Where the Ends Meet: An Overview of Sex Determination in Atheriniform Fishes
Where the Ends Meet: An Overview of Sex Determination in Atheriniform Fishes
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DOI：
10.1159/000515191
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发表时间：
2021-05
影响因子：
2.3
通讯作者：
C. A. Strüssmann;Yoji Yamamoto;R. S. Hattori;J. I. Fernandino;G. Somoza
中科院分区：
文献类型：
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作者：
C. A. Strüssmann;Yoji Yamamoto;R. S. Hattori;J. I. Fernandino;G. Somoza
最近，斑状鱼类已成为性别决定的进化、生态和分子/生理学研究的有吸引力的模型。该组中的许多物种具有明显的温度依赖性性别决定（TSD），但许多物种还具有性别决定基因，为雄性分化提供强大的驱动力。因此，在这些物种中，环境（ESD）和基因型（GSD）性别决定这两种曾经被认为是相互排斥的性别决定形式可以在环境相关条件下共存。在这里，我们回顾了目前关于动脉粥样硬化鱼类性别决定的知识，重点是 ESD 和 GSD 的分子和生理机制、这两种机制之间的共存和交叉、环境信息的性腺外转导和/或性腺外性别决定起始的可能性，以及应用新工具（如耳石增量分析和为选定的新世界和旧世界动脉粥样硬化物种开发的遗传性别分子标记）的现场研究结果。我们还讨论了分子和组织学机制的存在，以防止由于环境和遗传信号模糊或冲突而导致性腺部分差异分化，特别是雌性是这些物种的默认状态的可能性。
Atheriniform fishes have recently emerged as attractive models for evolutionary, ecological, and molecular/physiological studies on sex determination. Many species in this group have marked temperature-dependent sex determination (TSD) and yet many species also have a sex determinant gene that provides a strong drive for male differentiation. Thus, in these species the 2 forms of sex determination that were once considered to be mutually exclusive, environmental (ESD) and genotypic (GSD) sex determination, can coexist at environmentally relevant conditions. Here, we review the current knowledge on sex determination in atheriniform fishes with emphasis on the molecular and physiological mechanisms of ESD and GSD, the coexistence and cross-talk between these 2 mechanisms, the possibility of extragonadal transduction of environmental information and/or extragonadal onset of sex determination, and the results of field studies applying novel tools such as otolith increment analysis and molecular markers of genetic sex developed for selected New World and Old World atheriniform species. We also discuss the existence of molecular and histological mechanisms to prevent the discrepant differentiation in parts of the gonads because of ambiguous or conflicting environmental and genetic signals and particularly the possibility that the female is the default state in these species.