ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2013, Vol. 44 ›› Issue (9): 1363-1370.doi: 10.11843/j.issn.0366-6964.2013.09.005

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Expression and Association between SNPs and Growth Traits of IGF-Ⅰ Gene in Sheep

ZHOU Ming-liang1, ZHANG Xiang-yu3, QI Song-zhi2, WANG Qi2, WU Deng-jun2*,YANG Ping-gui1   

  1. (1. Sichuan Academy of Grassland Science,Chengdu 611743,China; 2. College of Animal Science and Technology, Sichuan Agricultural University,Ya’an 625014,China; 3. Sichuan Animal Science Academy,Chengdu 610066,China)
  • Received:2013-04-09 Online:2013-09-23 Published:2013-09-23

Abstract:

 This experiment was conducted to study the expression patten of IGF-gene regulating growth and development of sheep and correlation of its SNPs with growth traits in sheep. The IGF-1 gene expression change of IGF-in brain,musle,skin,liver and heart were detected at six growth stages(15,60,105,150,195,240 days) by qRT-PCR approach and the correlation of SNPs of IGF-gene with growth traits were analyzed by SSCP method in Liangshan Semi-wool sheep population. The results showed that the first inflection point of the expression of IGF-gene in musle, skin, brain, liver and heart tissues was at 105 day and the second inflection point was at 195 day without the liver tissue. From 15 to 105 day, the expression of IGF-1 gene in musle, brain and liver tissues decreased at 60 day, and then increased at 105 day, however, it is not significantly different at 15 and 60 day, and increased significantly at 105 day in skin and heart tissues.After 105 day, the expression of IGF- were degraded in all of the tissues at 150 day,and the expression in liver tissue was decreased gradually from 105 to 240 day, but the expression in skin and brain tissues were higher at 195 day than that at 150 and 240 day, and no difference at among 150, 195 and 240 day in musle and heart tissues.The two SNPs which were detected with 587 Liangshan Semi-wool sheep were moderate polymorphism. The SNP of the P-1 primer affected significantly birth weight(P<0.05) and the SNP of the P-2 primer affected significantly weaning weight and the weaning daily gain(P<0.05). The results suggest that the expression of IGF-in all tissues have the similar expression patterns,and strong correlation between SNPs of IGF-1 and confirmed the early growth traits provide theoretical basis for the growth regulation and can be applied to assisted selective breeding with the SNPs in Liangshan Semi-wool sheep.

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