Abstract
Adaptation to various altitudes and oxygen levels is a major aspect of vertebrate evolution. Hemoglobin is an erythrocyte protein belonging to the globin superfamily, and the α-, β-globin genes of jawed vertebrates encode tetrameric ((α2β2) hemoglobin, which contributes to aerobic metabolism by delivering oxygen from the respiratory exchange surfaces into cells. However, there are various gaps in knowledge regarding hemoglobin gene evolution, including patterns in cartilaginous fish and the roles of gene conversion in various taxa. Hence, we evaluated the evolutionary history of the vertebrate hemoglobin gene family by analyses of 97 species representing all classes of vertebrates. By genome-wide analyses, we extracted 879 hemoglobin sequences. Members of the hemoglobin gene family were conserved in birds and reptiles but variable in mammals, amphibians, and teleosts. Gene motifs, structures, and synteny were relatively well-conserved among vertebrates. Our results revealed that purifying selection contributed substantially to the evolution of all vertebrate hemoglobin genes, with mean dN/dS (ω) values ranging from 0.057 in teleosts to 0.359 in reptiles. In general, after the fish-specific genome duplication, the teleost hemoglobin genes showed variation in rates of evolution, and the β-globin genes showed relatively high ω values after a gene transposition event in amniotes. We also observed that the frequency of gene conversion was high in amniotes, with fewer hemoglobin genes and higher rates of evolution. Collectively, our findings provide detail insight into complex evolutionary processes shaping the vertebrate hemoglobin gene family, involving gene duplication, gene loss, purifying selection, and gene conversion.
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We thank members from Peng’s lab for constructive discussion. This work was funded by the grant from the National Natural Science Foundation of China (No. 31872204).
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This work was funded by the grant from the National Natural Science Foundation of China (No. 31872204).
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ZP contributed to the study conception and design. YM, TP, ZQ and FS contributed to material preparation, data collection and analysis. YM, and TP prepared the first draft of the manuscript and all authors commented on the manuscript. All authors read and approved the final manuscript.
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Mao, Y., Peng, T., Shao, F. et al. Molecular evolution of the hemoglobin gene family across vertebrates. Genetica 151, 201–213 (2023). https://doi.org/10.1007/s10709-023-00187-9
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DOI: https://doi.org/10.1007/s10709-023-00187-9