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Duplication of Chromatin Structure02:05

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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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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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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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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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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
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Chromatin structure changes during various processes from a DNA sequence view.

Hui Quan1, Ying Yang1, Sirui Liu1

  • 1Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

Current Opinion in Structural Biology
|November 26, 2019
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Summary
This summary is machine-generated.

Chromatin structure changes with age, showing increased segregation and cell-specific contacts. DNA sequence influences these changes, alongside factors like cell cycle and proteins.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Chromatin, composed of DNA and proteins, forms the genome's 3D structure.
  • DNA sequence information plays a crucial role in organizing chromatin architecture.
  • Understanding chromatin structure is key to comprehending genome function.

Purpose of the Study:

  • To review changes in chromatin structure across biological processes from a DNA sequence perspective.
  • To explore the influence of various factors on chromatin organization.
  • To highlight the roles of proteins in chromatin structure.

Main Methods:

  • Review of existing literature on chromatin structure and DNA sequence.
  • Analysis of high-precision, genome-wide chromosome contact patterns.
  • Discussion of factors affecting chromatin organization.

Main Results:

  • Chromatin exhibits increased domain segregation from birth to senescence.
  • Cell identity is associated with specific cross-domain contacts.
  • Chromatin segregation patterns are dependent on cell stage and genomic distance.
  • Cell cycle, temperature, nuclear lamina, and nucleolus impact chromatin structure.
  • Transcription factors and other proteins are vital for proper chromatin organization.

Conclusions:

  • DNA sequence is a fundamental determinant of dynamic chromatin structure.
  • Chromatin organization undergoes significant, regulated changes throughout life and across cell types.
  • Proteins play essential roles in maintaining chromatin integrity and function.