Taberlet Pierre, Fumagalli Luca, Hausser Jacques
Laboratoire de Biologie des Populations d'Altitude, CNRS EP55, Université Joseph Fourier, BP 53, 38041, Grenoble Cedex 9, France.
Institut de Zoologie et d'Ecologie Animale, Université de Lausanne, Bâtiment de Biologie, 1015, Lausanne, Switzerland.
Evolution. 1994 Jun;48(3):623-636. doi: 10.1111/j.1558-5646.1994.tb01349.x.
The shrews of the Sorex araneus group have undergone a spectacular chromosome evolution. The karyotype of Sorex granarius is generally considered ancestral to those of Sorex coronatus and S. araneus. However, a sequence of 777 base pairs of the cytochrome b gene of the mitochondrial DNA (mtDNA) produces a quite different picture: S. granarius is closely related to the populations of S. araneus from the Pyrenees and from the northwestern Alps, whereas S. coronatus and S. araneus from Italy and the southern Alps represent two well-separated lineages. It is suggested that mtDNA and chromosomal evolution are in this case largely independant processes. Whereas mtDNA haplotypes are closely linked to the geographical history of the populations, chromosomal mutations were probably transmitted from one population to another. Available data suggest that the impressive chromosome polymorphism of this group is quite a recent phenomenon.
普通鼩鼱属的鼩鼱经历了惊人的染色体进化。谷物鼩鼱的核型通常被认为是冠鼩鼱和普通鼩鼱核型的祖先。然而，线粒体DNA（mtDNA）细胞色素b基因的一段777个碱基对的序列却呈现出截然不同的情况：谷物鼩鼱与来自比利牛斯山脉和阿尔卑斯山西北部的普通鼩鼱种群密切相关，而来自意大利和阿尔卑斯山南部的冠鼩鼱和普通鼩鼱则代表两个截然不同的谱系。有人认为，在这种情况下，mtDNA和染色体进化在很大程度上是独立的过程。mtDNA单倍型与种群的地理历史密切相关，而染色体突变可能是从一个种群传播到另一个种群。现有数据表明，该类群令人印象深刻的染色体多态性是一个相当新的现象。
