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E. histolytica and E. invadens

ABSTRACT: E. histolytica and E. invadens

PROVIDER: PRJNA279304 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1927911.fastq.gz	Fastqsanger.gz
	SRR1927912.fastq.gz	Fastqsanger.gz
	SRR1927913.fastq.gz	Fastqsanger.gz
	SRR1927916.fastq.gz	Fastqsanger.gz
	SRR1927917.fastq.gz	Fastqsanger.gz

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The developmental life cycle of the enteric parasite Entamoeba invadens: transcriptome analysis reveals a crucial role for phospholipase D in stage conversion

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E. histolytica and E. invadens

Project description:This SuperSeries is composed of the SubSeries listed below.

2015-07-22 | GSE67232 | GEO

The developmental life cycle of the enteric parasite Entamoeba invadens: transcriptome analysis reveals a crucial role for phospholipase D in stage conversion

Project description:RNA-seq was performed on encysting and excysting E. invadens, a parasite of reptiles that is used as a model system to study stage conversion in Entamoeba species, including the human pathogen E. histolytica. The goal of the project was to identify changes to the transcriptome during development, in order to better understand the mechanisms of development. RNA was isolated from trophozoites, from encysting parasites (at 8, 24, 48 and 72 hours after transfer to encystation media) and from excysting parasites (2 and 8 hours after induction of excystation), converted to cDNA, and sequenced on a SOLiD platform. RNA-seq data was used to refine gene models, find potential unannotated genes, and identify genes that are developmentally regulated.

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Project description:mRNA profiles of cysts from Entamoeba invadens treatment with ethanol and treament with 200 nM of Trichostatin A during 24h, using Illumina NextSeq 500

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Anaerobic peroxisomes in Entamoeba histolytica metabolize myo-inositol

Project description:E. histolytica is believed to be devoid of peroxisomes, like most anaerobic protists. In this work, we provided the first evidence that peroxisomes are present in E. histolytica, although the set of proteins (peroxins) responsible for peroxisome biogenesis was reduced to only seven members (Pex1, Pex6, Pex5, Pex11, Pex14, Pex16, and Pex19). Targeting matrix proteins to peroxisomes is reduced to the PTS1-dependent pathway mediated via the soluble Pex5 receptor, while the PTS2 receptor Pex7 is absent. Immunofluorescence microscopy showed that peroxisomal markers (Pex5, Pex14, Pex16, Pex19) are present in vesicles distinct from mitosomes, the endoplasmic reticulum and the endosome/phagosome system, except Pex11, which has dual localization in peroxisomes and mitosomes. Immunoelectron microscopy revealed that Pex14 localized to vesicles of approximately 90-100 nm in diameter. Proteomic analyses of affinity-purified peroxisomes and in silico PTS1 predictions provided datasets of 655 and 56 peroxisomal candidates, respectively; however, only six proteins were shared by both datasets, including myo-inositol dehydrogenase (myo-IDH). Peroxisomal NAD-dependent myo-IDH appeared to be a dimeric enzyme with high affinity to myo-inositol (Km 0,044 mM) and can utilize also scyllo-inositol, D-glucose and D-xylose as substrates. Phylogenetic analyses revealed that orthologs of myo-IDH with PTS1 are present in E. dispar, E. nutalli and E. moshkovskii but not in E. invadens, and form a monophyletic clade of mostly peroxisomal orthologs with free-living M. balamuthi and P. schiedti. The presence of peroxisomes in E. histolytica and other archamoebae breaks the paradigm of peroxisome absence in anaerobes and provides a new potential target for the development of antiparasitic drugs.

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Role of REG 1 in Entamoeba histolytica colitis

Project description:Differential expression was used to access gene differences after Entamoeba histolytica infection. Entamoeba histolytica is an important diarrheal pathogen worldwide, and induces apoptosis of the intestinal epithelium as part of its disease process. Regenerating (REG) 1 protein is anti-apoptotic. We investigated the involvement of REG 1 in E. histolytica colitis. Colonic biopsy samples were obtained from 8 subjects with acute E. histolytica colitis, and again 60 day later during convalescence. Gene expression in the human colon during acute and convalescent E. histolytica disease was evaluated using microarray and confirmed by polymerase chain reaction (PCR). REG 1 protein expression was evaluated with immunohistochemistry. The mechanism of REG 1 involvement in E. histolytica disease was subsequently investigated with a mouse model. REG 1A and REG 1B were the most upregulated genes in the human intestine in acute versus convalescent E. histolytica disease (p=0.003 and p=0.006 respectively). PCR confirmed the microarray results (p=<0.001 and p=0.001 respectively). Increased REG 1A and REG 1B protein expression was similarly observed by immunohistochemistry. REG 1 -/-mice were found to be significantly more susceptible to E. histolytica infection than wild type mice.

2011-05-24 | GSE23750 | GEO

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