The acetyllysine reader BRD3R promotes human nuclear reprogramming and regulates mitosis

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Abstract

It is well known that both recipient cells and donor nuclei demonstrate a mitotic advantage as observed in the traditional reprogramming with somatic cell nuclear transfer (SCNT). However, it is not known whether a specific mitotic factor plays a critical role in reprogramming. Here we identify an isoform of human bromodomain-containing 3 (BRD3), BRD3R (BRD3 with Reprogramming activity), as a reprogramming factor. BRD3R positively regulates mitosis during reprogramming, upregulates a large set of mitotic genes at early stages of reprogramming, and associates with mitotic chromatin. Interestingly, a set of the mitotic genes upregulated by BRD3R constitutes a pluripotent molecular signature. The two BRD3 isoforms display differential binding to acetylated histones. Our results suggest a molecular interpretation for the mitotic advantage in reprogramming and show that mitosis may be a driving force of reprogramming.

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Shao, Z., Zhang, R., Khodadadi-Jamayran, A., Chen, B., Crowley, M. R., Festok, M. A., … Hu, K. (2016). The acetyllysine reader BRD3R promotes human nuclear reprogramming and regulates mitosis. Nature Communications, 7. https://doi.org/10.1038/ncomms10869

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