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首页> 外文期刊>Genes & Genetic Systems >Molecular phylogeny and evolution of the plastid and nuclear encoded cbbX genes in the unicellular red alga Cyanidioschyzon merolae.
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Molecular phylogeny and evolution of the plastid and nuclear encoded cbbX genes in the unicellular red alga Cyanidioschyzon merolae.

机译：单细胞红藻Cyanidioschyzon merolae中质体和核编码cbbX基因的分子系统发育和进化。

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摘要

The cbbX gene is generally encoded in proteobacterial genomes and red-algal plastid genomes. In this study, we found two distinct cbbX genes of Cyanidioschyzon merolae, a unicellular red alga, one encoded in the plastid genome and the other encoded in the cell nucleus. The phylogenetic tree inferred from cbbX genes and strongly conserved gene organization (rbcLS-cbbX) suggests that the plastid-encoded cbbX gene of C. merolae came from an ancestral proteobacterium by horizontal gene transfer. On the other hand, the nuclear-encoded cbbX gene of C. merolae was classified in another cluster together with the nucleomorph-encoded cbbX gene of Guillardia theta. Furthermore, expression of the two cbbX genes were regulated differently in response to extracellular CO(2) concentration. Our results imply that cbbX gene in the plastid genome was copied and transferred to the cell nucleus after horizontal gene transfer of RuBisCo operon from ancestral beta-proteobacteria at comparatively early stage, and that each cbbX evolved in different ways.
机译：cbbX基因通常在蛋白细菌基因组和红藻质体基因组中编码。在这项研究中，我们发现了Cyanidioschyzon merolae的两个不同的cbbX基因，一个单细胞红藻，一个在质体基因组中编码，另一个在细胞核中编码。从cbbX基因和高度保守的基因组织（rbcLS-cbbX）推断的系统发育树表明，通过水平基因转移，merolae merolae的质体编码cbbX基因来自祖传变形杆菌。另一方面，C。merolae的核编码cbbX基因与Guillardia theta的核型编码cbbX基因一起被分类在另一个簇中。此外，两个cbbX基因的表达被调节到响应细胞外CO（2）浓度不同。我们的结果表明，质体基因组中的cbbX基因在相对较早的阶段就从祖先β变形杆菌中被RuBisCo操纵子水平基因转移后，被复制并转移到细胞核中，并且每个cbbX以不同的方式进化。

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