Molecular Biology and Evolution 18:2270-2279 (2001)
© 2001 Society for Molecular Biology and Evolution
Functional Diversification of Lepidopteran Opsins Following Gene Duplication
Department of Molecular and Cellular Biology, University of Arizona
A comparative approach was taken for identifying amino acid substitutions that may be under positive Darwinian selection and are correlated with spectral shifts among orthologous and paralogous lepidopteran long wavelength–sensitive (LW) opsins. Four novel LW opsin fragments were isolated, cloned, and sequenced from eye-specific cDNAs from two butterflies, Vanessa cardui (Nymphalidae) and Precis coenia (Nymphalidae), and two moths, Spodoptera exigua (Noctuidae) and Galleria mellonella (Pyralidae). These opsins were sampled because they encode visual pigments having a naturally occurring range of 
max values (510–530 nm), which in combination with previously characterized lepidopteran opsins, provide a complete range of known spectral sensitivities (510–575 nm) among lepidopteran LW opsins. Two recent opsin gene duplication events were found within the papilionid but not within the nymphalid butterfly families through neighbor-joining, maximum parsimony, and maximum likelihood phylogenetic analyses of 13 lepidopteran opsin sequences. An elevated rate of evolution was detected in the red-shifted Papilio Rh3 branch following gene duplication, because of an increase in the amino acid substitution rate in the transmembrane domain of the protein, a region that forms the chromophore-binding pocket of the visual pigment. A maximum likelihood approach was used to estimate 
, the ratio of nonsynonymous to synonymous substitutions per site. Branch-specific tests of selection (free-ratio) identified one branch with = 2.1044, but the small number of substitutions involved was not significantly different from the expected number of changes under the neutral expectation of = 1. Ancestral sequences were reconstructed with a high degree of certainty from these data. Reconstructed ancestral sequences revealed several instances of convergence to the same amino acid between butterfly and vertebrate cone pigments, and between independent branches of the butterfly opsin tree that are correlated with spectral shifts.
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