The cellular program for the formation and dissolution of the synaptonemal complex in Coprinus

Area of Science:

• Cell Biology
• Genetics
• Molecular Biology

Background:

• The synaptonemal complex (SC) is crucial for homologous chromosome pairing during meiosis.
• Understanding the temporal regulation of SC formation and dissolution is key to meiosis research.

Purpose of the Study:

• To investigate the cellular program governing synaptonemal complex (SC) formation and dissolution.
• To determine the role of protein synthesis in SC assembly and disassembly during meiosis.

Main Methods:

• Utilized cycloheximide to inhibit protein synthesis at specific meiotic time points in Coprinus cinereus.
• Synchronous meiotic system of Coprinus cinereus for precise temporal analysis.
• Observed the effects of protein synthesis inhibition on SC component localization and polycomplex formation.

Main Results:

• Proposed a four-step pathway for SC synthesis and assembly, requiring continuous protein synthesis.
• Identified transition points for SC component synthesis (4h) and central component transport (5h) post-karyogamy.
• Demonstrated that protein synthesis is required for SC dissolution, with inhibition leading to polycomplex accumulation.

Conclusions:

• The study elucidates a detailed temporal pathway for SC formation and dissolution.
• Protein synthesis is indispensable for all stages of SC lifecycle, including assembly and breakdown.
• Findings are supported by literature mutations in various organisms, validating the proposed pathway.