Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Effect of treatment with H2O2 or DPTA-NONOate on E. histolytica

ABSTRACT: E. histolytica of strains HM1:IMSS (virulent) and Rahman (avirulent) were examined for response to oxidative and nitrosative stress. Response to oxidative stress in E. histolytica was assayed by treating Eh (HM1:IMSS) and Eh (Rahman) with 1mM H2O2 for 60 minutes or 90 minutes and comparing transcription to parasites grown in TYI. In addition, response to nitosative stress was assayed in Eh (HM1:IMSS) by treatment for 60 minutes with 200 µM DPTA-NONOate.

ORGANISM(S): Entamoeba histolytica

SUBMITTER: Gretchen Ehrenkaufer

PROVIDER: E-GEOD-11811 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Entamoeba histolytica modulates a complex repertoire of novel genes in response to oxidative and nitrosative stresses: implications for amebic pathogenesis.

Vicente João B JB Vicente João B JB Ehrenkaufer Gretchen M GM Saraiva Lígia M LM Teixeira Miguel M Singh Upinder U

Cellular microbiology 20080905 1

Upon host infection, the protozoan parasite Entamoeba histolytica is confronted with reactive oxygen and nitrogen species and must survive these stresses in order to cause invasive disease. We analysed the parasite's response to oxidative and nitrosative stresses, probing the transcriptional changes of trophozoites of a pathogenic strain after a 60 min exposure to H2O2 (1 mM) or a NO donor (dipropylenetriamine-NONOate, 200 microM), using whole-genome DNA microarrays. Genes encoding reactive oxyg ...[more]

PMID: 18778413

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Project description:Entamoeba histolytica is a protozoan parasite that causes colitis and liver abscesses. Several Entamoeba species and strains with differing levels of virulence have been identified. E. histolytica HM-1:IMSS is a virulent strain, E. histolytica Rahman is a nonvirulent strain, and Entamoeba dispar is a nonvirulent species. We used an E. histolytica DNA microarray consisting of 2,110 genes to assess the transcriptional differences between these species/strains with the goal of identifying genes whose expression correlated with a virulence phenotype. We found 415 genes expressed at lower levels in E. dispar and 32 genes with lower expression in E. histolytica Rahman than in E. histolytica HM-1:IMSS. Overall, 29 genes had decreased expression in both the nonvirulent species/strains than the virulent E. histolytica HM-1:IMSS. Interestingly, a number of genes with potential roles in stress response and virulence had decreased expression in either one or both nonvirulent Entamoeba species/strains. These included genes encoding Fe hydrogenase (9.m00419), peroxiredoxin (176.m00112), type A flavoprotein (6.m00467), lysozyme (6.m00454), sphingomyelinase C (29.m00231), and a hypothetical protein with homology to both a Plasmodium sporozoite threonine-asparagine-rich protein (STARP) and a streptococcal hemagglutinin (238.m00054). The function of these genes in Entamoeba and their specific roles in parasite virulence need to be determined. We also found that a number of the non-long-terminal-repeat retrotransposons (EhLINEs and EhSINEs), which have been shown to modulate gene expression and genomic evolution, had lower expression in the nonvirulent species/strains than in E. histolytica HM-1:IMSS. Our results, identifying expression profiles and patterns indicative of a virulence phenotype, may be useful in characterizing the transcriptional framework of virulence. A species experiment design type assays differences between distinct species. Keywords: species_design

Dataset Information

Effect of treatment with H2O2 or DPTA-NONOate on E. histolytica

Publications

Entamoeba histolytica modulates a complex repertoire of novel genes in response to oxidative and nitrosative stresses: implications for amebic pathogenesis.

Similar Datasets

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