Regulation of spindle orientation and neural stem cell fate in the Drosophila optic lobe.

Regulation of spindle orientation and neural stem cell fate in the Drosophila optic lobe.
复制标题

果蝇视神经叶中主轴取向和神经干细胞命运的调节。

DOI:
10.1186/1749-8104-2-1
复制
发表时间:
2007-01-05
期刊:
影响因子:
3.6
通讯作者:
Doe CQ
Doe CQ
中科院分区:
生物学3区
文献类型:
--
作者:
Egger B;Boone JQ;Stevens NR;Brand AH;Doe CQ

文献摘要

参考文献

被引文献

相似文献

干细胞选择对称分裂还是不对称分裂对发育和疾病具有深远影响。不受调控的对称分裂会促进肿瘤形成,而不恰当的不对称分裂会影响器官形态发生。尽管其重要性不言而喻,但人们对纺锤体定位是如何调控的却知之甚少。在一些组织中,细胞命运似乎决定了细胞分裂的类型,而在其他组织中,人们认为纺锤体位置的随机变化决定了后续同胞细胞的命运。 在此,我们研究了果蝇视叶中神经祖细胞特性与纺锤体定位之间的关系。我们利用分子标记和实时成像技术表明,视叶中存在两类祖细胞:对称分裂的神经上皮细胞和不对称分裂的成神经细胞。我们利用基因标记的单细胞克隆表明神经上皮细胞可产生成神经细胞。为了确定纺锤体方向的改变是否能引发神经上皮细胞向成神经细胞的转变,我们通过错误表达无刚毛蛋白(Inscuteable)迫使神经上皮细胞沿其顶 - 基轴分裂。我们发现这既不会诱导产生成神经细胞,也不会促进神经元过早分化。 我们表明在视叶中对称分裂的神经上皮细胞可产生不对称分裂的成神经细胞,并且纺锤体方向和分裂对称性的调控是细胞类型特化的结果,而非产生细胞类型多样性的机制。
The choice of a stem cell to divide symmetrically or asymmetrically has profound consequences for development and disease. Unregulated symmetric division promotes tumor formation, whereas inappropriate asymmetric division affects organ morphogenesis. Despite its importance, little is known about how spindle positioning is regulated. In some tissues cell fate appears to dictate the type of cell division, whereas in other tissues it is thought that stochastic variation in spindle position dictates subsequent sibling cell fate. Here we investigate the relationship between neural progenitor identity and spindle positioning in the Drosophila optic lobe. We use molecular markers and live imaging to show that there are two populations of progenitors in the optic lobe: symmetrically dividing neuroepithelial cells and asymmetrically dividing neuroblasts. We use genetically marked single cell clones to show that neuroepithelial cells give rise to neuroblasts. To determine if a change in spindle orientation can trigger a neuroepithelial to neuroblast transition, we force neuroepithelial cells to divide along their apical/basal axis by misexpressing Inscuteable. We find that this does not induce neuroblasts, nor does it promote premature neuronal differentiation. We show that symmetrically dividing neuroepithelial cells give rise to asymmetrically dividing neuroblasts in the optic lobe, and that regulation of spindle orientation and division symmetry is a consequence of cell type specification, rather than a mechanism for generating cell type diversity.
DOI: 10.1007/bf00333712
发表时间: 1993-09-01
影响因子: 3.6
作者:
GREEN, P;HARTENSTEIN, AY;HARTENSTEIN, V
通讯作者: HARTENSTEIN, V
DOI: 10.1073/pnas.0308600100
发表时间: 2004-03-02
影响因子: 11.1
作者:
Haubensak, W;Attardo, A;Huttner, WB
通讯作者: Huttner, WB
DOI: 10.1101/gad.6.11.2137
发表时间: 1992-11-01
影响因子: 10.5
作者:
BIER, E;VAESSIN, H;JAN, YN
通讯作者: JAN, YN
DOI: 10.1038/37641
发表时间: 1997-12-11
期刊: NATURE
影响因子: 64.8
作者:
IkeshimaKataoka, H;Skeath, JB;Matsuzaki, F
通讯作者: Matsuzaki, F
DOI: 10.1016/0092-8674(95)90035-7
发表时间: 1995-08-25
期刊: CELL
影响因子: 64.5
作者:
CHENN, A;MCCONNELL, SK
通讯作者: MCCONNELL, SK