Robust control of mitotic spindle orientation in the developing epidermis.
Robust control of mitotic spindle orientation in the developing epidermis.
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DOI:
10.1083/jcb.201008001
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发表时间:
2010-11-29
期刊:
影响因子:
--
通讯作者:
Lechler T
中科院分区:
文献类型:
--
作者:
Poulson ND;Lechler T
The precise balance of spindle orientations required for proper epidermal morphogenesis is regulated by mInscuteable expression and NuMA localization. Progenitor cells must balance self-amplification and production of differentiated progeny during development and homeostasis. In the epidermis, progenitors divide symmetrically to increase surface area and asymmetrically to promote stratification. In this study, we show that individual epidermal cells can undergo both types of division, and therefore, the balance is provided by the sum of individual cells’ choices. In addition, we define two control points for determining a cell’s mode of division. First is the expression of the mouse Inscuteable gene, which is sufficient to drive asymmetric cell division (ACD). However, there is robust control of division orientation as excessive ACDs are prevented by a change in the localization of NuMA, an effector of spindle orientation. Finally, we show that p63, a transcriptional regulator of stratification, does not control either of these processes. These data have uncovered two important regulatory points controlling ACD in the epidermis and allow a framework for analysis of how external cues control this important choice.
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