凝聚素通过CCCTC-结合因子调节转录绝缘
Kerstin S Wendt1, Keisuke Yoshida, Takehiko Itoh
1Research Institute of Molecular Pathology, Dr. Bohr Gasse 7, 1030 Vienna, Austria.
Nature
|February 1, 2008
概括
凝聚蛋白是一种蛋白质复合体,通过与CTCF合作来调节基因表达,作为转录绝缘体. 这一功能,独立于细胞分裂,可能会在像康奈莉亚·德朗格综合征这样的凝聚性病变中受损.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 凝聚素复合体以它们在细胞分裂期间的姐妹染色体凝聚力中的作用而闻名.
- 新出现的证据表明,凝聚素也可能在非分裂细胞的基因调节中发挥作用.
- 凝聚素影响基因表达的确切机制在很大程度上是未知的.
研究的目的:
- 为了确定人类基因组中的凝聚素结合部位.
- 阐明凝聚素,CTCF和基因调节之间的关系.
- 为了研究凝聚素在转录绝缘中的作用.
主要方法:
- 凝聚素结合位点的全基因组识别.
- 分析凝聚素与CCCTC结合因子 (CTCF) 之间的关联.
- 在H19/IGF2位点进行功能研究,以评估凝聚素的调节作用.
主要成果:
- 大多数凝聚素结合部位与已知的转录绝缘体CTCF有关.
- 对于丰富特定基因组位置的凝聚力来说,CTCF是必要的,但不是用于其初始加载.
- 凝聚素促进CTCF介导的促进体与增强剂的隔离,并控制H19/IGF2位点的转录.
结论:
- 凝聚素作为转录绝缘体的功能,独立于它在姐妹染色体凝聚力的作用.
- 这种新描述的凝聚素功能是通过其与CTCF的相互作用来实现的.
- 凝聚素的绝缘体功能的缺陷可能导致凝聚素病变,如康奈莉亚·德朗格综合征.
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