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The genome sequence of the filarial nematode Onchocerca volvulus

ABSTRACT: The genome sequence of the filarial nematode Onchocerca volvulus

PROVIDER: PRJEB2083 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR018815_1.fastq.gz	Fastqsanger.gz
	ERR018815_2.fastq.gz	Fastqsanger.gz
	ERR022512_1.fastq.gz	Fastqsanger.gz
	ERR022512_2.fastq.gz	Fastqsanger.gz
	ERR022849_1.fastq.gz	Fastqsanger.gz

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Project description:This data is part of a pre-publication release. For information on the proper use of pre-publication data shared by the Wellcome Trust Sanger Institute (including details of any publication moratoria), please see http://www.sanger.ac.uk/datasharing/ Onchocerca volvulus is a filarial nematode parasite of humans, causing Onchocerciasis, or River Blindness, which affects over 37 million people, mainly in Africa. It is a severely debilitating disease, which is transmitted to humans by black fly. This project aims to undertake high-throughput sequencing of Onchocerca volvulus transcriptome for de novo assembly of transcripts. The main objective of this project is to recognize genes expressed in given life stages.

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Project description:Onchocerciasis remains a significant cause of morbidity and economic loss in sub-Saharan Africa. Despite the existence of effective therapeutics, a prophylactic vaccine targeting the etiologic agent, Onchocerca volvulus, is needed to control ongoing disease and transmission. Mice were vaccinated against O. volvulus with a fusion of the recombinant antigens Ov-103 and Ov-RAL-2 (Ov-FUS-1) with Advax-CpG adjuvant. Immunized mice developed protective immunity with the killing of third-stage larvae (L3) within 36 hours of challenge infection. IgG from immunized mice passively transferred protective immunity to naïve mice, indicating that antigen-specific IgG mediated parasite elimination. Neutrophils were the most abundant subset of immune cells recruited to the parasite microenvironment in vivo, and their depletion resulted in the total loss of immune-mediated larval killing. Analysis of neutrophil gene expression revealed that both vaccination and the presence of O. volvulus larvae were capable of modulating neutrophil transcriptional activity. The mechanism by which antigen-specific IgG and neutrophils collaborated to kill L3 was independent of Fcγ receptors. However, the elimination of complement component C3 prevented vaccine-induced protection, which suggests these components may interact through the complement system. This study describes a vaccine-induced mechanism of protective immunity against O. volvulus L3 dependent on IgG, neutrophils, and complement, highlighting an effective collaboration between the innate and adaptive arms of the immune system to control O. volvulus infection.

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