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- W1978793054 abstract "Precipitate resulting from interaction between certain intercalators, such as acridine orange (AO), and nucleic acids can be detected by electron microscopy. Formation of precipitate in nuclei of live cells is modulated by chromatin structure. Susceptibility of in situ DNA to precipitation was studied in mouse testicular germ cells during various stages of sperm maturation. DNA in round spermatid chromatin, similar to somatic cell euchromatin, was rather resistant to precipitation; the electron-dense precipitate was granular and randomly distributed. DNA in elongated spermatids was more susceptible to precipitation; the products were in the form of fibers. At early stages of spermatid maturation these fibers were distributed uniformly throughout the entire nucleus. At later stages, the products appeared as approximately 25-nm-thick fibers arranged longitudinally in arrays within the nucleus. With further cell maturation, fibers in the anterior portion of the nucleus appeared to fuse, forming homogeneously dense product. These fibrous products likely represent AO interactions with DNA in chromatin in which transition proteins had replaced histones. Changing patterns of these precipitated fibers likely reflect progressive stages of chromatin condensation, which starts at the center and anterior portion of the nucleus where the fibers coalesce. Mature sperm cell DNA, known to be complexed with protamines, was more resistant to AO-induced precipitation. The data suggest that precipitation induced by AO and monitored by electron microscopy may be a useful probe of nuclear chromatin structure." @default.
- W1978793054 created "2016-06-24" @default.
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- W1978793054 date "1990-04-01" @default.
- W1978793054 modified "2023-09-23" @default.
- W1978793054 title "Acridine orange-induced precipitation of mouse testicular sperm cell DNA reveals new patterns of chromatin structure" @default.
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- W1978793054 doi "https://doi.org/10.1016/0014-4827(90)90100-o" @default.
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