Abstract
Homeostasis occurs in a control system when a quantity remains approximately constant as a parameter, representing an external perturbation, varies over some range. Golubitsky and Stewart (J Math Biol 74(1–2):387–407, 2017) developed a notion of infinitesimal homeostasis for equilibrium systems using singularity theory. Rhythmic physiological systems (breathing, locomotion, feeding) maintain homeostasis through control of large-amplitude limit cycles rather than equilibrium points. Here we take an initial step to study (infinitesimal) homeostasis for limit-cycle systems in terms of the average of a quantity taken around the limit cycle. We apply the “infinitesimal shape response curve” (iSRC) introduced by Wang et al. (SIAM J Appl Dyn Syst 82(7):1–43, 2021) to study infinitesimal homeostasis for limit-cycle systems in terms of the mean value of a quantity of interest, averaged around the limit cycle. Using the iSRC, which captures the linearized shape displacement of an oscillator upon a static perturbation, we provide a formula for the derivative of the averaged quantity with respect to the control parameter. Our expression allows one to identify homeostasis points for limit cycle systems in the averaging sense. We demonstrate in the Hodgkin–Huxley model and in a metabolic regulatory network model that the iSRC-based method provides an accurate representation of the sensitivity of averaged quantities.
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Notes
“all the vital mechanisms, however varied they may be, have only one object, that of preserving constant the conditions of life in the internal environment”—quoted in translation by Cannon (1929).
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Acknowledgements
PT thanks the Oberlin College Department of Mathematics for research support.
Funding
This work was supported in part by National Institutes of Health BRAIN Initiative Grant R01 NS118606, and NSF Grant DMS-2052109.
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ZY and PJT designed the study. ZY and PJT derived the results. ZY performed the simulations. ZY and PJT wrote the manuscript.
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Custom code written in Matlab is available at https://github.com/zhuojunyu-appliedmath/Homeostasis-iSRC.
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A Hodgkin–Huxley equations
A Hodgkin–Huxley equations
In the Hodgkin–Huxley system (20), the activation/inactivation rate functions are
Parameter values for the system are listed in Table 1.
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Yu, Z., Thomas, P.J. A homeostasis criterion for limit cycle systems based on infinitesimal shape response curves. J. Math. Biol. 84, 24 (2022). https://doi.org/10.1007/s00285-022-01724-4
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DOI: https://doi.org/10.1007/s00285-022-01724-4