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Nucleic Acids Research, 1978, Vol. 5, No. 10 3589-3602
© 1978

Articles

Localisation of foldback DNA sequences in nuclei and chromosomes of Scilla, Secale, and of mouse

Barbara Dewnling

Department of Biology, Division of Cell Biology, University of Kaiserslautern Postfach 3049, D-6750 Kaiserslautern, GFR

Received July 3, 1978. Foldback DNA, prepared from mouse and Scilla sibirica main band DNA, and from rye (Secale cereale) total DNA, was characterised by denaturation, renaturation, and electron microscopy. 3H-cRNA of this DNA was hybridised in situ to nuclei and chromosomes of the respective species.

There is no universal labelling pattern among the three species. In mouse, highly repetitive foldback DNA is present in the whole chromatin including the satellite DNA-containing regions. In Scilla sibirica, on the contrary, the highly repetitive foldback sequences are excluded from the satellite DNA loci and are arranged in clusters in the remaining chromatin. In rye, there is a clear preferential labelling of the chromocenters in the interphase nuclei as well as metaphase chromosomes, indicating that highly repetitive foldback DNA is preferentially located among other highly repetitive sequences.


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