EdU (5-ethynyl-2’-deoxyuridine) is a novel alternative for BrdU (5-bromo-2’-deoxyuridine)assay to directly measure active DNA synthesis or S-phase synthesis of the cell cycle. EdU is anucleoside analog of thymidine and is incorporated into DNA during active DNA synthesis.1Detection of EdU is based on a click reaction,1-5 which is a copper (I) catalyzed reactionbetween an azide and an alkyne. The EdU contains the alkyne which can be reacted with thean azide-containing detection reagent, to form a stable, triazole ring (Figure 1).The advantages of the click reaction with EdU labeling are readily evident while performingthe assay. The small size of the detection azide allows the use of mild conditions to accessEdU incorporated into the DNA. This is in contrast to BrdU-based assays that require DNAdenaturation (typically using HCl, heat, or digestion with DNase) to expose the BrdU fordetection with an anti-BrdU antibody (Figure 2). Eliminating the denaturation step allowsfor a simple, fast protocol producing more reproducible results and measurements which areeasily multiplexed with relevant antibody based targets including phospho-histone H3, Ki-67,and cyclin B1 by flow cytometry, fluorescence microscopy, or high-throughput imaging(HCS) (Figures 3 and 4)
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