Population genomics of an icefish reveals mechanisms of glacier-driven adaptive radiation in Antarctic notothenioids ...

• Main Authors: Lu, Ying, Li, Wenhao, Li, Yalin, Zhai, Wanying, Zhou, Xuming, Wu, Zhichao, Jiang, Shouwen, Liu, Taigang, Wang, Huamin, Hu, Ruiqin, Zhou, Yan, Zou, Jun, Hu, Peng, Guan, Guijun, Xu, Qianghua, Canário, Adelino V. M., Chen, Liangbiao
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: figshare 2022
• Subjects: Genetics; FOS Biological sciences; Antarc*; Antarctic; Antarctica; Icefish
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.6245015; https://springernature.figshare.com/collections/Population_genomics_of_an_icefish_reveals_mechanisms_of_glacier-driven_adaptive_radiation_in_Antarctic_notothenioids/6245015

Abstract Background Antarctica harbors the bulk of the species diversity of the dominant teleost fish suborder—Notothenioidei. However, the forces that shape their evolution are still under debate. Results We sequenced the genome of an icefish, Chionodraco hamatus, and used population genomics and demographic modelling of sequenced genomes of 52 C. hamatus individuals collected mainly from two East Antarctic regions to investigate the factors driving speciation. Results revealed four icefish populations with clear reproduction separation were established 15 to 50 kya (kilo years ago) during the last glacial maxima (LGM). Selection sweeps in genes involving immune responses, cardiovascular development, and photoperception occurred differentially among the populations and were correlated with population-specific microbial communities and acquisition of distinct morphological features in the icefish taxa. Population and species-specific antifreeze glycoprotein gene expansion and glacial cycle-paced ...