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Updated: May 11, 2026
07:01
Manipulation of Gene Function in Mexican Cavefish
Published on: April 22, 2019
刺信号控制盲人洞穴鱼的眼睛退化
Yoshiyuki Yamamoto1, David W Stock, William R Jeffery
1Department of Biology, University of Maryland, College Park, Maryland 20742, USA.
Nature
|October 16, 2004
概括
盲人洞穴鱼胚胎中的刺 (Hh) 基因表达通过导致透镜细胞死亡导致眼睛退化. 这一发现揭示了洞穴生活物种眼睛损失的关键进化机制.
科学领域:
- 发育生物学 发展生物学
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
背景情况:
- 刺 (Hh) 蛋白对于胚胎发育至关重要.
- Hh信号在适应,特别是眼睛损失方面的进化作用尚不清楚.
研究的目的:
- 调查Hh基因表达在盲洞穴鱼眼睛进化性退化中的作用.
- 为了确定Astyanax mexicanus物种复合体中眼睛损失的基因机制.
主要方法:
- 对双眼表面鱼和盲洞穴鱼基因表达的比较分析.
- 胚胎眼睛发育的观察和透镜亡的评估.
- 在表面鱼类模型中进行基因过度表达实验.
主要成果:
- 盲洞鱼在胚胎中线上表现出扩大的声波刺 (shh) 和眼刺 (twhh) 基因表达.
- 这种扩展的Hh信号导致透镜亡,并阻止洞穴鱼的眼睛发育.
- 表面鱼类中twhh和/或shh的过度表达模仿了洞穴鱼中观察到的眼睛退化现型.
结论:
- 异常的Hh信号是洞穴鱼进化过程中眼睛退化的主要驱动因素.
- 这项研究为洞穴中生活的脊椎动物失去眼睛提供了遗传基础.
- Hh通路调制代表了对地下环境的显著进化适应.
相关概念视频
02:33Hedgehog Signaling Pathway
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...
02:33Hedgehog Signaling Pathway
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...