Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Dynamic mRNA Expression analysis of cells undergoing synchronous life-cycle differentiation in Trypanosoma brucei

ABSTRACT: mRNA expression profiles of trypanosomes from two discrete bloodstream form stages of the parasite (slender and stumpy forms), as well as during the transition of the stumpy population to the procyclic life-cycle stage were studied. Our analysis represents the first comparison of in vivo derived pleomorphic slender cells with genetically identical stumpy forms, and a first analysis of the dynamic changes in mRNA profile that accompany the transition to procyclic forms. Twenty nine RNA samples were generated (5 biological replicates of Stumpy (0h), 1h, 6h, 18h and 48h, and 4 biological replicates of slender forms. Four arrays failed QC.

ORGANISM(S): Trypanosoma brucei

SUBMITTER: Alasdair Ivens

PROVIDER: E-GEOD-17026 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Genome-wide expression profiling of in vivo-derived bloodstream parasite stages and dynamic analysis of mRNA alterations during synchronous differentiation in Trypanosoma brucei.

Kabani Sarah S Fenn Katelyn K Ross Alan A Ivens Al A Smith Terry K TK Ghazal Peter P Matthews Keith K

BMC genomics 20090911

<h4>Background</h4>Trypanosomes undergo extensive developmental changes during their complex life cycle. Crucial among these is the transition between slender and stumpy bloodstream forms and, thereafter, the differentiation from stumpy to tsetse-midgut procyclic forms. These developmental events are highly regulated, temporally reproducible and accompanied by expression changes mediated almost exclusively at the post-transcriptional level.<h4>Results</h4>In this study we have examined, by whole ...[more]

PMID: 19747379

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Project description:Trypanosoma brucei subspecies infect humans and animals in sub-Saharan Africa. This early diverging eukaryote shows many novel features in basic biological processes, including the use of polycistronic transcription to generate all protein-coding mRNAs. Therefore we hypothesized that translational control provides a means to tune gene expression during parasite development in mammalian and fly hosts. We used ribosome profiling to examine genome-wide protein production in animal-derived slender bloodstream forms and cultured procyclic (insect midgut) forms. About one-third of all CDSs showed statistically significant regulation of protein production between the two stages. Of these, more than two-thirds showed a change in translation efficiency, but few were controlled by this parameter alone. Ribosomal proteins were translated poorly, especially in animal-derived parasites. A disproportionate number of metabolic enzymes were up-regulated at the mRNA level in procyclic forms, as were variant surface glycoproteins in bloodstream forms. Comparison with cultured bloodstream forms from another strain identified stage-specific changes in protein production that transcend strain and growth conditions. Genes with upstream ORFs had a lower mean translation efficiency but no evidence was seen for involvement of these ORFs in stage-regulation. Ribosome profiling revealed that differences in the production of specific proteins in T. brucei slender bloodstream and procyclic forms are more common than anticipated from analysis of mRNA abundance. While in vivo and in vitro derived slender bloodstream forms of different strains are more similar to one another than to procyclic forms, they showed numerous differences at both the mRNA and protein production level. Ribosome profiling and mRNA libraries were constructed in triplicate from in vitro PCF and in vivo BF lifestages of theT. brucei Treu927 and in vitro T. brucei Lister427, to evaluate role of translational gene regulation

Dataset Information

Dynamic mRNA Expression analysis of cells undergoing synchronous life-cycle differentiation in Trypanosoma brucei

Publications

Genome-wide expression profiling of in vivo-derived bloodstream parasite stages and dynamic analysis of mRNA alterations during synchronous differentiation in Trypanosoma brucei.

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