Red and Green Algal Monophyly and Extensive Gene Sharing Found in a Rich Repertoire of Red Algal Genes
Red and Green Algal Monophyly and Extensive Gene Sharing Found in a Rich Repertoire of Red Algal Genes
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DOI：
10.1016/j.cub.2011.01.037
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发表时间：
2011-02-22
期刊：
影响因子：
9.2
通讯作者：
Bhattacharya, Debashish
中科院分区：
文献类型：
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作者：
Chan, Cheong Xin;Yang, Eun Chan;Bhattacharya, Debashish
包括红色、绿色（包括陆地植物）和蓝绿藻的植物被假定具有单一的共同祖先，其是光合真核生物的创始谱系[1，2]。然而，最近的多蛋白质同源性提供了很少[3，4]或没有[5，6]支持这一假设。这可能反映了红藻可用的有限的完整基因组数据，目前只有Cyanidioschyzon merolae的高度简化的基因组[7]，网状基因祖先[5]，或误导系统发育推断的可变基因趋异率[8]。在这里，使用新的基因组数据从嗜温紫球藻和Calliarthron tuberculosum，我们分析了60，000个新的红藻基因，以测试红+绿色（RG）藻类的单系性及其与其他谱系的基因共享程度。使用一个基因的基因的方法，我们发现一个新兴的信号RG单系（支持类似的50%的检查蛋白质同源性），增加了不同的门和终端类群的分析。共有1，808个基因组显示了植物和其他谱系之间基因共享的证据。我们证明，一个丰富的嗜温红藻基因库是至关重要的测试真核生物进化中有争议的问题，并了解在原生生物基因遗传的复杂模式。
The Plantae comprising red, green (including land plants), and glaucophyte algae are postulated to have a single common ancestor that is the founding lineage of photosynthetic eukaryotes [1, 2]. However, recent multiprotein phylogenies provide little [3, 4] or no [5, 6] support for this hypothesis. This may reflect limited complete genome data available for red algae, currently only the highly reduced genome of Cyanidioschyzon merolae [7], a reticulate gene ancestry [5], or variable gene divergence rates that mislead phylogenetic inference [8]. Here, using novel genome data from the mesophilic Porphyridium cruentum and Calliarthron tuberculosum, we analyze 60,000 novel red algal genes to test the monophyly of red + green (RG) algae and their extent of gene sharing with other lineages. Using a gene-by-gene approach, we find an emerging signal of RG monophyly (supported by similar to 50% of the examined protein phylogenies) that increases with the number of distinct phyla and terminal taxa in the analysis. A total of 1,808 phylogenies show evidence of gene sharing between Plantae and other lineages. We demonstrate that a rich mesophilic red algal gene repertoire is crucial for testing controversial issues in eukaryote evolution and for understanding the complex patterns of gene inheritance in protists.