Cannabinoid Synthases

Cannabinoid synthases are the enzyme systems responsible for biosynthesizing cannabinoids—primary metabolites specific to Cannabis sativa. The major known synthases include THCAS (tetrahydrocannabinolic acid synthase) and CBDAS (cannabidiolic acid synthase), which convert cannabigerolic acid (CBGA) into THCA and CBDA respectively. These enzymes are encoded by genes located on the Cannabis genome and their expression levels are largely determined by genetic inheritance patterns. The ratio and activity of these synthases directly influence the chemotype of a plant—whether it produces primarily THC-dominant, CBD-dominant, or balanced cannabinoid profiles. Understanding cannabinoid synthase genetics has become foundational to modern breeding programs seeking to stabilize specific cannabinoid ratios across generations.

Breeders use molecular markers linked to cannabinoid synthase genes to select for consistent chemotypes in F1 and stabilized lines. Knowledge of synthase expression helps breeding programs develop true-breeding cultivars with predictable cannabinoid profiles and supports research into rare or novel cannabinoid production.