Feeling force: physical and physiological principles enabling sensory mechanotransduction.

Area of Science:

• Mechanobiology
• Cellular mechanics
• Sensory neuroscience

Background:

• Organisms across kingdoms detect and respond to physical forces.
• In animals, specialized mechanoreceptor cells use ionotropic force receptors, or mechanoelectrical transduction (MeT) channels, for sensory functions like hearing and touch.
• These channels are critical for organ function and proprioception.

Purpose of the Study:

• To integrate knowledge of mechanoreceptor cell architecture and mechanics with principles of mechanical filtering by surrounding tissues.
• To advance the identification of proteins forming MeT channels and elucidate their gating mechanisms.
• To explore the evolutionary emergence of MeT channel proteins.

Main Methods:

• Comparative analysis of sensory mechanobiology across model organisms (nematodes, fruit flies, mice).
• Integration of structural and mechanical principles of mechanoreceptor cells.
• Investigation of the role of engulfing tissues in mechanical filtering.

Main Results:

• Mechanoreceptor cells exhibit asymmetric responses to force, potentially due to structural and mechanical anisotropy.
• Progress has been made in identifying MeT channel proteins and understanding their gating.
• MeT channel proteins appear to have evolved independently multiple times across different lineages.

Conclusions:

• Understanding mechanoreceptor cell mechanics and architecture is key to deciphering sensory transduction.
• The evolution of mechanoelectrical transduction channels is a recurring theme across diverse life forms.
• Further research into MeT channel proteins and their gating mechanisms will illuminate fundamental biological processes.