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Molecular Biology and Evolution, Vol 10, 527-538, Copyright © 1993 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Paralogous origin of the red- and green-sensitive visual pigment genes in vertebrates

S Yokoyama, WT Starmer and R Yokoyama
Department of Biology, Syracuse University, New York 13244.

The nucleotide sequence of the red-sensitive visual pigment gene, R007Af, in the fish Astyanax fasciatus, from the initiation codon to the stop codon of this gene, including introns, is 1,592 bp, making it the shortest visual pigment gene known in vertebrates. Analysis of this and other homologous sequence data suggests that vertebrates initially had two duplicate genes and that each ancestor of Astyanax, human, and chicken independently duplicated the gene in the process of developing their red-green color vision. Furthermore, many extant red-green colorblind organisms may be explained simply by the failure of achieving very specific nucleotide substitutions at the three codon positions 180, 277, and 285, rather than by the lack of duplicate loci.
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