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Effect of Rom1 silencing on gene expression in Entamoeba histolytica

ABSTRACT: Entamoeba histolytica trophozoites epigenetically silenced for ameobapore A (G3 parasites) were additionally silenced for the Rhomboid gene Rom1 (EHI_197460) using the mechanism outlined in Mirelman et al. Parasite. 2008 Sep;15(3):266-74 (PMID 18814693). Rom1 silencing was confirmed by RT-PCR. Gene expression in these parasites was compared to that of the parent G3 strain.

ORGANISM(S): Entamoeba histolytica

PROVIDER: GSE21522 | GEO | 2010/07/07

SECONDARY ACCESSION(S): PRJNA125959

REPOSITORIES: GEO

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Effect of Rom1 silencing on gene expression in Entamoeba histolytica

Project description:Entamoeba histolytica trophozoites epigenetically silenced for ameobapore A (G3 parasites) were additionally silenced for the Rhomboid gene Rom1 (EHI_197460) using the mechanism outlined in Mirelman et al. Parasite. 2008 Sep;15(3):266-74 (PMID 18814693). Rom1 silencing was confirmed by RT-PCR. Gene expression in these parasites was compared to that of the parent G3 strain. RNA was isolated from axenically grown G3 and Rom1 silenced parasites, and hybridized to a custom Affymetrix array for E. histolytica. Two biological replicates were performed for each condition.

2010-07-07 | E-GEOD-21522 | biostudies-arrayexpress

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Project description:Entamoeba histolytica is a protozoan parasite which causes colitis and liver abscesses. Using a genomic DNA microarray consisting of 1.6 - 2.0 kb genomic inserts we have generated a transcriptional profile of 1,971 unique parasite transcripts. The 12 arrays in this experiment set were used to estimate relative transcript abundance for Entamoeba histolytica (HM-1:IMSS) trophozoites in mid-logarithmic growth.

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Coactosin phosphorylation controls Entamoeba histolytica 1 cell membrane protusions and cell motility

Project description:Invasion of the colon wall by Entamoeba histolytica during amoebic dysentery entails migration of trophozoites through tissue layers that are rich in extracellular matrix (ECM). Transcriptional silencing of the E. histolytica matrix surface metalloprotease EhMSP-1 produces hyper-adherent, less motile trophozoites that are deficient in forming invadosomes. Reversible protein phosphorylation is often implicated in regulation of cell motility and invadosome formation. To identify such intermediaries of the EhMSP-1 silenced phenotype, here we compared the phosphoproteome of EhMSP-1 silenced and vector control trophozoites using quantitative mass spectrometry based proteomics. Six proteins were found to be differentially phosphorylated in EhMSP-1 silenced and control cells, including EhCoactosin, a member of the ADF/Cofilin family of actin binding proteins, which was hyperphosphorylated at serine 147 (S147). Regulated over-expression of wild type, phosphomimetic (S147D), and non phosphorylatable (S147A) EhCoactosin variants was used to test if S147 phosphorylation functions in control of E. histolytica actin dynamics. Each of the over-expressed proteins co37 localized with F-actin during E. histolytica phagocytosis. Nonetheless, trophozoites overexpressing EhCoactosin S147D formed more and poorly coordinated small membrane protrusions compared to control or S147A expressing cells, while trophozoites overexpressing EhCoactosin S147A were significantly more motile within a model of mammalian ECM. Therefore, although EhCoactosin’s actin-binding ability appeared unaffected by S147 phosphorylation, EhCoactosin phosphorylation helps to regulate amoebic motility. These data help to understand the mechanisms underlying altered adherence and motility in EhMSP-1 silenced trophozoites, and lay the groundwork for identifying kinases and phosphatases critical for control of amoebic invasiveness.

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Project description:Purpose: Transcriptome characterization of Entamoeba histolytica trophozoites adapted to Auranofin Total RNA was extracted from control trophozoites (WT) and AFAT using the TRI reagent kit, according to the manufacturer instructions (Sigma-Aldrich USA). 6 RNAseq libraries were produced according to manufacturer protocol (NEBNext UltraII Directional RNA Library Prep Kit for Illumina, cat no. E7760) using 800ng total RNA. mRNAs pull-up was performed using Magnetic Isolation Module (NEB, cat no. E7490). All libraries were mixed into a single tube with equal molarity. The RNAseq data was generated on Illumina NextSeq500, 75 single-end read, high output mode (Illumina, cat no. 200249) The number of reads per gene was counted using Htseq-count (v0.9.1) Results: Transcriptomics of Entamoeba histolytica trophozoites that were adapted to 2 uM Auranofin revealed an upregulation of genes encoding cytoskeletal proteins, dehydrogenases and guanyl-nucleotide exchange factors. Conclusions: Adaptation to Auranofin comes with a fitness cost for E.histolytica that includes a decreased growth rate and virulence and sensitivity to Oxidative stress, Nitrosative stress and to Metronidazole. Overexpression of genes whose products are sensitive to Auranofin-mediated oxidation may represent an important step in the adaptation process to Auranofin and EhTrxR does not seem to be central for this process.

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