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- W2007135062 abstract "Spermatogenesis in the dogfish is characterized by the synchronous development of germinal cells inside follicles. This particularity has permitted studies on precise stages of cell differentiation, especially on the evolution of chromatin structure. A microelectrophoretic method has been devised for the determination of the basic nuclear protein content of accurately identified homogeneous stages of spermatid differentiation. No significant difference was observed during the first stages of spermiogenesis, i.e., in round spermatids, where a typical histone complement was present. At the beginning of nuclear elongation, two new basic protein fractions appeared and coexisted for some time with typical histones; they replaced somatic histones progressively. Later, during elongation, four proteins of high electrophoretic mobility appeared and gradually replaced the intermediary basic proteins. In elongated spermatids, DNA was found tightly packed by these four proteins: three are arginine- and cysteine-rich (Z1, Z2 and S4), the fourth is arginine-rich (Z3). At first, these fractions are all soluble in 0.25 M HCl but during sperm maturation only one (Z3) remains acid-soluble, the others being extractable only after reducing and alkylating treatments. This modification of solubility of Z1, Z2 and S4 corresponded to the oxidation of cysteine residues to form SS crosslinks in chromatin of mature sperm cells. Thus spermiogenesis of the dogfish shows two basic nuclear protein transitions which both occur during nuclear elongation." @default.
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- W2007135062 date "1981-12-01" @default.
- W2007135062 modified "2023-09-30" @default.
- W2007135062 title "Microelectrophoretic analysis of basic protein changes during spermiogenesis in the dogfish Scylliorhinus caniculus (L.)" @default.
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- W2007135062 doi "https://doi.org/10.1016/0014-4827(81)90018-5" @default.
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