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On the diversity of sperm histones in the vertebrates: II. A cytochemical study of the basic protein transitions during spermiogenesis in the cartilaginous fishHydrolagus colliei

✍ Scribed by Bols, N. C. ;Kasinsky, H. E.

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
535 KB
Volume
198
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Spermiogenesis in the ratfish (Hydrolagus colliei) is characterized by unusual changes in the basic proteins of the nucleus. Cytochemical analysis indicates that early spermatids in this cartilaginous fish contain the somatic type of histones. However, late spermatids contain the salmon type of sperm histone whereas spermatozoa display the mouse/grasshopper type designated by Bloch ('69). Such an unusual cytochemical shift from protamine in the spermatid to “stable protamine” in the sperm has not been documented heretofore.

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The variability of sperm histones in frogs has been studied by cytochemical and amino acid analyses. Cytochemically, Rana sperm proteins fall into Bloch's ('69, '76) type 4 somatic-like histone category, while Xenopus and Bufo have type 3 intermediate sperm histones. Extractability in 5% trichloroac