Simulating the temporal modulation of inducible DNA damage response in Escherichia coli.
Living organisms make great efforts to maintain their genetic information integrity. However, DNA is vulnerable to many chemical or physical agents. To rescue the cell timely and effectively, the DNA damage response system must be well controlled. Recently, single cell experiments showing that after DNA damage, expression of the key DNA damage response regulatory protein oscillates with time. This phenomenon is observed both in eukaryotic and bacterial cells. We establish a model to simulate the DNA damage response (SOS response) in bacterial cell Escherichia coli. The simulation results are compared to the experimental data. Our simulation results suggest that the modulation observed in the experiment is due to the fluctuation of inducing signal, which is coupled with DNA replication. The inducing signal increases when replication is blocked by DNA damage and decreases when replication resumes.
Ni
Ming
M
Center for Theoretical Biology and Department of Physics, Peking University, Beijing, China.
Wang
Si-Yuan
SY
Li
Ji-Kun
JK
Ouyang
Qi
Q
D003198:Computer Simulation; D004249:DNA Damage / Q000502:physiology*; D004269:DNA, Bacterial / Q000502:physiology* / Q000528:radiation effects; D004926:Escherichia coli / Q000235:genetics* / Q000528:radiation effects; D029968:Escherichia coli Proteins / Q000235:genetics*; D008957:Models, Genetic; D013014:SOS Response, Genetics / Q000187:drug effects / Q000502:physiology*; D013995:Time; D014466:Ultraviolet Rays
D004269:DNA, Bacterial; D029968:Escherichia coli Proteins