Molecular Biology and Evolution, Vol 11, 32-39, Copyright © 1994 by Society for Molecular Biology and Evolution
S Yokoyama
When invertebrate rhodopsins were used as the outgroup, the rooted
phylogenetic tree of 26 vertebrate visual pigments (VPs) was constructed.
These VPs are distinguished into the following four clusters: (1) RH1
cluster consisting of rhodopsins, (2) RH2 cluster consisting of VPs with
variable ranges of absorption spectra, (3) SWS cluster of short
wavelength-sensitive VPs, and (4) LWS/MSW cluster of long and medium
wavelength-sensitive VPs. Short wavelength-sensitive VPs from Astyanax
fasciatus (AF23), goldfish (BCa), chicken (BCg and VGg), and human (BHs)
belong to SWS cluster, whereas that from gecko (BGge) belongs to the RH2
cluster. The SWS cluster is further divided into SWS-I (BHs and VGg) and
SWS-II (AF23, BCa, and BGg) groups. The SWS-I group has accumulated more
amino acid changes than any other group of VPs. It is suggested that amino
acid changes at a few key positions might have been important in the
functional differentiation of the SWS-I group from the SWS-II group.
ORIGINAL ARTICLE
Gene duplications and evolution of the short wavelength-sensitive visual pigments in vertebrates
Department of Biology, Syracuse University, New York 13214.
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