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Molecular characterization, expression, and apoptosis regulation of siva1 in protogynous hermaphrodite fish ricefield eel (Monopterus albus)

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Abstract

Siva1, which induces extensive apoptosis, has been well characterized. To elucidate the molecular function of Siva1 in ricefield eel, molecular characterization and phylogenetic analysis were performed, and the mRNA expression in the ovary at different developmental stages and ovary tissues exposed to H2O2 and Z-VAD-FMK in vitro were also evaluated. The results indicated that ricefield eel Siva1 was highly conserved and contains three conserved motifs, despite 83 amino acid differences upstream of the initiation codon. Phylogenetic analysis demonstrated that ricefield eel Siva1 clusters together with the Siva1 protein of the other fish, with high sequence homology with that of Lates calcarifer. Quantitative real-time polymerase chain reaction analysis showed high siva1 expression levels in the ovary and low expression levels in the liver. The higher mRNA levels of siva1 were detected in the IE and IM, and the lower siva1 mRNA levels were found in the OM, IL, and TE during gonadal development. Additionally, siva1 expression levels in the ovarian tissues were significantly increased at 1 h post incubation (hpi) with H2O2 and then significantly decreased at 2 hpi; however, siva1 expression was upregulated significantly at 4 and 8 hpi, similar to the patterns observed with caspase3, which was used as a molecular marker of apoptosis. Moreover, the siva1 mRNAs were elevated significantly than that in control groups at 1 hpi, but the expression of siva1 was down-regulated dramatically at 2, 4, and 8 hpi, which were similar with that of caspase3 expression profiles after Z-VAD-FMK incubation. What’s more, Pearson’s correlation coefficients showed strongly positive relationships between siva1 and caspase3. These findings suggest that Siva1 plays an important apoptosis role in gonadal development of ricefield eel.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This research was supported by the National Natural Science Foundation of China [grant numbers 31402286, 2015; 31972777, 2019].

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Contributions

Zhi He: conceptualization; formal analysis; investigation; writing, original and draft; supervision; and project administration. Faqiang Deng: conceptualization; methodology; investigation; resources; data statistics; and writing, original and draft. Zhijun Ma: investigation. Qian Zhang: investigation. Jiayang He: investigation. Lijuan Ye: resources. Hongjun Chen: resources. Deying Yang: supervision and validation. Liang He: investigation and resources. Jie Luo: conceptualization and investigation. Sen Xiong: writing: review. Taiming Yan: project administration; resources; supervision; validation; and writing, review and editing. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Taiming Yan.

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All procedures and investigations were reviewed and approved by the Animal Research and Ethics Committees of Sichuan Agricultural University and were performed in accordance with the guidelines of the committee (Approval No. 20190031).

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The authors declare no competing interests.

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Zhi He and Faqiang Deng are the co-first author, their contributed equally to this work.

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He, Z., Deng, F., Ma, Z. et al. Molecular characterization, expression, and apoptosis regulation of siva1 in protogynous hermaphrodite fish ricefield eel (Monopterus albus). Fish Physiol Biochem 47, 1585–1596 (2021). https://doi.org/10.1007/s10695-021-00997-8

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  • DOI: https://doi.org/10.1007/s10695-021-00997-8

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