Divergence of shrews (Insectivora, Soricidae) from the data of DNA restriction analysisстатья
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Аннотация:Phylogenetic relationships of 14 species from the genera Sorex, Crocidura and Neomys were examined using a restriction analysis of DNA repetitive sequences. Seven restriction endonucleases were used as follows: Sau96I, Csp6I, HinfI, MspI, Eco130I, TaqI, BcnI. Fragments were enzymatically labelled by P-isotope at the 3'-end and separated by polyacrylamide gel electrophoresis. A number of bands corresponding to the fragments of 30-500 bp long have been revealed. Comparison of electrophoretic patterns has revealed both species-specific, genus-specific and family-specific bands. The Wagner parsimony analysis was conducted in all informative characters with Talpidae family designated as an outgroup. Divergence in So, ex is revealed to be smaller than in Crocidura. The relationships of shrew species obtained from the morphological and karyological data do not correlate properly with molecular divergence. Different level of molecular-genetic differentiation of species in genera Sorex, Crocidura, and Neomys is related probably to the various content of heterochromation in chromosomes. Possible evolutionary interpretation suggests different ways and moments of speciation in these genera.