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Related Concept Videos

Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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...
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Nucleosome Remodeling02:54

Nucleosome Remodeling

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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.
Nucleosome remodeling complex
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
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Heterochromatin02:38

Heterochromatin

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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.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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Euchromatin01:01

Euchromatin

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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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Related Experiment Video

Updated: May 22, 2025

Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells
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High Mobility Group A1 Chromatin Keys: Unlocking the Genome During MPN Progression.

Linda M S Resar1, Li Z Luo1

  • 1Departments of Medicine (Hematology), Oncology, Pathology and Institute for Cellular Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

International Journal of Molecular Sciences
|March 13, 2025
PubMed
Summary

High Mobility Group A1 (HMGA1) is upregulated in myeloproliferative neoplasms (MPNs) and drives progression to leukemia. Targeting HMGA1 may offer a new therapeutic strategy for MPN patients.

Keywords:
High Mobility Group A1 (HMGA1)MPN progressionchromatin keysepigenetic regulatortranscriptional networks

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Area of Science:

  • Hematology
  • Oncology
  • Epigenetics

Background:

  • Myeloproliferative neoplasms (MPNs) can transform into lethal leukemia.
  • Mechanisms driving MPN progression are not fully understood.
  • High Mobility Group A1 (HMGA1) is an epigenetic regulator normally silenced in differentiated cells.

Purpose of the Study:

  • To investigate the role of HMGA1 in MPN progression.
  • To identify HMGA1 as a potential therapeutic target for MPNs.

Main Methods:

  • Analysis of HMGA1 expression in MPN patients.
  • Preclinical models to assess HMGA1 function in MPN evolution.

Main Results:

  • HMGA1 is upregulated with MPN progression, particularly after transformation to myelofibrosis (MF) or acute myeloid leukemia (AML).
  • HMGA1 is aberrantly re-expressed in JAK2-mutant MPNs.
  • HMGA1 is required for MPN evolution in preclinical models.

Conclusions:

  • HMGA1 acts as a "chromatin key" unlocking genomic regions driving clonal expansion and progression in MPNs.
  • HMGA1 is a key driver of MPN progression.
  • HMGA1 represents a promising therapeutic target for MPNs.