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        The association of haplotypes in IGFBP-3 gene promoter region and tissue expressions in three pig breeds

        Qingyan Wu,Hao Yu,Xibi Fang,Yunyun Cheng,Lijie Dong,Wenzhen Wei,Gang Wang,Haoyu Fu,Songcai Liu,Linlin Hao 한국통합생물학회 2016 Animal cells and systems Vol.20 No.6

        Bama Xiang pig (BM) and Tibetan mini-pig (TM) are used as experimental animals in China; however, the dwarf molecular mechanisms of these Chinese local pig breeds are unknown. IGFBP-3 affects animal growth, carcass and meat quality. The aim of this study was to identify the polymorphisms in the promoter of the IGFBP-3 and analyse their effect on the IGFBP-3 mRNA expression level in liver and muscle tissues. High-density single-nucleotide polymorphisms (SNPs) (31) and InDels (5) were detected in the promoter of the IGFBP-3 in the BM, TM and Junmu No. 1 White (JM, control) pig breeds from 114 individuals by re-sequencing. A perfect Linkage disequilibrium consisted of 13 SNPs was observed in the promoter region and 2 main haplotypes were identified, of which the h1 genotype (GCA-ATGTACATAT) was more prevalent in JM breed than in TM or BM breeds (P < .0001), h2 (ATGTGCACG--CGC) was the dominant haplotype in TM and BM breeds (P < .0001). Expression analysis showed that haplotype of the promoter region is highly associated with the IGFBP-3 mRNA expression level in liver and muscle tissues of pigs. The IGFBP-3 mRNA expression level was determined higher in the liver and muscle tissues of pigs with h2 genotype as compared to that in pigs with h1 genotype (P < .05). The results suggest that the SNPs and haplotypes in the promoter of the IGFBP-3 gene may serve as useful molecular markers for the body growth traits and the breeding in swine.

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