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在受精后实现的线粒体单亲遗传挑战了核细胞质冲突假说的异性恋进化
Tatsuya Togashi1, Geoff A Parker2, Yusuke Horinouchi1,3
1Marine Biosystems Research Center, Chiba University, Kamogawa 299-5502, Japan.
Biology letters
|September 27, 2023
概括
不同大小的雌性体的进化 (非雌性体) 可能不会通过最小化雄性雌性体大小来防止核细胞质冲突来驱动. 相反,通过在绿藻中受精后消除父性线粒体来强制执行单亲遗传.
科学领域:
- 进化生物学 进化生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 偶质体大小变异 (异性异性) 进化为真核生物中的异性异性异性.
- 核-细胞质冲突假说表明,异性恋通过确保单亲细胞器官遗传来防止冲突,最大限度地减少男性性器官尺寸.
- 绿藻 (Ulvophycean green algae) 在同性物种中经常表现出双亲细胞器官遗传.
研究的目的:
- 为了测试核-细胞质冲突假设的异性恋进化.
- 为了研究轻微异性异性类动物的细胞质遗传, *Monostroma angicava*.
- 为了确定男性性伴生体尺寸最小化是否是单亲性器官细胞遗传的机制.
主要方法:
- 这是一种Monostroma angicava*的跨物种交叉.
- 使用PCR-RFLP标记物跟踪线粒体命运.
- 分析胞胎发育和线粒体DNA的存在.
主要成果:
- 在 *Monostroma angicava* 中的线粒体是从母亲遗传的.
- 父亲的线粒体进入胚胎,其DNA持续超过14天.
- 单亲遗传是通过在受精后消除父性线粒体DNA来实现的,而不是通过减少雄性伴侣体大小.
结论:
- 乌尔沃类动物中单亲细胞质遗传的机制是对父性线粒体的囊胞性消除.
- 这种机制与核-细胞质冲突假说提出的男性性伴侣体尺寸最小化不同.
- 核-细胞质冲突假说不太可能是类动物中异性恋进化的主要驱动因素.
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