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Related Experiment Videos

Nuclear gene sequences from a late pleistocene sloth coprolite.

Hendrik Poinar1, Melanie Kuch, Gregory McDonald

  • 1Max-Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany. poinar@eva.mpg.de

Current Biology : CB
|July 5, 2003
PubMed
Summary

Ancient nuclear DNA (nDNA) can be recovered from fossils found in warm, arid environments, not just cold climates. This breakthrough allows for broader applications in evolutionary studies and paleontology.

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Area of Science:

  • Paleogenomics
  • Molecular Phylogenetics
  • Ancient DNA studies

Background:

  • Determination of nuclear DNA (nDNA) sequences from ancient remains offers significant opportunities for resolving phylogenies, sexing remains, and characterizing phenotypic traits.
  • Previously, single-copy nDNA sequences were only obtainable from frozen mammoth remains, leading to the assumption that nDNA retrieval is restricted to cold environments.
  • Mitochondrial DNA (mtDNA) and chloroplast DNA (cpDNA) have been recovered from Pleistocene sloth coprolites, but using only mtDNA for sloth phylogeny has yielded inconclusive results.

Purpose of the Study:

  • To investigate the feasibility of recovering ancient single-copy nuclear DNA from non-frozen, arid environments.
  • To resolve the phylogeny of extinct sloth families using ancient nuclear DNA sequences.
  • To demonstrate that nuclear DNA preservation is not limited to cold climates.

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Main Methods:

  • DNA extraction from a ground sloth coprolite from Gypsum Cave, Nevada.
  • Quantification of mitochondrial DNA (mtDNA) copy numbers using real-time PCR.
  • Amplification of one multicopy and three single-copy nuclear gene fragments.
  • Phylogenetic analysis using concatenated nuclear DNA sequences.

Main Results:

  • Ancient single-copy nuclear DNA sequences were successfully recovered from a sloth coprolite found in a warm, arid climate.
  • Phylogenetic analysis using the concatenated nuclear DNA sequence provided resolution for extinct sloth families.
  • The findings demonstrate that nuclear DNA preservation is achievable outside of permafrost conditions.

Conclusions:

  • Ancient nuclear DNA can be retrieved from fossils in warm, arid environments, expanding the scope of paleogenomic research.
  • This study overcomes the limitation of relying solely on frozen remains for ancient nDNA analysis.
  • The successful recovery and analysis of ancient nDNA from sloth coprolites open new avenues for understanding evolutionary history in diverse climatic settings.