PMID: 7371450Jan 1, 1980Paper

Molecular structure of chromatin during sperm differentiation of the dogfish Scyliorhinus caniculus (L.)

Chromosoma
M Gusse, P Chevaillier

Abstract

The molecular structure of chromatin during dogfish spermiogenesis was examined by electron microscopy after the dispersion of nuclei at low ionic strength. In early and late stages of differentiation (round and elongating spermatids), chromatin is globular, although basic nuclear proteins are different from those present in somatic nuclei. Three protein fractions are complexed with DNA in sperm nuclei. These fractions appear at the end of differentiation (elongated spermatids), subsequently undergoing a modification of their solubilization properties; only one protein fraction remains acid-soluble. Dispersed chromatin from sperm nuclei again shows a beads-on-a-string configuration both in the presence of the three specific sperm proteins and when the acid soluble fraction is extracted. Variations of the mean diameter of chromatin subunits during spermiogenesis appear rather limited compared to extensive modifications of chromatin superstructures.

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Citations

Jan 1, 1986·Chromosoma·M S RisleyD A Bumcrot
Mar 5, 1993·Biochimica Et Biophysica Acta·M KouachG Briand
Oct 1, 1981·European Journal of Biochemistry·P SautièreP Chevaillier
Sep 18, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·David MillerDavid Iles
May 1, 1983·Journal of Ultrastructure Research·H P Stanley

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