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• W2011199468 abstract "Abstract Background Histone acetyltransferases (HATs) play critical roles in the regulation of chromatin structure and gene expression. Arabidopsis genome contains 12 HAT genes, but the biological functions of many of them are still unknown. In this work, we studied the evolutionary relationship and cellular functions of the two Arabidopsis HAT genes homologous to the MYST family members. Results An extensive phylogenetic analysis of 105 MYST proteins revealed that they can be divided into 5 classes, each of which contains a specific combination of protein modules. The two Arabidopsis MYST proteins, HAM1 and HAM2, belong to a green clade, clearly separated from other families of HATs. Using a reverse genetic approach, we show that HAM1 and HAM2 are a functionally redundant pair of genes, as single Arabidopsis ham1 and ham2 mutants displayed a wild-type phenotype, while no double mutant seedling could be recovered. Genetic analysis and cytological study revealed that ham1ham2 double mutation induced severe defects in the formation of male and female gametophyte, resulting in an arrest of mitotic cell cycle at early stages of gametogenesis. RT-PCR experiments and the analysis of transgenic plants expressing the GUS reporter gene under the HAM1 or the HAM2 promoter showed that both genes displayed an overlapping expression pattern, mainly in growing organs such as shoots and flower buds. Conclusion The work presented here reveals novel properties for MYST HATs in Arabidopsis. In addition to providing an evolutionary relationship of this large protein family, we show the evidence of a link between MYST and gamete formation as previously suggested in mammalian cells. A possible function of the Arabidopsis MYST protein-mediated histone acetylation during cell division is suggested." @default.
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• W2011199468 date "2008-11-28" @default.
• W2011199468 modified "2023-10-08" @default.
• W2011199468 title "The MYST histone acetyltransferases are essential for gametophyte development in Arabidopsis" @default.
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• W2011199468 doi "https://doi.org/10.1186/1471-2229-8-121" @default.
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