Abstract
Hedgehogs belong to one of the several mammalian taxa in which karyotype differences are based on variations in heterochromatin content. Furthermore, the number and location of nucleolar organizer regions (NORs) can also vary widely. In the present study these cytogenetic features were investigated in the Algerian hedgehog, Erinaceus (Aethechinus) algirus. The heterochromatin and NOR distribution patterns in the karyotype of this species are new among hedgehogs, whereas the euchromatic regions, including their G-band pattern, are similar to those reported by others. In addition, silver staining revealed a cytogenetic feature exclusive to the heterochromatic blocks of E. algirus: their silver staining with standard cytogenetic procedures. Because no similar phenomenon has been described previously in a mammalian species, several hypotheses about the significance and specificity of silver staining to NOR sites are discussed. Finally, the existence of different types of heterochromatin in the species analysed here, lead us to propose that what hedgehogs have inherited from their common ancestor is a mechanism which permits the accumulation of heterochromatin on specific chromosomes, rather than the heterochromatin itself.
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Acknowledgements
We would like to thank Dr Thelma Slezyger from the Universidad Simon Bolivar (Venezuela) for providing us with the rDNA probes used in this study, and Ms Karen Shashok for revising the English style of the manuscript. This work was supported by the Spanish DGICYT through Project No. PB92-0951.
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Sánchez, A., Jiménez, R., Burgos, M. et al. Cytogenetic peculiarities in the Algerian hedgehog: silver stains not only NORs but also heterochromatic blocks. Heredity 75, 10–16 (1995). https://doi.org/10.1038/hdy.1995.98
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DOI: https://doi.org/10.1038/hdy.1995.98
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