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Related Concept Videos

Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Euchromatin01:01

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging
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Chromatin structure and transposable elements in organismal aging.

Jason G Wood1, Stephen L Helfand1

  • 1Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University Providence, RI, USA.

Frontiers in Genetics
|December 24, 2013
PubMed
Summary

Epigenetic changes, particularly in heterochromatin, are linked to aging across species. This review explores how chromatin structure and RNA interference pathways influence organismal aging and longevity.

Keywords:
RNAichromatinepigenetics of agingheterochromatinhistone modificationsretrotransposonssilencingtransposable elements

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Area of Science:

  • Epigenetics and Molecular Biology
  • Gerontology
  • Cellular Aging

Background:

  • Epigenetic mechanisms play a crucial role in biological processes, including aging.
  • Heterochromatic silencing is associated with longevity in yeast.
  • Age-related chromatin alterations are observed in various model organisms and cell aging models.

Purpose of the Study:

  • To review recent evidence linking chromatin structure and function to aging.
  • To focus on the relationship between heterochromatin structure and organismal aging.
  • To explore the role of transposable elements and RNAi pathways in the aging process.

Main Methods:

  • Literature review of recent studies on epigenetics and aging.
  • Analysis of evidence from model organisms (yeast, C. elegans, Drosophila, mouse).
  • Examination of studies on replicative senescence and RNA interference pathways.

Main Results:

  • Accumulating evidence shows age-related changes in chromatin structure.
  • Expression of transposable elements and alterations in RNAi pathways are linked to aging.
  • Heterochromatin structure is a key factor in organismal aging.

Conclusions:

  • Chromatin structure, especially heterochromatin, is fundamentally involved in the aging process.
  • Understanding these epigenetic changes may offer insights into longevity and age-related decline.
  • Further research into RNAi and transposable elements in aging is warranted.