不活跃的X染色体随着年龄的增长积累了广泛的表观遗传变异性
Yunfeng Liu1, Lucy Sinke1, Thomas H Jonkman1
1Molecular Epidemiology, Department of Biomedical Data Sciences, Leiden University Medical Center, Postzone S-5-P, 2333 ZC, Leiden, The Netherlands.
Clinical epigenetics
|August 25, 2023
概括
女性的表观遗传变化表明,随着年龄的增长,DNA甲基化变异性在不活跃的X染色体上增加,这表明X染色体不活化中断和衰老之间存在联系.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
- 衰老研究研究 衰老研究
背景情况:
- 表观遗传失调是衰老的一个关键特征.
- 在女性的X染色体无活化 (XCI) 中,DNA甲基化起着至关重要的作用.
- 随着年龄的增长,XCI的干扰可能会导致女性衰老.
研究的目的:
- 研究女性X染色体上DNA甲基化与年龄相关的变化.
- 区分甲基化水平和变化的与年龄相关的变化.
- 探索XCI在与年龄相关的表观遗传改变中的作用.
主要方法:
- 在使用Illumina 450k甲基化阵列对来自女性和男性的全血样本中的X染色体上9777个CPG的分析.
- 在全血和纯化单细胞数据集中的复制.
- 应用双重通用线性模型来识别与年龄相关的差异甲基化CpG (aDMCs) 和与年龄相关的可变甲基化CpG (aVMCs).
主要成果:
- 在女性中,aDMCs是罕见的,而aVMCs是丰富的 (n=987) 并积累在XCI受影响的区域,这表明起源于不活跃的X.
- aVMC的发现在纯化单细胞中具有很高的可复制性,独立于细胞组成.
- 在男性中,aDMCs在很大程度上是由细胞组成驱动的,aVMCs是罕见的.
结论:
- 不活跃X染色体上与年龄相关的DNA甲基化变化主要以增加的可变性为特征.
- 在非活性X染色体上甲基化变异性的积累可能是女性衰老的一个重要因素.
- 这项研究强调了在衰老研究中考虑甲基化变量的重要性.
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