Reprogramming chemotaxis responses: sensory neurons define olfactory preferences in C. elegans

Area of Science:

• Neuroscience
• Behavioral Biology
• Genetics

Background:

• Olfactory cues trigger diverse behaviors like attraction and avoidance.
• In C. elegans, olfactory neurons express various odorant receptors.
• The neuron or receptor type may dictate behavioral responses to odors.

Purpose of the Study:

• To investigate whether the olfactory receptor or the expressing neuron specifies behavioral responses to odorants.
• To determine the role of sensory neuron expression in olfactory perception.

Main Methods:

• Utilized transgenic C. elegans expressing the diacetyl receptor (ODR-10) in different olfactory neurons (AWA and AWB).
• Observed behavioral responses to attractive (diacetyl) and repulsive (2-nonanone) odorants.
• Analyzed responses in animals with ODR-10 expressed in AWB, AWA, or both.

Main Results:

• Expressing ODR-10 in AWB neurons caused avoidance of diacetyl, normally an attractive odorant.
• Responses to other odorants remained largely normal.
• Simultaneous expression of ODR-10 in both AWA and AWB neurons led to defective diacetyl responses.

Conclusions:

• The specific sensory neuron expressing an odorant receptor molecule defines the animal's odor preference.
• Olfactory perception and subsequent behavior are determined by the localization of odorant receptor expression within the nervous system.