The origination events of gametic sexual reproduction and anisogamy
The origination events of gametic sexual reproduction and anisogamy
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配子有性生殖和异配性的起源事件
DOI：
10.1007/s10164-022-00760-3
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发表时间：
2022
影响因子：
0.9
通讯作者：
Hasegawa Eisuke
中科院分区：
文献类型：
--
作者：
Yasui Yukio;Hasegawa Eisuke
配子性别（减数分裂和受精）的进化以及随后从同配（两个大小相等的配子之间的融合）到异配（卵子和精子的二态性，即雌性和雄性）的转变是进化生物学的最大谜团之一。减数分裂需要基因组稀释成本，异配性需要雄性生产成本。尽管性的维持机制已经取得了很大进展，但这种“性的双重成本”下的起源事件仍然没有解决。在这里，我们假设了如下两种假设情景：“跷跷板效应”假设等配子之间的自交自交有效地清除了生物体谱系中的有害突变，并同时修复了性别控制等位基因和所有其他基因座（没有增加基因组稀释成本）。同源细胞集落之间的高度相关性导致多细胞化。 “膨胀的同配子”假设是多细胞性增加了配偶双方的生殖投入，导致同配子过大。这种冗余导致了一种性别的欺骗（进化为雄性）以减少配子大小。然而，异性（进化为女性）允许这种作弊，因为她的成本没有改变。因此，异配现象最初是一种共栖现象，但由于解决了同配现象固有的配子限制问题而变得对雌性有利。这样，就实现了向异性婚的平稳过渡。
The evolution of gametic sex (meiosis and fertilization) and subsequent transition from isogamy (fusion between two equal-sized gametes) to anisogamy (dimorphism into eggs and sperm, namely, females and males) is one of the largest enigmas of evolutionary biology. Meiosis entails genome-dilution cost and anisogamy entails male-production cost. Despite much progress has been made for the maintenance mechanisms of sex, its origination events under such “twofold cost of sex” are still unsolved. Here, we posit two hypothetical scenarios as follows: the “Seesaw Effect” hypothesizes that automictic selfing between isogametes effectively purged deleterious mutations from an organism’s lineage and simultaneously fixed the sex-controlling allele and all other loci (no genome-dilution cost raised). The high relatedness among homoeologous cell colonies led to multicellularization. The “inflated isogamy” hypothesizes that multicellularity increased the reproductive investment of both mates, resulting in excessively large isogametes. This redundancy induced cheating of one sex (evolving to male) to reduce gamete size. However, the other sex (evolving to female) allowed this cheat because her cost did not change. Therefore, anisogamy originated as a kind of commensalism but turned into beneficial for females because it solved the gamete limitation problem inherent to isogamy. Thus, smooth transition to anisogamy had been attained.
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影响因子：
3.3
作者：
Koskella, Britt;Lively, Curtis M.
通讯作者：
Lively, Curtis M.
影响因子：
2
作者：
Geoff A. Parker;R. Baker;V.G.F. Smith
通讯作者：
V.G.F. Smith
影响果蝇遗传负荷的因素：协同上位性和适应性成分之间的相关性
DOI：
--
发表时间：
2000
期刊：
Evolution; international journal of organic evolution
影响因子：
--
作者：
M. Whitlock;D. Bourguet
通讯作者：
D. Bourguet
影响因子：
2.3
作者：
Lehtonen, Jussi;Kokko, Hanna
通讯作者：
Kokko, Hanna
异配进化过程中配子非随机融合的选择。
影响因子：
2
作者：
G. Parker
通讯作者：
G. Parker