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Related Concept Videos

Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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 DNA...
Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...

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Related Experiment Video

Updated: Jul 7, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

MRGing chromatin dynamics and cellular senescence.

Sandra N Garcia1, Olivia Pereira-Smith

  • 1Department of Cellular and Structural Biology, STCBM 3.100, The University of Texas Health Sciences Center at San Antonio, 15355 Lambda Drive, San Antonio, TX 78245, USA. sandyngarcia@gmail.com

Cell Biochemistry and Biophysics
|January 31, 2008
PubMed
Summary

The Morf4-Related Gene (MRG) family proteins interact with chromatin modifiers and influence cell division. This review explores their role in chromatin dynamics and cellular senescence, a key process in aging.

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Techniques to Induce and Quantify Cellular Senescence
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Measuring Single-Cell Aging with an Imaging-based Biomarker of Chromatin and Epigenetic Aging
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Induction and Validation of Cellular Senescence in Primary Human Cells
08:18

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Normal cells have limited division capacity, entering replicative senescence.
  • Cellular stresses like DNA damage and chromatin changes can trigger senescence.
  • Histone modifications are crucial for chromatin structure, impacting cell proliferation and senescence.

Purpose of the Study:

  • To review the function of the Morf4-Related Gene (MRG) family in chromatin dynamics.
  • To elucidate the role of MRG proteins in cellular senescence.

Main Methods:

  • Literature review of studies on MRG family proteins.
  • Analysis of MRG interactions with chromatin-modifying complexes.
  • Examination of MRG's influence on tumor suppressors like p53 and retinoblastoma (Rb).

Main Results:

  • MRG proteins interact with histone acetyltransferase (HAT) and histone deacetylase (HDAC) complexes.
  • MRG proteins interact with the retinoblastoma (Rb) protein.
  • The MRG gene family was identified through its ability to induce senescence.

Conclusions:

  • MRG proteins are key players in regulating chromatin structure and dynamics.
  • The MRG family significantly impacts cellular senescence pathways.
  • Understanding MRG proteins offers insights into cell cycle control and aging.