Arabidopsis thaliana telomeres exhibit euchromatic features
2011
Vaquero Sedas, María Isabel | Gámez Arjona, Francisco M. | Vega Palas, Miguel Ángel | Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular | Ministerio de Educación y Ciencia (MEC). España
Telomere function is influenced by chromatin structure and organization, which usually involves epigenetic modifications. We describe here the chromatin structure of Arabidopsis thaliana telomeres. Based on the study of six different epigenetic marks we show that Arabidopsis telomeres exhibit euchromatic features. In contrast, subtelomeric regions and telomeric sequences present at interstitial chromosomal loci are heterochromatic. Histone methyltransferases and the chromatin remodeling protein DDM1 control subtelomeric heterochromatin formation. Whereas histone methyltransferases are required for histone H3K9 2Me and non-CpG DNA methylation, DDM1 directs CpG methylation but not H3K9 2Me or non-CpG methylation. These results argue that both kinds of proteins participate in different pathways to reinforce subtelomeric heterochromatin formation.
显示更多 [+] 显示较少 [-]Ministerio de Educación Ciencia BFU2004-01560/BMC, BFU2008-02497/BMC y GEN2003-20859-C03-03/INTER
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