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通过神经细胞命运调节器对连续不平等细胞分裂的控制决定了胚胎神经细胞细胞大小
Thomas W Mullan1, Terry Felton1, Janis Tam1
1Department of Cell and Developmental Biology, University College London, London WC1E 6BT, UK.
概括
在Caenorhabditis elegans中,两个不平等的细胞分裂不会影响细胞命运的规范. 相反,let-19/MDT13和hlh-14/ASCL1调节神经细胞的身份和细胞大小.
科学领域:
- 发展生物学 发展生物学
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 不对称的细胞分裂产生不同尺寸和不同的命运的子细胞.
- 细胞大小不对称性在细胞命运决定和胚胎发育中的作用受到辩论.
- 在C. elegans血统中,两个不平等的细胞分裂先于神经细胞形成.
研究的目的:
- 为了研究不平等的细胞分裂在神经细胞形成中的作用.
- 确定细胞大小不对称是否是神经细胞特异性的先决条件.
- 为了确定神经细胞细胞大小和身份的调节者.
主要方法:
- 使用Caenorhabditis elegans作为一个模型生物.
- 采用猪-1/MELK突变分析来平衡细胞分裂.
- 研究了let-19/MDT13和hlh-14/ASCL1在神经细胞发育中的功能.
主要成果:
- 在猪-1/MELK突变体中平衡细胞分裂对神经细胞特异性的影响很小.
- 鉴定出let-19/MDT13是前神经转录因子hlh-14/ASCL1.1的调节剂.
- 无论是let-19/MDT13还是hlh-14/ASCL1,都对同时调节神经细胞的身份和细胞大小至关重要.
结论:
- 胚胎神经细胞细胞大小由关键的神经细胞命运调节器逐渐调节,与身份平行.
- 细胞命运的决定因素可能在调节不平等的分裂和原始细胞大小方面发挥着不被重视的作用.
- 这表明在发育过程中建立细胞身份和大小的协调机制.
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