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Related Experiment Video

Updated: Apr 25, 2026

Studying Habituation in Stentor coeruleus
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Molecular pathways for learning in the single-cell Stentor coeruleus.

Deepa H Rajan1, Ashley Albright1, Hyeyoon Kim2

  • 1Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA.

Current Biology : CB
|April 23, 2026
PubMed
Summary

Single-cell Stentor coeruleus exhibits cellular memory through habituation to mechanical taps. Protein synthesis inhibition surprisingly enhances this memory, suggesting novel learning mechanisms involving calcium signaling and phosphorylation.

Keywords:
CaMKIIbasal cognitioncell behaviorcellular cognitionhabituationlearningmemoryprotistsingle-cell learningtransgenerational memory

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Area of Science:

  • Cellular Biology
  • Neuroscience
  • Biochemistry

Background:

  • The single-celled organism Stentor coeruleus displays habituation, a simple form of learning, by ceasing to contract in response to repeated mechanical stimuli.
  • Understanding the molecular basis of this non-synaptic learning in Stentor can provide insights into fundamental memory mechanisms.

Purpose of the Study:

  • To investigate the molecular underpinnings of memory formation and retention in Stentor coeruleus during habituation.
  • To identify key proteins and signaling pathways involved in Stentor's learning process.

Main Methods:

  • Treatment with protein synthesis inhibitors (cycloheximide, puromycin) to assess their effect on habituation.
  • Proteomic and transcriptomic analyses to identify molecular changes during habituation and recovery.
  • RNA interference (RNAi) to knock down specific genes, such as SteCoe_6763.
  • Pharmacological manipulation using kinase/phosphatase inhibitors and extracellular calcium levels.

Main Results:

  • Protein synthesis inhibitors accelerated habituation and prolonged memory in Stentor, unlike in metazoa.
  • Proteomic and transcriptomic data implicated calcium signaling and protein phosphorylation in Stentor learning.
  • Knocking down SteCoe_6763 accelerated habituation; increased extracellular calcium enhanced learning.
  • Inhibitors of calcium/calmodulin-dependent kinase II (KN-93) impaired habituation, suggesting a role for this kinase.
  • Habituation memory was heritable, persisting through cell division.

Conclusions:

  • Cellular memory in Stentor involves modifications of mechanoreceptors via phosphorylation and calcium signaling.
  • Response recovery requires new protein synthesis, while memory formation may involve post-translational modifications.
  • Stentor's learning mechanisms offer a unique model for studying non-synaptic memory and its molecular basis.