Genetic enablers underlying the clustered evolutionary origins of C4 photosynthesis in angiosperms.

Autor:	Christin PA; Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom Department of Ecology and Evolutionary Biology, Brown University p.christin@sheffield.ac.uk., Arakaki M; Department of Ecology and Evolutionary Biology, Brown University Departamento de Botánica, Facultad de Ciencias Biológicas & Museo de Historia Natural-UNMSM, Lima, Peru., Osborne CP; Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom., Edwards EJ; Department of Ecology and Evolutionary Biology, Brown University.
Jazyk:	angličtina
Zdroj:	Molecular biology and evolution [Mol Biol Evol] 2015 Apr; Vol. 32 (4), pp. 846-58. Date of Electronic Publication: 2015 Jan 12.
DOI:	10.1093/molbev/msu410
Abstrakt:	The evolutionary accessibility of novel adaptations varies among lineages, depending in part on the genetic elements present in each group. However, the factors determining the evolutionary potential of closely related genes remain largely unknown. In plants, CO2-concentrating mechanisms such as C4 and crassulacean acid metabolism (CAM) photosynthesis have evolved numerous times in distantly related groups of species, and constitute excellent systems to study constraints and enablers of evolution. It has been previously shown for multiple proteins that grasses preferentially co-opted the same gene lineage for C4 photosynthesis, when multiple copies were present. In this work, we use comparative transcriptomics to show that this bias also exists within Caryophyllales, a distantly related group with multiple C4 origins. However, the bias is not the same as in grasses and, when all angiosperms are considered jointly, the number of distinct gene lineages co-opted is not smaller than that expected by chance. These results show that most gene lineages present in the common ancestor of monocots and eudicots produced gene descendants that were recruited into C4 photosynthesis, but that C4-suitability changed during the diversification of angiosperms. When selective pressures drove C4 evolution, some copies were preferentially co-opted, probably because they already possessed C4-like expression patterns. However, the identity of these C4-suitable genes varies among clades of angiosperms, and C4 phenotypes in distant angiosperm groups thus represent genuinely independent realizations, based on different genetic precursors. (© The Author 2015. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
Databáze:	MEDLINE
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