ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (4): 688-700.doi: 10.11843/j.issn.0366-6964.2019.04.002

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Association of the PDGF-D Gene Genetic Variation with Sheep Tail Traits

LI Qing1, WANG Huihua1, LU Zengkui1,2, JIN Meilin1, CHU Mingxing1*, WEI Caihong1*   

  1. 1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Gansu Agricultural University, Lanzhou 730070, China
  • Received:2018-10-22 Online:2019-04-23 Published:2019-04-23

Abstract:

We studied the possibility of the PDGF-D gene to be a novel candidate gene affecting the sheep tail traits, in order to verify the previous results, as well as to find new molecular markers related to the sheep tail traits. In the 533 sheep experiment group (Hu sheep, Tibetan sheep, Dorper sheep×Hu sheep), 30 DNA samples with a fixed concentration from Hu sheep and Tibetan sheep respectively were selected to construct the DNA pool, primers were designed to amplify exons and 1 000 bp of upstream and downstream regulatory regions. PCR products were tested and the target segments were sequenced. Sequenom Mass-array technology was used to genotype the detected SNPs. Haploview 4.1 was used to construct haplotypes and analyze linkage disequilibrium of the polymorphic loci. Association analysis between the SNPs of PDGF-D gene and the tail traits was performed using SPSS 19.0 software. The results showed that 6 SNPs were detected. rs5, rs27 and rs28 were significantly related to tail length, tail width and tail perimeter(P<0.05). rs6 and rs19 were only significantly involved in tail length(P<0.05). rs13 was significantly related to tail width and tail perimeter(P<0.05). The result of linkage disequilibrium analysis showed that there was close linkage from rs6 to rs13. Meanwhile, the association analysis of combined genotypes of rs6-rs13 with tail traits revealed that individuals with CCGG combined genotype were significantly lower than the individuals with other combined genotypes in tail length, tail width and tail perimeter (P<0.05 or P<0.01), but the number of individuals with CCGG was less in population. The results indicate that PDGF-D gene has significant effect on sheep tail traits, and the SNPs of PDGF-D gene are potentially valuable as genetic markers for breeding. The CCGG genotype can be considered as the potential molecular marker to breed small-tailed sheep. The amount of individuals with CCGG combined genotype should be expanded further.

Key words: PDGF-D gene, sheep tail traits, polymorphism, association analysis, linkage disequilibrium analysis

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