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Molecular basis for color vision

T Yoshizawa1

  • 1Department of Information Systems Engineering, Faculty of Engineering, Osaka Sangyo University, Japan.

Biophysical Chemistry
|May 1, 1994
PubMed
Summary
This summary is machine-generated.

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Chicken and gecko visual pigments reveal cone pigments evolved before rod pigments, suggesting daylight and color vision preceded twilight vision. This evolution involved changes in amino acid sequences and properties.

Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Vision science

Background:

  • Visual pigments are crucial for light detection and form the basis of vision.
  • Understanding the evolutionary relationships between different types of visual pigments can shed light on the evolution of vision itself.

Purpose of the Study:

  • To determine the amino acid sequences of chicken cone pigments and gecko visual pigments.
  • To investigate the evolutionary history of cone and rod pigments.
  • To compare the functional properties of cone and rod pigments.

Main Methods:

  • Amino acid sequencing of chicken cone pigments and gecko visual pigments.
  • Phylogenetic analysis to construct a visual pigment evolutionary tree.
  • Net charge calculations to analyze amino acid residue changes.

Related Experiment Videos

  • Comparison of regeneration rates, meta II-intermediate formation, and meta II-intermediate lifetime between cone and rod pigments.

    • Main Results:

    • Gecko pigments were identified as cone pigments based on amino acid sequence identity.
    • Phylogenetic analysis indicated cone pigments evolved earlier than rod pigments (rhodopsins).
    • Amino acid sequence divergence between cone and rod pigments involves shifts from basic to acidic residues.
    • Chicken cone pigments exhibit faster regeneration, meta II-intermediate formation, and shorter meta II-intermediate lifetime compared to rhodopsin.

    Conclusions:

    • Daylight and color vision likely evolved before twilight vision.
    • Differences in pigment properties explain the functional distinctions between cones and rods (e.g., rapid dark adaptation, light response, and photosensitivity).
    • Chicken tetrachromatic vision is supported by the absorption spectra of its cone pigments and oil droplet filtering effects.