Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

In vivo transcriptome analysis of Toxoplasma gondii

ABSTRACT: This study utilizes global microarray analysis to identify how T. gondii alters its transcriptome in response to the in vivo microenvironment during the innate immune response (four days post-infection) relative to growth in fibroblast cells in vitro. To distinguish changes in the parasite transcriptome dependent or independent of the host immune response the parasite transcriptome was examined in IFN-gamma gene deleted mice in addition to wild type mice.

ORGANISM(S): Toxoplasma gondii

SUBMITTER: DANA MORDUE

PROVIDER: E-MEXP-3579 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Identification of Toxoplasma gondii genes responsive to the host immune response during in vivo infection.

Skariah Sini S Mordue Dana G DG

PloS one 20121010 10

Toxoplasma gondii is an obligate intracellular protozoa parasite that causes the disease toxoplasmosis. It resides within host cells in a parasitophorous vacuole distinct from the host cell endocytic system. T. gondii was used as a model to investigate how obligate intracellular parasites alter their gene expression in response to the host immune response during infection compared to growth in host cells in vitro. While bacterial pathogens clearly alter gene expression to adapt to the host envir ...[more]

PMID: 23071600

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Project description:Quantitative studies of the P. falciparum transcriptome have shown that the tightly controlled progression of the parasite through the intraerythrocytic developmental cycle (IDC) is accompanied by a continuous gene expression cascade where most expressed genes exhibit a single transcriptional peak. Since proteins represent the decisive business end of gene expression, understanding the correlation between mRNA and protein levels is crucial for inferring biological activity from transcriptional gene expression data. While pertinent studies on other organisms show that as little as 20-40% of protein abundance variation may be attributable to corresponding mRNA levels, the situation in Plasmodium is further complicated by the dynamic nature of the cyclic gene expression cascade where the mRNA levels of most genes change constantly during the IDC. In this study, we simultaneously determined mRNA and protein abundance profiles for P. falciparum parasites during the IDC at 2-hour resolution based on spotted oligonucleotide microarrays and 2D-protein gels in combination with DIGE fluorescent dyes. Intriguingly, most proteins are represented by more than one isoform, presumably due to post-translational modifications. Analysis of 366 protein abundance profiles and the corresponding mRNA levels shows that in 67.2% of cases the protein abundance peaks at least 8 hours after the mRNA level peak. While it may be tempting to interpret this as evidence for widespread post-transcriptional gene regulation additional analyses including computer modeling demonstrate that in >60% of these cases the observed protein profiles including the peak lag times could arise as a consequence of the corresponding mRNA levels when simple translation and degradation dynamics are assumed. We further characterize and illustrate these dynamics and show that even human host proteins within the parasite may be subject to similar dynamics as their parasite counterparts. 24 timepoint samples were harvested from a tightly synchronous 6.5 liter biofermenter culture of P. falciparum (Dd2) at 2-hour intervals during one entire intraerythrocytic developmental cycle and compared against a 3D7 RNA reference pool.

Dataset Information

In vivo transcriptome analysis of Toxoplasma gondii

Publications

Identification of Toxoplasma gondii genes responsive to the host immune response during in vivo infection.

Similar Datasets

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