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Morphological Studies of Nucleologenesis in Giardia lamblia.
- Source :
-
Anatomical record (Hoboken, N.J. : 2007) [Anat Rec (Hoboken)] 2016 May; Vol. 299 (5), pp. 549-56. Date of Electronic Publication: 2016 Feb 22. - Publication Year :
- 2016
-
Abstract
- The nucleolus is a nuclear organelle involved in ribosome biogenesis. In most eukaryotes this structure disperses during prophase through anaphase and reorganizes at telophase by a process known as nucleologenesis. This process involves new transcription of ribosomal DNA at the nucleolar organizer region and the formation of prenucleolar bodies fusing to it. In Giardia lamblia, for a long time considered the only anucleolated eukaryote, a very small nucleolus has been recently described. In order to evaluate whether nucleologenesis is also present in Giardia, we analyzed the distribution of nucleolar material during telophase using different light and electron microscopy techniques including silver staining for the nucleolar organizer. Results indicate that in G. lamblia, nucleolar elements persist mainly as an intranuclear peripheral organelle during all stages of division, including telophase, however, no prenucleolar bodies are detected in the nucleoplasm. Therefore, in the parasite, nucleolar material is present throughout cell division including telophase and formation of prenucleolar bodies may not be required for nucleologenesis.<br /> (© 2016 Wiley Periodicals, Inc.)
- Subjects :
- Cell Nucleolus chemistry
Cell Nucleolus ultrastructure
Cell Nucleus chemistry
Cell Nucleus ultrastructure
DNA, Ribosomal metabolism
Giardia lamblia cytology
Giardia lamblia ultrastructure
Microscopy, Electron, Transmission
Nuclear Proteins metabolism
Nucleolus Organizer Region chemistry
Nucleolus Organizer Region ultrastructure
Cell Nucleolus metabolism
Cell Nucleus metabolism
Giardia lamblia metabolism
Mitosis physiology
Nucleolus Organizer Region metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1932-8494
- Volume :
- 299
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Anatomical record (Hoboken, N.J. : 2007)
- Publication Type :
- Academic Journal
- Accession number :
- 26833978
- Full Text :
- https://doi.org/10.1002/ar.23323