Regulation of the ciliary rhythm in Platynereis larvae across time scales

Rhythms@Sea Symposium, SZN
Nov 6, 2023

Gáspár Jékely

Centre for Organismal Studies, Heidelberg University

@jekely@biologists.social

Platynereis dumerilii







  • breeding culture, full life-cycle
  • embryos daily, year round
  • genome sequence
  • microinjection, transgenesis
  • neuron-specific promoters and antibodies
  • knock-out lines
  • neuronal connectome
  • whole-body neuronal activity imaging
  • whole-animal pharmacology by bath application 😎

Ciliary rhythm at the millisecond scale - metachronal waves



Ciliary rhythm at the minute scale - ciliary arrests

Whole-body coordination of ciliary arrests

Ciliary rhythm at the circadian scale - day/night regulation of arrests




Ciliary arrests are modulated by many neuromodulators

Whole-body vEM reconstruction of a 3d Platynereis larva

Ciliomotor neurons

24 ciliomotor neurons

Serotonergic neurons activate cilia

Ser-h1 neurons, EM reconstruction

Cholinergic neurons induce ciliary arrests

Cholinergic Loop neurons, EM reconstruction

Ciliary beating increases under pressure

Pressure is sensed by photoreceptors with ramified cilia

Circuitry of ciliary photoreceptors

Myoinhibitory peptide increases closures during settlement

Mushroom body inputs to the ciliomotor system

Acknowledgements

  • Emelie Brodrick
  • Cyrielle Kaltenrieder
  • Réza Shahidi
  • Milena Marinkovic
  • Daniel Thiel
  • Sanja Jasek
  • Cameron Hird
  • Rebecca Turner
  • Luis A. Bezares-Calderón
  • Kei Jokura
  • Luis Yanez Guerra
  • Alexandra Kerbl

Former lab members

  • Albina Asadulina
  • James Beard
  • Markus Conzelmann
  • Nadine Randel
  • Philipp Bauknecht
  • Martin Gühmann
  • Cristina Pineiro-Lopez
  • Nobuo Ueda
  • Aurora Panzera
  • Csaba Verasztó
  • Elizabeth Williams