(Polycomb Group Protein FERTILIZATION-INDEPENDENT ENDOSPERM (FIE))
Polycomb group (PcG) protein. PcG proteins act by forming multiprotein complexes, which are required to maintain the transcriptionally repressive state of homeotic genes throughout development. PcG proteins are not required to initiate repression, but to maintain it during later stages of development. They probably act via the methylation of histones, rendering chromatin heritably changed in its expressibility. Required to prevent the proliferation of the central cell by repressing unknown target genes before fertilization. Probably also involved in floral repression mechanism established during early plant development. Regulates the anteroposterior organization of the endosperm. Interacts with the promoter and repress the transcription of genes such as PHE1, that are paternally active and maternally silenced.
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