cassette. A new high-quality reference genome from long-read sequencing revealed variation in this cassette and enabled shotgun sequencing of spores from many strains. Here, 81 new Psilocybe genomes were assembled and compared to the P. envy reference. Surprisingly, Psilocybe galindoi, Psilocybe tampanensis, and Psilocybe azurescens lack sequence coverage for the known synthesis pathway but show amino acid homology to an alternative pathway, suggesting convergent evolution of psilocybin synthesis.

Study at a glance

Abstract

The Psilocybe genus is well known for the synthesis of valuable psychoactive compounds such as Psilocybin, Psilocin, Baeocystin and Aeruginascin. The ubiquity of Psilocybin synthesis in Psilocybe has been attributed to a horizontal gene transfer mechanism of a ~20Kb gene cassette. A recently published highly contiguous reference genome derived from long read single molecule sequencing has underscored interesting variation in this Psilocybin synthesis gene cassette. This reference genome has also enabled the shotgun sequencing of spores from many Psilocybe strains to better catalog the genomic diversity in the Psilocybin synthesis pathway. Here we present the de novo assembly of genomes of 81 Psilocybe genomes compared to the P.envy reference genome. Surprisingly, the genomes of Psilocybe galindoi , Psilocybe tampanensis and Psilocybe azurescens lack sequence coverage over the previously described Psilocybin synthesis pathway but do demonstrate amino acid sequence homology to an alternative pathway and may illuminate previously proposed convergent evolution of Psilocybin synthesis.