Endogenous rhythm variation and adaptation to the tidal environment in the freshwater snail, Semisulcospira reiniana
Endogenous rhythm variation and adaptation to the tidal environment in the freshwater snail, Semisulcospira reiniana
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淡水螺（Semisulcospira reiniana）的内源节律变化及其对潮汐环境的适应
DOI：
10.3389/fevo.2022.1078234
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
T. Yokomizo;Yuma Takahashi
中科院分区：
文献类型：
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作者：
T. Yokomizo;Yuma Takahashi
生物体具有内源性计时系统，以协调其生物过程与环境周期，从而适应其环境中的外部节奏变化。内源性节律的变化可能有助于在新的节律环境中扩大音域。我们假设，河口附近的淡水蜗牛种群显示出与潮汐周期同步的昼夜节律。我们比较了淡水螺（Semisulcospira reiniana）非潮汐和潮汐种群之间的行为和基因表达节律。居住在潮汐区的个人表现出与潮汐周期协调的节律性活动模式，在现场和实验室条件下，但居住在上游非潮汐区的个人表现出昼夜活动模式。非潮汐性个体的昼夜节律振荡基因比例高于潮汐性个体，而潮汐性个体的昼夜节律振荡基因比例高于非潮汐性个体。此外，全转录组群体遗传分析显示，这两个相邻的群体可以清楚地区分遗传，虽然遗传距离很小。我们的研究结果提供了证据，通过范围扩大到一个新的节奏环境的内源性节奏的转变。少数基因和/或表型可塑性的变化可能有助于非潮汐和潮汐种群之间的内源节律的差异。
Organisms have endogenous timekeeping system(s) to coordinate their biological processes with environmental cycles, allowing adaptation to external rhythmic changes in their environment. The change in endogenous rhythms could contribute to range expansion in a novel rhythmic environment. We hypothesized that populations of the freshwater snail near estuaries show a circatidal rhythm to synchronize with the tidal cycle. We compared the behavioral and gene expression rhythms between non-tidal and tidal populations of the freshwater snail, Semisulcospira reiniana. Individuals inhabiting tidal areas exhibited a rhythmic activity pattern coordinated with the tidal cycle under both field and laboratory conditions, but individuals inhabiting upstream non-tidal areas showed a circadian activity pattern. The proportion of circadian oscillating genes was greater in non-tidal than in tidal individuals, while that of circatidal oscillating genes was greater in tidal than in non-tidal individuals. Additionally, transcriptome-wide population genetic analyses revealed that these two adjacent populations can be clearly distinguished genetically, though the genetic distance was very small. Our results provide evidence of the shift in an endogenous rhythm via range expansion to a novel rhythmic environment. The changes in a small number of genes and/or phenotypic plasticity may contribute to the difference in the endogenous rhythms between non-tidal and tidal populations.