Grétarsdóttir S, Arnason U
Department of Molecular Genetics, University of Lund, Sweden.
Mol Biol Evol. 1993 Mar;10(2):306-18. doi: 10.1093/oxfordjournals.molbev.a040006.
In the sperm whale (Physeter macrocephalus) two different repeat types (A and B) of the common cetacean DNA satellite were identified. The evolution of each group of repeats appears to be independent from that of the other. The sequence similarity between the two groups is less than the similarity between group A and repeats of the satellite in related whale species. The systematic relationship within and between the families Physeteridae (sperm whales) and Ziphiidae (beaked whales) was addressed by both sequence analysis of the satellite and comparisons with the families Delphinidae and Phocoenidae. The mysticete blue whale (Balaenoptera musculus) was used as an outgroup in the comparisons. The molecular phylogeny, when maximum-parsimony analysis and the neighbor-joining method were used, grouped together species of each family. At the family level the ziphiids grouped closet to the families Phocoenidae and Delphinidae. The similarities between the common cetacean satellite of the blue whale and the sperm whale were greater than those between the blue whale and the other odontocetes included, suggesting that the evolution of the satellite is slower in the sperm whale than in the other odontocetes.
在抹香鲸（Physeter macrocephalus）中，鉴定出了常见鲸类DNA卫星的两种不同重复类型（A和B）。每组重复序列的进化似乎独立于另一组。两组之间的序列相似性低于A组与相关鲸类物种中卫星重复序列之间的相似性。通过对卫星的序列分析以及与海豚科和鼠海豚科的比较，探讨了抹香鲸科（抹香鲸）和喙鲸科（喙鲸）科内及科间的系统关系。在比较中，须鲸蓝鲸（Balaenoptera musculus）被用作外类群。当使用最大简约分析和邻接法时，分子系统发育将每个科的物种归为一类。在科级水平上，喙鲸科与鼠海豚科和海豚科的关系最为密切。蓝鲸和抹香鲸的常见鲸类卫星之间的相似性大于蓝鲸与其他齿鲸之间的相似性，这表明抹香鲸中卫星的进化比其他齿鲸慢。
