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Genetic Basis of Natural Variation in D. melanogaster Antibacterial Immunity
Brian P. Lazzaro,1*Bonnielin K. Sceurman,2Andrew G. Clark3
Many genes involved in Drosophila melanogaster innate immuneprocesses have been identified, but whether naturally occurringpolymorphism in these genes leads to variation in immune competenceamong wild flies has not been tested. We report here substantialvariability among wild-derived D. melanogaster in the abilityto suppress infection by a Gram-negative entomopathogen, Serratiamarcescens. Variability in immune competence was significantlyassociated with nucleotide polymorphism in 16 innate immunitygenes, corresponding primarily to pathogen recognition and intracellularsignaling loci, and substantial epistasis was detected betweenintracellular signaling and antimicrobial peptide genes. Variationin these genes, therefore, seems to drive variability in immunocompetenceamong wild Drosophila.
1 Department of Entomology, 4138 Comstock Hall, Cornell University, Ithaca, NY 14853, USA. 2 Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health, Building 8, Room 323, 8 Center Drive MSC 0840, Bethesda, MD 20892, USA. 3 Department of Molecular Biology and Genetics, 107 Biotechnology Building, Cornell University, Ithaca, NY 14853, USA.
* To whom correspondence should be addressed: bl89{at}cornell.edu
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Appl. Envir. Microbiol.
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S. J. Macdonald, T. Pastinen, and A. D. Long (2005)
Genetics
171, 1741-1756
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Female choice for male immunocompetence: when is it worth it?.