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Molecular characterization of positively selected genes contributing aquatic adaptation in marine mammals

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Abstract

Background

Marine mammals, which have evolved independently into three distinct lineages, share common physiological features that contribute to their adaptation to the marine environment.

Objective

To identify positively selected genes (PSGs) for adaptation to the marine environment using available genomic data from three taxonomic orders: cetaceans, pinnipeds, and sirenians.

Methods

Based on the genomes within each group of Artiodactyla, Carnivora and Afrotheria, we performed selection analysis using the branch-site model in CODEML.

Results

Based on the branch-site model, 460, 614, and 359 PSGs were predicted for the cetaceans, pinnipeds, and sirenians, respectively. Functional enrichment analysis indicated that genes associated with hemostasis were positively selected across all lineages of marine mammals. We observed positive selection signals for the hemostasis and coagulation-related genes plasminogen activator, urokinase (PLAU), multimerin 1 (MMRN1), gamma-glutamyl carboxylase (GGCX), and platelet endothelial aggregation receptor 1 (PEAR1). Additionally, we found out that the sodium voltage-gated channel alpha subunit 9 (SCN9A), serine/arginine repetitive matrix 4 (SRRM4), and Ki-ras-induced actin-interacting protein (KRAP) are under positive selection pressure and are associated with cognition, neurite outgrowth, and IP3-mediated Ca2 + release, respectively.

Conclusion

This study will contribute to our understanding of the adaptive evolution of marine mammals by providing information on a group of candidate genes that are predicted to influence adaptation to aquatic environments, as well as their functional characteristics.

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Data availability

The authors confirm that the data supporting the findings of this study are available within the article or its supplementary materials. The data that support the findings of this study are available from the corresponding author, Lee or Park, upon reasonable request.

Abbreviations

PSGs:

Positively selected genes

aPTT:

Activated partial thromboplastin time

MSA:

Multiple sequence alignment

CDSs:

Coding sequences

CSB:

Clean Segment Block

EPC:

Edge Percolated Component

MNC:

Maximum Neighborhood Component

DMNC:

Density of Maximum Neighborhood Component

MCC:

Maximal Clique Centrality

BN:

Bottleneck

GO:

Gene ontology

CREB:

CAMP response element-binding proteins

CBP:

CREB-binding protein

References

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Acknowledgements

This research was part of the “Development of biomedical materials based on marine proteins” project (20170305) funded by the Ministry of Oceans and Fisheries, Korea, and an in-house program (EA0122) from the Korea Institute of Ocean Science & Technology (KIOST).

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Correspondence to Kiejung Park or Jung-Hyun Lee.

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Cite this article

Roh, YR., Yim, HS., Park, K. et al. Molecular characterization of positively selected genes contributing aquatic adaptation in marine mammals. Genes Genom (2024). https://doi.org/10.1007/s13258-023-01487-2

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  • DOI: https://doi.org/10.1007/s13258-023-01487-2

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