参与循环的新型元基因组组装基因组来自太平洋氧气最小区的循环
Xin Sun1,2,3,4, Bess B Ward5
1Department of Geosciences, Guyot Hall, Princeton University, Princeton, NJ, USA. x.sun@yale.edu.
ISME communications
|November 8, 2023
概括
在氧气最小区 (OMZ) 中的微生物驱动独特的生物地球化学循环. 这项研究揭示了来自东热带南太平洋OMZ的新型脱细菌和古生物,扩大了我们对低氧海洋环境中的微生物生命的理解.
科学领域:
- 海洋微生物学 海洋微生物学
- 生物地质化学生物地质化学
- 基因组学就是基因组学.
背景情况:
- 氧气最小区 (OMZ) 是关键的海洋环境,其特点是的氧化还原梯度,影响微生物群落和生物地化学循环.
- 在OMZ中的微生物生活在全球营养循环中发挥着关键作用,但与氧气充足的海洋地区的微生物相比,人们对其了解较少.
研究的目的:
- 使用元基因组组装基因组 (MAGs) 描述东热带南太平洋OMZ内的微生物群落.
- 在OMZ中识别参与循环的新型微生物参与者,特别是脱.
- 研究微生物适应策略和低氧海洋生态系统中脱的演变.
主要方法:
- 从东热带南太平洋的OMZ中恢复了39个高质量和中质量的元基因组组装基因组 (MAG).
- 对OMZMAG的比较基因组分析与2631个海洋MAG的全球数据集进行比较.
- 对新型细菌和古生物基因组的遗传学和代谢潜力分析.
主要成果:
- 超过一半的恢复OMZMAG代表新物种,显著扩大已知的微生物多样性.
- 脱微生物,特别是那些参与部分脱和损失的微生物,在OMZ中占主导地位.
- 发现了一种具有酸盐降低能力的新型细菌基因组,只能归类为类级.
- 一个海洋II组考古物体表现出多功能脱能力,包括N2O的呼吸.
结论:
- 东部热带南太平洋OMZ拥有独特且基本上没有特征的微生物群落.
- 在这项研究中发现的新型非化细菌和古生物是OMZ循环中的关键参与者.
- 这些发现增强了我们对微生物适应低氧环境和脱化的进化历史的理解.
相关概念视频
01:15Metabolism of Chemolithotrophs
21
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
21
01:28Anoxygenic Phototrophic Bacteria
34
Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
34
01:24Diversity of Archaea II
19
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
19
01:30Bacterial Phylum Cyanobacteria
27
Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
27
01:30Anoxygenic Photosynthesis
24
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
24
01:28Carbon-dioxide Fixation
19
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
19