鸟类中的气味受体的进化多样性和功能
bioRxiv : the preprint server for biology
|November 26, 2025
概括
鸟类拥有大量的嗅觉受体 (OR),挑战了关于它们有限的嗅觉的先前假设. 基因转换显著塑造了这些鸟类的ORs,揭示了与哺乳动物的进化并行.
科学领域:
- 嗅觉受体 (OR) 基因家族
- 进行比较的基因组学.
- 进化生物学是进化的生物学.
背景情况:
- 脊椎动物嗅觉受体 (ORs) 是一个庞大的基因家族,哺乳动物通常拥有数百个完整的OR基因.
- 历史上,鸟类的嗅觉被认为是不那么重要的,因为它们的行为多样化,尽管它们有复杂的感官处理的潜力.
研究的目的:
- 研究鸟类基因组中的气味受体 (ORs) 的多样性和进化特征.
- 为了确定鸟类ORs对气味剂的表达和功能反应.
- 探索鸟类和哺乳动物ORs之间的进化关系.
主要方法:
- 鸟类OR基因谱的全基因组分析.
- 在鸟类OR亚家族内进行基因转换分析,特别是玛-c类.
- 鸟类ORs在嗅觉感官神经元中的表达分析.
- 鸟类ORs的连接物识别和功能特征.
主要成果:
- 鸟类基因组编码了数百到数千个完整的ORs,与哺乳动物相似.
- 广泛的基因转换已经塑造了大多数鸟类的OR,特别是在玛-c亚家族中.
- 鸟类的ORs在嗅觉感官神经元中表达,并对特定的气味剂做出反应.
- 对于鸟类ORs,已确定了连接体,显示出独特的类功能和与哺乳动物ORs的保护.
结论:
- 鸟类的嗅觉系统与哺乳动物系统有意想不到的组织相似之处.
- 广泛的基因转换是鸟类ORs的一个独特的进化特征.
- 这项研究揭示了对鸟类嗅觉系统的演变和功能的新见解.
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