Medakafish Photoreceptors

Japanese


It is suggested that medakafish brain (pineal organ) and melanosites recognize photons as well as the eye.

Medakafish photoreceptor cells in the eye


Section of fry medaka head


The photoreceptor cells of medaka are morphologically distinguishable as principle and accessory members of double cones, long single cones and short single cones. Rods and cones play roles in twilight and daylight vision, respectively. Cone photoreceptors are arranged in a square mosaic pattern.
Each photoreceptor produces a photoreceptor type-specific visual pigment, which have sensitive to photon with different wavelength. It is highly suggestive that there is a mechanism to express only one visual pigment gene and to suppress others.



Photoreceptor cells and visual pigment of medaka



Phototransduction cascade of vertebrates

Proteins participating in phototransduction cascade
  • Visual pigment
  • Visual pigment kinase
  • Arrestin


  • Hisatomi Homepage
  • Medakafish Homepage

    suggestion and comments
    Mail:hisatomi'atmark'ess.sci.osaka-u.ac.jp