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Balbiani ring hnRNP substructure visualized by selective staining and electron spectroscopic imaging
A L Olins1, D E Olins, D P Bazett-Jones
1University of Tennessee-Oak Ridge Graduate School of Biomedical Sciences, Biology Division 37831-8077.
The Journal of Cell Biology
|May 1, 1992
Summary
Researchers discovered a novel RNA-rich particulate substructure within Balbiani Ring granules in Chironomus salivary glands. These 10-nm particles, enriched in phosphorus, offer new insights into gene expression and ribonucleoprotein organization.
Area of Science:
- Cell Biology
- Molecular Biology
- Chromosomal Research
Background:
- Balbiani Rings (BR) in Chironomus salivary glands are key sites of active gene transcription.
- Nascent ribonucleoprotein complexes (RNPs) assemble into granules during transcription.
Purpose of the Study:
- To investigate the substructure of Balbiani Ring granules.
- To characterize the composition and organization of RNA within these granules.
Main Methods:
- Utilized osmium ammine B, a nucleic acid-specific stain, on Lowicryl sections.
- Employed electron energy filtered imaging for elemental analysis of BR granules.
Main Results:
- Identified a distinct RNA-rich particulate substructure within BR granules.
- Observed 10-nm particles, with 10-12 particles per granule, enriched in phosphorus.
- Elemental imaging confirmed phosphorus enrichment in these particles.
Conclusions:
- The study reveals a novel particulate organization of RNA within Balbiani Ring granules.
- Discusses the potential relationship of these particles to ribonucleosomes and their arrangement.
- Provides a foundation for understanding RNP organization during high-level transcription.