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DNA amplification from osmicated, plastic-embedded eye tissues.

Jessica K Niggel1,2, Gustavo D Aguirre1,2, Leonardo Murgiano1,2

  • 1Department of Clinical Sciences & Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA.

Molecular Vision
|March 23, 2026
PubMed
Summary

Genomic DNA can be successfully extracted from old, epoxy-embedded mammalian eye tissues for genetic mutation studies. This method enables retrospective genetic analysis of archival samples, aiding in inherited eye disease research.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Archival mammalian tissues embedded in epoxy resins (e.g., Epon, Poly/Bed) were common for electron microscopy.
  • Utilizing these historical specimens for modern genetic studies, such as mutation characterization, presents significant challenges.
  • The integrity of genomic DNA within these preserved tissues is often questionable for advanced molecular analyses.

Purpose of the Study:

  • To determine if genomic DNA can be extracted from osmicated, archival epoxy-embedded mammalian eye tissues.
  • To assess if the extracted DNA is of sufficient quality for short-amplicon polymerase chain reaction (PCR) amplification.
  • To establish a method for leveraging historical tissue samples for genetic research.

Main Methods:

  • Nine archival epoxy-embedded mammalian eye tissue blocks (Epon, Araldite, Poly/Bed) from the 1970s-1990s were selected.
  • Tissues underwent resin removal, digestion, and DNA extraction using Proteinase K and Trizol.
  • Purified DNA was quantified and subjected to PCR amplification targeting genes associated with inherited eye conditions.

Main Results:

  • Genomic DNA was successfully extracted from most of the archival epoxy-embedded eye samples.
  • Targeted PCR amplification yielded amplicons (90-260 bp) for genes including PRCD, RHO, GUSB1, and REEP1.
  • Sanger sequencing confirmed the identity of the amplified gene products, validating DNA quality.

Conclusions:

  • A reliable method for extracting DNA from osmicated, epoxy-embedded mammalian eye tissues has been established.
  • This technique provides a valuable resource for investigating the genetic basis of inherited eye diseases.
  • The findings allow for retroactive confirmation of molecular diagnoses based on prior microscopic analyses of archival specimens.