Abstract
The two closely related species Apodemus sylvaticus and Apodemus flavicollis (Muridae) differ in the distribution of their heterochromatin. Two major repetitive sequences known to occur in both species were isolated from A. flavicollis after digestion of total nuclear DNA with the restriction enzymes HindIII and EcoRI respectively and characterized in both species by filter hybridisation and in situ hybridisation to metaphase chromosomes. The EcoRI clone detects a dispersed repetitive sequence family in the genome of both species. Southern blot hybridisation with the HindIII satellite DNA probe reveals major similarities and minor differences in the two species. In situ hybridisation with the HindIII probe labels all chromosomes of A. flavicollis exclusively in the centromeric heterochromatin, whereas in A. sylvaticus several autosomes are also labelled distally. The labelling patterns correspond to the distribution of heterochromatin in the two species. It is concluded that the additional distal heterochromatin of A. sylvaticus contains similar sequences to those of the centromeric heterochromatin of both species. The distal heterochromatin in A. sylvaticus most likely evolved by transposition and amplification of centromeric satellite DNA elements, after the separation of the two species.
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Hirning, U., Schulz, W.A., Just, W. et al. A comparative study of the heterochromatin of Apodemus sylvaticus and Apodemus flavicollis . Chromosoma 98, 450–455 (1989). https://doi.org/10.1007/BF00292791
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DOI: https://doi.org/10.1007/BF00292791