Abstract
We have analyzed the chromosomal protein composition of the sperm from several species belonging to three different classes (Hydrozoa, Scyphozoa, Anthozoa) of the phylum Cnidaria. In every instance, the sperm nuclear basic proteins (SNBPs) were found to consist of one to two major protein fractions that belong to the histone H1 family, as can be deduced from their amino acid composition and solubility in dilute perchloric acid, and the presence of a trypsin-resistant core. In those species where mature spawned sperm could be obtained, we were able to show that these proteins completely replace the somatic histones from the stem cells that are present at the onset of spermatogenesis. The presence of a highly specialized histone H1 molecule in the sperm of this phylum provides support for the idea that the protamine-like proteins (PL) from higher groups in the phylogenetic tree (and possibly protamines as well) may all have evolved from a primitive histone H1 ancestor.
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Abbreviations
- SNBPs:
-
sperm nuclear basic proteins
- PL:
-
protamine-like protein
- HPLC:
-
high-performance liquid chromatography
- TFA:
-
trifluoroacetic acid
- PAGE:
-
polyacrylamide gel electrophoresis
- PCA:
-
perchloric acid
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Rocchini, C., Marx, R.M., Schnorr von Carosfeld, J. et al. Replacement of nucleosomal histones by histone H1-like proteins during spermiogenesis in Cnidaria: Evolutionary implications. J Mol Evol 42, 240–246 (1996). https://doi.org/10.1007/BF02198850
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DOI: https://doi.org/10.1007/BF02198850