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Project description:Ammonia-oxidizing archaea (AOA) are among the most abundant microorganisms and key players in the global nitrogen and carbon cycles. They share a common energy metabolism but represent a heterogeneous group with respect to their environmental distri- bution and adaptions, growth requirements, and genome contents. We report here the genome and proteome of Nitrososphaera viennensis EN76, the type species of the archaeal class Nitrososphaeria of the phylum Thaumarchaeota encompassing all known AOA. N. viennensis is a soil organism with a 2.52-Mb genome and 3,123 predicted protein-coding genes. Proteomic analysis revealed that nearly 50% of the predicted genes were translated under standard laboratory growth conditions. Comparison with genomes of closely related species of the predominantly terrestrial Nitrososphaerales as well as the more streamlined marine Nitrosopumilales (Candidatus order) and the acidophile Nitrosotalea devanaterra revealed a core genome of AOA comprising 860 genes, which allowed for the reconstruction of central metabolic pathways common to all known AOA and expressed in the N. viennensis and Nitrosopelagicus brevis proteomes. Concomitantly, we were able to identify candidate proteins for as yet unidentified crucial steps in central metabolisms. In addition to unraveling aspects of core AOA metabolism, we identified specific metabolic innovations associated with the Nitrososphaerales mediating growth and survival in the soil milieu, including the capacity for biofilm formation, cell surface modifications and cell adhesion, and carbohydrate conversions as well as detoxification of aromatic compounds and drugs.
2017-05-03 | PXD005297 | Pride
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 | GSE249031 | GEO
Project description:Ammonia-oxidizing archaea (AOA) have been reported at high abundance in much of the global ocean, even in environments such as pelagic oxygen minimum zones (OMZs), where conditions seem unlikely to support aerobic ammonium oxidation. Due to the lack of information on any potential alternative metabolism of AOA, the AOA community composition might be expected to differ between oxic and anoxic environments, indicating some difference in ecology and/or physiology of the AOA assemblage. This hypothesis was tested by evaluating AOA community composition using a functional gene microarray that targets the ammonia monooxygenase gene subunit A (amoA). The relationship between environmental parameters and the biogeography of the Arabian Sea and the Eastern Tropical South Pacific (ETSP) AOA assemblages was investigated using principal component analysis (PCA) and redundancy analysis (RDA). In both the Arabian Sea and the ETSP, AOA communities within the core of the OMZ were not significantly different from those inhabiting the oxygenated surface waters above the OMZ. The AOA communities in the Arabian Sea were significantly different from those in the ETSP. In both oceans, the abundance of archaeal amoA gene in the core of the OMZ was higher than that in the surface waters. Our results indicate that AOA communities are distinguished by their geographic origin. RDA suggested that temperature was the main factor that correlated with the differences between the AOA communities from the Arabian Sea and those from the ETSP. Physicochemical properties that characterized the different environments of the OMZ and surface waters played a less important role than did geography in shaping the AOA community composition.
2013-06-20 | GSE46851 | GEO
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
Project description:Ammonia-oxidizing archaea (AOA) have been reported at high abundance in much of the global ocean, even in environments such as pelagic oxygen minimum zones (OMZs), where conditions seem unlikely to support aerobic ammonium oxidation. Due to the lack of information on any potential alternative metabolism of AOA, the AOA community composition might be expected to differ between oxic and anoxic environments, indicating some difference in ecology and/or physiology of the AOA assemblage. This hypothesis was tested by evaluating AOA community composition using a functional gene microarray that targets the ammonia monooxygenase gene subunit A (amoA). The relationship between environmental parameters and the biogeography of the Arabian Sea and the Eastern Tropical South Pacific (ETSP) AOA assemblages was investigated using principal component analysis (PCA) and redundancy analysis (RDA). In both the Arabian Sea and the ETSP, AOA communities within the core of the OMZ were not significantly different from those inhabiting the oxygenated surface waters above the OMZ. The AOA communities in the Arabian Sea were significantly different from those in the ETSP. In both oceans, the abundance of archaeal amoA gene in the core of the OMZ was higher than that in the surface waters. Our results indicate that AOA communities are distinguished by their geographic origin. RDA suggested that temperature was the main factor that correlated with the differences between the AOA communities from the Arabian Sea and those from the ETSP. Physicochemical properties that characterized the different environments of the OMZ and surface waters played a less important role than did geography in shaping the AOA community composition. Two-color array (Cy3 and Cy5): the universal standard 20-mer oligo is printed to the slide with a 70-mer oligo (an archetype). Environmental DNA sequences (fluoresced with Cy3) within 15% of the 70-mer conjugated to a 20-mer oligo (fluoresced with Cy5) complementary to the universal standard will bind to the oligo probes on the array. Signal is the ratio of Cy3 to Cy5. Three replicate probes were printed for each archetype. Two replicate arrays were run on duplicate targets.
2013-06-20 | E-GEOD-46851 | biostudies-arrayexpress
Project description:Intracytoplasmic sperm injection (ICSI) has been an effective infertility treatment. Nevertheless, ICSI failures still occurred. One of the factors associated with ICSI failure is oocyte activation deficiency (AOD). The most commonly applied method of artificial oocyte activation (AOA) in humans includes ionophore. Although AOA is performed as a routine process in many assisted reproduction centers, up to date, there is no relevant study to expound whether AOA procedures increase developmental risks by disturbing subsequent gene expression during the embryonic development stages. Our results for the first time provide a profile of the changes in the global patterns of gene expression in AOA treatment versus ICSI generated mouse early embryos. In particular, we focus on the expression changes of imprinted genes. Another key observation in this study is that AOA treatment affects imprinted gene Igf2r expression and mehtylation, which is regulated by the imprinted Airn macro long non-coding (lnc) RNA.
2021-11-10 | GSE155948 | GEO