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Parameter inference for stochastic biochemical models from perturbation experiments parallelised at the single cell level

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  • Anđela Davidović
  • Remy Chait
  • Gregory Batt
  • Jakob Ruess

Abstract

Understanding and characterising biochemical processes inside single cells requires experimental platforms that allow one to perturb and observe the dynamics of such processes as well as computational methods to build and parameterise models from the collected data. Recent progress with experimental platforms and optogenetics has made it possible to expose each cell in an experiment to an individualised input and automatically record cellular responses over days with fine time resolution. However, methods to infer parameters of stochastic kinetic models from single-cell longitudinal data have generally been developed under the assumption that experimental data is sparse and that responses of cells to at most a few different input perturbations can be observed. Here, we investigate and compare different approaches for calculating parameter likelihoods of single-cell longitudinal data based on approximations of the chemical master equation (CME) with a particular focus on coupling the linear noise approximation (LNA) or moment closure methods to a Kalman filter. We show that, as long as cells are measured sufficiently frequently, coupling the LNA to a Kalman filter allows one to accurately approximate likelihoods and to infer model parameters from data even in cases where the LNA provides poor approximations of the CME. Furthermore, the computational cost of filtering-based iterative likelihood evaluation scales advantageously in the number of measurement times and different input perturbations and is thus ideally suited for data obtained from modern experimental platforms. To demonstrate the practical usefulness of these results, we perform an experiment in which single cells, equipped with an optogenetic gene expression system, are exposed to various different light-input sequences and measured at several hundred time points and use parameter inference based on iterative likelihood evaluation to parameterise a stochastic model of the system.Author summary: A common result for the modelling of cellular processes is that available data is not sufficiently rich to uniquely determine the biological mechanism or even just to ensure identifiability of parameters of a given model. Perturbing cellular processes with informative input stimuli and measuring dynamical responses may alleviate this problem. With the development of novel experimental platforms, we are now in a position to parallelise such perturbation experiments at the single cell level. This raises a plethora of new questions. Is it more informative to diversify input perturbations but to observe only few cells for each input or should we rather ensure that many cells are observed for only few inputs? How can we calculate likelihoods and infer parameters of stochastic kinetic models from data sets in which each cell receives a different input perturbation? How does the computational efficiency of parameter inference methods scale with the number of inputs and the number of measurement times? Are there approaches that are particularly well-suited for such data sets? In this paper, we investigate these questions using the CcaS/CcaR optogenetic system driving the expression of a fluorescent reporter protein as primary case study.

Suggested Citation

  • Anđela Davidović & Remy Chait & Gregory Batt & Jakob Ruess, 2022. "Parameter inference for stochastic biochemical models from perturbation experiments parallelised at the single cell level," PLOS Computational Biology, Public Library of Science, vol. 18(3), pages 1-22, March.
  • Handle: RePEc:plo:pcbi00:1009950
    DOI: 10.1371/journal.pcbi.1009950
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    References listed on IDEAS

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    1. Andreas Milias-Argeitis & Marc Rullan & Stephanie K. Aoki & Peter Buchmann & Mustafa Khammash, 2016. "Automated optogenetic feedback control for precise and robust regulation of gene expression and cell growth," Nature Communications, Nature, vol. 7(1), pages 1-11, November.
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