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Updated: Apr 10, 2026
Practical Use of RNA Interference: Oral Delivery of Double-stranded RNA in Liposome Carriers for Cockroaches
Published on: May 1, 2018
A scalable RNAi nanoparticle approach for lethal gene targeting in the German cockroach
Jiang Wang1, Yu Zhang1, Yu Zhao1
1State Key Laboratory of Green Pesticide, Center for R&D of Fine Chemicals of Guizhou University, Guiyang, China.
Background:
The German cockroach (Blattella germanica) is a major urban pest managed primarily with chemical insecticides, raising concerns over resistance and environmental impact. RNA interference (RNAi) offers a species-specific and sustainable alternative, but its utility depends on identifying lethal gene targets and developing efficient delivery systems.
Results:
We developed an oral-induced nanoparticle-delivered gene silencing (OI-NDGS) platform using star polycation (SPc) nanocarriers to stabilize and deliver dsRNAs in B. germanica. Twelve candidate genes, selected from lethal Tribolium castaneum homologs, were tested. Efficient transcript knockdown was achieved for all targets. Four genes (Bgsrp54k, Bgrpt3a, Bgrpt3b and Bgrpn7) produced 100% mortality with severe molting and growth defects, whereas Bghsc70-3 and Bgpp-α also yielded <7% cumulative survival at the 40-day endpoint. The identification of duplicated rpt3 transcripts in B. germanica underscores evolutionary divergence and expands proteasome-related targets for RNAi.
Conclusion:
The present study highlights species-specific lethal genes in cockroaches and validates a scalable SPc-based oral delivery system, together establishing a practical framework for RNAi biopesticide development. These advances provide both new biological insights and applied innovations for sustainable urban pest management. © 2026 Society of Chemical Industry.
