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Oxidative Medicine and Cellular Longevity
Volume 2013, Article ID 437146, 9 pages
Research Article

Saccharomyces cerevisiae Linker Histone—Hho1p Maintains Chromatin Loop Organization during Ageing

Laboratory of Yeast Molecular Genetics, “Acad. Roumen Tsanev” Institute of Molecular Biology, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Street, Building 21, 1113 Sofia, Bulgaria

Received 10 May 2013; Revised 5 July 2013; Accepted 8 July 2013

Academic Editor: Cristina Mazzoni

Copyright © 2013 Katya Uzunova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Intricate, dynamic, and absolutely unavoidable ageing affects cells and organisms through their entire lifetime. Driven by diverse mechanisms all leading to compromised cellular functions and finally to death, this process is a challenge for researchers. The molecular mechanisms, the general rules that it follows, and the complex interplay at a molecular and cellular level are yet little understood. Here, we present our results showing a connection between the linker histones, the higher-order chromatin structures, and the process of chronological lifespan of yeast cells. By deleting the gene for the linker histone in Saccharomyces cerevisiae we have created a model for studying the role of chromatin structures mainly at its most elusive and so far barely understood higher-order levels of compaction in the processes of yeast chronological lifespan. The mutant cells demonstrated controversial features showing slower growth than the wild type combined with better survival during the whole process. The analysis of the global chromatin organization during different time points demonstrated certain loss of the upper levels of chromatin compaction in the cells without linker histone. The results underlay the importance of this histone for the maintenance of the chromatin loop structures during ageing.