Asymmetric cell divisions are concentrated in the dermomyotome dorsomedial lip during epaxial primary myotome morphogenesis

Asymmetric cell divisions are concentrated in the dermomyotome dorsomedial lip during epaxial primary myotome morphogenesis
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在外轴初级肌节形态发生过程中,不对称细胞分裂集中在真皮肌节背内侧唇中

DOI:
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发表时间:
2005
期刊:
Anatomy and Embryology
影响因子:
--
通讯作者:
C. Ordahl
C. Ordahl
中科院分区:
--
文献类型:
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作者:
S. Venters;C. Ordahl

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为了确定是否可以通过有丝分裂行为的内在差异来鉴定体节干细胞池,分析了真皮肌节上皮中有丝分裂的方向。我们描述了一个浓度的apico-basal有丝分裂在dermomyotome背内侧唇(DML)。顶端-基底分裂的发生与notch途径因子数的不对称定位密切相关,因此可以将这种分裂描述为不对称。相反,发生在上皮平面上的平面分裂是对称的。此外,我们表明,DML环境生态位是足够的,以促进麻木的表达在epaxial dermomyotome组织,通常不表达这种因素。这些数据首次提供了一个非回顾性的机制跟踪分析,通过该机制,DML实现了干细胞库的作用,它在轴向原发性肌节形态发生。
To determine if somitic stem cell pools could be identified by an intrinsic difference in mitotic behaviour, the orientation of mitoses in the dermomyotome epithelium was analysed. We describe a concentration of apico-basal mitoses within the dermomyotome dorsomedial lip (DML). The occurrence of apico-basal divisions is closely associated with asymmetric localisation of the notch pathway factor numb, allowing description of such divisions as asymmetric. In contrast, planar divisions, occurring in the plane of the epithelium, are symmetric. Further, we show that the DML environmental niche is sufficient to promote numb expression in epaxial dermomyotome tissue that does not normally express this factor. These data provide, for the first time, a non-retrospective tracing analysis of the mechanism by which the DML fulfils the stem-cell pool role it plays during epaxial primary myotome morphogenesis.
DOI: 10.1016/s1534-5807(02)00254-x
发表时间: 2002-09-01
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影响因子: 11.8
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