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JXB Advance Access originally published online on May 25, 2006
Journal of Experimental Botany 2006 57(9):2111-2119; doi:10.1093/jxb/erj169
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Published by Oxford University Press [2006] on behalf of the Society for Experimental Biology.

RESEARCH PAPER

MGOUN3: evidence for chromatin-mediated regulation of FLC expression

Soazig Guyomarc'h1 *, Moussa Benhamed1, Gaëtan Lemonnier2, Jean-Pierre Renou2, Dao-Xiu Zhou1 and Marianne Delarue1,{dagger}

1Institut de Biotechnologie des Plantes, UMR CNRS 8618, Bât. 630. Université Paris XI, F-91405 Orsay cedex, France
2Unité de Recherche en Génomique Végétale, INRA, 2 rue Gaston Crémieux, F-91057 Evry, France

{dagger}To whom correspondence should be addressed. E-mail: delarue{at}ibp.u-psud.fr

The MGOUN3(MGO3)/BRUSHY1(BRU1)/TONSOKU(TSK) gene of Arabidopsis thaliana encodes a nuclear leucine–glycine–asparagine (LGN) domain protein that may be implicated in chromatin dynamics and genome maintenance. Mutants with defects in MGO3 display a fasciated stem and disorganized meristem structures. The transition to flowering was examined in mgo3 mutants and it was found that, under short days, the mutants flowered significantly earlier than the wild-type plants. Study of flowering-time associated gene expression showed that the floral transition inhibitor gene FLC was under-expressed in the mutant background. Ectopic expression of the flower-specific genes AGAMOUS (AG), PISTILLATA (PI), and SEPALLATA3 (SEP3) in mgo3 vegetative organs was also detected. Western blot and chromatin immunoprecipitation experiments suggested that histone H3 acetylation may be altered in the mgo3 background. Together, these data suggest that MGO3 is required for the correct transition to flowering and that this may be mediated by histone acetylation and associated changes in FLC expression.

Key words: Arabidopsis thaliana, BRU1, chromatin dynamics, FLC, histone modifications, MGO3, TSK


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