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Activation of posterior gap gene expression in the Drosophila blastoderm.

机译:果蝇胚盘后间隙基因表达的激活。

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The process of body prepatterning during Drosophila blastoderm formation relies on the localized activities of zygotic segmentation genes, which are controlled by asymmetrically distributed maternal determinants. The anterior determinant bicoid, a homeodomain transcription factor, forms an anterior-to-posterior concentration gradient. It interacts with the maternal transcription factor hunchback to activate the anterior zygotic patterning genes, including the central gap gene Kruppel (Kr). In contrast, the posterior maternal system does not provide such a decisive transcription factor, but rather prevents the repressor hunchback from acting in the posterior half so that the gap genes giant (gt) and knirps (kni) are activated by an as yet unknown transcription factor. Here we show that caudal, a conserved homeodomain protein that forms a posterior-to-anterior concentration gradient, and the anterior determinant bicoid cooperate to form a partly redundant activator system in the posterior region of the embryo.
机译:果蝇胚盘形成过程中的人体预先构图过程依赖于合子分割基因的局部活性,该基因受不对称分布的母体决定簇控制。前决定簇二倍体,一个同源域转录因子,形成一个从前到后的浓度梯度。它与母体转录因子驼背相互作用,以激活前合子模式基因,包括中央缺口基因Kruppel(Kr)。相比之下,后产妇系统不提供这种决定性的转录因子,而是阻止阻遏物驼背在后半部分起作用,从而缺口基因巨人(gt)和knirps(kni)被未知的转录激活因子。在这里,我们显示了尾部,一种保守的同源域蛋白,形成了一个从后到前的浓度梯度,并且与前行决定性双曲线共同作用,在胚胎的后部区域形成了部分冗余的激活系统。

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