RNA-seq Analyzes Transcriptomes of dnaB-Ts and dnaB-Ts ΔahpC at Both Permissive and Non-permissive Temperature

ABSTRACT: To generate a bona fide model to study post-stress baterial programmed cell death (PCD), we used a temperature-sensitive E. coli mutant (dnaB-Ts) since temperature stress can be rapidly reversed while other stress, such as antibotic treatment, is difficult to be rapidly and completely stopped and removed for post-stress PCD analysis. When cells were shifted from permissive (30 °C) to non-permissive temperature (42 °C), the dnaB-Ts ΔahpC double mutant maintained full surival while survival of the dnaB-Ts single mutant dropped 3 orders of magnitude; similarly, the double mutant showed much higher survival during treatments with quinolones and β-lactams at permissive temperature. The purpose of the RNA-seq analyses is to uncover molecular mechanisms underlying the increased survival of the dnaB-Ts ΔahpC double mutant by comparing its transcriptional profiles with that of the dnaB-Ts single mutant at both permissive and non-permissive temperature. The results showed that multiple antioxidative systems and stress response pathways were highly upregulated due to a deficiency of ahpC when combined with a dnaB-Ts mutation. The high expression of these genes are consistent with the lower levels of toxic reactive oxygen species (ROS) in the dnaB-Ts ΔahpC mutant than in the dnaB-Ts single mutant. Thus, the RNA-seq data supported that ROS are an important lethal factor in bacterial suicide pathways when bacterial cells are exposed to harsh stress.

ORGANISM(S): Escherichia coli

PROVIDER: GSE114262 | GEO | 2018/05/12

REPOSITORIES: GEO