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Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing 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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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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Electrostatic encoding of genome organization principles within single native nucleosomes.

Sangwoo Park1, Advait Athreya2, Gustavo Ezequiel Carrizo3

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

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Summary

Individual nucleosomes possess inherent biophysical properties, termed condensability, that dictate their location within the genome and correlate with gene activity. This intrinsic nucleosome information guides genome organization and gene expression.

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Area of Science:

  • * Molecular Biology and Biophysics: Investigating the fundamental properties of chromatin organization.

Background:

  • * The eukaryotic genome is organized into distinct compartments (A/euchromatin and B/heterochromatin) based on chromatin structure.
  • * The role of individual nucleosomes in determining these compartments and their association with transcriptional activity remains unclear.

Purpose of the Study:

  • * To determine if individual nucleosomes contain intrinsic biophysical information related to A/B compartment status and gene expression.
  • * To investigate the role of nucleosome condensability in genome organization and transcriptional regulation.

Main Methods:

  • * Purification of native mononucleosomes to high monodispersity.
  • * Assessment of nucleosome condensability using biological polyamines.
  • * In silico chromatin polymer simulations.

Main Results:

  • * Nucleosome condensability is inversely correlated with A compartment localization and gene expression, particularly near promoters.
  • * In silico simulations confirm that nucleosome biophysical properties alone are sufficient for compartment formation.
  • * Condensability is an electrostatic phenomenon and its contrast is accentuated upon polyamine depletion.

Conclusions:

  • * Individual nucleosomes possess inherent biophysical properties (condensability) that dictate genome organization and gene expression.
  • * Nucleosome condensability serves as a key determinant of chromatin state and transcriptional activity.
  • * Polyamines are crucial for translating nucleosome biophysical properties into cellular function, with deficiency leading to altered condensability and potential dysfunction.