Project description:CHX is an inhibitor of translation elongation often used in ribosome profiling experiments. There is evidence that CHX treatment of cells may cause artefacts in the distribution of ribosomes on mRNAs. We investigate this possibility in S. pombe by performing ribosome profiling in the presence and absence of this drug.
Project description:Data on absolute molecule numbers are rare but will empower the modeling, understanding and comparison of cellular functions and biological systems. We quantified transcriptomes and proteomes in fission yeast during both proliferation and quiescence. This rich resource provides the first comprehensive reference for all RNA and most protein concentrations in a eukaryote under key physiological conditions. This integrated dataset will support quantitative biology and afford unique biological insights into cell regulation. While mRNAs are typically expressed in a narrow range above 1 copy/cell, most long non-coding RNAs, except for a specific subset, are strongly repressed below 1 copy/cell. Cell cycle-regulated transcription tunes mRNA numbers to phase-specific requirements but can also lead to switch-like expression. Proteins greatly exceed mRNAs in abundance and dynamic range, and their numbers scales with functional demands. Upon transition to quiescence, the proteome composition changes substantially but, in stark contrast to mRNAs, proteins do not uniformly decrease but scale with cell volume.
Project description:To estimate mRNA steady-state levels we used RNA extracted from logarithmically growing fisson yeast cells on Affymetrix Yeast 2.0 Genechip arrays. The signal intensities from two independent biological repeats were averaged, resulting in measurements for 4818 out of 4962 nuclear protein-coding genes.