Gene Expression Pathways

Gene expression pathways in cannabis refer to the molecular mechanisms that regulate which compounds are synthesized during plant development. These pathways determine when and how much of each terpene, cannabinoid, and flavonoid a plant produces across its lifecycle. Breeders and researchers study these regulatory networks to understand phenotypic variation—why genetically similar plants can express different chemical profiles under various environmental conditions. Gene expression is controlled by both genetic factors (DNA sequences) and epigenetic factors (chemical modifications that turn genes on or off without changing DNA itself). Understanding these pathways is fundamental to predictable breeding programs and standardizing cultivar chemistry.

Breeders leverage knowledge of gene expression pathways to stabilize desired terpene profiles across generations and predict offspring chemistry more accurately. By selecting parent plants with consistent expression patterns, rather than relying solely on cannabinoid ratios, breeding programs can create more stable, reproducible cultivars.