About the Project
Exposure to acute stress reduces cell viability or fitness and therefore immediate adaption is crucial for cell survival. Such rapid change of cell physiology requires coordinate and precise alteration of gene expression. One of the most dramatic transformations happens at the transcriptional level. Transcription of large number of genes is shut down while stress responders are activated and robustly transcribed. Synthesized stress-induced mRNAs are not subjected to quality control  and are exported to the cytoplasm via specific, promoter-dependent mechanisms . Such unusual mRNA biology of stress-induced genes enables cells to immediately tailor protein production and allows them to survive extreme conditions.
In eukaryotic cells mRNA 3’ end processing, which involves endonucleolytic cleavage followed by the addition of the poly(A) tail, is one of the most important steps in gene expression regulation . For example, the 3’ end maturation complex responds to cellular stimuli and decides about the nuclear and cytoplasmic fate of mRNA through the generation of distinct 3’ end termini. Furthermore, a poly(A) tail protects mRNA from degradation and promotes translation. The function of the cleavage and polyadenylation machinery extends far beyond simple maturation of mRNA ends.
Recent studies reveal that cellular stress such as osmotic shock, viral infections or carcinogenesis can all affect mRNA 3’ end formation [4-6]. Thus, the goal of this project is to employ a wide range of high-throughput and classic RNA analysis in a model organism Saccharomyces cerevisiae, to investigate how the mRNA 3’ processing regulates expression of stress-induced genes and contributes to the cellular stress response in microorganisms.
Techniques that will be undertaken during the project:
- High-throughput RNA analyses:Total and nuclear RNA sequencing (RNA-seq) and transient transcriptome sequencing (TT-seq)
- Classic RNA analyses: Northern blotting and reverse transcription followed by quantitative PCR (RT-qPCR; real-time PCR)
- Chromatin immunoprecipitation (ChIP and ChIP-seq)
- Western blotting
- Cell sorting
- Protein depletion approaches: Anchor Away and Degron-tag
- Fluorescent microscopy
- Cloning, yeast strain constructions: tagging, gene deletions
- Survival assays
We are looking for a highly motivated person interested in RNA biology. Applicants should have a strong background in molecular biology and hold or expect to obtain at least an Upper Second Class Honours Degree (or equivalent) in genetics/molecular biology/medicine or relevant field.
Informal enquiries about the post are strongly encouraged and should be directed to Dr Pawel Grzechnik ([Email Address Removed].)
Grzechnik lab website :https://www.grzechniklab.com
The purpose of the Darwin Trust’s programme is to award studentships to individuals who are ineligible for UK Research Council applications allowing them to pursue a PhD in microbiology.
Zid, B.M. and E.K. O’Shea, Promoter sequences direct cytoplasmic localization and translation of mRNAs during starvation in yeast. Nature, 2014. 514(7520): p. 117-21.
Proudfoot, N.J., Transcriptional termination in mammals: Stopping the RNA polymerase II juggernaut. Science, 2016. 352(6291): p. aad9926.
Vilborg, A., et al., Widespread Inducible Transcription Downstream of Human Genes. Mol Cell, 2015. 59(3): p. 449-61.
Rutkowski, A.J., et al., Widespread disruption of host transcription termination in HSV-1 infection. Nat Commun, 2015. 6: p. 7126.
Grosso, A.R., et al., Pervasive transcription read-through promotes aberrant expression of oncogenes and RNA chimeras in renal carcinoma. Elife, 2015. 4.
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