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Molecular Cloning, Mapping, and Polymorphism of the Porcine SCG2 gene

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Abstract

The secretogranin II (SCG2) gene is associated with the synthesis and secretion of follicle-stimulating hormone and luteinizing hormone. In the present study, we have determined the complete cDNA sequence of pig SCG2, which was submitted to GenBank with accession no. AY870646. Its complete open reading frame of 1,851 nucleotides encodes 616 amino acids. The predicted protein shares 80–87% identity with mouse, human, and bovine SCG2 proteins, and all four species share almost complete identity in the secretoneurin and EM66 domains. Pig SCG2 is a protein of 589 amino acids and 68,132 Da, preceded by a signal peptide of 27 residues. It contains nine pairs of dibasic residues, which are used as potential cleavage sites for generation of physiologically active peptides. Analysis of the SCG2 gene across the INRA-Minnesota porcine radiation hybrid panel indicates close linkage with microsatellite marker SW2608, located on Sus scrofa chromosome 15 (SSC15) q25, which harbors several QTL for ovulation rate and meat quality. Comparative sequencing and EST analysis revealed nine SNPs in porcine SCG2 cDNA, including seven SNPs in the coding region and two SNPs in the 3′ UTR. Four nonsynonymous SNPs (G622A, G1671T, C1718T, and A1790C) resulted in amino acid substitutions of Ala→Thr, Glu→Asp, Pro→Leu, and Asn→Thr, respectively.

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Acknowledgments

This research was funded by the Major State Basic Research Development Program of China, project no. 2006CB102100.

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Authors and Affiliations

  1. School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510640, P.R. China

    Hong-Li Du

  2. College of Animal Science, South China Agricultural University, Guangzhou, 510642, P.R. China

    Hong-Li Du, Jing Chen, Yu-Shan Zhang & Xi-Quan Zhang

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  1. Hong-Li Du
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Correspondence to Xi-Quan Zhang.

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Du, HL., Chen, J., Zhang, YS. et al. Molecular Cloning, Mapping, and Polymorphism of the Porcine SCG2 gene. Biochem Genet 46, 369–379 (2008). https://doi.org/10.1007/s10528-008-9153-y

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