Geographic distributions of Idh -1 alleles in a cricket are linked to differential enzyme kinetic performance across thermal environments |
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Authors: | Diana L Huestis Brenda Oppert Jeremy L Marshall |
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Institution: | (1) Department of Entomology, Kansas State University, 66506 Manhattan, KS, USA;(2) Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 12735 Twinbrook Parkway, 20852 Rockville, MD, USA;(3) USDA ARS Grain Marketing and Production Research Center, 66502 Manhattan, KS, USA |
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Abstract: | Background Geographic clines within species are often interpreted as evidence of adaptation to varying environmental conditions. However,
clines can also result from genetic drift, and these competing hypotheses must therefore be tested empirically. The striped
ground cricket, Allonemobius socius, is widely-distributed in the eastern United States, and clines have been documented in both life-history traits and genetic
alleles. One clinally-distributed locus, isocitrate dehydrogenase (Idh -1), has been shown previously to exhibit significant correlations between allele frequencies and environmental conditions
(temperature and rainfall). Further, an empirical study revealed a significant genotype-by-environmental interaction (GxE)
between Idh -1 genotype and temperature which affected fitness. Here, we use enzyme kinetics to further explore GxE between Idh -1 genotype and temperature, and test the predictions of kinetic activity expected under drift or selection. |
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