Abstract
Studies in organisms belonging to different eukaryotic kingdoms have revealed that the structural state of chromatin is controlled by interactions of DNA, small RNAs and specific proteins, linked to a self-reinforcing complex network of biochemical activities involving histone and DNA modifications and ATP-dependent nucleosome remodeling. However, these findings must now be reinterpreted in light of the recent discovery of the highly dynamic character of interphase chromosomes exemplified by the constant flux of enzymatic and structural proteins through both eu- and heterochromatin and by short- and long-range chromosome movements in the nucleus. The available data on chromosome organization in Arabidopsis thaliana and links between proteins influencing chromatin structure and DNA and histone modifications documented in this model plant provide strong supportive evidence for the dynamic nature of chromosomes.
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