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Related Concept Videos

Position-effect Variegation02:32

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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.
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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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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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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.
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Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Differential oligomerization regulates PHF13 chromatin affinity and function.

Francesca Rossi1, Alexandre P Magalhaes2, Rene Buschow3

  • 1Chromatin Structure and Function Group, Max Planck Institute for Molecular Genetics, 63-73 Ihnestrasse, Berlin14195, Germany.

Nucleic Acids Research
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Summary
This summary is machine-generated.

PHF13 protein oligomerization impacts chromatin structure. Its ordered regions promote chromatin compaction, while disordered regions drive liquid-like condensates, revealing a balance regulating epigenetic functions.

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Area of Science:

  • Epigenetics and Chromatin Biology
  • Molecular Cell Biology

Background:

  • PHF13 (Paired-like homeodomain 13) is an epigenetic reader regulating chromatin processes.
  • Aberrant PHF13 regulation is linked to various cancers and epithelial-to-mesenchymal transition.
  • Understanding PHF13's intrinsic regulation is crucial for its role in chromatin dynamics.

Purpose of the Study:

  • To investigate the intrinsic mechanisms regulating PHF13's chromatin affinity and functions.
  • To elucidate how PHF13's structure influences its interaction with chromatin.

Main Methods:

  • Analysis of PHF13 oligomerization via ordered and disordered regions.
  • Assessment of chromatin compaction using optical microscopy.
  • Investigation of phase separation behaviors (PPPS and LLPS).

Main Results:

  • PHF13 oligomerization via ordered domains increases chromatin avidity, promoting polymer-polymer phase separation (PPPS) and chromatin inaccessibility.
  • PHF13 overexpression (3-5 fold) leads to global chromatin compaction, dependent on ordered regions.
  • PHF13 self-association via disordered regions reduces chromatin affinity, forms liquid-liquid phase separated (LLPS) condensates, and impacts gene expression.

Conclusions:

  • PHF13 exhibits a balance between ordered and disordered regions, dictating its chromatin interaction modes.
  • PHF13 can transition between PPPS and LLPS states, dynamically regulating chromatin structure and function.
  • This dual phase separation capability offers new insights into epigenetic regulation and cancer biology.