›› 2018, Vol. 45 ›› Issue (8): 2236-2246.doi: 10.16431/j.cnki.1671-7236.2018.08.024

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Genetic Polymorphism Analysis of BMP15 and GDF9 Genes in Six Sheep Breeds

WU Cuiling1,2, ZONG Xinglong1,2, ZHAO Zhuo1, ZHAO Yunhui1, ZHAI Bo1, ZHANG Mingxin1, WANG Chunxin1   

  1. 1. Jilin Academy of Agricultural Sciences, Gongzhuling 136100, China;
    2. Jilin Agricultural University, Changchun 130000, China
  • Received:2018-01-02 Online:2018-08-20 Published:2018-08-15

Abstract:

This study was aimed to detect the gene polymorphism of bone morphogenetic protein 15(BMP15) and growth differentiation factor 9 (GDF9) genes in Xinji Fine-wool sheep,Northeast Fine-wool sheep,Chinese Merino(Mulley type) sheep,Dorper×Han crossbred sheep (F1),Dorper×Han crossbred sheep (F3) and White Dorper sheep,which would provide a theoretical basis for marker-assisted selection and breeding for prolificacy in sheep.A total of 378 individuals from six sheep breeds were used to study the polymorphism of BMP15 and GDF9 genes by PCR-SSCP.Secondary structure and tertiary structure of proteins were predicted using DNAStar and I-TASSER.Gene frequency,genotype frequency,Hardy-Weinberg equilibrium,heterozygosity (He),homozygous (Ho),number of effective alleles (Ne) and polymorphic information content (PIC) were calculated.The correlation was analyzed between BMP15 gene polymorphism and litter size in Xinji Fine-wool sheep by GraphPad Prism 6 software.The results showed that the polymorphism was found in P1 primer amplification fragment of BMP15 gene,there were three genotypes of AA,AC and CC in six breeds.This mutation was a 58-60 bp (CTT) deletion in exon 1 of BMP15 gene.According to χ2 test,Xinji Fine-wool sheep,Dorper×Han crossbred sheep (F3) and White Dorper sheep were not in Hardy-Weinberg equilibrium.There was no significant difference in the average litter size of different genotypes in Xinji Fine-wool sheep (P>0.05).The polymorphism was found in P2 primer amplification fragment of GDF9 gene.There were three genotypes of DD,DE and EE in six breeds,and there were only one genotype in Xinji Fine-wool sheep.This mutation was a T→C conversion at 477 bp on GDF9 gene exon 2 which didn't lead to amino acid change.According to χ2 test,five breeds (except for Xinji Fine-wool sheep) were in Hardy-Weinberg equilibrium.The results indicated that the GDF9 gene T477C mutation couldn't be used as a genetic marker for multiple fetal traits in Xinji Fine-wool sheep.

Key words: sheep; BMP15 gene; GDF9 gene; polymorphism

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