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在无性生成的Daphnia pulex雄性中没有抑制重组

Cécile Molinier^1,2, Thomas Lenormand¹, Christoph R Haag¹

¹CEFE, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France.

Evolution; international journal of organic evolution

|June 22, 2023

概括

强制性生 (OP) 在Daphnia pulex中可能不仅仅是由于半变异中断而产生的. 重组抑制似乎受性别限制,这表明了超越"变质症工具包"的替代进化途径.

科学领域:

进化生物学是进化的生物学.
遗传学是一个遗传学.
生殖生物学生殖生物学

背景情况:

强制性生 (OP) 是一种繁殖模式,女性在没有男性的情况下产生后代.
人们常常假设它是通过中位变异的破坏和重组的抑制而演变的.
循环生 (CP) 涉及性和无性繁殖.

研究的目的:

为了研究基因机制背后的进化从周期性生 (CP) 强制性生 (OP) 在Daphnia pulex.
为了确定是否有机分裂中断和重组抑制是过渡到OP的关键因素.
探索异性发展的其他进化途径.

主要方法:

在Daphnia pulex.中构建高密度遗传链接地图.
强制性亲遗传 (OP) 雄性,周期性亲遗传 (CP) 雄性和CP雌性之间的重组率的比较.
对性别受限基因表达的分析及其在重组抑制中的潜在作用.

主要成果:

与CP个体相比,OP雄性仅略微而非显著地降低了复合率.
介质分裂中断和重组抑制似乎是受性别限制或部分受性别限制的.
以前涉及OP的候选基因在两性中都得到表达.

结论:

达芬尼亚的OP的演变可能不仅仅取决于干扰变或抑制两性重组.
其他机制,如重组抑制剂的限女性作用或在 oogenesis 中扩展现有的 parthenogenesis 途径,是可信的.
从CP向OP的过渡可能涉及 oogenesis调节基因的突变,而不仅仅是那些在"变质症工具包".

关键词:

达夫尼亚 (Daphnia) 是一种多夫尼亚.无性恋是一种无性行为.异性异化症是什么意思链接地图链接地图强制性的伴生代.

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