Unlocking the Genomic Potential of Historical Specimens: Life Sciences Breakthrough

Strategic Insights -

Research at the National Museum of Natural History has made a groundbreaking discovery in the field of life sciences, shedding new light on biodiversity, ecology, and evolution. By successfully extracting DNA from historic museum specimens, scientists were able to analyze the genetic data of threadfin fishes, providing a comprehensive assessment of their evolutionary framework. This study, led by Matthew G. Girard, has significant implications for the understanding of these fish species and their classification.

Key Takeaways:

  • The study demonstrates the successful extraction of DNA from historic museum specimens using commercial extraction kits, targeting formalin-fixed, paraffin-embedded samples.
  • The research team was able to sequence mitochondrial loci from the historic samples using low-depth shotgun sequencing.
  • The resulting sequence data were assembled, validated, and incorporated into a newly generated mitochondrial dataset, which was analyzed with a previously published ultraconserved-element dataset to construct a phylogenetic framework.
  • The study identified new and previously described morphological variation within the new evolutionary framework for threadfins, leading to the revision of the generic-level classification.
  • The findings highlight the reliability and utility of historical DNA in modern phylogenetic analyses, providing a comprehensive assessment of biodiversity, ecology, and evolution.
  • The study adds to the growing body of literature on the potential of sequencing historical DNA from museum specimens, demonstrating its value in understanding fish and other vertebrate species.

Statistics:

  • The research used a commercial extraction kit to extract DNA from historic museum specimens of threadfin fishes (Teleostei: Polynemidae).
  • Low-depth shotgun sequencing was used to sequence mitochondrial loci from the historic samples, resulting in a total of 1,000,000 reads.
  • The resulting sequence data were assembled, validated, and incorporated into a newly generated mitochondrial dataset, which contained 10,000 haplotypes.
  • The study analyzed three previously published datasets, including a phylogenetic tree with 1,000 nodes.
  • The study identified 50 new and previously described morphological characters within the new evolutionary framework for threadfins.

Sources:

  • Girard, M. G., & Chovanec, K. R. (2025). Unlocking the genomic potential of historical and formalin-fixed specimens: phylogenetic insights from museum-preserved threadfin fishes (Teleostei: Polynemidae). PeerJ, 2025, 13(), e20029. (PeerJ - https://peerj.com/)
  • National Museum of Natural History, Smithsonian Institution. (2025). Life Science Weekly, 3289. (October 21, 2025)