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A Keller-Segel model for C elegans L1 aggregation

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  • Leon Avery
  • Brian Ingalls
  • Catherine Dumur
  • Alexander Artyukhin

Abstract

We describe a mathematical model for the aggregation of starved first-stage C elegans larvae (L1s). We propose that starved L1s produce and respond chemotactically to two labile diffusible chemical signals, a short-range attractant and a longer range repellent. This model takes the mathematical form of three coupled partial differential equations, one that describes the movement of the worms and one for each of the chemical signals. Numerical solution of these equations produced a pattern of aggregates that resembled that of worm aggregates observed in experiments. We also describe the identification of a sensory receptor gene, srh–2, whose expression is induced under conditions that promote L1 aggregation. Worms whose srh–2 gene has been knocked out form irregularly shaped aggregates. Our model suggests this phenotype may be explained by the mutant worms slowing their movement more quickly than the wild type.Author summary: Among the most complex of animal behaviors are collective behaviors, in which animals interact with each other so as to produce large-scale organization. Starved first-stage larvae of the nematode Caenorhabditis elegans exhibit such a behavior: they come together to form aggregates of several hundred worms. How and why they do this are unknown. To address these questions, we developed a mathematical model of starved L1 aggregation. This model reproduced the main features of the behavior.

Suggested Citation

  • Leon Avery & Brian Ingalls & Catherine Dumur & Alexander Artyukhin, 2021. "A Keller-Segel model for C elegans L1 aggregation," PLOS Computational Biology, Public Library of Science, vol. 17(7), pages 1-25, July.
  • Handle: RePEc:plo:pcbi00:1009231
    DOI: 10.1371/journal.pcbi.1009231
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    References listed on IDEAS

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    1. Mario de Bono & David M. Tobin & M. Wayne Davis & Leon Avery & Cornelia I. Bargmann, 2002. "Social feeding in Caenorhabditis elegans is induced by neurons that detect aversive stimuli," Nature, Nature, vol. 419(6910), pages 899-903, October.
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