数字农科院2.0

The enormous repetitive Antarctic krill genome reveals environmental adaptations and population insights

文献类型： 外文期刊

作者： Changwei Shao;Shuai Sun;Kaiqiang Liu;Jiahao Wang;Shuo Li;Qun Liu;Bruce E. Deagle;Inge Seim;Alberto Biscontin;Qian Wang;Xin Liu;So Kawaguchi;Yalin Liu;Simon Jarman;Yue Wang;Hong Yan Wang;Guodong Huang;Jiang Hu;Bo Feng;Cristiano De Pittà;Shanshan Liu;Rui Wang;Kailong Ma;Yiping Ying;Gabrielle Sales;Tao Sun;Xinliang Wang;Yaolei Zhang;Yunxia Zhao;Shanshan Pan;Xiancai Hao;Yang Wang;Jiakun Xu;Bowen Yue;Yanxu Sun;He Zhang;Mengyang Xu;Yuyan Liu;Xiaodong Jia;Jiancheng Zhu;Shufang Liu;Jue Ruan;Guojie Zhang;Huanming Yang;Xun Xu;Jun Wang;Xianyong Zhao;Bettina Meyer;Guangyi Fan

作者机构：

关键词： Antarctic krill (Euphausia superba);chromosome-level genome;circadian clock;environmental adaptation;giant genome size;population demography;population differentiation;repeat expansions

期刊名称： Cell

ISSN： 0092-8674

年卷期： 2023 年 186 卷 6 期

页码：

收录情况： SCIE（2023版）

摘要： Antarctic krill (Euphausia superba) is Earth's most abundant wild animal, and its enormous biomass is vital to the Southern Ocean ecosystem. Here, we report a 48.01-Gb chromosome-level Antarctic krill genome, whose large genome size appears to have resulted from inter-genic transposable element expansions. Our assembly reveals the molecular architecture of the Antarctic krill circadian clock and uncovers expanded gene families associated with molting and energy metabolism, providing insights into adaptations to the cold and highly seasonal Antarctic environment. Population-level genome re-sequencing from four geographical sites around the Antarctic continent reveals no clear population structure but highlights natural selection associated with environmental variables. An apparent drastic reduction in krill population size 10 mya and a subsequent rebound 100 thousand years ago coincides with climate change events. Our findings uncover the genomic basis of Antarctic krill adaptations to the Southern Ocean and provide valuable resources for future Antarctic research.

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