Abstract
The genus of subterranean rodentsCtenomys presents the widest range of variability in diploid number among mammals (from2n=10 to2n=70). In Uruguay, this variability is observed in karyotypes with2n=44, 50 or 58 and two geographically isolated populations with 70 chromosomes but different karyotypic structure. The last three populations were analyzed in the present study. They present a satellite DNA, which was isolated from genomic DNA afterAlul digestion.In situ hybridization showed that this satellite DNA is located in the centromeric region of a few chromosomes, coincident with Hoechst 33258 staining and C-banding patterns. A similar satellite DNA was detected in Argentinian species of this genus. We established that, in spite of differences in number of positive heterochromatic blocks per karyotype, the C value is the same in the three populations studied. The nature and possible evolutionary path of this repeated DNA is discussed.
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Novello, A., Cortinas, M.N., Suárez, M. et al. Cytogenetic and molecular analysis of the satellite DNA of the genusCtenomys (Rodentia Octodontidae) from Uruguay. Chromosome Res 4, 335–339 (1996). https://doi.org/10.1007/BF02257268
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DOI: https://doi.org/10.1007/BF02257268