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Related Experiment Video

Updated: Jun 21, 2025

Laser Capture Microdissection of Highly Pure Trabecular Meshwork from Mouse Eyes for Gene Expression Analysis
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An optimized workflow for transcriptomic analysis from archival paraformaldehyde-fixed retinal tissues collected by

Kei Takahashi1, William A Beltran1, Raghavi Sudharsan1

  • 1Division of Experimental Retinal Therapies, Department of Clinical Sciences & Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA.

Experimental Eye Research
|July 5, 2024
PubMed
Summary

This study presents an optimized method for extracting high-quality RNA from paraformaldehyde-fixed (PFA) canine retinas using laser capture microdissection (LCM). The developed protocol enables reliable transcriptomic analysis from archival ocular tissues.

Keywords:
Archival retinal tissueLaser capture microdissectionParaformaldehyde fixationRNA sequencingTranscriptomics

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Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Genomics

Background:

  • RNA sequencing (RNA-seq) with laser capture microdissection (LCM) is vital for transcriptomic analysis of fresh-frozen tissues.
  • Paraformaldehyde (PFA) fixation and Optimal Cutting Temperature (OCT) embedding, common for immunohistochemistry, often degrade RNA quality in archival ocular samples.
  • This limits the utility of preserved tissues for RNA sequencing studies.

Purpose of the Study:

  • To develop and validate a method for extracting high-quality RNA from PFA-fixed canine eyes for transcriptomic profiling.
  • To optimize LCM and RNA purification protocols for PFA-fixed retinal specimens.
  • To assess the feasibility of RNA-seq on archival PFA-fixed ocular tissues.

Main Methods:

  • Compared RNA quality from PFA-fixed/OCT-embedded canine retinas versus fresh-frozen (FF) contralateral eyes.
  • Utilized LCM to isolate retinal tissue from PFA-fixed samples.
  • Applied a two-round DNase I treatment to remove genomic DNA contamination from PFA-fixed retinal RNA.
  • Performed RNA sequencing (RNA-seq) on purified RNA from both tissue types.

Main Results:

  • An optimized LCM and RNA purification protocol successfully yielded high-quality RNA from PFA-fixed canine retinas.
  • Two rounds of DNase I treatment effectively removed genomic DNA contamination.
  • RNA sequencing data from PFA-fixed and FF retinas showed nearly identical quality and identified gene sets.
  • The developed workflow enables transcriptomic profiling from archival PFA-fixed ocular tissues.

Conclusions:

  • A refined methodology allows for high-quality RNA extraction and transcriptomic profiling from PFA-fixed archival retinal tissues.
  • This approach bridges the gap between sample preservation techniques and obtaining valuable RNA sequencing data.
  • The study enhances the potential for analyzing preserved ocular tissues in transcriptomic research.