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1 Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Tokyo 113-0032, Japan; PRESTO, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan. 2 Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Tokyo 113-0032, Japan. 3 Center for Animal Resources and Development, Kumamoto University, Kumamoto 862-0976, Japan. 4 Laboratory for Neurobiology of Synapse, RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan. 5 Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Tokyo 113-0032, Japan; CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan.
* To whom correspondence should be addressed. E-mail: sakano{at}mail.ecc.u-tokyo.ac.jp.
In the mouse olfactory system, each olfactory sensory neuron(OSN) expresses only one odorant receptor (OR) gene in a mono-allelicand mutually exclusive manner. Such expression forms the geneticbasis for OR-instructed axonal projection of OSNs to the olfactorybulb (OB) of the brain during development. Here, we identifyan upstream cis-acting DNA region that activates the OR genecluster in mouse and allows the expression of only one OR genewithin the cluster. Deletion of the coding region of the expressedOR gene or a frame-shift mutation in that gene allows a secondOR gene to be expressed. We propose that stochastic activationof only one OR gene within the cluster and negative feedbackregulation by that OR gene product are necessary to ensure theone receptor-one neuron rule.
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