Biodiversity (Communications arising): suspect evidence of transgenic contamination

Nature. 2002 Apr 11;416(6881):600-1; discussion 600, 602. doi: 10.1038/nature738. Epub 2002 Apr 4.


Quist and Chapela claim that transgenic DNA constructs have been introgressed into a traditional maize variety in Mexico, and furthermore suggest that these constructs have been reassorted and introduced into different genomic backgrounds. However, we show here that their evidence for such introgression is based on the artefactual results of a flawed assay; in addition, the authors misinterpret a key reference to explain their results, concluding that reassortment of integrated transgenic DNA occurs during transformation or recombination.

MeSH terms

  • Artifacts
  • DNA Primers / genetics
  • Gene Transfer, Horizontal / genetics
  • Genome, Plant*
  • Hybridization, Genetic / genetics
  • Mexico
  • Nucleic Acid Hybridization
  • Plants, Genetically Modified
  • Polymerase Chain Reaction / methods
  • Polymerase Chain Reaction / standards*
  • Polymorphism, Genetic / genetics
  • Recombination, Genetic / genetics*
  • Reproducibility of Results
  • Transformation, Genetic
  • Transgenes / genetics*
  • Zea mays / genetics*


  • DNA Primers