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Totipotency in the absence of CAF-I: unhindered choices when the chaperone is out

机译:没有CAF-I时的全能性:陪伴分子时不受阻碍的选择

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Embryonal totipotent cells can produce both embryonic and extraembryonic tissues and can generate whole organisms. In mice this level of genome plasticity is preserved in the 2-cell embryos, but is absent in embryonic cells from later stages of development. Recently it has been demonstrated that totipotent-like cells spontaneously appear in embryonic stem cell cultures and that the depletion of the histone chaperone Chromatin Assembly Factor I (CAF-I) increases the abundance of 2cell-like cells. On the other hand, earlier studies have demonstrated that CAF-I is necessary for epigenetic conversions at the telomeres of S. cerevisiae. This commentary proposes that the absence of CAF-I confers totipotency of embryonic cells and that its activation triggers chromatin changes that reset the epigenome toward cell differentiation.
机译:胚胎全能细胞可以产生胚胎和胚外组织,并可以产生完整的生物。在小鼠中,这种水平的基因组可塑性保留在2细胞胚胎中,但发育后期的胚胎细胞中却不存在。最近,已经证明全能样细胞自发出现在胚胎干细胞培养物中,组蛋白伴侣染色质染色质组装因子I(CAF-1)的消耗增加了2细胞样细胞的丰度。另一方面,较早的研究表明,CAF-1对于酿酒酵母端粒的表观遗传转化是必需的。该评论提出,CAF-1的缺失会赋予胚胎细胞全能性,并且其激活会触发染色质变化,从而使表观基因组朝着细胞分化的方向复位。

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