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Nucleic Acids Research, 1977, Vol. 4, No. 4 771-789
© 1977

Articles

Structural repeat units of Chinese hamster ovary chromatin. Evidence for variations in repeat unit DNA size in higher eukaryotes.

Randolph L. Rill, Daniel A. Nelson, Darlene K. Oosterhof and John C. Hozier

Department of Chemistry and Institute of Molecular Biophysics, The Florida State University Tallahassee, FL 32306, USA

Received November 1, 1976. DNA lengths in the structural repeat units of Chinese hamster ovary (CHO) and chicken erythrocyte chromatin were compared by analyzing the sizes of DNA fragments produced after treatment of nuclei with staphylococcal nuclease. The repeat length of CHO chromatin (173 ±4 BP) is about 20 base pairs (BP) smaller than that of chicken erythrocyte chromatin (194 ± 8 BP). Repeat lengths of rat liver and calf thymus chromatin were found to be about 10 BP shorter than that of chicken erythrocyte chromatin. Thus significant variations occur in repeat units of chroraatin of higher eukaryotes. These variations occur in the lengths of "spacer" (or "internucleosomal") DNA segments, not in "core particle" (or "nucleosomal") DNA lengths. The concept of spacer regions and the possible influence of H1 histones is discussed.


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