精子的生产减少了线虫的寿命
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721.
Nature
|December 3, 1992
概括
在C. elegans中,性繁殖显著缩短了男性的寿命,但并没有缩短雌雄的寿命. 减少精子生产增加了寿命,这表明精子生成是减少寿命的关键因素.
科学领域:
- 进化生物学是进化的生物学.
- 老年学是一门学科.
- 生殖生物学 生殖生物学
背景情况:
- 性和死亡是生命的基本过程.
- 生殖往往会产生成本,从体质维护中转移资源,可能减少寿命.
- "生殖成本"是争论的,特别是关于测量和特定的生殖活动.
研究的目的:
- 研究性繁殖对Caenorhabditis elegans的寿命的影响.
- 为了确定精子生产或交配活动是否负责交配的男性的寿命缩短.
- 挑战关于 oogenesis 与精子生成的相对成本的传统假设.
主要方法:
- 对交配和不交配的Caenorhabditis elegans (雄性和雌性动物) 的比较寿命分析.
- 评估一种突变菌株的寿命,其精子产量减少.
- 寿命变化与精子生产水平的相关性.
主要成果:
- 性繁殖显著减少了C. elegans的男性寿命.
- 雌雄性动物的寿命并没有因交配而缩短.
- 一种减少精子生产的突变使两性平均寿命增加了约65%.
- 交配的男性的寿命缩短是由于精子的生产,而不是交配活动.
结论:
- 精子发生,而不是生殖或交配行为,是减少C. elegans的寿命的主要因素.
- 这一发现与已建立的生物学概念相矛盾,即卵细胞的生产比精子更昂贵.
- 对精子生产的生殖投资对生物体的寿命有很大影响.
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