Prdm9 (Meisetz) methylates histone H3 dimethylated at lysine-4 to yield histone H3 trimethylated at lysine-4 (Hayashi et al. 2005). The reaction occurs independently of and prior to the formation of double-strand breaks.
Hayashi, K, Yoshida, K, Matsui, Y
histone methyltransferase activity (H3-K4 specific) of PRDM9:DNA Complex [nucleoplasm]
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