Antarctic blackfin icefish genome reveals adaptations to extreme environments.

Nature Ecology & Evolution
Bo-Mi KimHyun Park

Abstract

Icefishes (suborder Notothenioidei; family Channichthyidae) are the only vertebrates that lack functional haemoglobin genes and red blood cells. Here, we report a high-quality genome assembly and linkage map for the Antarctic blackfin icefish Chaenocephalus aceratus, highlighting evolved genomic features for its unique physiology. Phylogenomic analysis revealed that Antarctic fish of the teleost suborder Notothenioidei, including icefishes, diverged from the stickleback lineage about 77 million years ago and subsequently evolved cold-adapted phenotypes as the Southern Ocean cooled to sub-zero temperatures. Our results show that genes involved in protection from ice damage, including genes encoding antifreeze glycoprotein and zona pellucida proteins, are highly expanded in the icefish genome. Furthermore, genes that encode enzymes that help to control cellular redox state, including members of the sod3 and nqo1 gene families, are expanded, probably as evolutionary adaptations to the relatively high concentration of oxygen dissolved in cold Antarctic waters. In contrast, some crucial regulators of circadian homeostasis (cry and per genes) are absent from the icefish genome, suggesting compromised control of biological rhythms in ...Continue Reading

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Citations

Nov 7, 2019·BMC Evolutionary Biology·Samuel N Bogan, Sean P Place
Jul 25, 2019·Lab Animal·Jim Kling
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Datasets Mentioned

BETA
SRP118539
SRP069031

Methods Mentioned

BETA
PCR

Software Mentioned

fq2psmcfa
bcftools call
psmc
- Toolkit
BWA
Jellyfish
SE
RepeatScout
Synolog
TimeTree

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