在发育过程中不适当的p53激活会诱导CHARGE综合征的特征
Jeanine L Van Nostrand1, Colleen A Brady2, Heiyoun Jung1
1Department of Radiation Oncology, Division of Radiation and Cancer Biology, Stanford University School of Medicine, Stanford, California 94305, USA.
Nature
|August 15, 2014
概括
在发育过程中瘤抑制剂p53的不适当激活会导致CHARGE综合征表型. 这一发现揭示了p53在发育障碍中的关键作用,并为CHARGE综合征机制提供了新的见解.
科学领域:
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 查奇综合征是一种复杂的疾病,具有多种表型,通常与CHD7基因突变有关.
- 驱动CHARGE综合征表型的精确分子途径在很大程度上是未知的.
- 瘤抑制蛋白p53 (也称为Trp53) 在细胞循环调节和亡中起着至关重要的作用.
研究的目的:
- 为了研究瘤抑制蛋白p53在CHARGE综合征的发病过程中的作用.
- 探索CHD7和p53在发育过程中的关系.
- 为了确定CHARGE综合征的潜在治疗点.
主要方法:
- 一种表达稳定,转录死亡的p53变体 (p53(25,26,53,54) 与野生类型的p53等位基因相结合的敲入小鼠模型的生成和分析.
- 在突变小鼠胚胎中对胚胎死亡率和表型特征的评估.
- 调查CHD7与p53促进体的相互作用,并分析p53激活反应CHD7损失在小鼠神经细胞和患者样本.
- 评估p53异性对Chd7-null小鼠胚胎中CHARGE类表型的影响.
主要成果:
- 一种特定的p53突变 (p53(25,26,53,54)) 诱导了妊娠后期的胚胎死亡,具有类似CHARGE综合征的表型,包括大肠瘤,耳部形,心脏缺陷和面异常.
- 突变的p53过度激活野生类型的p53,导致不适当的细胞循环停止或在发育过程中的亡.
- CHD7通过与其促进体结合来负面调节p53的表达;在小鼠模型和CHARGE综合征患者中,CHD7的丧失导致了p53的激活.
- 通过p53异性对Chd7-null小鼠胚胎表型的部分救援表明p53对CHARGE综合征病原体的贡献.
结论:
- 在胚胎发育期间不适当的p53激活是CHARGE综合征表型的重要贡献者.
- 失去了CHD7导致p53的激活,这意味着这条路径在CHARGE综合征.
- p53在发育综合征中发挥着关键作用,为CHARGE综合征机制和潜在的治疗策略提供了新的见解.
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