从出生到性成熟的rDNA拷贝数变化和甲基化
Alina Michler1, Sarah Kießling1, Jana Durackova1
1Institute of Human Genetics, Julius Maximilians University, 97074 Würzburg, Germany.
Aging
|June 17, 2025
概括
核糖体DNA拷贝数和甲基化与发育迟缓无关. 核糖体DNA活动的年龄相关变化始于性成熟后,而不是儿童时期.
科学领域:
- 遗传学 是一个遗传学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- 核糖体DNA (rDNA) 转录对于核糖体生物发生和蛋白质合成至关重要.
- 异常的rDNA拷贝数 (CN) 或甲基化模式与各种疾病有关.
- 了解发育过程中的rDNA调节对于识别疾病机制至关重要.
研究的目的:
- 调查rDNA转录单元 (TU) 拷贝数和甲基化在综合征性发育迟缓 (DD) 中的作用.
- 为了分析与年龄相关的rDNA甲基化和从出生到年轻成人个体的活跃副本的变化.
- 为了确定rDNA CN或甲基化水平是否在健康个体和DD患者之间有所不同.
主要方法:
- 采用滴滴数字PCR和深度二硫酸盐测序来量化绝对rDNA拷贝数 (CN) 和甲基化水平.
- 分析了来自139名健康个体和141名未解决综合征DD的个体的血液样本 (年龄范围:0.0218.4岁).
- 评估的促进物甲基化,绝对的CN,极端的CN和低甲基化 (活性) 的CN.
主要成果:
- 在健康个体和DD个体之间,没有发现平均促进物甲基化,绝对CN,极端CN或活性CN的显著差异.
- 绝对rDNACN (中位数410) 从出生到性成熟保持稳定,与促进物甲基化有很强的相关性.
- 与成年人不同的是,在长达20年的时间里,没有观察到与年龄相关的活跃rDNA拷贝损失;非甲基化拷贝随着年龄的增长而增加.
结论:
- rDNA拷贝数不太可能是综合征发育迟缓的主要因素.
- 衰老的特征,与年龄相关的rDNA促进物甲基化和活性rDNATU的衰退,在性成熟后开始.
- 儿童和青少年时期的rDNA调节与成年期的调节有很大的不同.
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