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Unité des Virus Oncogènes, UA1644 du Centre National de la Recherche Scientifique, Département des Biotechnologies,
Institut Pasteur, 75724 Paris, France
Biochemical and genetic evidence suggest
that the SWI/SNF complex is involved in the remodeling of chromatin during gene activation. We have used
antibodies specific against three human subunits of this
complex to study its subnuclear localization, as well as
its potential association with active chromatin and the
nuclear skeleton. Immunofluorescence studies revealed
a punctate nuclear labeling pattern that was excluded
from the nucleoli and from regions of condensed chromatin. Dual labeling failed to reveal significant colocalization of BRG1 or hBRM proteins with RNA polymerase II or with nuclear speckles involved in splicing.
Chromatin fractionation experiments showed that both
soluble and insoluble active chromatin are enriched in
the hSWI/SNF proteins as compared with bulk chromatin. hSWI/SNF proteins were also found to be associated with the nuclear matrix or nuclear scaffold, suggesting that a fraction of the hSWI/SNF complex could
be involved in the chromatin organization properties
associated with matrix attachment regions.
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