Stepwise Progression of Embryonic Patterning

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• 作者：Jeremy E. Sandler¹ ; Angelike Stathopoulos¹ ; ^{angelike@caltech.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dorsal transcription factor ; Drosophila embryo ; dorsal&ndash ; ventral patterning ; dynamics ; morphogen gradients ; spatiotemporal gene expression
• 刊名：Trends in Genetics
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：32
• 期：7
• 页码：432-443
• 全文大小：2184 K

文摘

It is long established that the graded distribution of Dorsal transcription factor influences spatial domains of gene expression along the dorsoventral (DV) axis of Drosophila melanogaster embryos. However, the more recent realization that Dorsal levels also change with time raises the question of whether these dynamics are instructive. An overview of DV axis patterning is provided, focusing on new insights identified through quantitative analysis of temporal changes in Dorsal target gene expression from one nuclear cycle to the next (‘steps’). Possible roles for the stepwise progression of this patterning program are discussed including (i) tight temporal regulation of signaling pathway activation, (ii) control of gene expression cohorts, and (iii) ensuring the irreversibility of the patterning and cell fate specification process.