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http://dx.doi.org/10.5352/JLS.2013.23.2.190

Gene Promoter Variation of Phosphoglycerate Kinase, a Glucose Metabolism Enzyme, is a Biomarker for Selection of Disease-resistant Sea Squirt, Halocynthia Roretzi  

Cho, Hyun Kook (Biotechnology Research Center, National Fisheries Research and Development Institute)
Hur, Young Baek (Aquaculture Environment Institute)
Cheong, Jae Hun (Department of Molecular Biology, Pusan National University)
Publication Information
Journal of Life Science / v.23, no.2, 2013 , pp. 190-196 More about this Journal
Abstract
The sea squirt, Halocynthia roretzi, has experienced mass mortality due to softness syndrome. The identification of disease-induced genes can provide insights into the development of this syndrome. To identify the genes, we performed differentially expressed gene (DEG) analysis. The expression of the phosphoglycerate kinase (HrPGK) gene was significantly decreased in diseased sea squirts compared to normal ones. We confirmed the result of the DEG analysis through RT-PCR and real-time PCR. In addition, we detected single nucleotide polymorphisms at position -106 (A/T) and -254 (G/T) in the HrPGK gene promoter by genotyping analysis. At the -106 site of the HrPGK gene, the frequency of the AA allele in disease-resistant sea squirts was about two-fold higher than that of sensitive ones, and the frequency of the TT allele in the disease-resistant sea squirts was about six-fold lower. At the -254 site of the HrPGK gene, the frequency of the GT and the GG allele was approximately two-fold higher and two-fold lower, respectively, in the disease-resistant sea squirts compared to the disease-sensitive ones. Analysis of the relationship between the genotypic variation at the -106/-254 promoter and the expression of HrPGK mRNA showed that HrPGK mRNA expression was higher in the -106/-254 AA/GT genotype samples than in the -106/254 TT/GG genotype ones. These results show that sea squirts harboring the AA/GT genotype may have more resistance to mortality than the sea squirts with other genotypes.
Keywords
Halocynthia roretzi; phosphoglycerate kinase; polymorphism; sea squirt; softness syndrome;
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