Combining Spinach-tagged RNA and gene localization to image gene expression in live yeast

David Guet (1) , Laura Burns (2) , Suman Maji (1) , Jérôme Boulanger (3) , Pascal Hersen (4) , Susan Wente (2) , Jean Salamero (5) , Catherine Dargemont (1)

1 GenCellDi (UMR_S_944) - Génomes, biologie cellulaire et thérapeutiques
2 Vanderbilt University School of Medicine [Nashville]
3 Biologie Cellulaire et Cancer
4 MSC - Matière et Systèmes Complexes
5 Mécanismes moléculaires du transport intracellulaire

Although many factors required for the formation of export-competent mRNPs have been described, an integrative view of the spatiotemporal coordinated cascade leading mRNPs from their site of transcription to their site of nuclear exit, at a single cell level, is still partially missing due to technological limitations. Here we report that the RNA Spinach aptamer is a powerful tool for mRNA imaging in live S. cerevisiae with high spatial-temporal resolution and no perturbation of the mRNA biogenesis properties. Dedicated image processing workflows are developed to allow detection of very low abundance of transcripts, accurate quantitative dynamic studies, as well as to provide a localization precision close to 100 nm at consistent time scales. Combining these approaches has provided a state-of-the-art analysis of the osmotic shock response in live yeast by localizing induced transcription factors, target gene loci and corresponding transcripts.

Domaines: Génomique, Transcriptomique et Protéomique [q-bio.GN]

David Guet, Laura Burns, Suman Maji, Jérôme Boulanger, Pascal Hersen, et al.. Combining Spinach-tagged RNA and gene localization to image gene expression in live yeast. Nature Communications, 2015, 6, pp.8882. ⟨10.1038/ncomms9882⟩. ⟨hal-01725192⟩