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Neisseria gonorrhoeae F62

ABSTRACT: Deep sequencing-based analysis of the anaerobic stimulon in Neisseria gonorrhoeae

PROVIDER: PRJNA136781 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR090240.fastq.gz	Fastqsanger.gz
	SRR090241.fastq.gz	Fastqsanger.gz
	SRR090242.fastq.gz	Fastqsanger.gz
	SRR090243.fastq.gz	Fastqsanger.gz

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Deep sequencing-based analysis of the anaerobic stimulon in Neisseria gonorrhoeae

Project description:Maintenance of an anaerobic respiratory system in the obligate human pathogen, Neisseria gonorrhoeae, suggests that an anaerobic lifestyle may be important during the course of infection. However, at this point there have been no studies analyzing the complete gonococcal transcriptome response to anaerobiosis. Here we performed deep sequencing to compare the gonococcal transcriptomes of aerobic and anaerobically grown cells. We found that the anaerobic stimulon in gonococci was large, and that 198 chromosomal genes were found to be differentially expressed. We also observed a large induction of genes encoded within the cryptic plasmid, pJD1. Secondary analysis of genes found to be differentially expressed by RNA-seq using translational-lacZ fusions or RT-PCR demonstrated the RNA-seq results to be very reproducible. Surprisingly, many genes of prophage origin were induced anaerobically, as well as several transcriptional regulators previously unknown to be involved in anaerobic growth. We also confirmed expression and regulation of a small RNA, likely a functional equivalent of fnrS in the Enterobacteriaceae family. Several novel factors were identified to be anaerobically regulated, as well as a large number of hypothetical proteins were induced.

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Neisseria gonorrhoeae F62

Project description:Neisseria gonorrhoeae F62 Transcriptome or Gene expression

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Project description:Neisseria gonorrhoeae, the etiologic agent of gonorrhea, is frequently asymptomatic in women, often leading to chronic infections. One factor contributing to this may be biofilm formation. N. gonorrhoeae can form biofilms over glass and plastic surfaces. There is also evidence that biofilm formation may occur during natural cervical infection. To further study the mechanism of this biofilm formation, transcriptional profiles of N. gonorrhoeae biofilm were compared to planktonic profiles. Biofilm RNA was extracted from N. gonorrhoeae 1291 grown for 48 hours in continuous flow chambers over glass. Planktonic RNA was extracted from the biofilm runoff. When biofilm was compared to planktonic growth, 3.8 % of the genome was differentially regulated. Genes highly up-regulated in biofilm included aniA, norB, and ccp, which play critical roles in anaerobic metabolism and oxidative stress tolerance. Down-regulated genes included the nuo gene cluster (NADH dehydrogenase) and the cytochrome bcI complex, which are involved in aerobic respiration and are thought to contribute to endogenous oxidative stress. Furthermore, we determined that aniA, ccp, and norB insertional mutants are attenuated for biofilm formation over glass and transformed human cervical epithelial cells (THCEC). This data suggests that biofilm formation could minimize oxidative stress during cervical infection and allow N. gonorrhoeae to maintain a nitric oxide steady state that may be anti-inflammatory.

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