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ABSTRACT: Diversity of arsM gene in arsenic-contaminated soils

PROVIDER: PRJNA716505 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14069154.fastq.gz	Fastqsanger.gz
	SRR14069154_1.fastq.gz	Fastqsanger.gz
	SRR14069154_2.fastq.gz	Fastqsanger.gz
	SRR14069155.fastq.gz	Fastqsanger.gz
	SRR14069155_1.fastq.gz	Fastqsanger.gz

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Project description:The wild grass Holcus lanatus L., an outcrossing diploid (2n=14) and closely related to B. distachyon (Aliscioni et al., 2012), has a remarkable balanced polymorphism in arsenate tolerance, screened from a semi-natural, non-arsenic contaminated populations (Meharg et al., 1993), coded by a single gene (Macnair et al., 1992). As arsenate is a phosphate analogue it has been postulated that this polymorphism is maintained due to phosphorus nutrition, not arsenate tolerance per se, particularly as the tolerance gene co-segregates with suppression of High affinity Phosphate Transport (HAPT) (Meharg et al., 1992a; Meharg & Macnair, 1992b), though an explicit ecological link to phosphorus status of soils has yet to be proven (Naylor et al., 1996). The aim of this study is to address soil phosphate responsiveness (+/-) along with the transcriptomic consequences of being of arsenic tolerant (T) or non-tolerant (N) phenotype to ascertain why and how this polymorphism is maintained.

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Project description:Arsenic exposure is a global health problem. Millions of people encounter arsenic through contaminated drinking water, consumption, and inhalation. The arsenic response locus in budding yeast is responsible for the detoxification of arsenic and its removal from the cell. This locus constitutes a conserved pathway ranging from prokaryotes to higher eukaryotes. The goal of this study was to identify how the arsenic response locus is regulated in an arsenic dependent manner. An affinity enrichment strategy called CRISPR-Chromatin Affinity Purification with Mass Spectrometry (CRISPR-ChAP-MS) was used that provides for the proteomic characterization of a given locus. CRISPR-ChAP-MS was applied to the arsenic response locus and uncovered 40 nuclear-annotated proteins showing enrichment. Functional assays, identified the histone acetyltransferase activity of SAGA and the ATPase chromatin remodeling activity of SWI/SNF to be required for activation of the locus. Furthermore, SAGA and SWI/SNF were both found to specifically organize the chromatin structure at the arsenic response locus for activation of gene transcription. This study provides the first proteomic characterization of an arsenic response locus and key insight into the mechanism of transcriptional activation that is necessary for detoxification of arsenic from the cell.

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