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Ammonia-oxidizing archaea in forest soil

ABSTRACT: Ammonia-oxidizing archaea in forest soil

PROVIDER: PRJEB45739 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR6066360.fastq.gz	Fastqsanger.gz
	ERR6066370.fastq.gz	Fastqsanger.gz
	ERR6066380.fastq.gz	Fastqsanger.gz
	ERR6066390.fastq.gz	Fastqsanger.gz
	ERR6066400.fastq.gz	Fastqsanger.gz

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A chromatin-driven mechanism of transcription in ammonia-oxidizing archaea under environmental stress [RNA-seq]

Project description:Ammonia-oxidizing archaea (AOA) play a significant role in global nitrogen and carbon cycling. AOA can survive under fluctuating environmental conditions by modulating gene expression. Little is known about how AOA regulate gene expression to adapt environmental stress. Here, we report a chromatin-driven mechanism of transcription in Nitrososphaera Viennensis (EN76) to adapt to temperature stress. Using computational and biochemical assays, we found EN76 contains an archaeasome structure. We found that several residues, including G20, K57, and T58 of histone, are important to form archaea chromatin structures. In vitro transcription assays revealed that AOA chromatin efficiently controls gene expression, similar to eukaryote chromatin. Furthermore, we identified AOA histone acetylation, which activates gene expression. Moreover, by integrating chromatin-based gene expression analyses, we revealed that AOA differentially regulate gene expression in response to temperature stress by altering archaeasome occupancy. Our study provides unprecedented documentation that AOA fine-tunes gene expression through a chromatin-driven epigenetic mechanism.

2024-06-30 | GSE249032 | GEO

A chromatin-driven mechanism of transcription in ammonia-oxidizing archaea under environmental stress [MNase-seq]

2024-06-30 | GSE249031 | GEO

Ammonia oxidizing archaea in Costa Rica Dome OMZ

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Acidification alters the composition of ammonia oxidizing microbial assemblages in marine mesocosms

Project description:Increasing atmospheric CO2 concentrations are causing decreased pH over vast expanses of the ocean. This decreasing pH may alter biogeochemical cycling of carbon and nitrogen via the microbial process of nitrification, a key process that couples these cycles in the ocean, but which is often sensitive to acidic conditions. Recent reports indicate a decrease in oceanic nitrification rates under experimentally lowered pH. How composition and abundance of ammonia oxidizing bacteria (AOB) and archaea (AOA) assemblages respond to decreasing oceanic pH, however, is unknown. We sampled microbes from two different acidification experiments and used a combination of qPCR and functional gene microarrays for the ammonia monooxygenase gene (amoA) to assess how acidification alters the structure of ammonia oxidizer assemblages. We show that despite widely different experimental conditions, acidification consistently altered the community composition of AOB by increasing the relative abundance of taxa related to the Nitrosomonas ureae clade. In one experiment this increase was sufficient to cause an increase in the overall abundance of AOB. There were no systematic shifts in the community structure or abundance of AOA in either experiment. These different responses to acidification underscore the important role of microbial community structure in the resiliency of marine ecosystems. SUBMITTER_CITATION: Title: Acidification alters the composition of ammonia oxidizing microbial assemblages in marine mesocosms Journal: Marine Ecology Progress Series Issue: 492 Pages: 1-8 DOI: 10.3354/meps 10526 Authors: Jennifer L Bowen Patrick J Kearns Michael Holcomb Bess B Ward

2013-08-27 | GSE49956 | GEO

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