Extracellular DNA Plays a Key Role in Deep-Sea Ecosystem Functioning

  title={Extracellular DNA Plays a Key Role in Deep-Sea Ecosystem Functioning},
  author={Antonio Dell'Anno and Roberto Danovaro},
  pages={2179 - 2179}
The ecological role and biogeochemical relevance of extracellular DNA in the oceanic sediments are unknown. Our global estimates indicate that up to 0.45 gigatons of extracellular DNA are present in the top 10 centimeters of deep-sea sediments, representing the largest reservoir of DNA in the world oceans. We demonstrate that extracellular DNA accounts for about one fifth of the total organic phosphorus regeneration and provides almost half of the prokaryotic demand for organic phosphorus. It… 

Extracellular DNA as a genetic recorder of microbial diversity in benthic deep-sea ecosystems

The findings expand the knowledge of the contribution of extracellular microbial sequences to current estimates of prokaryotic diversity obtained through the analyses of “environmental DNA”, and open new perspectives for understanding microbial successions in benthic ecosystems.

Early diagenesis and trophic role of extracellular DNA in different benthic ecosystems

The data suggest that bioavailable extracellular DNA might represent an important nutrient source for benthic heterotrophic metabolism and open new perspectives for a better understanding of the factors that influence the functioning of benthics systems.

Major viral impact on the functioning of benthic deep-sea ecosystems

It is reported that viral production in deep-sea benthic ecosystems worldwide is extremely high, and that viral infections are responsible for the abatement of 80% of prokaryotic heterotrophic production.

Damage and degradation rates of extracellular DNA in marine sediments: implications for the preservation of gene sequences

It is suggested that the extracellular DNA pool in marine sediments represents a repository of genetic information, which can be used for improving the understanding of the biodiversity, functioning and evolution of ecosystems over different timescales.

Prokaryotic lifestyles in deep sea habitats

The current state-of-the-art of deep-sea microbial genomics is reviewed to allow for a better understanding ofDeep-sea evolution, physiology, biochemistry, community structure and nutrient cycling.

Virus decomposition provides an important contribution to benthic deep-sea ecosystem functioning

It is shown that, given the huge viral biomass of the ocean seafloor and the high rates of this process, virus decomposition provides a major source of labile organic compounds able to sustain the microbial food webs and nutrient cycling at a global scale.

Preservation and Significance of Extracellular DNA in Ferruginous Sediments from Lake Towuti, Indonesia

It is concluded that extracellular DNA preserved in shallow lacustrine sediments reflects the initial environmental context, but is gradually modified and thereby shifts from its stratigraphic context.

DNA-foraging bacteria in the seafloor

Comparative genomics indicated that DNA can be digested by diverse members of the order Candidatus Izemoplasmatales (former Tenericutes), which appear to be specialised DNA-degraders that encode multiple extracellular nucleases.

Extracellular DNA can preserve the genetic signatures of present and past viral infection events in deep hypersaline anoxic basins

It is found that DHAB sediments are hot-spots of viral infections, which largely contribute to the release of high amounts of extracellular DNA, suggesting that extrace cellular DNA released from killed prokaryotes can be the most suitable trophic resource for benthic proKaryotes.

Dark inorganic carbon fixation sustains the functioning of benthic deep‐sea ecosystems

Overall, the data suggest that archaeal assemblages of surface deep-sea sediments are responsible for the high rates of inorganic carbon incorporation and thereby sustain the functioning of the food webs as well as influence the carbon cycling of benthicdeep-sea ecosystems.



Quantification, base composition, and fate of extracellular DNA in marine sediments

It is calculated that more than 50% of extracellular DNA was recalcitrant to enzymatic degradation, which might explain why DNA accumulates in surface sediments and suggests that DNA might play a nonnegligible role in P biogeochemical cycle.

Marine phosphorus is selectively remineralized

Phosphorus is a vital nutrient of the world's oceans,, where in vast regions it is associated with dissolved organic matter (DOM) in surface waters,. We have characterized the major compound classes

Bacteria in the cold deep-sea benthic boundary layer and sediment-water interface of the NE Atlantic.

  • Turley
  • Environmental Science
    FEMS microbiology ecology
  • 2000
This is a short review of the current understanding of the role of microorganisms in the biogeochemistry in the deep-sea benthic boundary layer (BBL) and sediment-water interface (SWI) of the NE

Phosphorus accumulation in marine sediments and the oceanic phosphorus cycle

Ideas about key factors in the oceanic mass balance of dissolved, reactive phosphate have changed substantially. I present an integrated overview of these here, with an emphasis on evaluating the

Phosphate depletion in the western North Atlantic Ocean.

It is hypothesized that nitrogen versus phosphorus limitation of primary production in the present-day ocean may be closely linked to iron supply through control of dinitrogen (N2) fixation, an iron-intensive metabolic process.

Prokaryotes: the unseen majority.

The number of prokaryotes and the total amount of their cellular carbon on earth are estimated to be 4-6 x 10(30) cells and 350-550 Pg of C (1 Pg = 10(15) g), respectively, which is 60-100% of the estimated total carbon in plants.