Epigenetic anticipation for food and reproduction.

IF 4.8 Q1 GENETICS & HEREDITY Environmental Epigenetics Pub Date : 2020-01-30 eCollection Date: 2020-01-01 DOI:10.1093/eep/dvz026
Christelle Leung, Bernard Angers, Patrick Bergeron
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Abstract

Physiological changes in anticipation of cyclic environmental events are common for the persistence of populations in fluctuating environments (e.g. seasons). However, dealing with sporadic resources such as the intermittent production of seed masting trees may be challenging unless reliable cues also make them predictable. To be adaptive, the anticipation of such episodic events would have to trigger the corresponding physiological response. Epigenetic modifications could result in such physiological anticipatory responses to future changes. The eastern chipmunk (Tamias striatus) is known to adjust its reproductive activity to match juvenile weaning with peak seed availability of masting trees, which are essential for their survival. We therefore expected that epigenetic changes would be linked to spring reproductive initiation in anticipation for beech seed availability in fall. We correlated the variation of DNA methylation profiles of 114 adult chipmunks captured in May with beech seeds abundance in September, over 4 years, for three distinct populations, as well as individuals sampled twice during reproductive and non-reproductive years. The significant correlation between spring epigenetic variation and the amount of food in the fall confirmed the phenotypic flexibility of individuals according to environmental fluctuations. Altogether, these results underlined the key role of epigenetic processes in anticipatory responses enabling organisms to persist in fluctuating environments.

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表观遗传学对食物和繁殖的预期。
预测周期性环境事件的生理变化是种群在波动环境(如季节)中持续生存的常见现象。然而,处理零星的资源(如间歇性生产的播种树)可能具有挑战性,除非可靠的线索也能使它们变得可预测。为了适应环境,对这种偶发事件的预期必须触发相应的生理反应。表观遗传修饰可能会导致对未来变化的这种生理预期反应。众所周知,东部花栗鼠(Tamias striatus)会调整其繁殖活动,以配合幼鼠断奶期和它们赖以生存的树木种子供应高峰期。因此,我们预计表观遗传学的变化将与春季生殖活动的启动有关,以期待秋季山毛榉种子的供应。我们将 4 年中在 5 月份捕获的 114 只成年花栗鼠的 DNA 甲基化图谱变化与 9 月份山毛榉种子的丰度进行了相关性分析,结果显示了三个不同的种群,以及在繁殖期和非繁殖期采样两次的个体。春季表观遗传变异与秋季食物量之间的显着相关性证实了个体表型随环境波动而变化的灵活性。总之,这些结果凸显了表观遗传过程在预测反应中的关键作用,使生物能够在波动的环境中持续生存。
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来源期刊
Environmental Epigenetics
Environmental Epigenetics GENETICS & HEREDITY-
CiteScore
6.50
自引率
5.30%
发文量
0
审稿时长
17 weeks
期刊最新文献
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