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Comparative Analysis of the Genomes of Cyanobacteria and Plants

机译：基因菌和植物基因组的比较分析

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Chloroplast genome originates from the genome of ancestral cyanobacterial endosymbiont. The comparison of the genomes of cyanobacteria and plants has been made possible by the advance in genome sequencing. I report here current results of our computational efforts to compare the genomes of cyanobacteria and plants and to trace the process of evolution of cyanobacteria, chloroplasts and plants. Cyanobacteria form a clearly defined monophyletic clade with reasonable level of diversity and are ideal fortesting various approaches of genome comparison. Analysis of short sequence features such as genome signature was found to be useful in characterizing cyanobacterial genomes. Comparison of genome contents was performed by homology grouping of predictedprotein coding sequences, rather than orthologue-based comparison, to minimize effects of multi-domain proteins and large protein families, both of which are important in cyanobacterial genomes. Comparison of the genomes of six species of cyanobacteria suggests that there are a number of species-specific additions of protein genes, and this information is useful in reconstructing phylogenetic relationship. The homology groups in cyanobacteria were used as a reference to compare plants and non-photosynthetic organisms. The results suggest that 238 groups that are common to all organisms analyzed may define a minimal set of gene groups. In addition, only 80 groups are identified as the gene groups that could not have been acquired by plants without cyanobacterial endosymbiosis. Further study is needed to identify plant genes of cyanobacterial origin.
机译：叶绿体基因组起源于祖传肌细胞indosymbiont的基因组。通过基因组测序的提前，已经使蓝杆菌和植物的基因组进行比较。我在这里报告了我们的计算努力的结果，可以比较蓝藻和植物的基因组，并追踪蓝细菌，叶绿体和植物的进化过程。蓝藻形成明确定义的单晶的疏水板，具有合理的多样性水平，是理想的强调各种基因组比较方法。发现短序列特征的分析如基因组签名，可用于表征蓝藻基因组。通过对预测蛋白编码序列的同源分组而不是基于正向性的比较来进行基因组含量的比较，以最大限度地减少多域蛋白和大蛋白质家族的影响，这两者在蓝藻基因组中都很重要。六种蓝藻的基因组的比较表明存在许多特异性的蛋白质基因的添加，并且该信息可用于重建系统发育关系。用Cyanobacteria的同源群作为参考，以比较植物和非光合生物。结果表明，分析的所有生物常见的238个组可以定义最小的基因组。此外，只有80组被鉴定为不能被植物获取的基因组，没有蓝细菌内联的植物。需要进一步研究以鉴定蓝藻源的植物基因。

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