Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (2): 331-343.doi: 10.11843/j.issn.0366-6964.2021.02.006

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Polymorphisms in the 5'Regulatory Region of PLAG1 Gene and Their Association with Early Body Weight of Hu Sheep

GUO Xiaoxiao1,2, LI Yinxia2,3, WANG Yue2, ZHANG Han2, ZHANG Jun2, QIAN Yong2, MENG Chunhua2, WANG Huili2, ZHONG Jifeng2, CAO Shaoxian1,2,3*   

  1. 1. College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China;
    2. Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;
    3. The Jiangsu Provincial Platform for Conservation and Utilization of Agricultural Germplasm, Nanjing 210014, China
  • Received:2020-06-30 Online:2021-02-23 Published:2021-02-24

Abstract: This experiment aimed to clone the sequence of the 5'regulatory region of Hu sheep's PLAG1 gene, analyze the relationship between its polymorphisms and the early body weight, and look for the molecular markers for assisted selection of growth traits of Hu sheep. The 5'RACE method was used to identify the transcription initiation site of PLAG1 of Hu sheep. Four hundred fifty six weaned Hu sheep were selected as research objects, the nucleotide polymorphisms in the PLAG1 5' regulatory region were screened by cloning and sequencing, SPSS 18.0 was used to analyze the influence of different genotypes on the birth weight and weaning weight of Hu sheep. The results showed that the transcription initiation site was located at g.30535 locus of the PLAG1 gene. Fifteen SNPs were identified with 3 genotypes in PLAG1 5'regulatory region of Hu sheep population, and these SNPs were in Hardy-Weinberg equilibrium. Correlation analysis showed that the birth weight of Hu sheep with AA, GG, CC and AA genotypes at g.28888A>T, g.28901G>T, g.30802C>T and g.30825A>G loci, respectively were significantly higher than those of Hu sheep with corresponding heterozygous genotypes (P<0.05), and weaning weight of Hu sheep with CC genotype at g.30737T>C locus was significantly lower than that of Hu sheep with TC genotype (P<0.05). Linkage analysis showed that g.28888A>T, g.28901G>T, g.28913T>A, g.29717G>C, g.29724A>C, g.29725G>A, g.29768T>C, g.29771A>G, g.30141T>A, G.30144A>G, g.30691C>A, g.30694A>T, g.30737T>C, g.30802C>T, g.30825A>G were closely linked and detected 18 haplotypes. Further association analysis showed that 5 haplotypes with large sample size among them were associated with early body weight, the birth weight of Hu sheep with AAGGTAGGAAGGTTAATTAACCAATCCCAA haplotype was significantly higher than that of Hu sheep with ATGTTAGCACGATCAGTAAGCAATTCCTAG haplotype (P<0.05), the its weaning weight was significantly higher than that of AAGGAAGGAAGGTTAATTAACCAACCCCAA haplotype (P<0.05). The result indicated that there were 15 linkage SNPs loci in the 5' regulatory region of PLAG1 gene in Hu sheep population; g.28888A>T, g.28901G>T, g.30802C>T, g.30825A>G loci were significantly associated with birth weight (P<0.05); g.30737T>C locus was significantly associated with weaning weight (P<0.05); AAGGTAGGAAGGTTAATTAACCAATCCCAA haplotype was significantly associated with birth weight and weaning weight (P<0.05). All these data demonstrated that PLAG1 gene could be used as a candidate genetic marker for the growth traits selection of Hu sheep.

Key words: Hu sheep, PLAG1 gene, 5'regulatory region, SNPs, birth weight, weaning weight

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