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Marine Dadabacteria exhibit genome streamlining and phototrophy-driven niche partitioning
The ISME Journal ( IF 11.0 ) Pub Date : 2020-11-23 , DOI: 10.1038/s41396-020-00834-5
Elaina D Graham 1 , Benjamin J Tully 1, 2
Affiliation  

The remineralization of organic material via heterotrophy in the marine environment is performed by a diverse and varied group of microorganisms that can specialize in the type of organic material degraded and the niche they occupy. The marine Dadabacteria are cosmopolitan in the marine environment and belong to a candidate phylum for which there has not been a comprehensive assessment of the available genomic data to date. Here in, we assess the functional potential of the marine pelagic Dadabacteria in comparison to members of the phylum that originate from terrestrial, hydrothermal, and subsurface environments. Our analysis reveals that the marine pelagic Dadabacteria have streamlined genomes, corresponding to smaller genome sizes and lower nitrogen content of their DNA and predicted proteome, relative to their phylogenetic counterparts. Collectively, the Dadabacteria have the potential to degrade microbial dissolved organic matter, specifically peptidoglycan and phospholipids. The marine Dadabacteria belong to two clades with apparent distinct ecological niches in global metagenomic data: a clade with the potential for photoheterotrophy through the use of proteorhodopsin, present predominantly in surface waters up to 100 m depth; and a clade lacking the potential for photoheterotrophy that is more abundant in the deep photic zone.



中文翻译:

海洋达达细菌表现出基因组精简和光养驱动的生态位划分

海洋环境中有机物质通过异养作用的再矿化是由多种多样的微生物群进行的,这些微生物可以专门研究降解的有机物质的类型及其占据的生态位。海洋达达细菌广泛存在于海洋环境中,属于候选门,迄今为止尚未对可用的基因组数据进行全面评估。在这里,我们评估了海洋中上层达达细菌与源自陆地、热液和地下环境的细菌门成员的功能潜力。我们的分析表明,海洋中上层达达细菌相对于其系统发育对应物具有精简的基因组,对应于较小的基因组大小以及较低的 DNA 氮含量和预测的蛋白质组。总的来说,达达细菌具有降解微生物溶解的有机物的潜力,特别是肽聚糖和磷脂。在全球宏基因组数据中,海洋Dadabacteria属于两个具有明显不同生态位的进化枝:一个进化枝具有通过使用原视紫红质实现光异养潜力的进化枝,主要存在于深度达 100 m 的表层水中;以及缺乏光异养潜力的进化枝,其在深光区更为丰富。

更新日期:2020-11-23
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