明暗順応下におけるウグイ網膜視細胞の配列変動(橋本葉子教授退任記念論文集)

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In certain species of teleost fish, the retinal cone photoreceptors are tangentially positioned in mosaic patterns. It is possible that this mosaic arrangement is fixed. However, in recent years, it has been reported that these patterns may change in ways that depend on the light environment and on circadian rhythms. Given these notions, the degree of plasticity in the cone row arrangement has been an unresolved issue. We investigated whether or not the pattern of cone distribution changes with the photic environment. For this purpose, we used the retina of dace (Tribolodon hakonensis), to take advantage of its the ventral retina, a regular radial row mosaic pattern centering around the optic papilla was observed. A change in this pattern due to the light environment was not observed. Different results were obtained in the central and dorsal areas of the retina: while a row mosaic pattern was not observed under dark adaptation, a short row mosaic arrangement formed in the dorsal retina under light adaptation. In area of the retina that lack regular mosaic pattern, triple cones and quadruple cones are abundant. Since a triple cone consists of 1 red-sensitive cone and 2 green-sensitive cones, and a quadruple cone consists of 1 red-sensitive cone and 3 green-sensitive cones, the distribution density of green-sensitive cones may be considered high in the central area of the retina. It is suggested that the transmission of color information differs in different regions across the retina.
東京女子医科大学の論文
1997-05-25

明暗順応下におけるウグイ網膜視細胞の配列変動(橋本葉子教授退任記念論文集)

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