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Issue No. 03 - May-June (2012 vol. 9)
ISSN: 1545-5963
pp: 871-884
Peng Li , Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA
Yong Zhang , Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA
Garng M. Huang , Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA
Bistability/Multistability has been found in many biological systems including genetic memory circuits. Proper characterization of system stability helps to understand biological functions and has potential applications in fields such as synthetic biology. Existing methods of analyzing bistability are either qualitative or in a static way. Assuming the circuit is in a steady state, the latter can only reveal the susceptibility of the stability to injected DC noises. However, this can be inappropriate and inadequate as dynamics are crucial for many biological networks. In this paper, we quantitatively characterize the dynamic stability of a genetic conditional memory circuit by developing new dynamic noise margin (DNM) concepts and associated algorithms based on system theory. Taking into account the duration of the noisy perturbation, the DNMs are more general cases of their static counterparts. Using our techniques, we analyze the noise immunity of the memory circuit and derive insights on dynamic hold and write operations. Considering cell-to-cell variations, our parametric analysis reveals that the dynamic stability of the memory circuit has significantly varying sensitivities to underlying biochemical reactions attributable to differences in structure, time scales, and nonlinear interactions between reactions. With proper extensions, our techniques are broadly applicable to other multistable biological systems.
system theory, biochemistry, cellular biophysics, genetics, noise, multistable biological systems, quantifying dynamic stability, biological functions, synthetic biology, injected DC noises, biological networks, genetic conditional memory circuit, dynamic noise margin concepts, system theory, noisy perturbation, static counterparts, cell-cell variations, parametric analysis, biochemical reactions, nonlinear interactions, Noise, Proteins, Circuit stability, Genetics, Stability analysis, Integrated circuit modeling, RNA, dynamic noise margin., Dynamic stability, genetic memory, gene circuit

Peng Li, Yong Zhang and G. M. Huang, "Quantifying Dynamic Stability of Genetic Memory Circuits," in IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol. 9, no. , pp. 871-884, 2012.
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