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Related Concept Videos

Nucleoid01:24

Nucleoid

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The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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Genomic DNA in Prokaryotes00:46

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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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DNA Packaging00:58

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Overview
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The Nucleus01:32

The Nucleus

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
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Chromatin Packaging01:32

Chromatin Packaging

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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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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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[DNA everywhere].

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  • 1Biologiste, généticien et immunologiste, Président d'Aprogène (Association pour la promotion de la Génomique), 13007 Marseille, France.

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Deep sequencing of environmental DNA (eDNA) detects human DNA in samples from human activities. This well-preserved DNA offers opportunities for genetic surveys but also poses privacy concerns.

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Area of Science:

  • Environmental DNA (eDNA) analysis
  • Genomics
  • Molecular ecology

Context:

  • Deep sequencing technologies enable sensitive detection of DNA in environmental samples.
  • Environmental DNA is increasingly used for biodiversity monitoring.
  • Human activities leave detectable traces in the environment.

Purpose:

  • To investigate the presence and usability of human DNA found in environmental samples.
  • To assess the potential of human eDNA for population and individual genetic studies.
  • To explore the implications of human eDNA detection for privacy.

Summary:

  • Advanced analysis of environmental DNA using deep sequencing identified human DNA in numerous samples linked to human activity.
  • The detected human DNA is in good condition, suitable for genetic surveys of populations and individuals.
  • This finding presents significant scientific opportunities alongside notable privacy issues.

Impact:

  • Highlights the potential for human eDNA as a novel data source in genetic research and forensics.
  • Raises critical ethical considerations regarding privacy and the use of environmental genetic data.
  • Advances the application of eDNA techniques beyond traditional biodiversity assessments.