Reduced muscle contraction and a relaxed posture during sleep-like Lethargus.
Sleep is characterized by reduced muscle activity resulting in reduced movement and a typical posture compatible with relaxed muscles. Prior to each molt, C. elegans larvae go through a phase of behavioral quiescence called Lethargus. Lethargus has sleep-like properties, but a specific posture has not yet been described. Do C. elegans larvae relax their muscles during sleep and do they assume a typical posture? We measured worm posture and body wall muscle activity using calcium imaging across the sleep-wake-like cycle. We found that worms were less curved and had less muscle activity during the sleep-like state. We conclude that during Lethargus, muscle activity is reduced, resulting in a relaxed body posture typical for a sleep-like state.
Max Planck Institute for Biophysical Chemistry; Göttingen, Germany.
Juliane
J
Schwarz
Jan-Philipp
JP
Spies
Henrik
H
Bringmann
GCaMP; Lethargus; calcium; muscle; posture; sleep