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Related Experiment Videos

Evolution of visual pigments in geckos.

Y Taniguchi1, O Hisatomi, M Yoshida

  • 1Department of Earth and Space Science, Graduate School of Science, Osaka University, Japan.

FEBS Letters
|March 9, 1999
PubMed
Summary

Diurnal geckos evolved cone retinas from ancestral rod retinas, supported by molecular evidence of closely related opsins. This suggests a reverse transmutation, with accelerated evolution in diurnal gecko opsins possibly driven by behavioral changes.

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Area of Science:

  • Evolutionary biology
  • Molecular genetics
  • Comparative genomics

Background:

  • Most geckos are nocturnal with rod retinas, but some diurnal species possess pure-cone retinas.
  • Photoreceptor evolution in geckos presents a unique model for studying visual system adaptations.

Purpose of the Study:

  • To isolate and characterize cDNAs encoding diurnal gecko opsins.
  • To investigate the evolutionary relationship between diurnal and nocturnal gecko opsins.
  • To provide molecular evidence for the evolutionary transition of photoreceptor types in geckos.

Main Methods:

  • Isolation of complementary DNAs (cDNAs) encoding diurnal gecko opsins (dg1 and dg2).
  • Phylogenetic analysis of opsin sequences from diurnal and nocturnal geckos.
  • Comparison of amino acid substitution rates between different gecko opsin types.

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Main Results:

  • cDNAs for diurnal gecko opsins, dg1 and dg2, were successfully isolated, showing similarity to nocturnal gecko opsins P521 and P467.
  • Phylogenetic analysis revealed that diurnal and nocturnal gecko opsins are closely related despite morphological differences in photoreceptor types.
  • Amino acid substitution rates were higher in diurnal gecko opsins (dg1, dg2) compared to their nocturnal counterparts (P521, P467).

Conclusions:

  • The study provides molecular evidence supporting the hypothesis of reverse transmutation, where ancestral gecko rods transformed into diurnal cones.
  • Accelerated amino acid substitutions in diurnal gecko opsins may be linked to behavioral adaptations to different photic environments.
  • These findings offer insights into the genetic mechanisms underlying visual system evolution in vertebrates.