Related Experiment Videos
Is the sphere organelle/coiled body a universal nuclear component?
1Department of Embryology, Carnegie Institution, Baltimore, Maryland 21210.
Developmental Genetics
|January 1, 1995
Summary
This study identifies four nuclear organelles as homologous, proposing the sphere organelle/coiled body is a universal component involved in RNA processing and snRNP assembly across eukaryotic cells.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Four distinct nuclear organelles (coiled bodies, prenucleolar bodies, sphere organelles, Binnenkörper) have been described.
- These organelles share common protein components, including coilin and small nuclear ribonucleoproteins (snRNPs).
Purpose of the Study:
- To establish the homology between four previously distinct nuclear organelles.
- To propose a universal function for the sphere organelle/coiled body in eukaryotic cells.
- To elucidate the role of this organelle in RNA processing and snRNP biogenesis.
Main Methods:
- Comparative analysis of nuclear organelle structures and protein compositions.
- Immunological detection of coilin and snRNPs in various cell types and experimental systems.
Main Results:
- Evidence presented supports the essential homology of coiled bodies, prenucleolar bodies, sphere organelles, and Binnenkörper.
- All four identified organelles contain coilin or related proteins and various snRNPs.
- The sphere organelle/coiled body is proposed as a universal nuclear component found in most eukaryotic cells.
Conclusions:
- The sphere organelle/coiled body is a conserved nuclear structure crucial for cellular function.
- It likely serves as a primary site for the assembly and sorting of snRNP complexes.
- This organelle plays a role in multiple RNA processing pathways, including pre-mRNA splicing, rRNA processing, and histone pre-mRNA 3' end formation.