Biology – Quantitative Biology – Molecular Networks
Scientific paper
2007-03-13
Biology
Quantitative Biology
Molecular Networks
14 pages, 5 figures. To be published in the Banach Center Publications, he Proceedings of the workshop on "Stochastic models i
Scientific paper
We analyze three simple genetic circuits which involve transcriptional regulation and feedback: the autorepressor, the switch and the repressilator, that consist of one, two and three genes, respectively. Such systems are commonly simulated using rate equations, that account for the concentrations of the mRNAs and proteins produced by these genes. Rate equations are suitable when the concentrations of the relevant molecules in a cell are large and fluctuations are negligible. However, when some of the proteins in the circuit appear in low copy numbers, fluctuations become important and the rate equations fail. In this case stochastic methods, such as direct numerical integration of the master equation or Monte Carlo simulations are required. Here we present deterministic and stochastic simulations of the autorepressor, the switch and the repressilator. We show that fluctuations give rise to quantitative and qualitative changes in the dynamics of these systems. In particular, we demonstrate a fluctuations-induced bistability in a variant of the genetic switch and and noisy oscillations obtained in the repressilator circuit.
Balaban Nathalie Q.
Biham Ofer
Lipshtat Azi
Loinger Adiel
Perets Hagai B.
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