Date of Award
Great Lakes Institute for Environmental Research
Cristescu, Melania (Great Lakes Institute for Environmental Research)
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Understanding the genetic basis of adaptation is a central task for evolutionary biology. Here, I examined how Ldh gene expression contributes to the adaptation of Daphnia pulex and Daphnia pulicaria by using a controlled acclimation experiment. There were no statistically significant changes (p>0.1) in gene expression due to changes in temperature, dissolved oxygen. However, both LdhA and LdhB expression were significantly different in each type of Daphnia (pond, lake or hybrid) suggesting that these genes could contribute to adaptation or could be linked to loci that do. LdhA was expressed significantly more than LdhB (p<0.005), in all clones. Analysis of the protein structures of LDHA and LDHB revealed that both are functional LDH proteins, with very similar secondary structures. These results confirm that while the protein structures of LdhA and LdhB where very similar, expression of these genes could contribute to the adaptation of pond and lake Daphnia.
Demiri, Bora, "Genetic and expression changes in Lactate dehydrogenase as potential mechanism for promoting adaptation" (2011). Electronic Theses and Dissertations. 153.