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ABSTRACT: effects of nitrification inhibitors of CP and DCD on methanogens

PROVIDER: PRJEB13287 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR1347774.fastq.gz	Fastqsanger.gz
	ERR1347775.fastq.gz	Fastqsanger.gz
	ERR1347776.fastq.gz	Fastqsanger.gz
	ERR1347777.fastq.gz	Fastqsanger.gz
	ERR1347778.fastq.gz	Fastqsanger.gz

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Project description:Nitrification inhibitors

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Control of the E. coli SOS regulon expression by intracellular dNTP pool changes

Project description:We studied SOS mutator effect mediated by recA730 and changes in the dNTP pool. We found that established dNTP pool changes resulting from deficiencies in the ndk or dcd genes, had a strongly suppressive effect on the recA730 mutator effect. To investigate whether the observed reduction in SOS mutator effect is due to lowered expression of the entire SOS regulon, we performed microarray analysis of gene expression profiles in each of the single ndk, dcd, and recA730 strains, as well as the double recA730 ndk and recA730 dcd strains. Comparison of transcriptomes of the bacterium Escherichia coli six strains: wt, dcd, ndk, recA730, recA730 dcd and recA730 ndk. All strains were derivatives of the MC4100 strain, carrying a sulA366 allele (?(argF-lac)169 sulA366). dcd and ndk alleles used were dcd::kan and ndk::cam, respectively. Strains were compared in pairs: wt vs dcd, wt vs ndk, wt vs recA730, recA730 vs recA730 dcd and recA730 vs recA730 ndk. Two or three biological replicates for each strain were used. Each biological replicate had two technical replicates with dye swapping.

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Project description:Lung donation after cardiac death (DCD), in contrast to donation after brain death (DBD), is a promising and increasingly common method to help relieve the shortage of donor organs. However, the pathogenetic consequences of retrieved lungs after DCD vs. DBD have not been clarified. We aimed to study the differential gene expression profiles in lungs of DCD and DBD patients. DCD patients were matched with DBD lung transplant cases from a prospectively maintained database. The number of tissue samples included in this study was 6 pre- and 5 post-transplant in DCD and 12 pre- and 12 post-transplant in DBD for a total number of 35 lung tissue samples.

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Project description:Effect of nitrification inhibitors on ammonia oxidizers

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down-regulation of dermcidin by shRNA in breast cancer cell line MDA-MB-361

Project description:DCD is a gene amplified and overexpressed in a subset of breast tumors acting as a growth and survival factor. Patients with DCD-positive breast cancer have worse prognostic features. To investigate the role of DCD in breast tumorigenesis, we analyzed the consequences of its downregulation in human breast cancer cell lines using three specific shRNA lentivirus vectors. Genes up- and down-regulated by DCD were identified using Affymetrix microarray and analyzed by MetaCore Platform. We found that loss of DCD expression led to reduced cell proliferation, resistance to apoptosis, and suppressed tumorigenesis in immunodeficient mice. Network analysis of gene expression data revealed perturbed ERBB signaling following DCD shRNA expression including changes in the expression of ERBB receptors and their ligands. These findings imply that DCD promotes breast tumorigenesis via modulating the activity of the ERBB signaling pathways. As ERBB signaling is also important for neural survival, HER2+ breast tumors may highjack DCD’s neural survival-promoting functions to promote tumorigenesis.

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Hypothermic oxygenated machine perfusion promotes mitophagy flux against hypoxia ischemic injury in donation after circulatory death liver

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Project description:The ecophysiology of complete ammonia oxidizing Nitrospira (CMX) and their widespread occurrence in groundwater suggests that CMX bacteria have a competitive advantage over ammonia-oxidizing bacteria (AOB) and archaea (AOA) in these environments. However, the relevance of their activity from the ecosystem-level process perspective has remained unclear. We investigated oligotrophic carbonate rock aquifers as a model system to assess the contribution of CMX, AOA and AOB to nitrification and to identify the environmental drivers of their niche differentiation at different levels of ammonium and oxygen. CMX accounted for up to 95% of the ammonia oxidizer communities. Nitrification rates were positively correlated to CMX clade A-associated phylotypes and AOB affiliated with Nitrosomonas ureae. Surprisingly, short-term incubations amended with the nitrification inhibitors allylthiourea and chlorate suggested that AOB contributed more than 90% to overall ammonia oxidation, while metaproteomics analysis confirmed an active role of CMX in both ammonia and nitrite oxidation. Ecophysiological niche differentiation of CMX clades A and B, AOA and AOB was linked to their requirements for ammonium, oxygen tolerance, and metabolic versatility. Our results demonstrate that despite numerical predominance of CMX, the first step of nitrification in oligotrophic groundwater is primarily governed by AOB. Higher growth yields at lower NH4+ turnover rates and energy derived from nitrite oxidation most likely enable CMX to maintain consistently high populations. Activity measurements combined with differential inhibition allowed a refined understanding of ammonia oxidizer coexistence, competition and cooperation beyond the insights from molecular data alone.

2023-10-24 | PXD039573 | Pride

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