Abstract
This paper considers adiabatic reduction in a model of stochastic gene expression with bursting transcription considered as a jump Markov process. In this model, the process of gene expression with auto-regulation is described by fast/slow dynamics. The production of mRNA is assumed to follow a compound Poisson process occurring at a rate depending on protein levels (the phenomena called bursting in molecular biology) and the production of protein is a linear function of mRNA numbers. When the dynamics of mRNA is assumed to be a fast process (due to faster mRNA degradation than that of protein) we prove that, with appropriate scalings in the burst rate, jump size or translational rate, the bursting phenomena can be transmitted to the slow variable. We show that, depending on the scaling, the reduced equation is either a stochastic differential equation with a jump Poisson process or a deterministic ordinary differential equation. These results are significant because adiabatic reduction techniques seem to have not been rigorously justified for a stochastic differential system containing a jump Markov process. We expect that the results can be generalized to adiabatic methods in more general stochastic hybrid systems.
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Acknowledgments
This work was supported by the Natural Sciences and Engineering Research Council (NSERC, Canada), the Mathematics of Information Technology and Complex Systems (MITACS, Canada), the National Natural Science Foundation of China (NSFC 11272169, China) and the région Rhône-Alpes (mobility fellowship), and carried out in Montréal, Lyon and Beijing. We thank our colleague M. Tyran-Kamińska for valuable discussions.
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This research was supported by the Ecole Normale Superieure Lyon (ENS Lyon, France), the National Natural Science Foundation of China, and the Natural Sciences and Engineering Research Council of Canada.
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Yvinec, R., Zhuge, C., Lei, J. et al. Adiabatic reduction of a model of stochastic gene expression with jump Markov process. J. Math. Biol. 68, 1051–1070 (2014). https://doi.org/10.1007/s00285-013-0661-y
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DOI: https://doi.org/10.1007/s00285-013-0661-y
Keywords
- Adiabatic reduction
- Piecewise deterministic Markov process
- Stochastic bursting gene expression
- Quasi-steady state assumption
- Scaling limit