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Related Experiment Videos

Goldfish cones secrete a two-repeat interphotoreceptor retinoid-binding protein

B B Wagenhorst1, R R Rajendran, E E Van Niel

  • 1Department of Opthalmology, University of Virginia Health Sciences Center, Charlottesville 22908, USA.

Journal of Molecular Evolution
|November 1, 1995
PubMed
Summary

Interphotoreceptor retinoid-binding protein (IRBP) in fish has two repeats, unlike mammals and amphibians. This simpler structure in teleost fish suggests evolutionary loss or duplication of IRBP gene repeats.

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Ophthalmology

Background:

  • Vitamin A and fatty acids are essential for photoreceptor health.
  • Interphotoreceptor retinoid-binding protein (IRBP) facilitates nutrient transport between retinal layers.
  • Mammalian and amphibian IRBP are large glycoproteins with multiple homologous repeats.

Purpose of the Study:

  • To investigate the structure and evolutionary origin of IRBP in teleost fish.
  • To compare teleost IRBP with that of higher vertebrates.

Main Methods:

  • Western blot analysis to determine protein size.
  • Metabolic labeling with Brefeldin A to study secretion.
  • In situ hybridization to identify the source of IRBP.
  • Amino acid sequence analysis to assess homology.

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Main Results:

  • Goldfish IRBP is approximately 70 kDa, half the size of human IRBP.
  • Goldfish IRBP is secreted by cone photoreceptors.
  • Teleost IRBP possesses only two homologous repeats, differing from higher vertebrates.
  • High similarity exists between the repeats of human and goldfish IRBP, particularly in hydrophobic regions.

Conclusions:

  • Teleost IRBP evolved a simpler, two-repeat structure compared to other vertebrates.
  • This simplification may be due to the loss of two repeats during ray-finned fish evolution or gene duplication events.
  • The evolution of multirepeat IRBP in higher vertebrates likely enhanced hydrophobic molecule transport for photoreceptor function.