在GnRH神经元中长期存在的冗余gnrh1/3表达使得在进化过程中可见的交换了对应物使用
Chika Fujimori1,2, Kohei Sugimoto1,3, Mio Ishida3
1Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan.
iScience
|March 11, 2024
概括
跨物种同类细胞的基因表达差异令人费解. 这项研究表明,在祖先物种中,淋巴激素释放激素 (GnRH) 相对物体的冗余表达可能解释了现代脊椎动物中GnRH亚型的切换.
科学领域:
- 进化生物学是进化的生物学.
- 神经内分泌学神经内分泌学
- 遗传学 是一个遗传学.
背景情况:
- 功能上相似的细胞中的基因表达在物种之间可能有所不同.
- 这些差异的进化原因,特别是在相似的基因表达中,仍然不清楚.
- 脊椎动物中低生理性性腺激素释放激素 (GnRH) 神经元提供了一个研究这些机制的模型.
研究的目的:
- 为了研究基因突变性GnRH神经元平行表达的物种特异性差异背后的进化机制.
- 探索脊椎动物GnRH基因表达的潜在祖先状态.
主要方法:
- 在不同脊椎动物物种中对GnRH神经元基因表达的比较分析.
- 使用记者基因测试来测试海豚GNRH增强剂在斑马鱼和海豚鱼中的调节功能.
主要成果:
- 在海豚中的单个低生理性GnRH神经元中识别了gnrh1和gnrh3的冗余表达,这表明了一个祖先系统.
- 证明海豚gnrh1/gnrh3增强剂可以驱动斑马鱼和梅达卡单个GnRH神经元中的记者基因表达.
- 观察到特定物种的表达模式,其中斑马鱼主要表达gnrh3,而梅达卡表达gnrh1.
结论:
- 在祖先物种中gnrh1和gnrh3的冗余表达可能是驱动现存脊椎动物物种中明显切换paralog使用的关键机制.
- 这种祖先的冗余性可能促进了今天观察到的独特的GnRH平行表达模式的演变.
- 这些发现提供了对基因调节和paralog多样化的进化动态的见解.
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