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The precision with which single cells of Dictyostelium discoideum can locate a source of cyclic AMP

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  • Chopra, Abha
  • Nanjundiah, Vidyanand

Abstract

When stimulated by a point source of cyclic AMP, a starved amoeba of Dictyostelium discoideum responds by putting out a hollow balloon-like membrane extension followed by a pseudopod. The effect of the stimulus is to influence the position where either of these protrusions is made on the cell rather than to cause them to be made. Because the pseudopod forms perpendicular to the cell surface, its location is a measure of the precision with which the cell can locate the cAMP source. Cells beyond 1h of starvation respond non-randomly with a precision that improves steadily thereafter. A cell that is starved for 1–2 h can locate the source accurately 43% of the time; and if starved for 6–7 h, 87% of the time. The response always has a high scatter; population-level heterogeneity reflects stochasticity in single cell behaviour. From the angular distribution of the response its maximum information content is estimated to be 2–3bits. In summary, we quantitatively demonstrate the stochastic nature of the directional response and the increase in its accuracy over time.

Suggested Citation

  • Chopra, Abha & Nanjundiah, Vidyanand, 2013. "The precision with which single cells of Dictyostelium discoideum can locate a source of cyclic AMP," Chaos, Solitons & Fractals, Elsevier, vol. 50(C), pages 3-12.
    • Handle: RePEc:eee:chsofr:v:50:y:2013:i:c:p:3-12
    DOI: 10.1016/j.chaos.2013.01.007
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    References listed on IDEAS

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