Single-Gene Speciation, Balanced Polymorphism, and Antagonistic Coevolution in Left-Right Asymmetry of Land Snails
Single-Gene Speciation, Balanced Polymorphism, and Antagonistic Coevolution in Left-Right Asymmetry of Land Snails
复制标题
陆地蜗牛左右不对称的单基因物种形成、平衡多态性和拮抗协同进化
DOI：
10.1007/978-981-19-1342-6_10
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Yamamichi Masato
中科院分区：
文献类型：
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作者：
Hirama F;Urabe J;Doi H;Kazama T;Noguchi T;Tappenbeck TH;Katano I;Yamamichi M;Yoshida T and Elser JJ.;Yamamichi Masato
由于其独特的特征，包括离散的右旋对称性，陆生蜗牛的左右不对称性在进化生物学中发挥了重要作用。（右撇子）和左撇子（左手）表型，其中具有两个等位基因的单个基因座决定利手的简单遗传结构，其中母体基因型决定后代表型的延迟遗传，右旋和左旋表型之间的生殖不相容性，偏向于捕食更多的右旋个体。在这里，我介绍了从蜗牛左右不对称的角度对单基因物种形成，平衡多态性和拮抗协同进化的理论研究。研究人员利用种群遗传学、数量遗传学和种群生态学模型揭示了：（1）遗传漂变、延迟遗传、隐性突变等位基因和对一个常驻表型的偏向捕食促进了单基因物种形成;（2）延迟遗传可以通过时间储存效应促进环境随机性下遗传变异的维持，（3）当捕食者快速进化时，捕食者连续性状和被捕食者离散性状之间的协同进化可导致捕食者灭绝。基于这些结果，我讨论了未来的前景以及我们如何根据特定生物体的经验证据获得一般理论结果。
Left-right asymmetry of land snails has played an important role in evolutionary biology due to its unique characteristics including discrete dextral (right-handed) and sinistral (left-handed) phenotypes, a simple genetic architecture in which a single locus with two alleles determines handedness, delayed inheritance where maternal genotypes determine offspring phenotypes, reproductive incompatibility between dextral and sinistral phenotypes, and biased predation on more abundant dextral individuals. Here, I introduce theoretical studies on single-gene speciation, balanced polymorphism, and antagonistic coevolution from a perspective of snail left-right asymmetry. By using models of population genetics, quantitative genetics, and population ecology, researchers have revealed that (1) single-gene speciation is promoted by genetic drift, delayed inheritance, recessive mutant alleles, and biased predation on a resident phenotype, (2) delayed inheritance can promote the maintenance of genetic variation under environmental stochasticity via the temporal storage effect, and (3) coevolution between a predator continuous trait and a prey discrete trait can result in predator extinction when the predator evolves rapidly. Based on these results, I discuss future perspectives as well as how we can obtain general theoretical results based on empirical evidence in specific organisms.