Journal
SCIENCE
Volume 311, Issue 5767, Pages 1617-1621Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1123802
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Funding
- NEI NIH HHS [R01 EY006837-19, R01 EY006837, R01 EY006837-18, R37 EY006837, R01 EY014596-02, R01 EY006837-17, R01 EY014596-03, R37 EY006837-15S1, R01 EY014596-01, EY06837, R01 EY006837-16A1, R01 EY014596-04, R01 EY014596] Funding Source: Medline
- NIDCD NIH HHS [R01 DC006904-01, R01 DC006904, R01 DC006904-02] Funding Source: Medline
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The parietal-eye photoreceptor is unique because it has two antagonistic light signaling pathways in the same cell - a hyperpolarizing pathway maximally sensitive to blue light and a depolarizing pathway maximally sensitive to green light. Here, we report the molecular components of these two pathways. We found two opsins in the same cell: the blue-sensitive pinopsin and a previously unidentified green-sensitive opsin, which we name parietopsin. Signaling components included gustducin-alpha and G alpha(o), but not rod or cone transducin-alpha. Single-cell recordings demonstrated that G(o) mediates the depolarizing response. Gustducin-alpha resembles transducin-alpha functionally and likely mediates the hyperpolarizing response. The parietopsin-G(o) signaling pair provides clues about how rod and cone phototransduction might have evolved.
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