在新世界中,苦味受体基因的功能性衰退
Ling Xiang1,2, Yanhong Chen2,3, Haohao Jing2
1Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau, Ministry of Education, School of Ecology and Environment, Tibet University, Lhasa 850000, China.
Molecular biology and evolution
|March 29, 2025
概括
新世界由于Tas2r2基因的变化导致苦味感知能力下降,与旧世界不同. 这可能会影响它们检测尸中的有害毒素的能力.
科学领域:
- 进化生物学是进化的生物学.
- 感官生态学 感官生态学
- 基因组学就是基因组学.
背景情况:
- 通过Tas2r受体介导的苦味感知对于避免有毒物质至关重要.
- ,必须的食尸动物,消费尸可能含有苦的微生物代谢物,但他们的苦味感觉是不太了解.
- 鉴于的保护状况,了解的化学感觉至关重要.
研究的目的:
- 研究的苦味感知基因基础和功能能力.
- 为了比较旧世界和新世界之间的苦味受体 (Tas2r) 基因进化.
- 评估改变苦味感知对的生存的影响.
主要方法:
- 在6种类和22种其他类动物中对Tas2r基因进行全基因组识别.
- 对Tas2r基因进化的生物信息分析,重点关注功能约束和分歧.
- 分子对接模拟以预测Tas2r2变体的连接物结合亲和力.
- 基于细胞的功能测定测量Tas2r2对天然苦味化合物的反应.
主要成果:
- 在大多数研究物种中发现完整的Tas2r1和Tas2r2基因,除了鱼.
- 新世界在Tas2r2中表现出功能约束的放松,对苦味化合物的预测结合亲和力降低.
- 功能测试证实,与其他鸟类相比,新世界Tas2r2的反应能力较低.
- 旧世界没有表现出这种功能性衰退的苦味感知.
结论:
- 新世界具有功能性下降的苦味感知,与Tas2r2基因进化有关.
- 这种感觉障碍可能会降低它们避免苦毒素的能力,包括杀虫剂和兽药.
- 新世界的保护策略应该考虑环境化学风险.
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