A Role for STOML3 in Olfactory Sensory Transduction

Area of Science:

• Neuroscience
• Molecular Biology
• Sensory Biology

Background:

• Stomatin-like protein-3 (STOML3) is an integral membrane protein found in olfactory sensory neurons (OSNs) and dorsal root ganglia neurons.
• STOML3 is known to be essential for touch sensation in dorsal root ganglia neurons, but its function in olfaction is unexplored.

Purpose of the Study:

• To investigate the functional role of STOML3 in the cilia of olfactory sensory neurons (OSNs).
• To determine if STOML3 is involved in modulating odorant responses and sensory encoding in OSNs.

Main Methods:

• Performed loose patch recordings on wild-type (WT) and Stoml3 knock-out (KO) OSNs.
• Analyzed spontaneous and stimulus-evoked firing activity, including interspike intervals (ISIs).
• Conducted control experiments to differentiate between transduction and action potential generation deficits.

Main Results:

• Mice lacking STOML3 exhibited normal olfactory epithelium morphology.
• STOML3 deficiency led to reduced spontaneous mean firing activity and altered ISIs in OSNs.
• Neurons lacking STOML3 showed diminished firing activity (spike number and duration) in response to stimuli.
• Deficits were primarily attributed to impaired transduction, not action potential generation.

Conclusions:

• Stomatin-like protein-3 (STOML3) plays a significant physiological role in olfaction.
• STOML3 is required for normal sensory encoding by olfactory sensory neurons.
• The protein's function appears to be primarily at the transduction level within OSNs.