Cyanophora paradoxa Genome Elucidates Origin of Photosynthesis in Algae and Plants
Cyanophora paradoxa Genome Elucidates Origin of Photosynthesis in Algae and Plants
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DOI：
10.1126/science.1213561
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发表时间：
2012-02-17
期刊：
影响因子：
56.9
通讯作者：
Bhattacharya, Debashish
中科院分区：
文献类型：
--
作者：
Price, Dana C.;Chan, Cheong Xin;Bhattacharya, Debashish
10亿多年前真核生物质体的主要内共生起源导致了藻类和植物的进化。我们分析了来自异藻蓝藻（Cyanophora paradoxa）的基因组草图和转录组数据，并为真核生物超群Plantae的初级质体的单一起源提供了证据。C. paradoxa保留了植物和藻类常见的淀粉生物合成、发酵和质体蛋白易位的祖先特征，但缺乏典型的真核光收集复合蛋白。在悖论c和其他植物的基因组中发现了与衣原体等寄生虫的古代联系的痕迹。显然，类似衣原体的细菌捐赠了基因，这些基因允许从质体中输出光合产物，并将其聚合成细胞质中储存的多糖。
The primary endosymbiotic origin of the plastid in eukaryotes more than 1 billion years ago led to the evolution of algae and plants. We analyzed draft genome and transcriptome data from the basally diverging alga Cyanophora paradoxa and provide evidence for a single origin of the primary plastid in the eukaryote supergroup Plantae. C. paradoxa retains ancestral features of starch biosynthesis, fermentation, and plastid protein translocation common to plants and algae but lacks typical eukaryotic light-harvesting complex proteins. Traces of an ancient link to parasites such as Chlamydiae were found in the genomes of C. paradoxa and other Plantae. Apparently, Chlamydia-like bacteria donated genes that allow export of photosynthate from the plastid and its polymerization into storage polysaccharide in the cytosol.