独立于P53的致病机制有助于BubR1小头症
Noelle A Sterling1,2, Bethany K Terry1,2, Julia M McDonnell1
1Shriners Hospitals Pediatrics Research Center, Department of Neural Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, United States.
马赛克多样化积症 (MVA) 基因Bub1B缺陷通过细胞死亡导致小头症. 即使没有P53,替代细胞死亡途径也会消除异常细胞,揭示出强大的细胞消除机制.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
- 发育神经科学的发展神经科学.
背景情况:
- 马赛克多变形形积分症 (MVA) 与BUDBUB1B基因有关,该基因编码了BUBR1,这是螺旋组装检查点的关键组成部分.
- 人类的BUB1B突变和小鼠的不存在导致小头症,其特征在于由于大规模的细胞死亡而导致神经发生过程中皮质细胞减少.
- 精确的分子和细胞机制驱动这种细胞死亡在BUBR1的缺席仍然在很大程度上是未知的.
研究的目的:
- 调查BubR1缺陷神经祖先细胞死亡的分子和细胞机制.
- 确定P53细胞死亡途径在小鼠模型中观察到的皮质细胞损失中的作用.
- 探索可能独立于P53.3运作的替代细胞死亡机制.
主要方法:
- 在小鼠模型中对线粒体BubR1缺陷的神经原始体进行三维成像分析.
- 在BubR1-缺乏皮层中对Trp53基因的遗传共删除,以评估P53的作用.
- 评价染色体分离,DNA损伤,P53激活和野性,BubR1缺乏和双突变小鼠的细胞死亡.
主要成果:
- 布布R1 缺乏导致神经前中严重的染色体分离缺陷和结构异常.
- 染色体异常和DNA损伤激活P53,导致BubR1突变体的细胞死亡.
- 在缺乏BubR1和P53的小鼠中,仍然存在显著的残留亡细胞死亡,这表明P53独立的亡.
- 在双重突变患者中,皮层大小和神经元数量的最小救援突显了替代细胞死亡途径的有效性.
结论:
- 这项研究阐明了与BUB1B突变相关的MVA患者中小头症的潜在病原机制.
- 它表明存在强大的P53独立细胞死亡机制,在神经发生过程中消除不适合细胞.
- 这些发现揭示了当初级P53介导的亡受损时,维持细胞平衡至关重要的替代途径.
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