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The imprinted  Arabidopsis Polycomb  group (PcG) gene  MEDEA  ( MEA ), which is homologous to  Enhancer of Zeste  [ E(Z) ], is maternally required for normal seed development. Here we show that, unlike known mammalian imprinted genes, MEA regulates its own imprinted expression: It down-regulates the maternal allele around fertilization and maintains the paternal allele silent later during seed development. Autorepression of the maternal  MEA  allele is direct and independent of the MEA–FIE (FERTILIZATION-INDEPENDENT ENDOSPERM) PcG complex, which is similar to the E(Z)–ESC (Extra sex combs) complex of animals, suggesting a novel mechanism. A complex network of cross-regulatory interactions among the other known members of the MEA–FIE PcG complex implies distinct functions that are dynamically regulated during reproduction.

genes and development

Dynamic regulatory interactions of Polycomb group genes: MEDEA autoregulation is required for imprinted gene expression in Arabidopsis