Temporal regulation of foregut development by HTZ-1/H2A.Z and PHA-4/FoxA.

Temporal regulation of foregut development by HTZ-1/H2A.Z and PHA-4/FoxA.
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HTZ-1/H2A.Z 和 PHA-4/FoxA 对前肠发育的时间调节。

DOI:
10.1371/journal.pgen.0020161
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发表时间:
2006-09-29
期刊:
影响因子:
4.5
通讯作者:
Mango, Susan E.
Mango, Susan E.
中科院分区:
生物学2区
文献类型:
--
作者:
Updike, Dustin L.;Mango, Susan E.

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组蛋白变体 H2A.Z 在进化上是保守的,在小鼠、果蝇和四膜虫中发挥着重要作用。 H2A.Z 的基本功能尚不清楚,一些研究表明其在转录抑制中发挥作用,而另一些则在激活中发挥作用。在这里,我们展示了秀丽隐杆线虫 HTZ-1/H2A.Z 和重塑复合物 MYS-1/ESA1–SSL-1/SWR1 与 FoxA 转录因子 PHA-4 协同作用,以协调前肠发育过程中的时间基因表达。我们观察到 pha-4 与 htz-1、mys-1 和 ssl-1 之间显着的遗传相互作用。对转录因子的调查表明,这种相互作用是特异性的,因此 pha-4 对这三种蛋白质的减少非常敏感。使用核点测定来可视化活体胚胎中 HTZ-1 随着器官发生的进行,我们发现 HTZ-1 在转录开始时被募集到前肠启动子,并且这种募集需要 PHA-4。 RNAi 造成的 htz-1 损失是致命的,并导致部分前肠基因的表达延迟。因此,PHA-4 对时间调节的影响可以部分地通过将 HTZ-1 募集到目标启动子来解释。我们建议 PHA-4 和 HTZ-1 通过调节染色质环境来协调时间基因表达。在发育过程中,单个受精卵在胚胎内产生不同的细胞类型。这些不同的细胞类型的特征在于它们表达的不同基因。生物学中的一个关键问题是胚胎细胞如何在适当的时间和地点激活基因以产生不同的细胞类型。在本文中,作者探索了器官(即秀丽隐杆线虫前肠)形成过程中基因表达的时间调控。他们发现前肠基因需要经典 H2A 组蛋白的变体才能启动转录。这种变体在秀丽隐杆线虫中被称为 H2A.Z 或 htz-1,通过改变 DNA 在细胞内的包装方式来促进转录。他们的数据表明,前肠发育的关键调节因子转录因子 PHA-4 将 HTZ-1 招募到咽部启动子,这种关联有助于它们的及时激活。
The histone variant H2A.Z is evolutionarily conserved and plays an essential role in mice, Drosophila, and Tetrahymena. The essential function of H2A.Z is unknown, with some studies suggesting a role in transcriptional repression and others in activation. Here we show that Caenorhabditis elegans HTZ-1/H2A.Z and the remodeling complex MYS-1/ESA1–SSL-1/SWR1 synergize with the FoxA transcription factor PHA-4 to coordinate temporal gene expression during foregut development. We observe dramatic genetic interactions between pha-4 and htz-1, mys-1, and ssl-1. A survey of transcription factors reveals that this interaction is specific, and thus pha-4 is acutely sensitive to reductions in these three proteins. Using a nuclear spot assay to visualize HTZ-1 in living embryos as organogenesis proceeds, we show that HTZ-1 is recruited to foregut promoters at the time of transcriptional onset, and this recruitment requires PHA-4. Loss of htz-1 by RNAi is lethal and leads to delayed expression of a subset of foregut genes. Thus, the effects of PHA-4 on temporal regulation can be explained in part by recruitment of HTZ-1 to target promoters. We suggest PHA-4 and HTZ-1 coordinate temporal gene expression by modulating the chromatin environment. During development, a single fertilized egg gives rise to the different cell types within an embryo. These different cell types are characterized by the different genes that they express. A critical question in biology is how embryonic cells activate genes at the appropriate time and place to generate the different cell types. In this paper, the authors explore temporal regulation of gene expression during formation of an organ, namely the Caenorhabditis elegans foregut. They have discovered that foregut genes require a variant of the canonical H2A histone for the onset of transcription. This variant, called H2A.Z, or htz-1 in C. elegans, promotes transcription by modifying how DNA is packaged within cells. Their data suggest that a key regulator of foregut development, the transcription factor PHA-4, recruits HTZ-1 to pharyngeal promoters, and this association contributes to their timely activation.
DOI: 10.1016/s1534-5807(04)00065-6
发表时间: 2004-04-01
期刊: DEVELOPMENTAL CELL
影响因子: 11.8
作者:
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过乙酰化形式的替换组蛋白H2A.Z是鸡肉中活性基因的特征。
DOI: 10.1093/nar/gki874
发表时间: 2005
影响因子: 14.9
作者:
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