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• W2912682376 abstract "Evolution of Antarctic notothenioid fishes in the isolated freezing Southern Ocean have led to remarkable trait gains and losses. One of the most extraordinary was the loss of the major oxygen carrier hemoglobin (Hb) in the icefishes (family Channichthyidae). While the mechanisms of this loss and the resulting compensatory changes have been well studied, the impact of Hb loss on the network of genes that once supported its recycling and disposal has remained unexplored. Here we report the functional fate and underlying molecular changes of two such key Hb-supporting proteins across the icefish family - haptoglobin (Hp) and hemopexin (Hx), crucial in removing cytotoxic free Hb and heme respectively. Hp plays a critical role in binding free Hb for intracellular recycling and absent its primary client, icefish Hp transcription is now vanishingly little and translation into a functional protein is nearly silenced. Hp genotype degeneration has manifested in separate lineages of the icefish phylogeny with three distinct nonsense mutations and a deletion-frameshift, as well as mutated polyadenylation signal sequences. Thus, Hb loss appears to have diminished selective constraint on Hp maintenance, resulting in its stochastic, co-evolutionary drift towards extinction. Hx binds free heme for iron recycling in hepatocytes. In contrast to Hp, Hx genotype integrity is preserved in the icefishes and transcription occurs at comparable levels to the red-blooded notothenioids. The persistence of Hx likely owes to continued selective pressure for its function from mitochondrial and non-Hb cellular hemoproteins." @default.
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• W2912682376 date "2019-01-01" @default.
• W2912682376 modified "2023-09-24" @default.
• W2912682376 title "A tale of two genes: divergent evolutionary fate of haptoglobin and hemopexin in hemoglobinless antarctic icefishes" @default.
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• W2912682376 doi "https://doi.org/10.1242/jeb.188573" @default.
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