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Nucleic Acids Research, 1979, Vol. 7, No. 6 1713-1735
© 1979

Articles

The similarity of DNA sequences remaining bound to scaffold upon nuclease treatment of interphase nuclei and metaphase chromosomes

S.V. Razin, V.L. Mantieva and G.p. Georgiev

Institute of Molecular Biology, USSR Academy of Sciences Vavilov street 32, Moscow B-334, USSR

Received June 8, 1979. The fragments of DNA attached to protein skeleton of in-terphase nuclei or metaphase chromosomes were obtained. Both the method involving restriction endonuclease treatment /1,2/ and a novel procedure based on mild staphylococcal muclease digestion were used. In the latter case, DNA fragments remaining bound to nuclei or chromosomes are not enriched in satellite but only in abundant middle repetitive DNA. The snorter the fragments of attached DNA, the higher the content of middle repetitive DNA in the fraction. It has a slightly higher density in a CsCl gradient comparing to the main DNA. The yield of attached DNA, its distribution in a CsCl density gradient, and its renaturation properties are essentially the same for interphase and metaphase chromosomes. The average size of DNA loops was found to be equal to{bsim}60 kb for both metaphase chromosomes and interphase nuclei. The conclusion has been drawn that the bulk of attachment sites of DNP fibrils to axial chromosomal structures remains unchanged during the cell cycle.


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