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Genetics, Vol. 168, 923-931, October 2004, Copyright © 2004
doi:10.1534/genetics.104.027649
Single-Locus Latitudinal Clines and Their Relationship to Temperate Adaptation in Metabolic Genes and Derived Alleles in Drosophila melanogaster
Efe Sezgin, David D. Duvernell1, Luciano M. Matzkin2, Yihao Duan3, Chen-Tseh Zhu, Brian C. Verrelli4 and Walter F. Eanes5
Department of Ecology and Evolution, Stony Brook University, Stony Brook, New York 11794
5 Corresponding author: Department of Ecology and Evolution, Stony Brook University, Stony Brook, NY 11794.
E-mail: walter{at}life.bio.sunysb.edu
We report a study in Drosophila melanogaster of latitudinal clines for 23 SNPs embedded in 13 genes (Pgi, Gapdh1, UGPase, Pglym78, Pglym87, Eno, Men, Gdh, Sod, Pgk, Mdh1, TreS, Treh) representing various metabolic enzymes. Our samples are from 10 populations spanning latitude from southern Florida to northern Vermont. Three new clines with latitude were detected. These are the amino acid polymorphisms in the NAD-dependent glutamate dehydrogenase (Gdh) and trehalase (Treh) genes, and a silent site polymorphism in the UDP-glucose pyrophosphorylase gene (UGPase). The result, when combined with the overall incidence and pattern of reports for six other genes (Adh, Gpdh, Pgm, G6pd, 6Pgd, Hex-C), presents a picture of latitudinal clines in metabolic genes prevalent around the branch point of competing pathways. For six of the seven amino acid polymorphisms showing significant latitudinal clines in North America, the derived allele is the one increasing with latitude, suggesting temperate adaptation. This is consistent with a model of an Afrotropical ancestral species adapting to temperate climates through selection favoring new mutations.
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