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Novel single nucleotide polymorphisms of insulin-like growth factor-binding protein 7 (IGFBP7) gene significantly associated with growth traits in striped catfish (Pangasianodon hypophthalmus Sauvage, 1878)

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Abstract

Breeding program to improve economically important growth traits in striped catfish (Pangasianodon hypophthalmus) requires effective molecular markers. This study was conducted to identify single nucleotide polymorphisms (SNPs) of Insulin-like Growth Factor-Binding Protein 7 (IGFBP7) gene which plays multiple roles in regulating growth, energy metabolism and development. The association between SNPs in IGFBP7 gene and growth traits in striped catfish was analyzed in order to uncover the SNPs that have potential to be valuable markers for improving growth traits. Firstly, fragments of IGFBP7 gene from ten fast-growing fish and ten slow-growing fish were sequenced in order to discover SNPs. After filtering the detected SNPs, an intronic SNP (2060A > G) and two non-synonymous SNPs (344 T > C and 4559C > A) causing Leu78Pro and Leu189Met in protein, respectively, were subjected to further validated by individual genotyping in 70 fast-growing fish and 70 slow-growing fish using single base extension method. Our results showed that two SNPs (2060A > G and 4559 C > A (p. Leu189Met)) were significantly associated with the growth in P. hypophthalmus (p < 0.001), thus being candidate SNP markers for the growth traits of this fish. Moreover, linkage disequilibrium and association analysis with growth traits of haplotypes generated from the 3 filtered SNPs (344 T > C, 2060 A > G and 4559 C > A) were examined. These revealed that the non-coding SNP locus (2060A > G) had higher genetic diversity at which the G allele was predominant over the A allele in the fast-growing fish. Furthermore, the results of qPCR showed that expression of IGFBP7 gene with genotype GG (at locus 2060) in fast-growing group was significantly higher than that with genotype AA in slow-growing group (p < 0.05). Our study provides insights into the genetic variants of IGFBP7 gene and useful data source for development molecular marker for growth traits in breeding of the striped catfish.

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All data generated or analysed during this study are included in this published article [and its supplementary information files].

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Acknowledgements

This work is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 106.05-2017.29 to Oanh Thi Phuong Kim.

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Oanh TP Kim designed the project. Sang VN prepared for sampling. Trang THT, Hoang ST, BTNL and H–AV extracted DNA, RNA, PCR, qPCR and Sequencing. Trang THT and HST performed multiplex SNaPshot assay. Oanh TK and Trang TH Tran analyzed SNP data and transcriptional expression data. Oanh TP Kim and Trang TH Tran prepared the manuscript. All authors edited and commented on the manuscript.

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Correspondence to Oanh Thi Phuong Kim.

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Communicated by Joan Cerda.

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Tran, T.T.H., Tran, H.S., Le, B.T.N. et al. Novel single nucleotide polymorphisms of insulin-like growth factor-binding protein 7 (IGFBP7) gene significantly associated with growth traits in striped catfish (Pangasianodon hypophthalmus Sauvage, 1878). Mol Genet Genomics 298, 883–893 (2023). https://doi.org/10.1007/s00438-023-02016-2

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  • DOI: https://doi.org/10.1007/s00438-023-02016-2

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