Cited by 62Genetically Modified Organisms ResearchPharmaceutical and Antibiotic Environmental ImpactsPesticide and Herbicide Environmental Studies

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Adsorption capacity of multiple DNA sources to clay minerals and environmental soil matrices less than previously estimated

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Abstract

The cultivation and consumption of transgenic crops continues to be a widely debated topic, as the potential ecological impacts are not fully understood. In particular, because antibiotic resistance genes (ARGs) have historically been used as selectable markers in the genetic engineering of transgenic crops, it is important to determine if the genetic constructs found in decomposing transgenic crops persist long enough in the environment and if they can be transferred horizontally to indigenous microorganisms. In the present study, we address the question of persistence. Others have also estimated the DNA adsorption capacity of various clays, but have done so by manipulating the surface charge and size of particles tested which may overestimate sorption and underestimate the DNA available for horizontal transfer. In the present study, isotherms were generated using model Calf Thymus DNA and transgenic maize DNA without surface modification. Montmorillonite, kaolinite, and 3 soil mixtures with varying clay content were used in this study. The adsorption capacity of pure montmorillonite and kaolinite minerals was found to be one to two orders of magnitude less than previously estimated likely due to the distribution of clay particle sizes and heteroionic particle surface charge. However, it appears that a substantial amount of DNA is still able to adsorb onto these matrices (up to 200 mg DNA per gram of clay) suggesting the potential availability of free transgenic DNA in the e…

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Metadata

Authors
Gardner, C. M., & Gunsch, C. K.
Affiliations
Duke University (US)
Corresponding author
Gunsch, Claudia K.
Venue
Chemosphere
Publisher
Elsevier BV
Published
2017-05
Volume
175
Pages
45-51
ISSN
0045-6535 (ISSN-L)
OpenAlex
W2585070954
Cited by
62
References
0
Citations by year
2026: 5 · 2025: 7 · 2024: 6 · 2023: 7 · 2022: 9 · 2021: 9 · 2020: 5 · 2019: 7 · 2018: 5 · 2017: 2
FWCI
4.95
Type
journal article
Language
en
Open access
Locations
  • Chemosphere (acceptedVersion)
  • PubMed (publishedVersion)
Funders
National Science Foundation (CBET-1438612, GRFP DGF-106401)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Genetically Modified Organisms Research
  • Physical Sciences › Environmental Science › Pollution › Pharmaceutical and Antibiotic Environmental Impacts
  • Physical Sciences › Environmental Science › Pollution › Pesticide and Herbicide Environmental Studies
Keywords
DNA adsorption, clay minerals, montmorillonite, kaolinite, calf thymus DNA, transgene persistence, horizontal gene transfer, antibiotic resistance genes, particle surface charge
MeSH terms
Clay, Adsorption, Aluminum Silicates, Bentonite, Zea mays, DNA, Kaolin, Minerals, Soil, Soil Pollutants, Transgenes, Gene Transfer, Horizontal, Plants, Genetically Modified

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