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J. Biol. Chem., Vol. 276, Issue 41, 38307-38319, October 12, 2001
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From the Histone acetylation, a reversible modification of
the core histones, is widely accepted to be involved in remodeling
chromatin organization for genetic reprogramming. Histone acetylation
is a dynamic process that is regulated by two classes of enzymes, the
histone acetyltransferases (HATs) and histone deacetylases (HDACs).
Although promoter-specific acetylation and deacetylation has received
most of the recent attention, it is superimposed upon a broader acting
and dynamic acetylation that profoundly affects many nuclear processes.
In this study, we monitored this broader histone acetylation as cells
enter and exit mitosis. In contrast to the hypothesis that HATs and
HDACs remain bound to mitotic chromosomes to provide an epigenetic
imprint for postmitotic reactivation of the genome, we observed that
HATs and HDACs are spatially reorganized and displaced from condensing
chromosomes as cells progress through mitosis. During mitosis, HATs and
HDACs are unable to acetylate or deacetylate chromatin in
situ despite remaining fully catalytically active when isolated
from mitotic cells and assayed in vitro. Our results
demonstrate that HATs and HDACs do not stably bind to the genome to
function as an epigenetic mechanism of selective postmitotic gene
activation. Our results, however, do support a role for spatial
organization of these enzymes within the cell nucleus and their
relationship to euchromatin and heterochromatin postmitotically in the
reactivation of the genome.
Research Institute, The Hospital for Sick
Children, Toronto, Ontario M5G 1X8, Canada, the ¶ Gladstone
Institute for Virology and Immunology, University of California, San
Francisco, California 94103, and the ** Molecular Oncology
Group, Department of Medicine, McGill University Health Centre,
Montreal, Quebec H3A 1A1, Canada
Supported by the Boehringer Ingelheim Foundation (Germany).

To whom correspondence should be addressed: Dr. David P. Bazett-Jones, Research Institute, The Hospital for Sick Children, 555 Univ. Ave., Toronto, ON M5G 1X8, Canada. Tel.: 416-813-2181; Fax:
416-813-5028; E-mail: dbjones@sickkids.ca.
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