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• W2027061907 abstract "An EcoRI chromatin fragment containing the adult beta-globin gene and flanking sequences, isolated from chicken erythrocyte nuclei, sediments at a reduced rate relative to bulk chromatin fragments of the same size. We show that the specific retardation cannot be reversed by adding extra linker histones to native chromatin. When the chromatin fragments are unfolded either by removing linker histones or lowering the ionic strength, the difference between globin and bulk chromatin fragments is no longer seen. The refolded chromatin obtained by restoring the linker histones to the depleted chromatin, however, exhibits the original sedimentation difference. This difference is therefore due to a special property of the histone octamers on the active gene that determines the extent of its folding into higher-order structure. That it is not due to the differential binding of linker histones in vitro is shown by measurements of the protein to DNA ratios using CsCl density-gradients. Both before and after selective removal of the linker histones, the globin gene fragment and bulk chromatin fragments exhibit only a marginal difference in buoyant density. In addition, we show that cleavage of the EcoRI fragment by digestion at the 5′ and 3′ nuclease hypersensitive sites flanking the globin gene liberates a fragment from between these sites that sediments normally. We conclude that the hypersensitive sites per se are responsible for the reduction in sedimentation rate. The non-nucleosomal DNA segments appear to be too long to be incorporated into the chromatin solenoid and thus create spacers between separate solenoidal elements in the chromatin, which can account for its hydrodynamic behaviour." @default.
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• W2027061907 date "1987-01-01" @default.
• W2027061907 modified "2023-09-25" @default.
• W2027061907 title "Perturbation of chromatin structure in the region of the adult beta-globin gene in chicken erythrocyte chromatin" @default.
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• W2027061907 doi "https://doi.org/10.1016/0022-2836(87)90626-7" @default.
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