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Toxoplasma gondii, Neospora caninum, Hammondia hammondi

ABSTRACT: Long read sequencing of Toxoplasma gondii and its relatives

PROVIDER: PRJNA638608 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	JACEGZ01.dat.gz	Other
	JACEGZ01.fasta.gz	Fasta.gz
	JACEGZ01.master.dat	Other
	JACEHA01.dat.gz	Other

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Gene expression analysis of Hammondia hammondi and Toxoplasma gondii sporulated oocysts

2014-10-02 | GSE61963 | GEO

Gene expression analysis of Hammondia hammondi and Toxoplasma gondii sporulated oocysts

Project description:To date little is known about the transcriptome of Hammondia hammondi, the nearest extant relative of Toxoplasma gondii. In this study we used an existing microarray to query Toxoplasma gondii and Hammondia hammondi transcript abundance in sporulated oocysts. Oocysts of the VEG strain of Toxoplasma gondii, and the HhCatGer041 strain of Hammondia hammondi, were isolated from cat feces by sucrose flotation, and sporulated for ~3-6 months in 2% sulfuric acid. RNA was isolated from Bleach-treated oocyst preparations using the Trizol reagent. RNA was biotinylated for hybridization to Toxo 169 Affymetrix chips using the Illumina Total Prep RNA labeling kit (Ambion). For each species 3 separate RNA isolations were performed on the same batch of oocysts and hybridized to individual microarrays.

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Project description:Recent advances in high throughput sequencing methodologies allow the opportunity to probe in depth the transcriptomes of organisms including N. caninum. In this project, we are using Illumina sequencing technology to analyze the transcriptome (RNA-Seq) of experimentally accessible stages (e.g. tachyzoites at different times points) of N. caninum NCLiv. The aim is to make transcriptional landscape maps at different time points at different life cycle stages of N. caninum and compare it with equivalent datasets from the closely related parasite Toxoplasma gondii

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Toxoplasma gondii

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Project description:Recent advances in high throughput sequencing methodologies allow the opportunity to probe in depth the transcriptomes of organisms including N. caninum and Toxoplasma gondii. In this project, we are using Illumina sequencing technology to analyze the transcriptome (RNA-Seq) of experimentally accessible stages (e.g. tachyzoites at different times points) of T. gondii VEG strain. The aim is to make comparative transcriptional landscape maps of Neospora and Toxoplasma at different time points at different life cycle stages and compare levels of expression of orthologous genes in these two organisms.

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Expression QTL mapping of Toxoplasma gondii genes

Project description:This SuperSeries is composed of the following subset Series: GSE11437: Expression QTL mapping of Toxoplasma gondii genes, Bradyzoite array GSE11514: Expression QTL mapping of Toxoplasma gondii genes, Tachyzoite array Keywords: SuperSeries Refer to individual Series

2008-05-22 | E-GEOD-11515 | biostudies-arrayexpress

Hammondia hammondi, an avirulent relative of Toxoplasma gondii, has functional orthologs of known T. gondii virulence genes.

Project description:Toxoplasma gondii is a ubiquitous protozoan parasite capable of infecting all warm-blooded animals, including humans. Its closest extant relative, Hammondia hammondi, has never been found to infect humans and, in contrast to T. gondii, is highly attenuated in mice. To better understand the genetic bases for these phenotypic differences, we sequenced the genome of a H. hammondi isolate (HhCatGer041) and found the genomic synteny between H. hammondi and T. gondii to be >95%. We used this genome to determine the H. hammondi primary sequence of two major T. gondii mouse virulence genes, TgROP5 and TgROP18. When we expressed these genes in T. gondii, we found that H. hammondi orthologs of TgROP5 and TgROP18 were functional. Similar to T. gondii, the HhROP5 locus is expanded, and two distinct HhROP5 paralogs increased the virulence of a T. gondii TgROP5 knockout strain. We also identified a 107 base pair promoter region, absent only in type III TgROP18, which is necessary for TgROP18 expression. This result indicates that the ROP18 promoter was active in the most recent common ancestor of these two species and that it was subsequently inactivated in progenitors of the type III lineage. Overall, these data suggest that the virulence differences between these species are not solely due to the functionality of these key virulence factors. This study provides evidence that other mechanisms, such as differences in gene expression or the lack of currently uncharacterized virulence factors, may underlie the phenotypic differences between these species.

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Gene expression analysis of Hammondia hammondi and Toxoplasma gondii sporulated oocysts

Project description:Gene expression analysis of Hammondia hammondi and Toxoplasma gondii sporulated oocysts

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