A Conserved Role for Stomatin Domain Genes in Olfactory Behavior

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• The stomatin domain is a highly conserved protein motif found across all life forms.
• Stomatin domain genes are involved in various animal functions, including kidney, red blood cell, and neuron function, with mechanisms often unclear.
• The Caenorhabditis elegans gene mec-2 and its mouse homolog Stoml3 are known to be essential for mechanosensory neuron function.

Purpose of the Study:

• To investigate the role of stomatin domain genes, specifically mec-2 and Stoml3, in olfactory behavior.
• To determine if mec-2 and Stoml3 share conserved functions in olfaction, similar to their roles in mechanosensation.

Main Methods:

• Examined the expression of stomatin domain genes in C. elegans olfactory neurons.
• Assessed the requirement of mec-2 for olfactory behavior in worms.
• Generated a Stoml3 knock-out (KO) mouse model.
• Evaluated olfactory detection and discrimination abilities in Stoml3 KO mice.

Main Results:

• A subset of stomatin domain genes are expressed in C. elegans olfactory neurons, with mec-2 being essential for olfactory behavior.
• mec-2 functions cell-autonomously, and its alternatively spliced isoforms are interchangeable.
• Stoml3 KO mice exhibit impaired olfactory discrimination but not odor detection.
• mec-2 and Stoml3 share a conserved role in olfactory behavior.

Conclusions:

• MEC-2 and Stoml3 play conserved roles in olfactory behavior across species.
• These proteins are critical for the ability to discriminate between odors, not just detect them.
• The findings expand the known functions of stomatin domain proteins to include olfaction, alongside mechanosensation.