ZEP1 orchestrates template choice and crossover pathways to ensure meiotic genome integrity in rice.

Loss of rice ZEP1 disrupts homologous recombination, causing asynapsis and chromosome fragmentation, highlighting its crucial role in meiotic genome integrity.

• Why it matters: Ensuring accurate crossover formation during meiosis is vital for proper chromosome segregation and fertility; understanding the molecular regulation of this process addresses key gaps in reproductive biology.
• What they did: Researchers examined ZEP1, a transverse filament protein of the synaptonemal complex, using genetic mutants and protein interaction analyses, revealing its role after strand invasion and its interactions with anti-crossover factors.
• The result: Findings show ZEP1 coordinates anti-crossover modules and recombination intermediate processing, enabling faithful homologous recombination; this insight offers potential avenues to manipulate crossover outcomes in rice breeding.