The GC-rich mitochondrial and plastid genomes of the green alga Coccomyxa give insight into the evolution of organelle DNA nucleotide landscape.

The GC-rich mitochondrial and plastid genomes of the green alga Coccomyxa give insight into the evolution of organelle DNA nucleotide landscape.
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DOI:
10.1371/journal.pone.0023624
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Keeling PJ
Keeling PJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Smith DR;Burki F;Yamada T;Grimwood J;Grigoriev IV;Van Etten JL;Keeling PJ

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大多数可用的线粒体和质体基因组序列倾向于腺嘌呤和胸腺嘧啶(AT)而不是鸟嘌呤和胞嘧啶(GC)。富含gc的细胞器dna的例子仅限于一小部分物种,包括某些绿藻。在这里,为了深入了解细胞器核苷酸景观的进化,我们展示了来自海藻绿藻Coccomyxa sp. C-169的富含gc的线粒体和质体dna。我们将这些序列与其他富含gc的细胞器dna进行比较,认为使它们倾向于G和C的力量是非适应性的,并且与该物种的代谢和/或生活史特征有关。Coccomyxa细胞器基因组也被用于系统发育分析,这突出了试图解决核心绿藻之间相互关系的复杂性,但最终倾向于绿藻类和绿藻类之间的姐妹关系,绿藻类分支在绿藻冠的基部。
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.
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