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MinION sequencing of Rickettsia typhi

ABSTRACT: MinION sequencing enables rapid whole genome assembly of Rickettsia typhi in a resource-limited setting

PROVIDER: PRJEB25678 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	ERR2438057_1.fastq.gz	Fastqsanger.gz
	ERR2438057_2.fastq.gz	Fastqsanger.gz

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Project description:Rickettsia spp. can cause mild to severe human disease. These intracellular bacteria are associated with arthropods, nematodes and trematodes, and usually, are efficiently transmitted transovarially to the progeny of the invertebrate host. We recently demonstrated foreign gene acquisition by lateral gene transfer in Rickettsia genomes. The unexpected presence of laterally transferred toxin-antitoxin (TA) genetic elements (including vapBC) in several Rickettsia genomes has not been connected with the pathogenic process or the host-bacteria relationship. We suspect that vapBC are selfish genetic elements that addict eukaryotic hosts to Rickettsia. We identified a statistical link between the transovarial transmission of Rickettsia in invertebrate hosts and the presence of TA operons, specifically vapBC, in the Rickettsia genome. These TA are neighboring to type IV secretion genes. Tunel assays and whole-genome expression of infected cells showed that antibiotic eradication of TA-containing Rickettsia from the host in cell culture initiates a proapoptotic program. Rickettsia VapC toxins inhibit the growth of transformed Escherichia coli and Saccharomyces cerevisiae. Rickettsia toxin presents in vitro RNase activity. Annexin-V staining and time-lapse video showed that intracytoplasmic injections of VapC toxins in cells cause apoptosis. These data demonstrate that host cells may develop a dependence on Rickettsia spp. expressing the vapBC operon. This would constitute a new evolutionary “mafia strategy” of intracellular bacteria based on host addiction.

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