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2014 ; 289
(23
): 16016-31
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The RUNX2 cistrome in osteoblasts: characterization, down-regulation following
differentiation, and relationship to gene expression
#MMPMID24764292
Meyer MB
; Benkusky NA
; Pike JW
J Biol Chem
2014[Jun]; 289
(23
): 16016-31
PMID24764292
show ga
RUNX2 is a transcription factor that is first expressed in early
osteoblast-lineage cells and represents a primary determinant of
osteoblastogenesis. While numerous target genes are regulated by RUNX2, little is
known of sites on the genome occupied by RUNX2 or of the gene networks that are
controlled by these sites. To explore this, we conducted a genome-wide analysis
of the RUNX2 cistrome in both pre-osteoblastic MC3T3-E1 cells (POB) and their
mature osteoblast progeny (OB), characterized the two cistromes and assessed
their relationship to changes in gene expression. We found that although RUNX2
was widely bound to the genome in POB cells, this binding profile was reduced
upon differentiation to OBs. Numerous sites were lost upon differentiation, new
sites were also gained; many sites remained common to both cell states.
Additional features were identified as well including location relative to
potential target genes, abundance with respect to single genes, the frequent
presence of a consensus TGTGGT RUNX2 binding motif, co-occupancy by C/EBP? and
the presence of a typical epigenetic histone enhancer signature. This signature
was changed quantitatively following differentiation. While RUNX2 binding sites
were associated extensively with adjacent genes, the distal nature of the
majority of these sites prevented assessment of whether they represented direct
targets of RUNX2 action. Changes in gene expression, however, revealed an
abundance of genes that contained RUNX2 binding sites and were regulated in
concert. These studies establish a basis for further analysis of the role of
RUNX2 activity and its function during osteoblast lineage maturation.