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Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Review
Environmentally coordinated epigenetic silencing of FLC by protein and long noncoding RNA components.
Current Opinion in Plant Biology 2012 Februrary
In Arabidopsis, the role of the vernalization pathway is to repress expression of a potent floral repressor, FLOWERING LOCUS C (FLC), after a sufficient period of winter cold has been perceived. Following winter, the lack of FLC expression allows unimpeded operation of the photoperiod pathway and hence rapid flowering of vernalized plants in spring via the activation of floral integrator genes. Molecular studies revealed that regulation of the key floral repressor, FLC, is under the control of the interplay between Trithorax group (TrxG)-mediated activation and Polycomb group (PcG)-mediated repression. On-off switch of genes by TrxG and PcG is an evolutionarily conserved mechanism to coordinate cellular identity in eukaryotes. Regulation of FLC by external cues provides an excellent model system to study mechanisms in which cell identity is influenced by environment. In this review, we discuss coordinated contributions by protein and long noncoding RNA components to this environmentally induced epigenetic switch of a developmental program in plants.
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