Abstract
Constitutive heterochromatin of a karyotypically conserved species of harvest mouse was compared to that of three karyotypically derived species of harvest mice by examining banding patterns produced on metaphase chromosomes with three restriction endonucleases (EcoRI, MboI and PstI). Banding patterns produced by two of these restriction endonucleases (EcoRI and MboI) were compared to published G- and C-banded karyotypes and in situ hybridization of a satellite DNA repeat for these taxa. The third restriction endonuclease (PstI) did not produce a detectable pattern of digestion. For the most part, patterns produced by EcoRI and MboI can be related to C-banded chromosomes and in situ hybridization of satellite DNA sequences. Moreover, digestion with EcoRI reveals bands not apparent with these other techniques, suggesting that restriction endonuclease digestion of metaphase chromosomes may provide additional insight into the structure and organization of metaphase chromosomes. The patterns produced by restriction endonuclease digestion are compatible with the chromosomal evolution of these taxa, documenting that in the highly derived taxa not only are the chromosomes rearranged but the abundance of certain sequences is highly variable. However, technical variation and difficulty in producing consistent results even on a single slide with some restriction endonucleases documents the problems associated with this method.
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Van Den Bussche, R.A., Honeycutt, R.L. & Baker, R.J. Restriction endonuclease digestion patterns of harvest mice (Reithrodontomys) chromosomes: a comparison to G-bands, C-bands, and in situ hybridization. Genetica 87, 141–149 (1993). https://doi.org/10.1007/BF00240553
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DOI: https://doi.org/10.1007/BF00240553