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Originally published as Genetics Published Articles Ahead of Print on January 16, 2006.
Genetics, Vol. 172, 2613-2620, April 2006, Copyright © 2006
doi:10.1534/genetics.105.051789
Genetically Engineered Underdominance for Manipulation of Pest Populations: A Deterministic Model
Krisztian Magori1 and Fred Gould
Department of Entomology, North Carolina State University, Raleigh, North Carolina 27607
1 Corresponding author: Department of Entomology, North Carolina State University, 840 Method Rd., Unit 1, Raleigh, NC 27607.
E-mail: kmagori{at}ncsu.edu
We theoretically investigate the potential for introgressing a desired engineered gene into a pest population by linking the desired gene to DNA constructs that exhibit underdominance properties. Our deterministic model includes two independently segregating engineered constructs that both carry a lethal gene, but suppress each other. Only genotypes containing both or neither construct are viable. Both constructs also carry the desired gene with an independent regulatory mechanism. We examine the minimal number of individuals of an engineered strain that must be released into a natural population to successfully introgress the desired gene. We compare results for strains carrying single and multiple insertions of the constructs. When there are no fitness costs associated with the inserted constructs (when the lethal sequences are not expressed), the number of individuals that must be released decreases as the number of insertions in the genome of the released strain increases. As fitness costs increase, the number of individuals that must be released increases at a greater rate for release strains with more insertions. Under specific conditions this results in the strain with only a single insertion of each construct being the most efficient for introgressing the desired gene. We discuss practical implications of our findings.
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