不对称细胞分裂以缺口依赖性方式产生ATH5 +祖细胞。(a)28 HPF的视网膜(绿色)中的马赛克Ath5表达的示意图。注射ATH5:1个细胞阶段的GFP-CAAX构建体。(b)关于ATH5表达发病的非对称多能祖母划分的实例。HSP70:H2B-RFP(核,灰色),HSP70:MKATE2-RAS(细胞膜,灰色),ATH5:GFP-CAAX(ATH5,绿色)。虚线显示视网膜神经脑膜炎的顶端和基底侧面。秤杆,10μm。洋红色和黄点标签姐妹细胞。(C-C')关于ATH5表达的多能祖细胞的示意图除去不对称(c)或对称(c')。(d)在实时成像实验中观察到不对称VS对称分裂的分布。 N = number of embryos, n = number of divisions. (E) Ath5+ cells (grey) at 36 hpf in control (left) vs Notch inhibition (right). Scale bar, 50 μm. The yellow line delimits the apical side of the retinal neuroepithelium. (F) Ath5+ cells (grey) at 48 hpf in control (left) vs Notch inhibition (right). Scale bar, 50 μm. The yellow line delimits the apical side of the retinal neuroepithelium. (G) Schematic of retinal neuroepithelium measurements at 48 hpf, (G’) retinal thickness control vs Notch inhibition, (G’’) retinal diameter control vs Notch inhibition. Mann-Whitney test used for comparison. Vertical bars represent standard deviation. (H) Example of symmetric progenitor division upon Notch inhibition. hsp70:H2B-RFP (nuclei, grey), ath5:GFP-CAAX (Ath5, green). Dashed lines show apical and basal sides of the retinal neuroepithelium. Scale bar, 10 μm. Magenta and yellow dots label sister cells. (I) Distribution of asymmetric vs symmetric divisions observed in live imaging experiments in Notch inhibition compared to controls.
德国德累斯顿的马克斯·普朗克分子细胞生物学和遗传学研究所(Instituto Gulbenkian de Ciência)的研究人员发现,在发育中的视网膜和中枢神经系统的重要部分,导致第一批分化神经元的分裂是不对称的,而这种不对称对于以正确的数量和比例生成正确类型的神经元是必要的。
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