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Related Concept Videos

Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Epigenetic Regulation01:37

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

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Related Experiment Video

Updated: Jun 25, 2026

Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging
09:10

Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging

Published on: January 30, 2026

Epigenetics and aging: status, challenges, and needs for the future.

Arnold Kahn1, Mario F Fraga

  • 1San Francisco Coordinating Center, California Pacific Medical Center, 185 Berry Street, San Francisco, CA 94107, USA. arnold.kahn@ucsf.edu

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|March 3, 2009
PubMed
Summary
This summary is machine-generated.

Epigenetics research in aging is expanding, but aging heterogeneity poses challenges. New experimental and computational approaches are needed to effectively study aging variations.

Related Experiment Videos

Last Updated: Jun 25, 2026

Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging
09:10

Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging

Published on: January 30, 2026

Area of Science:

  • Gerontology
  • Epigenetics
  • Molecular Biology

Background:

  • Growing interest in epigenetics and aging, evidenced by increasing publications.
  • Rapid technological advancements support epigenetic research in aging.
  • Aging is a heterogeneous process, even with uniform genetics and environment.

Purpose of the Study:

  • To address the challenges in studying the heterogeneous nature of aging.
  • To highlight the need for experimental approaches that account for aging variability.
  • To emphasize the importance of bioinformatics and systems biology in aging research.

Main Methods:

  • Discusses the need for improved experimental approaches in aging research.
  • Highlights the importance of selecting appropriate animal models, cell, or tissue sampling.
  • Mentions the necessity of techniques for analyzing small samples in situ and longitudinally.

Main Results:

  • Aging exhibits significant heterogeneity in phenotype expression within and between individuals.
  • Current experimental approaches may not fully capture the complexities of aging.
  • Large datasets generated from aging studies necessitate advanced analytical tools.

Conclusions:

  • There is a pressing need for experimental strategies that acknowledge and manage aging heterogeneity.
  • The integration of bioinformatics and systems biology is crucial for analyzing complex aging data.
  • Future research must adopt innovative methods to effectively study the multifaceted aging process.