›› 2015, Vol. 42 ›› Issue (4): 973-979.doi: 10.16431/j.cnki.1671-7236.2015.04.030

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Relationship between Genomic DNA Methylation and Body Weight of Congjiang Xiang Pig

LIN Ru-tao1,2, RAN Xue-qin2, WANG Jia-fu1,3   

  1. 1. Institute of Agricultural Bioengineering, Guizhou University, Guiyang 550025, China;
    2. College of Animal Science, Guizhou University, Guiyang 550025, China;
    3. College of Life Sciences, Guizhou University, Guiyang 550025, China
  • Received:2014-12-18 Online:2015-04-20 Published:2015-05-05

Abstract: To explore the epigenetics mechanism for the slow growth in Xiang pig, 60 piglets in 20 days were divided into two groups with high or low body weight. The methylation modification at cytosine in the genomic DNA from blood and liver was investigated by methylation-sensitive amplifying polymorphism (MSAP) technique. A total of 5 977 sites were counted based on MSAP results. Compared to the low-weight group, the total DNA methylation level in high-weight group was lower. Although the half DNA methylation levels in blood samples were higher than that in liver samples, the both/total DNA methylation levels in blood were lower than that in liver. It showed that the total DNA methylation level tended to decrease as the increasing of body weight. Five specific fragments from A1 to A5 were sequenced which were differently methylated between two groups. Both of A1 and A4 detected from high-weight group while the others got from low-weight group. Fragment A1 and A2 detected from blood genomic DNA and A3 to A5 from liver samples. A3 was apart far from two genes without coding region for RNA. The others were located in genes related with metabolism and immune. The results indicated that genomic DNA methylation level was different among individual piglet and related with the body weight of Xiang piglet in 20 days. The four specific methylation fragments would be useful for research on the mechanism of growth in Xiang pig breed.

Key words: Congjiang Xiang pig; genomic methylation; specific fragments; body weight

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