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Arrestins expressed in killifish photoreceptor cells
O Hisatomi1, Y Imanishi, T Satoh
1Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Japan.
FEBS Letters
|July 7, 1997
Summary
Two killifish arrestin variants, KfhArr-R and KfhArr-C, were identified and localized to rod and cone cells, respectively. Their evolutionary divergence predates teleost-tetrapod split, suggesting conserved visual arrestin evolution.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Vision Science
Background:
- Arrestins are crucial regulators of G protein-coupled receptor signaling, particularly in phototransduction.
- Vertebrate visual arrestins play distinct roles in rod and cone photoreceptor function.
Purpose of the Study:
- To isolate and characterize killifish arrestin cDNAs.
- To determine the expression patterns of these arrestins in killifish photoreceptor cells.
- To investigate the evolutionary history of vertebrate visual arrestins.
Main Methods:
- Complementary DNA (cDNA) fragment isolation.
- In situ hybridization for transcript localization.
- Deduced amino acid sequence analysis.
- Phylogenetic analysis of arrestin sequences.
Main Results:
- Two killifish arrestin cDNAs, KfhArr-R and KfhArr-C, were isolated.
- KfhArr-R transcripts were found in rod cells, while KfhArr-C transcripts were in cone cells.
- Sequence analysis revealed homology to human rod and cone arrestins.
- Phylogenetic analysis indicated that visual arrestins form a distinct cluster, diverging into rod and cone subtypes before the teleost-tetrapod split.
Conclusions:
- Killifish possess distinct rod and cone arrestins, analogous to other vertebrates.
- The evolutionary divergence of visual arrestins occurred early in vertebrate evolution.
- The findings support a conserved mechanism of phototransduction regulation across vertebrates.