The GC-Rich Mitochondrial and Plastid Genomes of the Green Alga Coccomyxa Give Insight into the Evolution of Organelle DNA Nucleotide Landscape

Authors

David Roy Smith, University of British ColumbiaFollow
Fabien Burki, University of British Columbia
Takashi Burki, Hiroshima University
Jane Grimwood, HudsonAlpha Genome Sequencing Center
Igor V, Grigoriev, Department of Energy Joint Genome Institute
James L. Van Etten, University of Nebraska-LincolnFollow
Patrick J. Keeling, University of British Columbia

ORCID IDs

James L. Van Etten

Date of this Version

2011

Citation

Smith DR, Burki F, Yamada T, Grimwood J, Grigoriev IV, et al. (2011) The GC-Rich Mitochondrial and Plastid Genomes of the Green Alga Coccomyxa Give Insight into the Evolution of Organelle DNA Nucleotide Landscape. PLoS ONE 6(8): e23624. doi:10.1371/journal.pone.0023624

Comments

Copyright 2011 Smith et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License.

Abstract

Most of the available mitochondrial and plastid genome sequences are biased towards adenine and thymine (AT) over guanine and cytosine (GC). Examples of GC-rich organelle DNAs are limited to a small but eclectic list of species, including certain green algae. Here, to gain insight in the evolution of organelle nucleotide landscape, we present the GC-rich mitochondrial and plastid DNAs from the trebouxiophyte green alga Coccomyxa sp. C-169. We compare these sequences with other GC-rich organelle DNAs and argue that the forces biasing them towards G and C are nonadaptive and linked to the metabolic and/or life history features of this species. The Coccomyxa organelle genomes are also used for phylogenetic analyses, which highlight the complexities in trying to resolve the interrelationships among the core chlorophyte green algae, but ultimately favour a sister relationship between the Ulvophyceae and Chlorophyceae, with the Trebouxiophyceae branching at the base of the chlorophyte crown.