JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Gene switching and the stability of odorant receptor gene choice.

Cell 2004 June 12
Individual olfactory sensory neurons express only a single odorant receptor from a large family of genes, and this singularity is an essential feature in models of olfactory perception. We have devised a genetic strategy to examine the stability of receptor choice. We observe that immature olfactory sensory neurons that express a given odorant receptor can switch receptor expression, albeit at low frequency. Neurons that express a mutant receptor gene switch receptor transcription with significantly greater probability, suggesting that the expression of a functional odorant receptor elicits a feedback signal that terminates switching. This process of receptor gene switching assures that a neuron will ultimately express a functional receptor and that the choice of this receptor will remain stable for the life of the cell.

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