Genetic markers unlock cannabis variety identification

Cannabis identification just got more precise. Researchers have completed the first comprehensive analysis of simple sequence repeats (SSRs) in cannabis chloroplast DNA—the genetic material found in plant cell structures. By examining six different cannabis cultivars, they discovered 30-46 SSRs per plant, with mononucleotide repeats being the most common type. These genetic markers are distributed throughout the chloroplast genome, with the majority found in intergenic regions (the non-coding spaces between genes). Most significantly, the team identified several genotype-specific SSRs that differ between cannabis varieties, enabling precise differentiation between strains.

The practical applications of this research are substantial. Law enforcement agencies, customs officials, and forensic investigators can now use these newly identified genetic markers—particularly in the atpH-atpI and ndhF-rpl32 regions—to definitively identify cannabis cultivars and track trafficking across borders. This is the first time these specific regions have been reported as potential genetic markers for cannabis. Additionally, cannabis breeders and researchers can use these SSR profiles to better understand genetic diversity within the species and improve breeding programs by selecting for desired traits.

Beyond forensics and law enforcement, this research contributes to fundamental cannabis science by establishing a baseline for understanding genetic variation within the species. The comprehensive cpSSR profile created in this study provides a genetic fingerprinting tool that works regardless of whether plants are flowering, vegetative, or processed—making it more reliable than phenotypic identification methods. As cannabis legalization expands globally, having robust, scientifically-validated methods to identify and distinguish between cultivars becomes increasingly important for regulatory compliance, quality control, and legitimate research purposes.