Seasonal Gene Expression and the Ecophysiological Implications of Toxic Microcystis aeruginosa Blooms in Lake Taihu

Tang Xiangming; Krausfeldt Lauren E.; Shao Keqiang; LeCleir Gary R.; Stough Joshua M. A.; Gao Guang; Boyer Gregory L.; Zhang Yunlin; Paerl Hans W.; Qin Boqiang; Wilhelm Steven W.

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Seasonal Gene Expression and the Ecophysiological Implications of Toxic Microcystis aeruginosa Blooms in Lake Taihu

机译：太湖有毒铜绿微囊藻水华的季节性基因表达及其生态生理意义

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Harmful cyanobacterial blooms represent an increasing threat to freshwater resources globally. Despite increased research, the physiological basis of how the dominant bloom-forming cyanobacteria, Microcystis spp., proliferate and then maintain high population densities through changing environmental conditions is poorly understood. In this study, we examined the transcriptional profiles of the microbial community in Lake Taihu, China at 9 stations sampled monthly from June to October in 2014. To target Microcystis populations, we collected metatranscriptomic data and mapped reads to the M. aeruginosa NIES 843 genome. Our results revealed significant temporal gene expression patterns, with many genes separating into either early or late bloom clusters. About one-third of genes observed from M. aeruginosa were differentially expressed between these two clusters. Conductivity and nutrient availability appeared to be the environmental factors most strongly associated with these temporal gene expression shifts. Compared with the early bloom season (June and July), genes involved in N and P transport, energy metabolism, translation, and amino acid biosynthesis were down-regulated during the later season (August to October). In parallel, genes involved in regulatory functions as well as transposases and the production of microcystin and extracellular polysaccharides were up-regulated in the later season. Our observation indicates an eco-physiological shift occurs within the Microcystis spp. transcriptome as cells move from the rapid growth of early summer to bloom maintenance in late summer and autumn.

机译：有害的蓝细菌开花代表着全球对淡水资源的日益威胁。尽管进行了更多的研究，但对于形成显性花粉的蓝藻微囊藻如何扩散，然后通过变化的环境条件保持高种群密度的生理基础知之甚少。在这项研究中，我们检查了中国太湖微生物群落的转录谱，2014年6月至10月每月采样9个站。针对微囊藻种群，我们收集了元转录组学数据，并将其读数映射到绿脓杆菌NIES 843基因组。我们的研究结果揭示了重要的时间基因表达模式，其中许多基因分为早期或晚期绽放簇。从铜绿假单胞菌观察到的基因中约有三分之一在这两个簇之间差异表达。电导率和养分利用率似乎是与这些瞬时基因表达变化最密切相关的环境因素。与花开初期（6月和7月）相比，氮和磷转运，能量代谢，翻译和氨基酸生物合成相关的基因在下一个季节（8月至10月）被下调。同时，参与调节功能的基因以及转座酶以及微囊藻毒素和细胞外多糖的产生在随后的季节被上调。我们的观察表明微囊藻属内发生了生态生理转变。转录组随着细胞从初夏的快速生长转移到夏末和秋季的花期维持。

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来源
《Environmental Science & Technology》 |2018年第19期|11049-11059|共11页
作者
Tang Xiangming; Krausfeldt Lauren E.; Shao Keqiang; LeCleir Gary R.; Stough Joshua M. A.; Gao Guang; Boyer Gregory L.; Zhang Yunlin; Paerl Hans W.; Qin Boqiang; Wilhelm Steven W.;
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作者单位

Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA;

Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA;

Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA;

Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

SUNY Coll Environm Sci & Forestry, Dept Chem, Syracuse, NY 13210 USA;

Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

Univ North Carolina Chapel Hill, Inst Marine Sci, Morehead City, NC 28557 USA;

Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lab Lake Ecosyst Res, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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1. Whole-Genome Sequence of Microcystis aeruginosa TAIHU98, a Nontoxic Bloom-Forming Strain Isolated from Taihu Lake, China [J] . Chen Yang, Wei Zhang, Minglei Ren, Genome Announcements . 2013,第3期

机译：太湖无毒布鲁姆菌铜绿微囊藻TAIHU98的全基因组序列
2. Phylogenetic Inference of Colony Isolates Comprising Seasonal Microcystis Blooms in Lake Taihu, China [J] . Timothy G. Otten, Hans W. Paerl Microbial Ecology . 2011,第4期

机译：太湖地区季节性微囊藻水华的菌落分离物的系统发生推论
3. Phylogenetic Inference of Colony Isolates Comprising Seasonal Microcystis Blooms in Lake Taihu, China [J] . Otten Timothy G., Paerl Hans W. . Microbial Ecology: An International Journal . 2011,第4期

机译：太湖地区季节性微囊藻水华的菌落分离物的系统发生推论
4. Metablic coupling between Nitzschia sp. and Microcystis aeruginosa in terms of phosphorus utilization during the Microcystis bloom in freshwater lakes [C] . Zhou Yiyong, Cao Xiuyun, Song Chunlei International Symposium on Microcystis Studies from Asia. . 2011

机译：Nitzschia sp。之间的代谢耦合。淡水湖泊微囊藻开花过程中磷的利用
5. Exploring gene expression patterns to understand the nutritional ecology of the toxic cyanobacterium Microcystis aeruginosa. [D] . Harke, Matthew John. 2015

机译：探索基因表达模式，以了解有毒蓝藻微囊藻的营养生态。
6. Whole-Genome Sequence of Microcystis aeruginosa TAIHU98 a Nontoxic Bloom-Forming Strain Isolated from Taihu Lake China [O] . Chen Yang, Wei Zhang, Minglei Ren, 2013

机译：太湖无毒开花菌株铜绿微囊藻TAIHU98的全基因组序列
7. Whole-Genome Sequence of Microcystis aeruginosa TAIHU98, a Nontoxic Bloom-Forming Strain Isolated from Taihu Lake, China [O] . Chen Yang, Wei Zhang, Minglei Ren, 2013

机译：微囊型铜绿假单胞菌序列的全基因组序列，来自中国太湖湖中孤立的无毒绽放成型菌株

Seasonal Gene Expression and the Ecophysiological Implications of Toxic Microcystis aeruginosa Blooms in Lake Taihu

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