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Centrosome organization and centriole architecture: their sensitivity to divalent cations
M Paintrand1, M Moudjou, H Delacroix
1Centre de Génétique Moléculaire du CNRS, Gif-sur-Yvette, France.
Journal of Structural Biology
|March 1, 1992
Summary
This study provides a detailed ultrastructural description of human centrosome organization, revealing new structural components and how divalent cations influence their architecture. This offers a clearer view of the centrosome
Area of Science:
- Cell Biology
- Structural Biology
- Microscopy
Background:
- The centrosome organizes the microtubule network and duplicates for cell division.
- A comprehensive ultrastructural description of animal cell centrosomes is currently lacking.
Purpose of the Study:
- To provide an integrated and detailed ultrastructural description of centrosome organization.
- To identify new structural components and understand the role of divalent cations.
Main Methods:
- Ultrastructural study of human lymphoblast centrosomes.
- Centrosome orientation via sedimentation, ultrathin serial sectioning, and digital micrograph analysis.
- Comparison of isolation methods with and without EDTA to assess divalent cation effects.
Main Results:
- Unambiguous description of pericentriolar organization and distal/subdistal appendages.
- Identification of new structures: external and internal columns associated with microtubules.
- Observed structural changes, including centriole diameter variation, upon EDTA treatment.
Conclusions:
- The centrosome exhibits a complex and dynamic structural organization.
- Divalent cations significantly modulate centrosome structure, affecting appendages and matrix.
- This study provides a comprehensive scheme of centrosome organization and cation modulation.