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ABSTRACT: airborne eDNA sequencing

PROVIDER: PRJNA1277133 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR33990177_1.fastq.gz	Fastqsanger.gz
	SRR33990177_2.fastq.gz	Fastqsanger.gz
	SRR33990178_1.fastq.gz	Fastqsanger.gz
	SRR33990178_2.fastq.gz	Fastqsanger.gz
	SRR33990179_1.fastq.gz	Fastqsanger.gz

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Pseudomonas aeruginosa two-component regulator BfmR controls bacteriophage lysis and DNA release during biofilm development through PhdA

Project description:Biofilms are surface-adhered bacterial communities encased in an extracellular matrix composed of polysaccharides, proteins, and extracelluar (e)DNA, with eDNA being required for the formation and integrity of biofilms. Here we demonstrate that the spatial and temporal release of eDNA is regulated by BfmR, a regulator essential for Pseudomonas aeruginosa biofilm development. The expression of bfmR coincided with localized cell death and DNA release, with high eDNA concentrations localized to the outer part of microcolonies in the form of a ring and as a cap on small clusters. Additionally, eDNA release and cell lysis increased significantly following bfmR inactivation. Genome-wide transcriptional profiling indicated that bfmR was required for repression of genes associated with bacteriophage assembly and bacteriophage-mediated lysis. In order to determine which of these genes were directly regulated by BfmR, we utilized chromatin immunoprecipitation (ChIP) analysis to identify the promoter of PA0691, termed here phdA, encoding a previously undescribed homologue of the prevent-host-death (Phd) family of proteins. Lack of phdA expression coincided with impaired biofilm development, increased cell death and bacteriophage release, a phenotype comparable to ΔbfmR. Expression of phdA in ΔbfmR biofilms restored eDNA release, cell lysis, release of bacteriophages, and biofilm formation to wild type levels. Moreover, overexpression of phdA rendered P. aeruginosa resistant to lysis mediated by superinfective bacteriophage Pf4 which was only detected in biofilms. The expression of bfmR was stimulated by conditions resulting in membrane perturbation and cell lysis. Thus, we propose that BfmR regulates biofilm development by controlling bacteriophage-mediated lysis and thus, cell death and eDNA release, via PhdA.

2011-06-01 | GSE28953 | GEO

Smalltalk in the big ocean - signaling molecules and DNA elicit chemotactic and genetic regulatory effects in surface associated Rhodobacteraceae

Project description:Transcriptional response of wildtype Phaeobacter inhibens to several secondary metabolites (AHLs, TDA) and eDNA

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Project description:airborne eDNA samples filtered in and outside bat roosts in Belize

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Transcriptome of Pseudomonas aeruginosa PAO1 genes induced by exposure to extracellular DNA

Project description:We identify a group of bacterial genes that are induced and repressed by the addition of eDNA, due to cation chelation, acidification or nutrient utilization.

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