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Updated: Jul 27, 2025
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Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development
Published on: March 5, 2017
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FIGL1 coordinates with dosage-sensitive BRCA2 in modulating meiotic recombination in maize
Ting Zhang1, Shuang-Hui Zhao1, Yan Wang1
1MOE Key Laboratory of Crop Heterosis and Utilization, National Maize Improvement Center of China, College of Agronomy and Biotechnology, China Agricultural University, Beijing, China.
Journal of Integrative Plant Biology
|June 9, 2023
Summary
Maize BRCA2 and FIGL1 positively regulate meiotic crossover (CO) formation by controlling DNA recombinase stability. Their combined action is crucial for proper chromosome segregation and genetic diversity in offspring.
Area of Science:
- Genetics
- Molecular Biology
- Plant Science
Background:
- Meiotic crossover (CO) formation is essential for homologous chromosome segregation and genetic diversity.
- Mechanisms modulating CO formation in maize are not well understood.
Purpose of the Study:
- To investigate the roles of maize BRCA2 and FIGL1 in meiotic CO formation.
- To elucidate the molecular mechanisms by which these proteins influence COs.
Main Methods:
- Analysis of maize mutants for BRCA2 and FIGL1.
- Assessing RAD51 and DMC1 foci dynamics.
- Investigating protein interactions and dosage effects.
Main Results:
- Maize BRCA2 and FIGL1 act as positive factors for CO formation.
- They control the assembly and stability of RAD51 and DMC1 recombinase filaments.
- ZmBRCA2 regulates COs in a dosage-dependent manner.
- ZmFIGL1 interacts with RAD51 and DMC1, and its mutants show reduced COs.
- Loss of both ZmFIGL1 and ZmBRCA2 severely impairs meiotic progression.
Conclusions:
- ZmBRCA2 and ZmFIGL1 coordinate to regulate DNA repair dynamics, promoting CO formation in maize.
- This contrasts with their antagonistic roles in Arabidopsis, highlighting species-specific adaptations in CO regulation.
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