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ABSTRACT: Viruses assisted bacteria to facilitate soil multifunctionality under organochlorine pesticide contamination

PROVIDER: PRJNA1032725 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26541656_1.fastq.gz	Fastqsanger.gz
	SRR26541656_2.fastq.gz	Fastqsanger.gz
	SRR26541657_1.fastq.gz	Fastqsanger.gz
	SRR26541657_2.fastq.gz	Fastqsanger.gz
	SRR26541658_1.fastq.gz	Fastqsanger.gz

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Effects of Combined Persistant Organic Pollutants on Global Gene Expression in Human HepaRG Cells

Project description:The exposure to and contamination by Persistent Organic Pollutants (POPs), which include pesticides used worldwide and polyaromatic hydrocarbons, is detrimental to human health and diverse ecosystems. Although most mechanistic studies have focused on single compounds, living organisms are exposed to multiple environmental xenobiotics, simultaneously, throughout their lives. The experimental evidence useful for assessing the effects of exposure to pollutant mixtures is scarce. We investigated the effects of exposure to a combination of two POPs, which employ different xenosensors, on global gene expression in a human hepatocyte cell model, HepaRG. Whole genome microarrays were used to investigate the effects on the HepaRG transcriptome following exposure to the combination of POPs as compared to each compound individually. Differentiated HepaRG cells were treated with either 2,3,7,8 tetrachlorodibenzo-p-dioxin, alpha-endosulfan (an organochlorine pesticide), the mixture or the DMSO vehicle for 30 hours after which RNA was extracted for hybridization on Affymetrix whole human genome microarrays.

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Project description:Biotransformation of soil organochlorine pesticides (OCP) is often impeded by a lack of nutrients relevant for bacterial growth and/or co-metabolic OCP biotransformation. By providing space-filling mycelia, fungi promote contaminant biodegradation by facilitating bacterial dispersal and the mobilization and release of nutrients in the mycosphere. We here tested whether mycelial nutrient transfer from nutrient-rich to nutrient-deprived areas facilitates bacterial OCP degradation in a nutrient-deficient habitat. The legacy pesticide hexachlorocyclohexane (HCH), a non-HCH-degrading fungus (Fusarium equiseti K3), and a co-metabolically HCH-degrading bacterium (Sphingobium sp. S8) isolated from the same HCH-contaminated soil were used in spatially structured model ecosystems. Using 13C-labelled fungal biomass and protein-based stable isotope probing (protein-SIP), we traced the incorporation of 13C fungal metabolites into bacterial proteins while simultaneously determining the biotransformation of the HCH isomers. The relative isotope abundance (RIA, 7.1 – 14.2%), labeling ratio (LR, 0.13 – 0.35), and the shape of isotopic mass distribution profiles of bacterial peptides indicated the transfer of 13C-labeled fungal metabolites into bacterial proteins. Distinct 13C incorporation into the haloalkane dehalogenase (linB) and 2,5-dichloro-2,5-cyclohexadiene-1,4-diol dehydrogenase (LinC), as key enzymes in metabolic HCH degradation, underpin the role of mycelial nutrient transport and fungal-bacterial interactions for co-metabolic bacterial HCH degradation in heterogeneous habitats. Nutrient uptake from mycelia increased HCH removal by twofold as compared to bacterial monocultures. Fungal-bacterial interactions hence may play an important role in the co-metabolic biotransformation of OCP or recalcitrant micropollutants (MPs).

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