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    Sensing smells of foods, prey, or predators determines animal survival. Olfactory sensory neurons in the olfactory epithelium (OE) detect odorants, where cAMP and Ca2+ play a significant role in transducing odorant inputs to electrical activity. Here we show Anoctamin 9, a cation channel activated by cAMP/PKA pathway, is expressed in the OE and amplifies olfactory signals. Ano9-deficient mice had reduced olfactory behavioral sensitivity, electro-olfactogram signals, and neural activity in the olfactory bulb. In line with the difference in olfaction between birds and other vertebrates, chick ANO9 failed to respond to odorants, whereas chick CNGA2, a major transduction channel, showed greater responses to cAMP. Thus, we concluded that the signal amplification by ANO9 is important for mammalian olfactory transduction. Copyright © 2022. Published by Elsevier Ltd.


    Hyungsup Kim, Hyesu Kim, Luan Thien Nguyen, Taewoong Ha, Sujin Lim, Kyungmin Kim, Soon Ho Kim, Kyungreem Han, Seung Jae Hyeon, Hoon Ryu, Yong Soo Park, Sang Hyun Kim, In-Beom Kim, Gyu-Sang Hong, Seung Eun Lee, Yunsook Choi, Lawrence B Cohen, Uhtaek Oh. Amplification of olfactory signals by Anoctamin 9 is important for mammalian olfaction. Progress in neurobiology. 2022 Dec;219:102369

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    PMID: 36330924

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