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【分享】WDR82在早期胚胎發(fā)育中的重要作用
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WDR82, a key epigenetics related factor, plays crucial role in normal early embryonic development WDR82在早期胚胎發(fā)育中的重要作用 Jiahao Sha Biolreprod December 1, 2010 摘要:Epigenetic regulation is considered one of the most important mechanisms by which changes in gene expression occur without changes in the underlying DNA sequence. More and more studies have shown that this kind of regulation plays a very important role during the process of early embryonic development. Methylation of histones is a special process in epigenetic regulations that plays a duel role, some activate the gene expression while some inhibit; tri-methylation of histone 3 lysine 4 has been shown to be a marker of gene expression activation. Previous researches have led us to focus on the role of WDR82, which has been shown to recognize a subunit in the methyltransferases complex that catalyzes H3K4me3 in early embryonic development. Although it has been shown that a defect in WDR82 causes dysfunction of SETD1A/SETD1B and results in loss of H3K4me3 in human cell lines, the exact role of WDR82 in the methyltransferases complex during early embryonic development is not clear. Our study has shown that a defect in WDR82 causes dysfunction of SETD1A/SETD1B and affects the normal H3K4me3 status in the transcription start region of POU5F1, which then causes the down-regulation of POU5F1, as well as its downstream factors, STAT3/BIRC5, which are responsible for the extremely high apoptotic rates of blastocysts. Finally, the result of a blocked WDR82 consists of stunted embryonic development and death. Thus, WDR82 can be considered a key epigenetic regulation-related factor crucial in the normal growth and development of embryos. 摘要 1:表觀遺傳學調控,是在DNA序列沒有變化的情況下,對基因表達進行調控的一種重要手段。我們認為,該種調控在胚胎的早期發(fā)育中起著重要作用。 2:組氨酸的甲基化作為其中的一種,可以啟動一些基因的表達,也可以沉默一些基因的表達;H3K4me3,對組蛋白3的4號賴氨酸位點進行三重甲基化作用,是基因表達活化的一種標志性作用。 3:前期研究表示,WDR82作為甲基化轉移酶復合體的組件之一,參與早期胚胎發(fā)育中,H3K4me3作用的催化。雖然,已經研究出WDR82的缺失可以引起SETD1A/SETD1B 的功能紊亂及在人類細胞水平上H3K4me3的缺失,但其在甲基化轉移酶復合體中的具體相關作用仍不明了。 4:本實驗研究表明:WDR82的缺失導致SETD1A/SETD1B功能紊亂;通過影響pou5f1的轉錄,從而影響其調控的下游因子,如STAR3/BIRC5,導致了胚胎發(fā)育阻滯及死亡。所以,表觀遺傳調控的相關因子,WDR82,對胚胎的早期發(fā)育及分化起著重要作用。 更多資料請查看www.bioknow.cn |
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