mid2 mutant 4 hour exposure to Congo Red

We did transcription profiling on the effect of mid2 deletion, gene involved in cell wall stress response Keywords: cell wall stress response S. cerevisiae (mid2 mutant strain BY4741) was grown on YEPD. For Congo Red experiments, yeast cells were grown overnight at 24 °C to an optical density 0.8 - 1 (A600). The culture was refreshed to 0.2 O.D and grown at 24 °C for 2h 30min. Next, culture was divided into two parts. One continues growing under same conditions (non-treated culture) while the other was supplemented with 30 μg/ml of Congo Red. Cells were collected at 4 hours of growth, frozen at -80 °C and processed for RNA extraction. The total RNA from two different cultures was analyzed, and, in addition, for each sample two different hybridizations were performed, including fluorochrome swapping in order to minimize transcriptional changes due to technical variability. This therefore corresponded to four DNA microarrays analyzed for each condition.