Abstract
Double-nucleosome periodicity of DNA fragmentation with DNAse I in the nuclei of cells differing in size of the linker DNA length and lysine-rich histone composition was analyzed by means of nondenaturing agarose gel electrophoresis. DNAse I revealed this type of periodicity in rat thymus and CHO cell nuclei as well as in erythrocyte nuclei. It has been deduced that the so-called nucleodisome structure is also typical of cells possessing a usual DNA repeat length (200 bp or less) and lysine-rich histone H1. Two probably related events are important for establishing a clear double-nucleosome periodicity of DNA fragmentation: the replacement of H1 histone by a specific arginine-rich histone fraction (H5 histone in the case of erythrocyte) and the increase of the linker DNA length. The results are interpreted in terms of supranucleosomal organization of chromatin which may determine the dinucleosome periodicity of DNA fragmentation due to a specific packing of nucleosomes.
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Pospelov, V.A., Svetlikova, S.B. Higher order chromatin structure determines double-nucleosome periodicity of DNA fragmentation. Mol Biol Rep 8, 117–122 (1982). https://doi.org/10.1007/BF00778514
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DOI: https://doi.org/10.1007/BF00778514