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Evidence for postmeiotic expression of ribosomal RNA genes during male gametogenesis

✍ Scribed by M. Schmid; F. J. Hofgärtner; Maria T. Zenzes; W. Engel

Book ID
104758539
Publisher
Springer
Year
1977
Tongue
English
Weight
359 KB
Volume
38
Category
Article
ISSN
0340-6717

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✦ Synopsis

Pre-and postmeiotic stages of male gametogenesis of 10 different vertebrate species belonging to mammals, birds, amphibians, and fishes were subjected to the Ag-AS staining technique (Goodpasture and Bloom, 1975). A uniform pattern of silver-staining is observable during spermatogenesis of the different vertebrate species. Silver-staining is present in spermatogonia and during the whole period of meiotic prophase, but totally absent during diakinesis and metaphase II of meiosis. In early spermatids silver-staining reappears and only disappears around the beginning of elongation of the. spermatid nucleus. Since the Ag-AS technique is believed to stain only transcriptionally active nucleolus organizer regions, our findings indicate that ribosomal RNA genes become reactivated in the haploid spermatid.

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