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Related Concept Videos

Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Chromatin Packaging01:32

Chromatin Packaging

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...
Determination of Molar Masses of Polymers I01:24

Determination of Molar Masses of Polymers I

Polymerization produces macromolecules with a range of chain lengths due to the random nature of molecular growth processes. As chains form and terminate at different stages, a single polymer sample contains molecules of varying sizes rather than a uniform structure. This variability is described using average molar masses and distribution-related parameters, which together provide a comprehensive understanding of polymer characteristics.The distribution of molar masses plays a critical role in...

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Polymer Length Governs DNA Adsorption Dynamics on Mineral Surfaces.

Veer Vikram Singh1,2, Naresh Kumar3, Richard L Kimber4

  • 1Department of Environmental Geosciences, Centre for Microbiology and Environmental Systems Science, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, Austria.

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DNA polymer length significantly impacts its adsorption onto minerals. Shorter DNA fragments are preferentially adsorbed, potentially explaining their longer environmental persistence and aiding environmental DNA (eDNA) applications.

Keywords:
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Area of Science:

  • Environmental Science
  • Geochemistry
  • Molecular Biology

Background:

  • DNA adsorption to minerals is vital for its environmental fate and biogeochemical cycling.
  • Understanding DNA polymer length effects on mineral adsorption is crucial for environmental DNA (eDNA) applications and interpreting DNA persistence.
  • Current knowledge gaps exist regarding how varying DNA lengths influence adsorption and competition on diverse mineral surfaces.

Purpose of the Study:

  • To investigate the influence of DNA polymer length on adsorption behavior onto environmentally relevant minerals.
  • To examine competitive adsorption dynamics between different DNA lengths under simulated natural conditions.
  • To provide mechanistic insights into DNA preservation and fate in natural environments.

Main Methods:

  • Conducted controlled batch adsorption experiments using DNA polymers ranging from 99 bp to ~20,000 bp.
  • Utilized environmentally relevant minerals: Fe(III)-(oxyhydr)oxides (goethite, ferrihydrite), clays (kaolinite, montmorillonite), and hydroxyapatite.
  • Performed both uniform and competitive adsorption experiments, including simultaneous addition scenarios.

Main Results:

  • DNA adsorption increased with polymer length on Fe(III)-(oxyhydr)oxides and clays, but decreased on hydroxyapatite.
  • In competitive adsorption, shorter DNA polymers (99 bp) showed preferential adsorption across all tested minerals when added simultaneously.
  • The order of addition in competitive experiments influenced adsorption extent, but simultaneous addition revealed length-dependent preferential binding.

Conclusions:

  • DNA polymer length is a critical factor governing its adsorption onto mineral surfaces.
  • Preferential adsorption of shorter DNA fragments may explain their enhanced environmental persistence over long timescales.
  • Findings have implications for understanding DNA stability, mobility, and the interpretation of eDNA data in environmental studies.