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Updated: Jan 15, 2026
Protocols for CRISPR/Cas9 Mutagenesis of the Oriental Fruit Fly Bactrocera dorsalis
Published on: September 28, 2022
Precision primer designing via genome-wide divergence scanning: resolving quarantine-critical sibling species in the
Haotian Lei1,2, Aonan Ru3, Cheng Sun4
1State Key Laboratory of Agricultural and Forestry Biosecurity and Department of Entomology, College of Plant Protection, China Agricultural University, Beijing, China.
Background:
Traditional molecular diagnostics for cryptic species often rely on limited genetic markers (e.g., single mitochondrial or ribosomal RNA genes), sometimes with insufficient resolution. Here, we present a genome-wide divergence scanning approach to design robust species-specific primers, using the economically important Bactrocera dorsalis complex as a model system.
Results:
By analyzing population genomic data spanning the species' global distributions, we identified eight differential loci that are potentially useful for species identification. Based on one locus that contains insertions/deletions (indels) between Bactrocera carambolae and B. dorsalis, we designed a pair of general primers amplifying both target species and two pairs of species-specific primers (one for each species). Specificity testing, conducted on the target species and nine related species, demonstrated 100% accuracy for both species-specific primer pairs. Additionally, sensitivity tests showed that both primers could detect concentrations as low as 1 ng μL-1.
Conclusion:
This case study demonstrates how genome-enabled primer design can overcome the limitations of traditional locus choice for distinguishing cryptic species. The pipeline is readily adaptable to other taxonomically challenging pests, potentially offering a transformative tool for phytosanitary diagnostics and beyond. © 2025 Society of Chemical Industry.
