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Differences in the location of nucleolus organizer regions in European vespertilionid bats


, : Differences in the location of nucleolus organizer regions in European vespertilionid bats. Cytogenetics and Cell Genetics 44(4): 186-197

The karyotypes of European vespertilionid bats are distinguished by only a few, easily detectable differences in their G-banding patterns. Most rearrangements can be identified as Robertsonian translocations. Yet, there are surprising differences in the location of active nucleolus organizer regions (NORs), as revealed by silver staining. The ancestral position of the NOR is considered to be a secondary constriction on chromosome 15, as is the case in the genera Eptesicus, Nyctalus, and Vespertilio and in three of four Pipistrellus species. The remaining genera show multiple NOR sites located on minute short arms close to the centromere. In P. pipistrellus, differences in the location of the NORs correlate with the geographical origin of the animals. Some Myotis species possess NORs on numerous chromosomes and show great interindividual variability. In addition, two sibling species, M. brandtii and M. mystacinus, show completely different NOR locations.

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Accession: 005151368

PMID: 2438093

DOI: 10.1159/000132371

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