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Related Concept Videos

Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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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Genome Annotation and Assembly

The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
Genomics02:02

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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
The Nucleosome01:19

The Nucleosome

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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The Nucleosome02:33

The Nucleosome

DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to 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.
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...
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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to 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.
DNA is wound twice around a protein complex called histone core, that consist of 8 histone proteins. This complex...

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Compositional Structure of the Genome: A Review.

Pedro Bernaola-Galván1, Pedro Carpena1, Cristina Gómez-Martín2,3

  • 1Department of Applied Physics II and Institute Carlos I for Theoretical and Computational Physics, University of Málaga, 29071 Málaga, Spain.

Biology
|June 28, 2023
PubMed
Summary
This summary is machine-generated.

Analyzing genome structure using statistical physics reveals hierarchical patterns. This research provides insights into genome evolution and compositional complexity, particularly in Cyanobacteria.

Keywords:
DNA compositional structureevolutionary adaptive trendshierarchical genome structuresegment compositional signaturesequence compositional complexity

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Area of Science:

  • Genomics
  • Statistical Physics
  • Bioinformatics

Background:

  • The genome encodes a species' evolutionary history through interactions.
  • DNA sequences exhibit compositional variations across different length scales, forming a hierarchical structure.
  • Understanding these variations is crucial for deciphering genome evolution.

Purpose of the Study:

  • To analyze genome structure and evolution using statistical physics methods.
  • To classify and quantify compositional heterogeneities within genomes.
  • To investigate evolutionary trends in genome complexity.

Main Methods:

  • Application of statistical physics techniques, including entropic segmentation and fluctuation analysis.
  • Classification of compositional structures into short-range heterogeneities, isochores, and superstructures.
  • Utilizing sequence compositional complexity (SCC) for genome comparisons and phylogenetic regression.

Main Results:

  • Identified a hierarchical compositional structure in genomes, with distinct categories of heterogeneities.
  • Shared isochore and superstructure coordinates for the first complete T2T human sequence in a public database.
  • Revealed positive trends towards increased genome complexity in Cyanobacteria over evolutionary time.

Conclusions:

  • Genome structure exhibits a prevalent hierarchical compositional organization.
  • Statistical physics methods offer powerful tools for genome analysis and evolutionary studies.
  • Evidence suggests a driven, progressive evolution of genome compositional structure, particularly in ancient lineages like Cyanobacteria.