Vibrissa sensory neurons: Linking distinct morphology to specific physiology and function

Area of Science:

• Neuroscience
• Sensory Biology
• Mammalian Physiology

Background:

• Rodents utilize facial vibrissae (whiskers) as crucial tactile sensors for object localization and discrimination.
• Vibrissae are innervated by diverse trigeminal (TG) sensory neurons, categorized morphologically (≥6 types) and electrophysiologically (rapidly adapting [RA] and slowly adapting [SA]).
• A significant knowledge gap exists in correlating specific vibrissa neuron morphologies with their precise physiological roles and functions.

Purpose of the Study:

• To bridge the gap between morphological classification and functional understanding of vibrissa sensory neurons.
• To elucidate the physiological properties and functional significance of different vibrissa-innervating neuron types.
• To advance the understanding of the rodent vibrissa sensory system.

Main Methods:

• Review of recent advancements in vibrissa sensory system research.
• Application of single-cell transcriptome profiling to characterize neuron subtypes.
• Utilizing optogenetics-assisted in vivo electrophysiology to correlate neural activity with behavior.

Main Results:

• Identification of distinct molecular profiles for different vibrissa neuron populations.
• Correlation of specific neuronal response patterns (RA/SA) with distinct sensory inputs during whisking and touch.
• Demonstration of functional specialization among vibrissa sensory neurons.

Conclusions:

• Single-cell transcriptomics and optogenetics-assisted electrophysiology are powerful tools for dissecting the vibrissa sensory system.
• These integrated approaches can resolve the long-standing challenge of linking vibrissa neuron morphology to function.
• A comprehensive understanding of vibrissa sensory pathways is crucial for fields ranging from neuroscience to robotics.