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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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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.
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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
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DNA Distortion and Damage
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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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Somatic mutation as an explanation for epigenetic aging.

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Somatic mutations and DNA methylation changes are closely linked throughout life. This connection allows for mutation-based age prediction, mirroring results from epigenetic clocks.

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Area of Science:

  • Genomics
  • Epigenetics
  • Aging Research

Background:

  • Epigenetic clocks, based on DNA methylation, predict biological age.
  • Cytosine methylation is known to promote C-to-T mutations.

Approach:

  • Analyzed multimodal data from 9,331 human individuals.
  • Investigated the relationship between CpG mutations and DNA methylation patterns.
  • Developed mutation-based age prediction models.

Key Points:

  • CpG mutations correlate with methylation changes at mutated sites and surrounding regions (±10 kb).
  • Mutation-based age predictions align with epigenetic clock estimates.
  • Genomic loci with age-associated mutation accumulation show methylation patterns predictive of age.

Conclusions:

  • A strong coupling exists between somatic mutation accrual and age-related methylome alterations.
  • Somatic mutations provide a novel basis for aging clocks, complementing epigenetic approaches.