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The InDel variants of sheep IGF2BP1 gene are associated with growth traits.

Insulin-like growth factor 2 mRNA binding protein 1 (IGF2BP1) plays positive roles in the growth, proliferation of cells and early embryos development by binding mRNA targets. Recently, it had been shown that some polymorphic loci within IGF2BP1 gene were associated with growth traits in animals, especially in goats. Therefore, it has been hypothesized that some variants within IGF2BP1 gene may be also involved in growth traits of sheep. Nine insertion/deletion (InDel) mutations within IGF2BP1 were identified and three loci were polymorphic. Meanwhile, the association analyses between three InDels and growth traits were carried out in 745 sheep. The results showed that all InDels included 5 bp InDel in downstream region, 9 bp InDel in intron 4 and 15 bp InDel in intron 2 within IGF2BP1 were significantly associated with growth traits (p<.05). Furthermore, at 5 and 9 bp InDel loci, the individuals of heterozygous genotype (ID) had superior growing performance especially at body weight (BW). In all, three InDels were crucial variants correlated with growth traits and could be applied in marker-assisted selection (MAS) in sheep.