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Monitoring the spread of the knockdown resistance allele kdr in areas of extensive pyrethroid use is critical to vector-control projects. Currently available methods for detecting kdr from DNA samples are characterized by poor amplification, time-consuming steps, and primers that exhibit frequent null alleles. We describe a new PCR diagnostic that uses fluorescent primers based on conserved priming sites and enables simple detection of the kdr allele on a sequencer. Using samples from a West African Anopheles gambiae population, we show that the new PCR yielded significantly higher rates of amplification and more accurate estimates of kdr frequency. The method works equally well for the leucine to phenylalanine substitution found in West Africa and the East African leucine to serine substitution.
Received October 18, 2005. Accepted for publication November 8, 2005.
Acknowledgments: The authors thank Claudio Meneses for help with the maintenance of mosquito strains.
Financial support: This project was supported by NIAID/NIH grant AI40308 to G.C.L.
* Address correspondence to Frederic Tripet, Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Staffordshire, ST5 5BG, UK. E-mail: frtripet{at}yahoo.com
Authors addresses: Frederic Tripet, Jennifer Wright, and Greg Lanzaro, Department of Entomology, University of California Davis, 1 Shields Ave., Davis, CA 95616-8584, E-mails: ftripet{at}ucdavis.edu, jwright{at}ucdavis.edu and glanzaro{at}ucdavis.edu. Frederic Tripet (new address), Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Staffordshire, ST5 5BG, UK.
Reprint requests: Frederic Tripet, Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Stafford-shire, ST5 5BG, UK, E-mail: frtripet{at}yahoo.com.
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