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Related Concept Videos

Necrosis01:16

Necrosis

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Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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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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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.
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Overview of Cell Death01:30

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Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
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Nucleosome Remodeling02:54

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Related Experiment Video

Updated: Jan 11, 2026

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
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Mechanically Regulated Biphasic Chromatin Dynamics during Cellular Necrosis.

Tanlin Wei1,2,3, Hong-Yu Luo1,3,4, Chao Jiang1,3

  • 1Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

The Journal of Physical Chemistry Letters
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Summary
This summary is machine-generated.

Necrosis involves active cellular regulation. This study reveals biphasic chromatin motion during cell death, driven by the cytoskeleton and nuclear changes, highlighting programmed cell death mechanisms.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Necrosis was traditionally viewed as passive cell death.
  • Research has focused on biochemical pathways, neglecting nuclear physical changes like chromatin dynamics.

Purpose of the Study:

  • To characterize spatiotemporal chromatin dynamics during necrosis.
  • To elucidate the regulatory mechanisms governing these physical changes in the nucleus.

Main Methods:

  • Single-particle tracking of telomeres.
  • Particle image velocimetry for global chromatin motion analysis.

Main Results:

  • Identified a biphasic chromatin motion pattern: initial deceleration followed by late acceleration.
  • Observed transient increase and subsequent decrease in intranuclear spatial heterogeneity.
  • Established a stage-specific regulatory model involving cytoskeletal restraint, nuclear swelling, and DNA fragmentation.

Conclusions:

  • Necrosis is a programmed process with active cellular regulation.
  • Cytoskeleton-mediated mechanical forces play a significant role in regulating chromatin dynamics during necrosis.
  • Uncovered a novel layer of mechanical regulation in programmed cell death.