Enzyme Polymorphisms

Enzyme polymorphisms refer to genetic variations in the enzymes that regulate cannabinoid and terpene synthesis in cannabis plants. These polymorphisms—caused by single nucleotide variations and other mutations in genes encoding synthase and oxidase enzymes—create measurable differences in secondary metabolite profiles across strains and individuals. Key enzymes like CBDA synthase, THCA synthase, and terpene synthases exist in multiple functional variants, leading to distinct chemotypes even within closely related lineages. Understanding these polymorphisms is foundational to cannabis breeding, as they directly influence the biochemical output of a plant without requiring environmental manipulation. Researchers and breeders study enzyme polymorphisms to map chemotype inheritance, predict offspring metabolite ratios, and stabilize desired cannabinoid and terpene phenotypes in cultivar dev

Breeders exploit enzyme polymorphisms through marker-assisted selection and controlled crosses to isolate and amplify specific chemotypes—such as high-CBD or high-THCV lines—without relying solely on phenotypic observation. Understanding which polymorphisms are heritable and which environmental factors interact with them helps stabilize commercial cultivars and predict chemotype segregation in F1