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Human Genetics

, Volume 38, Issue 1, pp 57–63 | Cite as

Activation of mouse ribosomal RNA genes at the 2-cell stage

  • W. Engel
  • Maria T. Zenzes
  • M. Schmid
Original Investigations

Summary

The Ag-AS method, developed by Goodpasture and Bloom (1975) stains transcriptionally active nucleolus organizer regions (NORs) on the chromosomes and in the interphase nuclei. Metaphases and interphase nuclei of early mouse embryos (unfertilized eggs, pronucleus stages, 2-, 4-, 8-cell stages, and morulae) were subjected to silver-staining. First staining of a single chromosome bearing an NOR was observed at the 2-cell stage. At the 4-cell stage 4–6 chromosomes, and at the 8-cell stage invariably all the 6 chromosomes known to bear NORs, respond positively to silver-staining. These results indicate that during mouse embryogenesis ribosomal RNA genes start to function at the 2-cell stage. The polar body does not respond to silver-staining, which supports the view that the polar body genome remains inactive.

Keywords

Internal Medicine Metabolic Disease Mouse Embryo Organizer Region Polar Body 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • W. Engel
    • 1
  • Maria T. Zenzes
    • 1
  • M. Schmid
    • 2
  1. 1.Institut für Humangenetik und AnthropologieFreiburgGermany
  2. 2.Abteilung für Humangenetik der UniversitätUlmGermany

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