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Nucleic Acids Research DNasel sensitivity of the rat albumin and a-fetoprotein genes

We have analyzed the DNasel sensitivity of chromatin from the rat albumin and a-fetoprotein genes in the fetal liver (which synthesizes albumin and a-fetoprotein), adult liver (which synthesizes albumin), fetal yolk sac (which synthesizes -fetoprotein), and adult kidney (which synthesizes neither). Active genes were much more sensitive than their kidney counterparts, and the adult liver a-fetoprotein and fetal yolk sac albumin genes showed intermediate levels of sensitivity. Sensitivity was analyzed as a function of the extent of DNasel digestion. Rate constants were calculated for the degradation of individual DNA hybridization bands and normalized to the intrinsic rate constants of the same bands degraded in purified DNA. This enabled us to eliminate the inconsistencies that otherwise result from comparing chromatin sensitivity of different DNA sequences, or chromatin sensitivity in different nuclear environments.