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Deconstructing the complexity of regulating common properties in different cell types: lessons from the delilah gene.

Dev. Biol.2015 Jul 15;403(2):180-91. Epub 2015 May 16
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摘要


To understand development we need to understand how transcriptional regulatory mechanisms are employed to confer different cell types with their unique properties. Nonetheless it is also critical to understand how such mechanisms are used to confer different cell types with common cellular properties, such as the ability to adhere to the extracellular matrix. To decode how adhesion is regulated in cells stemming from different pedigrees we analyzed the regulatory region that drives the expression of Dei, which is a transcription factor that serves as a central determinant of cell adhesion, particularly by inducing expression of βPS-integrin. We show that activation of dei transcription is mediated through multiple cis regulatory modules, each driving transcription in a spatially and temporally restricted fashion. Thus the dei gene provides a molecular platform through which cell adhesion can be regulated at the transcriptional level in different cellular milieus. Moreover, we show that these regulatory modules respond, often directly, to central regulators of cell identity in each of the dei-expressing cell types, such as D-Mef2 in muscle cells, Stripe in tendon cells and Blistered in wing intervein cells. These findings suggest that the acquirement of common cellular properties shared by different cell types is embedded within the unique differentiation program dictated to each of these cells by the major determinants of its identity.

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