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FEBS Lett. 2012 Sep 21;586(19):3448-51. doi: 10.1016/j.febslet.2012.07.066. Epub 2012 Jul 28.

A687V EZH2 is a gain-of-function mutation found in lymphoma patients.

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Epizyme, Inc., 325 Vassar St., Cambridge, MA 02139, USA.


Heterozygous point mutations at Y641 and A677 in the EZH2 SET domain are prevalent in about 10-24% of Non-Hodgkin lymphomas (NHL). Previous studies indicate that these are gain-of-function mutations leading to the hypertrimethylation of H3K27. These EZH2 mutations may drive the proliferation of lymphoma and make EZH2 a molecular target for patients harboring these mutations. Here, another EZH2 SET domain point mutation, A687V, occurring in about 1-2% of lymphoma patients, is also shown to be a gain-of-function mutation that greatly enhances its ability to perform dimethylation relative to wild-type EZH2 and is equally proficient at catalyzing trimethylation. We propose that A687V EZH2 also leads to hypertrimethylation of H3K27 and may thus be a driver mutation in NHL.

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