単一の光受容体は,共伝送によって知覚と誘導を分割する
Na Xiao1,2,3,4,5, Shuang Xu1,2,3,4, Ze-Kai Li1,2,3,4
1State Key Laboratory of Membrane Biology, School of Life Sciences, Peking University, Beijing, China.
Nature
|October 25, 2023
まとめ
フルーツ・フライは 光受容体の一種を使って 画像形成の視覚と 昼夜間の光の誘導を処理します この光受容体は ヒスタミンとアセチルコリンを共伝達し 異なる行動のための視覚信号を分離します
科学分野:
- 神経科学
- 感覚生物学
- クロノバイオロジー
背景:
- 視力には異なる機能があります 画像知覚 (コントラストベース) と昼夜照射 (放射性ベース) です
- 特殊な光受容体は存在しますが 画像を形成する光受容体は昼夜リズムに影響を与えます
- これらの信号タイプを光受容体内で分離するメカニズムは不明である.
研究 の 目的:
- 光受容体が画像形成と放射線信号を分離する方法を調査する.
- ドロソフィラのシグナル分離の背後にある分子メカニズムを解明する.
- 光受容体の機能と 異なる視覚的行動を 結びつけるために
主な方法:
- ドロソフィラR8光受容体における神経伝達物質の共伝達を研究した.
- ポストシナプス受容体発現と神経経路の分析
- 神経伝達物質の伝達障害による行動への影響を調べた.
主要な成果:
- ドロソフィラR8光受容体はヒスタミンとアセチルコリンを共伝達し,信号を分離する.
- ヒスタミンとアセチルコリン受容体は,異なる下流ニューロンで信号分離を媒介する.
- ヒスタミンは光照射中にアセチルコリン伝達を維持するオトクリンフィードバックを提供します.
- ヒスタミンとアセチルコリンの伝達を妨害すると 動きの検出と昼間の流れが損なわれます
結論:
- 単一の光受容体型は 異なる行動出力の 視覚情報の分離を開始します
- この初期のシナプス分離は,コントラストと放射線信号の並列処理を可能にします.
- この発見は 感覚を様々な行動に変換する 基本的なメカニズムを明らかにしています
関連する概念動画
Photoreceptors and Visual Pathways
6.1K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
6.1K
The Retina
69.1K
The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
69.1K
Anatomy of the Eyeball
7.2K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
7.2K
Vision
53.5K
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
53.5K
Channel Rhodopsins
2.6K
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
2.6K
Photoreceptors and Plant Responses to Light
20.4K
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
20.4K


