ArticleMolecular biology and evolution2023
Genomics of Secondarily Temperate Adaptation in the Only Non-Antarctic Icefish.
Article in Molecular biology and evolution, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed, 21 citations in OpenAlex.
- Convergent latitudinal erosion of circadian systems in a rapidly diversifying order of fishes.PLoS genetics · 2026Article
- Chromosome-scale genome assembly and annotation of Jonah's icefish Neopagetopsis ionah.Scientific data · 2026Article
- A new phased assembly of the Antarctic spiny plunderfish provides novel insights into the evolution of the notothenioid radiation.bioRxiv : the preprint server for biology · 2026Article
- Temperature and Pressure Shaped the Evolution of Antifreeze Proteins in Polar and Deep Sea Zoarcoid Fishes.Molecular biology and evolution · 2025Article
- Hemoglobin-Gene Cluster Deletions in Antarctic White-Blooded Icefishes Facilitated by Transposable Elements.Genome biology and evolution · 2025Article
- Dynamic Outlier Slicing Allows Broader Exploration of Adaptive Divergence: A Comparison of Individual Genome and Pool-Seq Data Linked to Humic Adaptation in Perch.Molecular ecology · 2025Article
- The genome of the cryopelagic Antarctic bald notothen, Trematomus borchgrevinki.G3 (Bethesda, Md.) · 2025Article
- Klumpy: A tool to evaluate the integrity of long-read genome assemblies and illusive sequence motifs.Molecular ecology resources · 2025Article
- Gene loss in Antarctic icefish: evolutionary adaptations mimicking Fanconi Anemia?BMC genomics · 2024Article
- Identification of two miRNAs regulating cardiomyocyte proliferation in an Antarctic icefish.iScience · 2024Article
- Chromosome-level genome assembly and annotation of the Antarctica whitefin plunderfish Pogonophryne albipinna.Scientific data · 2023Article
- Article
- Novel mitochondrial genome rearrangements including duplications and extensive heteroplasmy could underlie temperature adaptations in Antarctic notothenioid fishes.Scientific reports · 2023Article
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Authors and funding
10 authors at 4 institutions in 3 countries.
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Abstract
White-blooded Antarctic icefishes, a family within the adaptive radiation of Antarctic notothenioid fishes, are an example of extreme biological specialization to both the chronic cold of the Southern Ocean and life without hemoglobin. As a result, icefishes display derived physiology that limits them to the cold and highly oxygenated Antarctic waters. Against these constraints, remarkably one species, the pike icefish Champsocephalus esox, successfully colonized temperate South American waters. To study the genetic mechanisms underlying secondarily temperate adaptation in icefishes, we generated chromosome-level genome assemblies of both C. esox and its Antarctic sister species, Champsocephalus gunnari. The C. esox genome is similar in structure and organization to that of its Antarctic congener; however, we observe evidence of chromosomal rearrangements coinciding with regions of elevated genetic divergence in pike icefish populations. We also find several key biological pathways under selection, including genes related to mitochondria and vision, highlighting candidates behind temperate adaptation in C. esox. Substantial antifreeze glycoprotein (AFGP) pseudogenization has occurred in the pike icefish, likely due to relaxed selection following ancestral escape from Antarctica. The canonical AFGP locus organization is conserved in C. esox and C. gunnari, but both show a translocation of two AFGP copies to a separate locus, previously unobserved in cryonotothenioids. Altogether, the study of this secondarily temperate species provides an insight into the mechanisms underlying adaptation to ecologically disparate environments in this otherwise highly specialized group.
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