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• W2051508893 abstract "Cytological and biochemical experiments were undertaken to elucidate the mechanisms responsible for the reciprocal Giemsa staining of BrdU-substituted and unsubstituted chromosome regions subjected to high or low pH NaH2PO4 treatments. These experiments included staining of chromosome preparations with ethidium bromide (EB), acridine orange (AO), or dansyl chloride, digestion of BrdU-substituted and unsubstituted chromatin with pancreatic DNase I, and SDS polyacrylamide gel electrophoresis of the proteins extracted from, and those remaining in isolated, fixed, air-dried nuclei subjected to either NaH2PO4 treatment. The collective evidence from this and previous work clearly indicates that, although the staining reactions following the different pH treatments are reciprocal, the mechanisms of induction of the staining effects are not. After the high pH treatment, BrdU-substituted and unsubstituted chromosome regions are palely and intensely stained with Giemsa, respectively. This treatment preferentially solubilizes BrdU-substituted DNA, probably as a result of the photolysis or high temperature hydrolysis of BrdU-DNA. Concomitantly, this treatment selectively denatures the BrdU-DNA. The reduction in the amount of DNA in the BrdU regions leads to a quantitative decrease in Giemsa-dye binding, resulting in pale staining relative to unsubstituted regions. The extraction of BrdU-substituted DNA does not appear to simultaneously extract much chromosomal protein. After the low pH treatment, BrdU-substituted and unsubstituted regions appear intensely and palely stained with Giemsa, respectively. BrdU substitution greatly increases the binding affinity of histone H1 to DNA, and the low pH treatment preferentially extracts the less tightly bound H1 of the unsubstituted chromatin. This extraction of H1 is presumably responsible for the preferential dispersion of unsubstituted DNA outside the boundaries of the chromosome onto the surrounding area of the slide. The unsubstituted chromosome regions subsequently stain relatively palely with Giemsa, because the DNA in these regions is more dispersed than that in the BrdU-substituted regions. The low pH treatment concomitantly denatures the unsubstituted DNA." @default.
• W2051508893 created "2016-06-24" @default.
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• W2051508893 date "1982-09-01" @default.
• W2051508893 modified "2023-09-24" @default.
• W2051508893 title "The mechanisms responsible for reciprocal BrdU-Giemsa staining" @default.
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• W2051508893 doi "https://doi.org/10.1016/0014-4827(82)90075-1" @default.
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