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ABSTRACT: Bio-electron behavior simulated by Cr(VI) in an electron donor limited denitrification system

PROVIDER: PRJNA869435 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR21043141_1.fastq.gz	Fastqsanger.gz
	SRR21043141_2.fastq.gz	Fastqsanger.gz
	SRR21043142_1.fastq.gz	Fastqsanger.gz
	SRR21043142_2.fastq.gz	Fastqsanger.gz
	SRR21043143_1.fastq.gz	Fastqsanger.gz

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Transcriptome analysis of Paracoccus denitrificans following exposure to hexavalent chromium under aerobic and anoxic conditions

Project description:Suspended cell studies were performed to document whole-genome transcriptional profiles as a function of Cr(VI) reduction under different electron accepting conditions. Cell suspension studies were performed in 250 mL serum bottles for two conditions: 1) under anoxic condition with lactate as carbon source and nitrate as electron acceptor, and 2) under aerobic condition with lactate as carbon source and oxygen as electron acceptor. The initial Cr(VI) and nitrate concentrations were 1000 μg/L and 40 mg N/L, respectively. Samples from both the conditions were collected after 5 hours and the cell pellet was saved at -80°C.

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Environmental Pollutant Induced Epigenetic Predisposition to Developmental Defects and Cancer Phenotypes in the Progeny

Project description:Hexavalent Chromium, Cr(VI), exposure is known to cause cancer and is a significant human health concern. While the effect of Cr(VI) exposure on exposed individuals is well studied, long-term effects of the same on the progeny of exposed individual are not known. In this study, using Drosophila model system, we show that Cr(VI) exposure of mothers leads to phenotypic variations in the progeny who have never been exposed to Cr(VI). These phenotypic variations arise due to epigenetic instability in the somatic tissues of the progeny rather than novel genetic mutations. Using a Drosophila cancer model system, we also show that maternal Cr(VI) exposure can lead to cancer phenotypes in the progeny and the propensity to cause cancer phenotypes in the progeny is fixed in the population for at least three generations. Thus, we show for the first time that effects of Cr(VI) exposure can last for several generations. This study also lays the foundation to use Drosophila model system to provide novel insights into Cr(VI) and other heavy metal toxicity.

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Project description:Enhancement of bio-promoters on Cr(VI) inhibited sulfur-driven denitrification: repairing damage, accelerating electron transfer, and reshaping microbial collaboration

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Expression analysis in anaerobic Hanford 100H aquifer flow-through columns receiving lactate and chromate

Project description:Columns containing Hanford 100H aquifer sediment continuously infused with 5 mM lactate, 5 uM Cr(VI), and either 7.5 mM sulfate or 12 mM nitrate as an electron acceptor.

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Expression analysis in anaerobic Hanford 100H aquifer flow-through columns receiving lactate and chromate

Project description:Columns containing Hanford 100H aquifer sediment continuously infused with 5 mM lactate, 5 uM Cr(VI), and either 7.5 mM sulfate or 12 mM nitrate as an electron acceptor. A two-chip study using total RNA extracted from unfiltered effluent from columns (nitrate or sulfate infused).

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Global transcriptional analysis of Cr(VI)-adapted cells of Klebsiella sp. AqSCr

Project description:Hexavalent chromium (Cr(VI)) is a highly toxic contaminant, some bacteria are able to transform it to less toxic and less soluble trivalent chromium (Cr(III)). Klebsiella sp. strain AqSCr, isolated from Cr(VI)-polluted groundwater, reduces Cr(VI) both aerobically and anaerobically, and resists up 35 mM of Cr(VI); Subculturing of AqSCr in the presence of Cr(VI) conduces to adaptation. In this study, we performed RNA-Seq of Cr(VI) adapted stage, finding 255 genes upregulated and 240 downregulated with respect to controls without Cr(VI). Genes differentially expressed are mostly associated with oxidative stress response, DNA repair and replication, sulfur starvation response, envelope-osmotic stress response, fatty acid metabolism, ribosomal subunits and energy metabolism. Among them, genes not previously associated with chromium resistance as cybB, encoding a putative superoxide oxidase, gltA2, encoding an alternative citrate synthase, and des, encoding a fatty acid desaturase were upregulated. The alternative sigma factors fecl, rpoE and rpoS were upredgulated in Cr(VI) adapted cells, then they participate in orchestate the Cr(VI)-resistance mechanisms in AqSCr strain

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