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Nucleic Acids Research, 1981, Vol. 9, No. 11 2475-2494
© 1981

MOLECULAR BIOLOGY

Estrogen induces tissue specific changes in the chromatin conformation of the vitellogenin genes in Xenopus

Susan Gerber-Huber, Barbara K. Felber, Rudolf Weber and Gerhart U. Ryffel

Zoologisches Institut, Sahlistrasse 8, Universität Bern 3012 Bern, Switzerland

Received April 14, 1981. Nuclei from male Xenopus liver were digested extensively with DNase I and the residual amount of the four vitellogenin genes measured by hybridization with a moderate excess of vitellogenin cDNA. The saturation value was about twofold lower in chromatin isolated from liver cells of estrogen treated than from untreated males or from erythrocytes. Analyzing the disappearance of several defined restriction fragments specific for the A1 and A2 vitellogenin genes, after limited digestion with DNase I, suggested that the entire A1 and A2 vitellogenin genes are about twofold more sensitive to DNase I in chromatin of hepatocytes isolated from estrogen treated than from untreated males. Using the same assay no change in the DNase I sensitivity of the two vitellogenin genes in erythrocyte chromatin was observed. Analysis of the B1-globin and an albumin gene demonstrated that the DNase I sensitivity of these genes in both cell types is not altered by estrogen. All these data indicate that estrogen stimulation results in an increased DNase I sensitivity specific for the vitellogenin genes in hepatocytes.


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