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Epigenetic maintenance of the vernalized state in Arabidopsis thaliana requires LIKE
 

Summary: Epigenetic maintenance of the vernalized state
in Arabidopsis thaliana requires LIKE
HETEROCHROMATIN PROTEIN 1
Sibum Sung1,5, Yuehui He1,4,5, Tifani W Eshoo1, Yosuke Tamada1, Lianna Johnson2, Kenji Nakahigashi3,4,
Koji Goto3,4, Steve E Jacobsen2 & Richard M Amasino1
Vernalization is the process by which sensing a prolonged
exposure to winter cold leads to competence to flower in
the spring. In winter annual Arabidopsis thaliana accessions,
flowering is suppressed in the fall by expression of the potent
floral repressor FLOWERING LOCUS C (FLC)1. Vernalization
promotes flowering via epigenetic repression of FLC2.
Repression is accompanied by a series of histone modifications
of FLC chromatin that include dimethylation of histone H3 at
Lys9 (H3K9) and Lys27 (H3K27)3,4. Here, we report that
A. thaliana LIKE HETEROCHROMATIN PROTEIN 1 (LHP1) is
necessary to maintain the epigenetically repressed state of FLC
upon return to warm conditions typical of spring. LHP1 is
enriched at FLC chromatin after prolonged exposure to cold,
and LHP1 activity is needed to maintain the increased levels
of H3K9 dimethylation at FLC chromatin that are characteristic

  

Source: Amasino, Richard M. - Department of Biochemistry, University of Wisconsin at Madison

 

Collections: Biology and Medicine