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Two mechanisms for the spontaneous emergence, execution, and reprogramming of chemical logic circuits

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  • Peng, Zhen
  • Adam, Zachary R.

Abstract

A key question in origin-of-life research is how primitive life or life-like systems obtained reusable and reprogrammable machinery of processing information to respond to various environmental and internal stimuli. One strategy to approach this question is to view living systems as universal chemical computers. This approach focuses upon uncovering how reusable and reprogrammable chemical NOT, AND, and OR logic gates could appear under prebiotically possible scenarios where simple chemicals and second- or lower-order reactions are more frequent than macromolecules and higher-order reactions. In this article, we theoretically model two generic mechanisms of forming Boolean gates based on geochemically plausible reaction systems that could have preceded complex biopolymers. The mechanisms exploit simple bistable autocatalytic systems to encode binary variables and use heterogeneous dilution rates to differentially activate or deactivate autocatalysis in different reactors. We found that NOT, AND, and OR gates, as well as more complex logic circuits, can spontaneously arise from connected, well-mixed flow reactors based on (i) catalysis by a heterodimer between mutually inhibitory autocatalysts or (ii) selectively permeable tunnels connecting reactors. Our results suggest that simple machinery can support the prebiotic emergence of complex chemical logic circuits and provide new guides for experimentally actualizing chemical computation.

Suggested Citation

  • Peng, Zhen & Adam, Zachary R., 2024. "Two mechanisms for the spontaneous emergence, execution, and reprogramming of chemical logic circuits," Chaos, Solitons & Fractals, Elsevier, vol. 184(C).
  • Handle: RePEc:eee:chsofr:v:184:y:2024:i:c:s0960077924005071
    DOI: 10.1016/j.chaos.2024.114955
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    References listed on IDEAS

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