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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Molecular Aging of Human Liver: An Epigenetic/Transcriptomic Signature
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Molecular Aging of Human Liver: An Epigenetic/Transcriptomic Signature

机译:人肝的分子老化:表观遗传/转录组签名

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The feasibility of liver transplantation from old healthy donors suggests that this organ is able to preserve its functionality during aging. To explore the biological basis of this phenomenon, we characterized the epigenetic profile of liver biopsies collected from 45 healthy liver donors ranging from 13 to 90 years old using the Infinium HumanMethylation450 BeadChip. The analysis indicates that a large remodeling in DNA methylation patterns occurs, with 8,823 age-associated differentially methylated CpG probes. Notably, these age-associated changes tended to level off after the age of 60, as confirmed by Horvaths clock. Using stringent selection criteria, we further identified a DNA methylation signature of aging liver including 75 genomic regions. We demonstrated that this signature is specific for liver compared to other tissues and that it is able to detect biological age-acceleration effects associated with obesity. Finally, we combined DNA methylation measurements with available expression data. Although the intersection between the two omic characterizations was low, both approaches suggested a previously unappreciated role of epithelialmesenchymal transition and Wnt-signaling pathways in the aging of human liver.
机译:来自旧健康捐赠者的肝移植的可行性表明,该器官能够在老化期间保持其功能。为了探讨这种现象的生物学基础,我们的特征在于使用Infinium人甲基化450珠芯片从13至90岁的45个健康肝脏供体中收集的肝脏活组织检查的表观遗传学曲线。分析表明,发生DNA甲基化图案的大重塑,发生8,823型患者相关的差异甲基化CPG探针。值得注意的是,这些相关的变化趋于60岁后升级,由Horvaths时钟确认。使用严格的选择标准,我们进一步确定了老化肝脏的DNA甲基化特征,包括75个基因组区域。我们证明,与其他组织相比,这种签名对于肝脏具有特异性,并且它能够检测与肥胖相关的生物学年龄 - 加速效应。最后,我们将DNA甲基化测量组合使用可用的表达数据。虽然两种OMIC表征之间的交叉点低,但两种方法都表明在人肝老化中的上皮性发育和Wnt信号通路的先前未被覆富的作用。

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