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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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在小鼠胚胎中,Sall基因调节后肢启动.

Katherine Q Chen1, Hiroko Kawakami1,2,3, Aaron Anderson1

  • 1Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA.

Genetics
|February 22, 2024
PubMed
概括

已确定Sall1和Sall4是对小鼠胚胎后肢芽启动至关重要的主调节体. 这些基因一起工作,显示功能冗余,以确保后肢的适当发育.

关键词:
岛屿是一个岛屿.这里是Sall1的这里是Sall4all.后肢 后肢 后肢肢体启动的开始

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科学领域:

  • 发育生物学是发展生物学.
  • 遗传学 是一个遗传学.
  • 分子生物学分子生物学

背景情况:

  • 脊椎动物的四肢发育涉及前肢和后肢的独特分子机制.
  • 后肢发育是由特定的转录系统启动的,包括Isl1基因.
  • 控制后肢启动的精确遗传调节器需要进一步阐明.

研究的目的:

  • 研究Sall1和Sall4基因在小鼠胚胎中启动后肢发育中的作用.
  • 确定后肢发育中的Sall4和Isl1之间的遗传相互作用.
  • 探索Sall1和Sall4之间在调节后肢原始细胞标记物中的功能冗余.

主要方法:

  • 使用条件淘汰赛小鼠模型 (TCre; Isl1 和 Hoxb6Cre; Isl1) 来评估后肢芽的形成.
  • 生成的TCre介导的Sall1和Sall4.4的有条件双重淘汰.
  • 在突变胚胎中分析了关键的后肢原始标记物 (Isl1,Pitx1,Tbx4) 的表达.

主要成果:

  • TCre; Isl1条件淘汰赛导致后肢芽的频率损失达到100%.
  • Hoxb6Cre; Isl1条件淘汰赛表现出一个低形态表型,后肢损失5%.
  • 观察到Sall4和Isl1之间的遗传相互作用,Sall4在Isl1.1的上游作用.
  • 通过TCre介导的Sall1和Sall4双重淘汰导致后肢发育完全失败和祖先标记物的丧失,表明功能冗余.

结论:

  • 在小鼠胚胎中,Sall1和Sall4作为主调节剂,对后肢启动至关重要.
  • 在调节后肢发育方面,Sall1和Sall4之间存在功能冗余.
  • 这些发现为管理后肢启动的分子机制提供了关键的遗传见解.