Abstract
In all organisms DNA is maintained in a highly compacted state complexed with abundant basic proteins. The extent of this compaction can range from ∼1,000-fold in the bacterial nucleoid to ∼10,000-fold in eukaryotic metaphase chromosomes. In addition to the necessity for compaction the genetic specification function of DNA also requires that the appropriate encoded information be accessible for transcription. The dual requirements of compaction and selective accessibility imply that the complex of DNA and abundant basic proteins, defined here generally as chromatin, must possess a high degree of structural organisation and that the regulation of transcription at the level of the gene may involve substantial structural transitions. In this article we summarise the current understanding of the organisation of eukaryotic chromatin and discuss the extent to which the organisational principles are also apparent in prokaryotic chromatin.
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We thank Dr. Malcolm Buckle for incisive comments.
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Travers, A., Muskhelishvili, G. (2010). The Topology and Organization of Eukaryotic Chromatin. In: Dame, R.T., Dorman, C.J. (eds) Bacterial Chromatin. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3473-1_11
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