Abstract
The insulin-like growth factor 1 (IGF1) gene was studied as a candidate gene for high prolificacy in sheep. Polymorphisms of 5′ regulatory region and all four exons of IGF1 gene were detected in Small Tail Han (n = 277), Hu (n = 58), Texel (n = 48) and Dorset (n = 46) sheep by PCR-RFLP and PCR-SSCP analysis. A microsatellite polymorphic site and a restriction fragment length polymorphism were shown in the 5′ regulatory region of IGF1 gene. The ewes with genotype 123/123 bp had 0.81 (P < 0.05) or 1.03 (P < 0.01) lambs more than those with genotype 125/125 bp or 125/127 bp, the ewes with genotype 123/125 bp had 0.46 (P < 0.05) or 0.68 (P < 0.01) lambs more than those with genotype 125/125 bp or 125/127 bp. In addition, there were two mutations (C1511G and A1513G) in 5′ regulatory region of IGF1 gene. The ewes with genotype BB or AB had 0.96 (P < 0.05) or 0.38 (P < 0.05) lambs more than those with genotype AA, but there were no significant differences between BB and AB genotypes (P > 0.05) in Small Tail Han sheep. These results preliminarily indicated that these polymorphisms of IGF1 gene could be used in molecular marker-assisted selection for sheep breeding programs.
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Acknowledgments
This work was supported by National Key Technology Research and Development (R&D) Program of China (No. 2008BADB2B01), by the earmarked fund for China Agriculture Research System (No. CARS-39), by National Key Basic R&D Program of China (No. 2006CB102105), and by Special Fund for Basic Scientific Research of Institute of Animal Science, Chinese Academy of Agricultural Sciences (No. 2010jc-9).
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He, J.N., Zhang, B.Y., Chu, M.X. et al. Polymorphism of insulin-like growth factor 1 gene and its association with litter size in Small Tail Han sheep. Mol Biol Rep 39, 9801–9807 (2012). https://doi.org/10.1007/s11033-012-1846-y
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DOI: https://doi.org/10.1007/s11033-012-1846-y