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Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Updated: Jul 9, 2025

Lipid Supplementation for Longevity and Gene Transcriptional Analysis in Caenorhabditis elegans
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Lipid Supplementation for Longevity and Gene Transcriptional Analysis in Caenorhabditis elegans

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在长肝中减缓表观遗传衰老.

Zulfiya G Guvatova1,2, Anastasiya A Kobelyatskaya2, Elena A Pudova2

  • 1Russian Clinical Research Center for Gerontology, Pirogov Russian National Research Medical University, Ministry of Healthcare of the Russian Federation, Moscow 129226, Russia.

International journal of molecular sciences
|December 9, 2023
PubMed
概括

长寿个体的表观遗传衰老速度较慢,他们的表观遗传年龄比他们的时间年龄年轻21年. 虚弱和性别并没有显著影响百岁老人的表观遗传年龄差异.

关键词:
通过DNA甲基化.老化的老化 衰老的老化表观遗传时钟的时间表.长时间的肝脏.烧烧测序 (pyrosequencing) 是一种测序方法.

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科学领域:

  • 老年学是一门学科.
  • 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.

背景情况:

  • 表观遗传衰老是衰老研究的一个关键领域.
  • 长寿的个体代表了成功的衰老,是全球研究的主题.
  • 了解百岁老人的表观遗传标记可以揭示长寿的机制.

研究的目的:

  • 估计长寿个体 (90岁以上) 的表观遗传年龄.
  • 为了比较健康和脆弱的长肝之间的表观遗传年龄.
  • 调查百岁老年人间表观遗传衰老中的潜在性别差异.

主要方法:

  • 利用贝卡尔特的基于血液的年龄预测模型.
  • 在4个特定的CpG位点 (ASPA,PDE4C,ELOVL2,EDARADD) 评估DNA甲基化状态.
  • 在长时间的肝脏中使用虚弱指数进行虚弱评估.

主要成果:

  • 长肝患者表现出表观遗传年龄明显低于他们的时间年龄 (约21岁).
  • 在健康和脆弱的长肝之间没有发现三角洲年龄的显著差异.
  • 在长时间的肝脏或对照中,没有发现表观遗传年龄的显著性别差异.

结论:

  • 百岁老人的表观遗传衰老似乎更慢,这表明生物衰老的延迟.
  • 在这种长寿队列中,虚弱状态和性别可能不是表观遗传年龄的主要决定因素.
  • 对百岁老人的表观遗传学的进一步研究对于了解衰老过程至关重要.