News in Brief: Bedbugs raise genetic defense against pesticides
Insects turn on several genes to stave off effects of insecticides
Web edition: March 14, 2013
Insects turn on several genes to stave off effects of insecticides
By Tina Hesman Saey
Web edition: March 14, 2013
Tough Bugs
Bedbugs (adults, nymphs and eggs shown) have developed multiple layers of resistance to pesticides, making it hard to control their populations.
Credit: Michael F. Potter
To escape the sting of insecticides, bedbugs boost activity of certain genes in their shells, a new study shows. Bedbugs are notorious for escaping unharmed by pesticides; understanding how the insects escape death could lead to better ways to fight the pests.
Researchers led by Subba Palli of the University of Kentucky in Lexington collected 21 groups of common bedbugs, Cimex lectularius, from four Midwestern cities. The researchers examined the activity of genes that slough off the effects of pyrethroid pesticides, a category of insecticide in some of the most common household bug sprays.
Bedbugs turn on diverse genes in their outer covering, called the cuticle or integument, the team reports March 13 in Scientific Reports. Those genes detoxify pesticides, stop them from penetrating and pump out the insecticides before they can reach the insects? nerve cells, the researchers found. An additional pesticide resistance gene called kdr is active in the nerve cells, giving bedbugs multiple layers of protection. The scientists know of no other insects that use such a multipronged defense.
Citations
F. Zhu et al. Bed bugs evolved unique adaptive strategy to resist pyrethroid insecticides. Scientific Reports Vol. 3, March 14, 2013. DOI: 10.1038/srep01456. [Go to]
Suggested Reading
S. Milius. Do-it-yourself bed-bug detector. Science News Vol. 177, January 16, 2010, p. 8. Available online: [Go to]
S. Milius. Milius versus the bed bugs. Science News online, January 8, 2010. Available online: [Go to]
S. Milius. Scent of alarm identifies male bed bugs. Science News Vol. 176, November 21, 2009, p. 13. Available online: [Go to]
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