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• W2352023405 abstract "GENOME WIDE EPIGENETIC ANALYSES OF ARAPTUS ATTENUATUS, A BARK BEETLE By Chitra Seshadri, Bachelor of Science. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University. Virginia Commonwealth University, 2016. Rodney Dyer, PhD Department of Biology, Center for Environmental Studies Phylogeographic studies have relied on surveying neutral genetic variation in natural populations as a way of gaining better insights into the evolutionary processes shaping present day population demography. Recent emphasis on understanding putative adaptive variation have brought to light the role of epigenetic variation in influencing phenotypes and the mechanisms underlying local adaptation. While much is known about how methylation acts at specific loci to influence known phenotypes, there is little information on the spatial genetic structure of genome-wide patterns of methylation and the extent to which it can extend our understanding of both neutral and putatively adaptive processes. This research examines spatial genetic structure using paired nucleotide and methylation genetic markers in the Sonoran bark beetle, Araptus attenuatus, for which we have a considerable knowledge about its neutral demographic history, demography, and factors influencing ongoing genetic connectivity. Using the msAFLP approach, we attained 703 genetic markers. Of those, 297 were polymorphic in both nucleotide (SEQ) and methylation (METH) were assayed from 20 populations collected throughout the species range. Of the paired SEQ and METH locis, the METH were both more frequent (16% vs. 7%), maintained more diversity (Shannon IMeth = 0.361 vs. ISeq=0.272), and had more amongpopulation genetic structure (ΦST; Meth = 0.035 vs. ΦST; Seq= 0.008) than their paired SEQ loci. Interpopulation genetic distance in both SEQ and METH markers were highly correlated, with 16% of the METH loci having sufficient signal to reconstruct phylogeographic history. Allele frequency variation at five loci (two SEQ and three METH) showed significant relationships with at-site bioclimatic variables suggesting the need for subsequent analysis addressing nonneutral evolution. These results suggest that methylation can be as informative as nucleotide variation when examining spatial genetic structure for phylogeography, connectivity, and, identifying putatively adaptive genetic variance." @default.
• W2352023405 created "2016-06-24" @default.
• W2352023405 creator A5073352613 @default.
• W2352023405 date "2016-01-01" @default.
• W2352023405 modified "2023-09-23" @default.
• W2352023405 title "Genome wide epigenetic analyses of Araptus attenuatus, a bark beetle" @default.
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• W2352023405 doi "https://doi.org/10.25772/k1zm-mv22" @default.
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