摘要
脂联素(Adiponectin)是至今发现的唯一与肥胖呈负相关的脂肪细胞特异性蛋白,是调控生物体的能量稳态、葡萄糖代谢和脂肪代谢的脂源性细胞因子之一。生物信息学分析发现,adiponectin基因启动子区-1500～-1350bp是CpG位点的富集区域。为了进一步研究脂联素基因的表达调控研究,文章从表观遗传学角度出发,通过Real-time PCR与甲基化特异性PCR(Methylation special PCR,MSP)的方法对脂联素基因的表达及其启动子区的甲基化状况进行了分析。结果表明,在adiponectin基因启动子区CG富集的区域(-1500～-1350bp)中,90日龄长白猪大多去甲基化(83%),90日龄蓝塘猪部分去甲基化(33%),成年蓝塘猪全是高度甲基化(100%),成年长白猪部分去甲基化(33%)。甲基化与去甲基化过程主要发生在某些特定CpG位点。脂联素基因在猪肌肉组织中以高度甲基化状态为主,这一结果与该基因在肌肉组织中表达量相吻合。以上结果提示,随个体发育,脂联素基因的甲基化状态随基因表达的波动呈现动态的过程,表现出与基因表达量波动基本一致的波动趋势。
Adiponectin, a cytokine hormone secreted exclusively by adipose tissue, has key roles in energy homeostasis and in metabolism of glucose and lipid. Adiponectin expression was negatively associated with obesity. Many CpG sites were found at the adiponectin promoter region （nucleotides -1500 ～ -1350 bp）. To further understand the regulation of pig adiponectin expression, the methylation status of pig adiponectin promoter and its mRNA expression were analyzed by methylation special PCR （MSP） and real-time PCR. At the adiponectin promoter region where CG enriches （nucleotides -1500 ～ -1350 bp）, the percentage of demethylation in Changbai pigs was 83%; and the percentages of demethylation in Lantang pigs at 90-day-old and adult stages were 33% and 100%, respectively. The process of methylation and demethylation mainly occurred in certain CpG sites. In muscle tissues, the promoter hypermethylation status of adiponectin gene was detected, which was consistent with the expression of this gene. These results suggested that the methylation of this gene experienced a dynamic process, with the development of individuals, which agreed with the fluctuating trend of gene expression.
出处
《遗传》
CAS
CSCD
北大核心
2009年第10期1013-1019,共7页
Hereditas（Beijing)
基金
科技部"973"项目(编号:2006CB102101)资助
