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Molecular control of irreversible bistability during trypanosome developmental commitment.

Maria Rosa Domingo-Sananes1, Balazs Szöőr1, Michael A J Ferguson2

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The differentiation of Trypanosoma brucei into insect-stage forms is an irreversible process. This commitment requires new protein synthesis and is controlled by Nek-related kinase, marking a key step in parasite development.

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Area of Science:

  • Parasitology
  • Cell Biology
  • Molecular Biology

Background:

  • Trypanosoma brucei undergoes developmental transitions for survival and transmission.
  • Differentiation from mammalian stumpy forms to insect procyclic forms is crucial.

Purpose of the Study:

  • To investigate the irreversibility and commitment point of stumpy-to-procyclic form differentiation.
  • To identify molecular mechanisms underlying this differentiation process.

Main Methods:

  • Induction of synchronous differentiation using cis-aconitate.
  • Use of cycloheximide to assess protein synthesis requirements.
  • Stable isotope labeling by amino acids in cell culture (SILAC) for proteomic and phosphoproteomic analysis.

Main Results:

  • The differentiation transition is an irreversible bistable switch.
  • Commitment to differentiation occurs after a specific exposure period to cis-aconitate.
  • New protein synthesis is essential for establishing signal memory.
  • The 'commitment proteome' was defined, revealing protein and phosphorylation profiles.
  • Nek-related kinase was identified as a key regulator initiating differentiation.

Conclusions:

  • Parasite differentiation involves irreversible commitment points regulated by positive feedback.
  • Nek-related kinase is the first identified protein kinase controlling Trypanosoma brucei differentiation to procyclic forms.