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Skeletal Muscle Gender Dimorphism from Proteomics
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在家养狗和狼之间,面部肌肉生理学的进化分歧
Anne M Burrows1, Leo W Smith2, Sarah E Downing1
1Department of Physical Therapy, Duquesne University, Pittsburgh, Pennsylvania, USA.
Anatomical record (Hoboken, N.J. : 2007)
|October 3, 2024
概括
狗的化涉及面部肌肉的变化,狗具有快速抽的纤维,以快速表达,而狼具有持续的收缩能力. 这影响了我们对狗的进化理解.
科学领域:
- 进化生物学 进化生物学
- 比较生理学比较生理学
- 动物科学动物科学
背景情况:
- 养狗 (Canis familiaris) 是从灰狼 (Canis lupus) 进化而来的,养至少在15000年前开始.
- 狗和狼之间存在显著的形态差异,特别是在面部肌肉中,但它们的比较生理学尚不清楚.
- 了解这些生理差异可以增强我们对狗养机制的框架.
研究的目的:
- 为了比较家养狗和灰狼的面部肌肉的肌蛋白样本 (I型和II型).
- 为了研究狗和狼之间面部肌肉的生理功能差异.
主要方法:
- 来自斜肩肌 (zygomaticus) 和脊椎肌 (orbicularis oris) 肌肉中的肌蛋白样本的分析.
- 从6只家养狗和4只灰狼中获取了样本.
- 由于样本规模较小,没有进行统计分析.
主要成果:
- 养犬在采样的面部肌肉中显示出近100%的快 (II型) 肌纤维.
- 灰狼的肌肉纤维缩速度不到50% (II型),这表明肌肉纤维缩速度较慢的比例更高.
- 这表明狗具有能够快速收缩的面部肌肉,而狼则具有适合持续收缩的肌肉.
结论:
- 养狗与面部肌肉的生理变化有关,而不仅仅是形态变化.
- 肌肉纤维类型的分歧可能与进化压力有关,以加强与人类的面部沟通.
- 成年狗中保留的足形特征,如吠叫,也可能是导致的因素.
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