Updating and interaction of polycomb repressive complex 2 components in maize (Zea mays)

Area of Science:

• Plant Molecular Biology
• Epigenetics
• Genomics

Background:

• Polycomb group (PcG) proteins form multi-subunit complexes (PRCs) that regulate gene expression through chromatin condensation.
• While distinct PRC2 complexes are known in Arabidopsis, their core components and functions in cereals like maize are not well understood.

Purpose of the Study:

• To update the genome-wide information on maize polycomb repressive complex 2 (PRC2) core components.
• To elucidate the protein-protein interaction networks of PRC2 components in maize.
• To gain insights into the roles of maize PRC2 in plant development.

Main Methods:

• Genome-wide analysis of maize PRC2 components.
• Protein-protein interaction network mapping.
• Gene expression analysis (preferential and broad expression patterns).
• Imprinting analysis (maternal and paternal expression).

Main Results:

• Maize PRC2 subunits are highly duplicated, with multiple homologs for MSI1, E(z), ESC, and Su(z)12.
• Differential expression and imprinting patterns were observed for maize FIE homologs (ZmFIE1, ZmFIE2).
• Specific PRC2 complexes, such as FIE1-PRC2 and FIE2-PRC2, likely regulate distinct developmental processes, including endosperm development.
• Interactions between maize PRC2 members and conserved proteins like MEA and FIS2 were identified.

Conclusions:

• This study provides a comprehensive update on maize PRC2 components and their interactions at a genome-wide scale.
• The findings establish a protein-protein interaction roadmap for maize PRC2, enhancing understanding of its function in cereal development.
• The results suggest specialized roles for different maize PRC2 complexes in regulating plant growth and development.