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2016 ; 62
(5
): 665-7
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Chromatin Scanning by Dynamic Binding of Pioneer Factors
#MMPMID27259199
Zaret KS
; Lerner J
; Iwafuchi-Doi M
Mol Cell
2016[Jun]; 62
(5
): 665-7
PMID27259199
show ga
Pioneer factors such as FoxA target nucleosomal DNA and initiate cooperative
interactions at silent genes during development, cellular reprogramming, and
steroid hormone induction. Biophysical studies previously showed that the nuclear
mobility of FoxA1 is slower than for many other transcription factors, whereas a
new single molecule study (Swinstead et al., 2016, Cell) shows comparable
chromatin residence times for FoxA1 and steroid receptors. Despite that steroid
receptors engage nucleosome-remodeling complexes, the vast majority of co-bound
sites with FoxA are dependent upon FoxA, not vice versa. Taken together, the
distinguishing feature of pioneer factors remains nucleosomal access rather than
an exceptional residence time in chromatin.