Efficient analysis of stochastic gene dynamics in the non-adiabatic regime using piecewise deterministic Markov processes
Journal Article
·
· Journal of the Royal Society Interface
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Manchester, Manchester (United Kingdom)
- Duke Univ., Durham, NC (United States); Center for Genomic and Computational Biology, Durham, NC (United States)
Single-cell experiments show that gene expression is stochastic and bursty, a feature that can emerge from slow switching between promoter states with different activities. In addition to slow chromatin and/or DNA looping dynamics, one source of long-lived promoter states is the slow binding and unbinding kinetics of transcription factors to promoters, i.e. the non-adiabatic binding regime. Here, we introduce a simple analytical framework, known as a piecewise deterministic Markov process (PDMP), that accurately describes the stochastic dynamics of gene expression in the non-adiabatic regime. We illustrate the utility of the PDMP on a non-trivial dynamical system by analysing the properties of a titration-based oscillator in the non-adiabatic limit. We first show how to transform the underlying chemical master equation into a PDMP where the slow transitions between promoter states are stochastic, but whose rates depend upon the faster deterministic dynamics of the transcription factors regulated by these promoters. We show that the PDMP accurately describes the observed periods of stochastic cycles in activator and repressor-based titration oscillators. We then generalize our PDMP analysis to more complicated versions of titration-based oscillators to explain how multiple binding sites lengthen the period and improve coherence. Finally, we show how noise-induced oscillation previously observed in a titration-based oscillator arises from non-adiabatic and discrete binding events at the promoter site.
- Research Organization:
- Los Alamos National Laboratory (LANL)
- Sponsoring Organization:
- LDRD; USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1419760
- Report Number(s):
- LA-UR-17-29798
- Journal Information:
- Journal of the Royal Society Interface, Journal Name: Journal of the Royal Society Interface Journal Issue: 138 Vol. 15; ISSN 1742-5689
- Publisher:
- The Royal SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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