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Study on olfactory function in GABAC receptor/channel rho1 subunit knockout mice.

Yan Chen¹, Dongping Zhou, Kun Zhou

¹Department of Medical Genetics, Shanghai Jiaotong University School of Medicine, 280 Chongqing Nan Rd., Shanghai 200025, PR China.

Neuroscience Letters

|October 10, 2007

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Mice lacking the GABAC receptor rho1 subunit showed altered olfactory function. These mice exhibited increased sensitivity to citral odorants, indicating the rho1 subunit modulates olfactory signaling.

Area of Science:

Neuroscience
Molecular Biology
Sensory Physiology

Background:

The GABAC receptor/channel rho1 subunit is crucial for inhibitory pathways and sensory processing.
Its specific role in olfactory sensory function remains unclear despite suggestions of involvement.

Purpose of the Study:

To investigate the precise role of the rho1 subunit in olfactory sensory function.
To characterize olfactory alterations in mice lacking the rho1 subunit.

Main Methods:

Reverse transcription (RT)-PCR to detect rho1 subunit mRNA expression in the olfactory bulb.
Immunohistochemistry to detect rho1 subunit protein expression in olfactory bulb neurons.
Olfactory behavioral tests to assess olfactory function in knockout and wild-type mice.

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Last Updated: Jul 11, 2026

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Main Results:

Rho1 subunit mRNA and protein were expressed in the olfactory bulb of wild-type mice, specifically in mitral cells.
Neither mRNA nor protein was detected in the olfactory bulbs of rho1 subunit knockout (rho1-/-) mice.
Rho1-/- mice displayed significantly greater sensitivity to citral odorants compared to wild-type littermates.

Conclusions:

The GABAC rho1 subunit is expressed in olfactory bulb neurons.
The rho1 subunit functions as an inhibitory modulator in the olfactory bulb.
It plays a significant role in regulating olfactory signaling transmission and sensory perception.