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| Content Provider | Springer Nature Link |
|---|---|
| Author | Li, Zhiqiang Gan, Xiaoni He, Shunping |
| Copyright Year | 2009 |
| Abstract | We investigated the molecular evolution of duplicated color vision genes (LWS-1 and SWS2) within cyprinid fish, focusing on the most cavefish-rich genus—Sinocyclocheilus. Maximum likelihood-based codon substitution approaches were used to analyze the evolution of vision genes. We found that the duplicated color vision genes had unequal evolutionary rates, which may lead to a related function divergence. Divergence of LWS-1 was strongly influenced by positive selection causing an accelerated rate of substitution in the proportion of pocket-forming residues. The SWS2 pigment experienced divergent selection between lineages, and no positively selected site was found. A duplicate copy of LWS-1 of some cyprinine species had become a pseudogene, but all SWS2 sequences remained intact in the regions examined in the cyprinid fishes examined in this study. The pseudogenization events did not occur randomly in the two copies of LWS-1 within Sinocyclocheilus species. Some cave species of Sinocyclocheilus with numerous morphological specializations that seem to be highly adapted for caves, retain both intact copies of color vision genes in their genome. We found some novel amino acid substitutions at key sites, which might represent interesting target sites for future mutagenesis experiments. Our data add to the increasing evidence that duplicate genes experience lower selective constraints and in some cases positive selection following gene duplication. Some of these observations are unexpected and may provide insights into the effect of caves on the evolution of color vision genes in fishes. |
| Starting Page | 346 |
| Ending Page | 359 |
| Page Count | 14 |
| File Format | |
| ISSN | 00222844 |
| Journal | Journal of Molecular Evolution |
| Volume Number | 69 |
| Issue Number | 4 |
| e-ISSN | 14321432 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2009-10-17 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Genome duplication Color vision gene Positive selection Cyprinid fish Cavefish Sinocyclocheilus Animal Genetics and Genomics Plant Genetics & Genomics Plant Sciences Microbiology Evolutionary Biology Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Molecular Biology Ecology, Evolution, Behavior and Systematics |
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