Stability of Morphogen GrADIents & Movement of Molecules
In my second lecture I describe experiments using EGFP tagged Bicoid to follow Bcd grADIent establishment in living embryos, and to test various aspects of the simple model. Despite continuous synthesis of new Bcd protein at the anterior end of the egg, we find that the concentration of Bcd in nuclei at any given point along the anterior posterior axis is constant over time and is reproducible from embryo to the next. This reproducibility means that the grADIent is sufficiently robust to provide positional information and thus can accurately direct gene activities. One the other hand, quantitative imaging experiments point to several features of the grADIent that are hard to explain - how target genes activated by Bcd distinguish relatively subtle differences in low concentrations, and how Bcd molecules move from the anterior site of their synthesis to the site of their transcriptional activity. See more at http://www.ibioseminars.org
Genetic Analysis of Mammalian CricADIan Clocks
昼夜节律是一个适应的24小时的一天，我们的经验。一个历史性的概述，Takahashi开始他的演讲如何控制生物钟的基因在drosophi首次发现和克隆旅游所需的力量，以确定在小鼠时钟基因。他还介绍了实验，导致实现人体内的所有细胞都有一个生物钟，而不仅仅是在大脑中的细胞。在这部分讲座中，Takahashi解释说，视交叉上核（SCN）在大脑中产生一种昼夜节律的体温波动的体温反过来，信号到外周组织。热休克因子1是负责的信号分子之一通信温度信息和复位外周时钟。
Molecular Architecture of the CircADIan Clock in Mannals
在这个讲座中，Takahashi介绍了如何穿越不同遗传B许多老鼠背景允许他的实验室识别几个基因通过不同的机制影响时钟基因系统的输出。与晶体结构Takahashi开始他的演讲的最后一部分的Bmal和时钟，时钟基因的转录激活因子的两个中心。他继续描述他的实验室展示的是怎样的Bmal /时钟控件的转录调控的DNA结合活性调节不仅循环基因，而且基本的细胞功能如RNA聚合酶2占用和组蛋白修饰。