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Differences of cytosine methylation in parental lines and F1 hybrids of Large White×Meishan crosses and their effects on F1 performance

Published online by Cambridge University Press:  12 February 2007

Jiang Cao-De ,
Deng Chang-Yan  and
Xiong Yuan-Zhu
Jiang Cao-De
Affiliation:
Key Laboratory of Grazers and Herbivores of Chongqing, Southwest Agricultural University, Chongqing 400716, China
Deng Chang-Yan*
Affiliation:
Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China
Xiong Yuan-Zhu
Affiliation:
Key Laboratory of Pig Genetics and Breeding, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China
*
*Corresponding author: Email: dengchy@mail.hzau.edu.cn
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Abstract

In order to probe the effect of methylation on heterosis, the methylation-sensitive arbitrarily primed polymerase chain reaction (AP-PCR) technique was adopted to amplify pig genome DNA with 40 single arbitrary primers. The material involved parental lines and F1 hybrids of Large White×Meishan crosses. Nineteen differentially methylated sites with RsaI+HpaII digestion and 14 differentially methylated sites with RsaI+MspII digestion between parental lines and the hybrid were found. All fragments detected in this study were grouped into four classes: (1) the same level of methylation in both parental lines and the hybrid; (2) the same level of methylation in one parent and the hybrid; (3) an increased level of methylation in the hybrid compared to the parents, and (4) a decreased level of methylation in the hybrid. Five sites had significant effects on seven traits (P<0.05). Sequence analysis showed that three sequences had a high-identity match in GenBank (greater than 87%) and two sequences had no match in the database. The percentage of G+C in three sequences was over 50, and the observed/expected CpG of all sequences was above 0.6. Furthermore, one sequence contained G/C boxes. This study demonstrated that the sites in CpG islands within a gene promoter were differentially methylated in the hybrid compared to parental lines; methylated sites contributed differentially to F1 performance, showing that heterosis could benefit from either expression or repression of some genes.

Keywords

pigDNA methylationmethylation-sensitive AP-PCRCpG islands
Type
Research Article
Information
Chinese Journal of Agricultural Biotechnology , Volume 2 , Issue 3 , December 2005 , pp. 195 - 200
Copyright
Copyright © China Agricultural University and Cambridge University Press 2005

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