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Papers In Press, published online ahead of print May 9, 2003
Institut de Biotechnologie des Plantes, Université Paris XI, Orsay 91405
Corresponding Author: zhou{at}ibp.u-psud.fr
Histone acetyltransferases (HAT), which are able to acetylate histone and non-histone proteins, play important roles in gene regulation. Many HATs are related to yeast Gcn5, a component of two transcription regulatory complexes SAGA and ADA. In this work, by characterizing a mutation in the Arabidopsis GCN5 gene (AtGCN5) we studied the regulatory function of this gene in controlling floral meristem activity. We show that in addition to pleiotropic effects on plant development, this mutation produces also terminal flowers on the inflorescences. The flowers show homeotic transformations of petals into stamens and sepals into filamentous structures and produce ectopic carpels. The phenotypes correlate to an expansion of the expression domains within floral meristems of the key regulatory genes WUSCHEL (WUS) and AGAMOUS (AG). These results suggest that AtGCN5 is required to regulate the floral meristem activity through the WUS/AG pathway. This study brings new elements on the elucidation of specific developmental pathways regulated by AtGCN5 and on the control mechanism of meristem regulatory gene expression
J. Biol. Chem, 10.1074/jbc.M302787200
Submitted on March 19, 2003
Revised on May 7, 2003
Accepted on May 9, 2003
Arabidopsis histone acetyltransferase AtGCN5 regulates the floral meristem activity through the WUSCHEL/AGAMOUS Pathway
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