Feedback from rhodopsin controls rhodopsin exclusion in Drosophila photoreceptors

Daniel Vasiliauskas, Esteban O. Mazzoni, Simon G. Sprecher, Konstantin Brodetskiy, Robert J. Johnston, Preetmoninder Lidder, Nina Vogt, Arzu Celik, Claude Desplan

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Abstract

Sensory systems with high discriminatory power use 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 ageing adult retina. The Rh6 feedback signal results in repression of the rh5 promoter and can be mimicked by other Drosophila rhodopsins; it is partly dependent on activation of rhodopsin by light, and relies on G Î ±q 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.

Original languageEnglish (US)
Pages (from-to)108-112
Number of pages5
JournalNature
Volume479
Issue number7371
DOIs
StatePublished - Nov 3 2011

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Cite this

Vasiliauskas, D., Mazzoni, E. O., Sprecher, S. G., Brodetskiy, K., Johnston, R. J., Lidder, P., Vogt, N., Celik, A., & Desplan, C. (2011). Feedback from rhodopsin controls rhodopsin exclusion in Drosophila photoreceptors. Nature, 479(7371), 108-112. https://doi.org/10.1038/nature10451