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Silver staining of meiotic chromosomes in the fungus, Coprinus cinereus
Abstract:
We have taken advantage of the synchronous meiotic process in the basidiomycete Coprinus cinereus to develop a simple and rapid method to selectively stain meiotic chromosomes and nucleoli in this fungus without prior removal of the cell wall. Electron microscopic examination of these silver-stained chromosomes indicated that the lateral elements of the synaptonemal complexes were prominently stained, and terminal attachment plaques were apparent. We found that a translocation quadrivalent could be recognized easily in the light microscope using these methods. The procedures appear suitable for the characterization of chromosome rearrangements in this small genome, and should facilitate cytogenetic analysis in this fungus.
Insights
Researchers developed a rapid silver-staining method for Coprinus cinereus meiotic chromosomes. This technique allows for easy visualization of chromosome rearrangements, aiding fungal cytogenetics.
Area of Science:
- Mycology
- Cytogenetics
- Molecular Biology
Background:
- The basidiomycete Coprinus cinereus exhibits a synchronous meiotic process, making it a model organism for studying meiosis.
- Accurate visualization of meiotic chromosomes is crucial for understanding chromosome behavior and identifying rearrangements.
Purpose of the Study:
- To develop a simple, rapid, and effective method for selectively staining meiotic chromosomes and nucleoli in Coprinus cinereus.
- To facilitate cytogenetic analysis and the characterization of chromosome rearrangements in this fungus.
Main Methods:
- A novel silver-staining technique was applied directly to Coprinus cinereus cells, bypassing the need for cell wall removal.
- Electron microscopy was used to examine the stained meiotic chromosomes and synaptonemal complexes.
- Light microscopy was employed to assess the visibility of chromosome structures, including translocation quadrivalents.
Main Results:
- The silver-staining method effectively stained meiotic chromosomes and nucleoli without prior cell wall removal.
- Electron microscopy revealed prominent staining of synaptonemal complex lateral elements and apparent terminal attachment plaques.
- Translocation quadrivalents were readily recognizable under light microscopy, demonstrating the method's utility.
Conclusions:
- The developed staining procedure is simple, rapid, and suitable for characterizing chromosome rearrangements in Coprinus cinereus.
- This method significantly facilitates cytogenetic analysis in this fungus, particularly for small genomes.
- The technique offers a valuable tool for advancing our understanding of fungal meiosis and genome stability.