Tuesday, March 4, 2014
whereas the significance of the results in vivo was determined by the Mann Whitn
Good ApoG2 percent of EZH2 target genes did not be repressed by expression of the siRNA proof EZH2T350A mutant. Likewise, we found that more than 74percent of EZH2 repressed genes are not repressed when EZH2T350A is expressed in normal human BJ fibroblasts. Intriguingly, nearly all Thr 350 phosphorylation regulated EZH2 targeted genes were also afflicted with treatment in LNCaP cells, although, needlessly to say, roscovitine treatment triggered significantly bigger affect gene-expression. We conclude that CDK induced Thr 350 phosphorylation of EZH2 is important for the genome wide repression of gene transcription. The HOXA9 gene is well studied EZH2 repression target1,18,24.
To determine whether EZH2 phosphorylation at Thr 350 impacts HOXA9 expression, endogenous EZH2 was knocked down or restored by ectopic expression of siRNA proof wild type EZH2 or EZH2T350A utilizing the technique Eumycetoma shown in Figure 3a and Supplementary Information, Amount S3b. As expected, knockdown of endogenous EZH2 resulted in an increase in expression in LNCaP cells. HOXA9 expression was repressed again by restored expression of wildtype EZH2. However, this result was significantly affected from the expression of EZH2T350A. Over-Expression of CDK2 cyclin E and CDK1 cyclin B1 also repressed HOXA9 gene-expression. This effect was abrogated by EZH2 knockdown. Additionally, silencing of endogenous CDK1 and CDK2 elevated expression of HOXA9. No additive influence on expression was seen in cells where CDK1, CDK2 and EZH2 were knocked-down.
Knock-Down of EZH2 greater DAB2IP expression in LNCaP cells, in line with earlier reports that the putative tumor suppressor gene DAB2IP is EZH2 target14,27. This increase was declined by expression of wild-type EZH2 although not the EZH2T350A JQ1 mutant. In addition to HOXA9, a number of other important developmental regulators, including transcription factors while in the SOX, Monk and HOX households, are known targets of PRC211. Our microarray data shown that Thr 350 phosphorylation is very important for EZH2 mediated repression of many of the genes. These data indicate that Thr 350 phosphorylation of EZH2 is vital for its repression of genes often mediating difference or blocking cell growth and migration. EZH2 marketed gene silencing is mediated primarily by its purpose in catalysing H3K27me3 inside the promoters of its targeted genes1,18,24.
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