Alterations of the intranucleolar DNA localization caused by simulated microgravity
M A Sobol1, E L Kordyum, F Gonzalez-Camacho
1Institute of Botany of NASU, Kyiv, Ukraine. margaret_sobol@yahoo.com
Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|October 22, 2005
Summary
Altered gravity affects ribosome production by changing nucleolar DNA location and structure. This study suggests reduced DNA transcription in simulated microgravity, impacting cell function.
Area of Science:
- Cell Biology
- Gravitational Biology
- Molecular Biology
Background:
- The nucleolus is crucial for ribosome biogenesis.
- Its function under altered gravity conditions remains poorly understood.
- Ribosome production is essential for cellular function and protein synthesis.
Purpose of the Study:
- To investigate the impact of simulated microgravity on nucleolar DNA localization and ultrastructure.
- To explore the relationship between nucleolar changes and ribosome biosynthesis under altered gravity.
- To propose a mechanism for altered ribosome production in microgravity.
Main Methods:
- Utilized fluorescent and immunogold cytochemistry techniques.
- Examined the location of nucleolar DNA in both control and simulated microgravity conditions.
- Analyzed changes in nucleolar ultrastructure.
Main Results:
- Observed a redistribution of ribosomal DNA (rDNA) within nucleolar components.
- Identified concurrent alterations in nucleolar ultrastructure.
- These findings suggest a link between DNA redistribution and nucleolar structural changes.
Conclusions:
- Simulated microgravity induces significant changes in nucleolar organization.
- A redistribution of rDNA and altered ultrastructure likely impacts ribosome production.
- The study proposes a novel hypothesis of lowered rDNA transcription in simulated microgravity.
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