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2017 ; 8
(1
): 649
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Modular fluorescence complementation sensors for live cell detection of
epigenetic signals at endogenous genomic sites
#MMPMID28935858
Lungu C
; Pinter S
; Broche J
; Rathert P
; Jeltsch A
Nat Commun
2017[Sep]; 8
(1
): 649
PMID28935858
show ga
Investigation of the fundamental role of epigenetic processes requires methods
for the locus-specific detection of epigenetic modifications in living cells.
Here, we address this urgent demand by developing four modular fluorescence
complementation-based epigenetic biosensors for live-cell microscopy
applications. These tools combine engineered DNA-binding proteins with domains
recognizing defined epigenetic marks, both fused to non-fluorescent fragments of
a fluorescent protein. The presence of the epigenetic mark at the target DNA
sequence leads to the reconstitution of a functional fluorophore. With this
approach, we could for the first time directly detect DNA methylation and histone
3 lysine 9 trimethylation at endogenous genomic sites in live cells and follow
dynamic changes in these marks upon drug treatment, induction of epigenetic
enzymes and during the cell cycle. We anticipate that this versatile technology
will improve our understanding of how specific epigenetic signatures are set,
erased and maintained during embryonic development or disease onset.Tools for
imaging epigenetic modifications can shed light on the regulation of epigenetic
processes. Here, the authors present a fluorescence complementation approach for
detection of DNA and histone methylation at endogenous genomic sites allowing
following of dynamic changes of these marks by live-cell microscopy.