Abstract
The evolution of a two-chambered heart, with an atrium and a ventricle, has improved heart function in both deuterostomes (vertebrates) and some protostomes (invertebrates). Although studies have examined the unique structure and function of these two chambers, molecular comparisons are few and limited to vertebrates. Here, we focus on the two-chambered protostome heart of the mollusks, offering data that may provide a better understanding of heart evolution. Specifically, we asked if the atrium and ventricle differ at the molecular level in the mollusk heart. To do so, we examined two very different species, the giant African land snail (Lissachatina fulica) and the relatively small, aquatic yesso scallop (Mizuhopecten yessoensis), with the assumption that if they exhibited commonality these similarities would likely reflect those across the phylum. We found that, although the hearts of these two species differed histologically, their cardiac gene function enrichments were similar, as revealed by transcriptomic analysis. Furthermore, the atrium and ventricle in each species had distinct gene function clusters, suggesting an evolutionary differentiation of cardiac chambers in mollusks. Finally, to explore the relationship between vertebrate and invertebrate two-chambered hearts, we compared our transcriptomic data with published data from the zebrafish, a well-studied vertebrate model with a two-chambered heart. Our analysis indicated a functional similarity of ventricular genes between the mollusks and the zebrafish, suggesting that the ventricle was differentiated to achieve the same functions in invertebrates and vertebrates. As the first such study on protostomes, our findings offered initial insights into how the two-chambered heart arose, including a possible understanding of its occurrence in both protostomes and deuterostomes.
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Data availability
RNA-sequencing data are deposited in GEO under accession number GSE236112 (https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE236112).
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Acknowledgements
We thank Dr. Qiang Xing (Ocean University of China, MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences) for providing scallops; Dr. Jing Wang (Ocean University of China, Fang Zongxi Centre for Marine EvoDevo & MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences) for providing snails. This work was financially supported by Laoshan Laboratory (LSKJ202203204), the National Natural Science Foundation of China (31970506 and 32170541 to LZ; 31970475 and 32170832 to YS), and the Fundamental Research Funds for Central Universities, China (202012004 to LZ).
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Conceptualization, YS and LZ; investigation, RH, ML, XZ, YJ, JH, YH, MJ, JF, QJ, and YG; Scallop genomics data, SW; transcriptomic analysis, ML; writing-original draft preparation, ML, XZ, and RH; writing-review and editing, AA, YS, and LZ; project administration, YS and LZ; funding acquisition, YS and LZ.
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The authors declare no conflicts of interest. Authors Long Zhao and Shi Wang are members of the Editorial Board, but they were not involved in the review of or decision related to this manuscript.
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Lu, M., Hayat, R., Zhang, X. et al. Comparative analysis of the cardiac structure and transcriptome of scallop and snail, perspectives on heart chamber evolution. Mar Life Sci Technol 5, 478–491 (2023). https://doi.org/10.1007/s42995-023-00202-0
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DOI: https://doi.org/10.1007/s42995-023-00202-0