Cannabinoid Synthases

Cannabinoid synthases are enzymes responsible for producing cannabinoids like THC and CBD through biosynthetic pathways in cannabis flowers. These protein catalysts convert precursor molecules (typically cannabigerolic acid, or CBGA) into distinct cannabinoid compounds through oxidative cyclization and other enzymatic reactions. Different synthase variants and their expression levels directly influence the cannabinoid profile of a cultivar—determining whether a plant produces primarily THC, CBD, or a balanced ratio. Research into synthase genetics has revealed that cannabinoid production is controlled by a small number of key genes, making it a tractable target for selective breeding. Understanding synthase function helps breeders develop stable lines with predictable chemical profiles and has become foundational to modern cannabis genetics work.

Breeders leverage cannabinoid synthase expression patterns to create consistent chemotypes—high-THC, high-CBD, and balanced strains. By selecting parent plants with known synthase gene variants, breeders can stabilize desired cannabinoid ratios across generations with greater precision.