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相关概念视频

Ribosome Profiling02:24

Ribosome Profiling

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
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相关实验视频

Updated: Sep 11, 2025

A Chromatin Assay for Human Brain Tissue
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在死后肋骨样本中的表观遗传年龄签名

Siqi Chen1, Changquan Zhang1, Dan Wen1

  • 1Department of Forensic Science, School of Basic Medical Sciences, Central South University, Changsha, Hunan Province, China.

Electrophoresis
|August 13, 2025
PubMed
概括

从分解的骨遗骸中进行法医年龄估计至关重要. 这项研究开发了肋骨的DNA甲基化模型,实现了高精度,并强调组织特异性表观遗传分析,以可靠地预测年龄.

关键词:
基因甲基化 法医年龄估计 尸体后肋骨样本 火烧测序

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Last Updated: Sep 11, 2025

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科学领域:

  • 法医科学 法医科学 法医科学
  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
  • 分子生物学分子生物学

背景情况:

  • 骨遗骸是常见的法医样本,需要估计年龄.
  • 以前的DNA甲基化研究没有评估骨特定年龄预测的准确性.
  • 肋骨是经常被检测到的法医标本,因此需要专门的年龄预测模型.

研究的目的:

  • 为死后肋骨样本开发和验证基于DNA甲基化的年龄预测模型.
  • 为了研究组织类型对DNA甲基化年龄预测精度的影响.
  • 探索骨衍生模型在不同骨元素中的潜在适用性.

主要方法:

  • 在ELOVL2,FHL2,KLF14和FAM123C基因中的八个CpG位点的DNA甲基化水平使用热测序进行了分析.
  • 模型是使用81个死后肋骨样本和112个死后血液样本开发的.
  • 进行了跨组织模型应用和胸骨,肋骨和额头骨样本的探索性分析.

主要成果:

  • 来自肋骨的年龄预测模型实现了0.908的R2 (MAD: 4.813年的训练,5.084年的测试).
  • 血源模型的准确性略高 (R2=0.927),但跨组织应用导致了显著的偏差.
  • 在探索性分析中,在胸骨,肋骨和额头骨样本中没有发现甲基化或年龄估计的显著差异.

结论:

  • 建立了基于DNA甲基化的强大的肋骨样本年龄预测模型.
  • 组织特定的校准对于法医应用中精确的表观遗传年龄估计至关重要.
  • 初步证据表明潜在的跨骨适用性,需要在更大的队列中进一步验证.