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2015 ; 16
(1
): 145
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Estrogen-induced chromatin decondensation and nuclear re-organization linked to
regional epigenetic regulation in breast cancer
#MMPMID26235388
Rafique S
; Thomas JS
; Sproul D
; Bickmore WA
Genome Biol
2015[Aug]; 16
(1
): 145
PMID26235388
show ga
BACKGROUND: Epigenetic changes are being increasingly recognized as a prominent
feature of cancer. This occurs not only at individual genes, but also over larger
chromosomal domains. To investigate this, we set out to identify large
chromosomal domains of epigenetic dysregulation in breast cancers. RESULTS: We
identify large regions of coordinate down-regulation of gene expression, and
other regions of coordinate activation, in breast cancers and show that these
regions are linked to tumor subtype. In particular we show that a group of
coordinately regulated regions are expressed in luminal, estrogen-receptor
positive breast tumors and cell lines. For one of these regions of coordinate
gene activation, we show that regional epigenetic regulation is accompanied by
visible unfolding of large-scale chromatin structure and a repositioning of the
region within the nucleus. In MCF7 cells, we show that this depends on the
presence of estrogen. CONCLUSIONS: Our data suggest that the liganded estrogen
receptor is linked to long-range changes in higher-order chromatin organization
and epigenetic dysregulation in cancer. This may suggest that as well as drugs
targeting histone modifications, it will be valuable to investigate the
inhibition of protein complexes involved in chromatin folding in cancer cells.