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Related Concept Videos

Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Epigenetic Regulation01:37

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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...
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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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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Updated: Jul 5, 2025

Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
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Biologically informed deep learning for explainable epigenetic clocks.

Aurel Prosz1, Orsolya Pipek2, Judit Börcsök1,3

  • 1Danish Cancer Institute, Copenhagen, Denmark.

Scientific Reports
|January 15, 2024
PubMed
Summary
This summary is machine-generated.

We developed XAI-AGE, an explainable AI model that accurately predicts biological age using DNA methylation. This model not only predicts age but also reveals key biological processes driving aging.

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Area of Science:

  • Gerontology
  • Bioinformatics
  • Artificial Intelligence

Background:

  • Aging is linked to accumulating damage and chronic diseases.
  • Epigenetic mechanisms like DNA methylation play a role in aging.
  • Current epigenetic clocks predict biological age but lack interpretability.

Purpose of the Study:

  • To develop a novel, explainable deep neural network model (XAI-AGE) for accurate biological age prediction.
  • To enhance understanding of the biological processes governing aging.
  • To provide biologically meaningful insights from age prediction models.

Main Methods:

  • Developed XAI-AGE, a biologically informed, explainable deep neural network.
  • Applied the model across multiple tissue types for age prediction.
  • Compared XAI-AGE performance against existing age prediction models.

Main Results:

  • XAI-AGE accurately predicts biological age across various tissues.
  • The model outperforms first-generation epigenetic predictors.
  • XAI-AGE achieves performance comparable to current deep learning models.
  • The model allows inference of biologically meaningful insights into aging processes.

Conclusions:

  • XAI-AGE offers a powerful tool for accurate and interpretable biological age prediction.
  • The model advances our understanding of the molecular mechanisms underlying aging.
  • Explainable AI holds significant potential for future gerontological research.