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Drift and Directional Selection Are the Evolutionary Forces Driving Gene Expression Divergence in Eye and Brain Tissue of Heliconius Butterflies
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology. Ludwig Maximilians Univ Munchen, Div Evolutionary Biol, D-82152 Planegg Martinsried, Germany.
Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA.
Ludwig Maximilians Univ Munchen, Div Evolutionary Biol, D-82152 Planegg Martinsried, Germany;Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA;Ludwig Maximilians Univ Munchen, Dept Earth & Environm Sci Paleontol & Geobiol, D-80333 Munich, Germany;Ludwig Maximilians Univ Munchen, GeoBio Ctr, D-80333 Munich, Germany.
2019 (English)In: Genetics, ISSN 0016-6731, E-ISSN 1943-2631, Vol. 213, no 2, p. 581-594Article in journal (Refereed) Published
Abstract [en]

Investigating gene expression evolution over micro- and macroevolutionary timescales will expand our understanding of the role of gene expression in adaptation and speciation. In this study, we characterized the evolutionary forces acting on gene expression levels in eye and brain tissue of five Heliconius butterflies with divergence times of similar to 5-12 MYA. We developed and applied Brownian motion (BM) and Ornstein-Uhlenbeck (OU) models to identify genes whose expression levels are evolving through drift, stabilizing selection, or a lineage-specific shift. We found that 81% of the genes evolve under genetic drift. When testing for branch-specific shifts in gene expression, we detected 368 (16%) shift events. Genes showing a shift toward upregulation have significantly lower gene expression variance than those genes showing a shift leading toward downregulation. We hypothesize that directional selection is acting in shifts causing upregulation, since transcription is costly. We further uncovered through simulations that parameter estimation of OU models is biased when using small phylogenies and only becomes reliable with phylogenies having >= 50 taxa. Therefore, we developed a new statistical test based on BM to identify highly conserved genes (i.e., evolving under strong stabilizing selection), which comprised 3% of the orthoclusters. In conclusion, we found that drift is the dominant evolutionary force driving gene expression evolution in eye and brain tissue in Heliconius. Nevertheless, the higher proportion of genes evolving under directional than under stabilizing selection might reflect species-specific selective pressures on vision and the brain that are necessary to fulfill species-specific requirements. Characterization of gene expression patterns across species - and the evolutionary forces driving them - can reveal processes that have remained conserved across species, as well as those that have changed in a species- specific manner...

Place, publisher, year, edition, pages
2019. Vol. 213, no 2, p. 581-594
Keywords [en]
Brownian motion, natural selection, stabilizing selection, Ornstein-Uhlenbeck, RevBayes
National Category
Genetics Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-396649DOI: 10.1534/genetics.119.302493ISI: 000489319400016PubMedID: 31467133OAI: oai:DiVA.org:uu-396649DiVA, id: diva2:1370252
Funder
Knut and Alice Wallenberg FoundationAvailable from: 2019-11-14 Created: 2019-11-14 Last updated: 2019-11-14Bibliographically approved

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