Feedback from rhodopsin controls rhodopsin exclusion in Drosophila photoreceptors.
Feedback from rhodopsin controls rhodopsin exclusion in Drosophila photoreceptors.
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DOI:
10.1038/nature10451
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发表时间:
2011-10-09
期刊:
影响因子:
64.8
通讯作者:
Desplan, Claude
中科院分区:
文献类型:
--
作者:
Vasiliauskas, Daniel;Mazzoni, Esteban O.;Sprecher, Simon G.;Brodetskiy, Konstantin;Johnston, Robert J., Jr.;Lidder, Preetmoninder;Vogt, Nina;Celik, Arzu;Desplan, Claude
Sensory systems with high discriminatory power employ neurons that express only one of several alternative sensory receptor proteins. This exclusive receptor gene expression restricts the sensitivity spectrum of neurons and is coordinated with the choice of their synaptic targets. However, little is known about how it is maintained throughout the life of a neuron. Here we show that the green-light sensing receptor Rhodopsin 6 (Rh6) acts to exclude an alternative blue-sensitive Rhodopsin 5 (Rh5) from a subset of Drosophila R8 photoreceptor neurons. Loss of Rh6 leads to a gradual expansion of Rh5 expression into all R8 photoreceptors of the aging adult retina. The Rh6 feedback signal results in repression of the rh5 promoter and can be mimicked by other Drosophila Rhodopsins; it is partially dependent on activation of Rhodopsin by light, and relies on Gαq activity, but not on the subsequent steps of the phototransduction cascade. Our observations reveal a thus far unappreciated spectral plasticity of R8 photoreceptors, and identify Rhodopsin feedback as an exclusion mechanism.
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