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Selection on Nuclear Genes in a Pinus Phylogeny
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Evolutionary Functional Genomics.
Department of Biology, University of Oulu, Oulu, Finland.
Institute of Dendrology, Polish Academy of Sciences, Kórnik, Poland.
Department of Biology, University of Oulu, Oulu, Finland.
2009 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 26, no 4, 893-905 p.Article in journal (Refereed) Published
Abstract [en]

In this study, we investigate natural selection in a pine phylogeny. DNA sequences from 18 nuclear genes were used toconstruct a very well-supported species tree including 10 pine species. This tree is in complete agreement witha previously reported supertree constructed from morphological and molecular data, but there are discrepancies withprevious chloroplast phylogenies within the section Pinus. A significant difference in evolutionary rate between Piceaand Pinus was found, which could potentially indicate a lower mutation rate in Picea, but other scenarios are alsopossible. Several approaches were used to study selection patterns in a set of 21 nuclear genes in pines and in some casesin Picea and Pseudotsuga. The overall pattern suggests efficient purifying selection resulting in low branch-specific dn/dsratios with an average of 0.22, which is similar to other higher plants. Evidence for purifying selection was common andfound on at least 55% of the branches. Evidence of positive selection at several sites was found in a phytocyanin homologand significant differences in dn/ds among the branches in the gene tree in dehydrin 1. Several genes suitable for furtherphylogenetic analysis at various levels of divergence were identified.

 

Place, publisher, year, edition, pages
2009. Vol. 26, no 4, 893-905 p.
Keyword [en]
selection, phylogeny, pine, nuclear genes, sequence polymorphisms, gene trees
National Category
Biological Sciences
Research subject
Genetics
Identifiers
URN: urn:nbn:se:uu:diva-100548DOI: 10.1093/molbev/msp010ISI: 000264188700015OAI: oai:DiVA.org:uu-100548DiVA: diva2:210493
Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved

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Publisher's full texthttp://intl-mbe.oxfordjournals.org/cgi/content/abstract/26/4/893

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Palmé, Anna

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