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Protocol Improvement for RNA Extraction From Compromised Frozen Specimens Generated in Austere Conditions: A Path
Nabarun Chakraborty1,2, Connie W Schmitt3, Cary L Honnold3
1Geneva Foundation, Walter Reed Army Institute of Research, Silver Spring, MD, United States.
Frontiers in Molecular Biosciences
|August 15, 2020
Summary
This study presents a method to preserve tissue quality from frozen mouse specimens, even after temperature fluctuations. This technique maximizes scientific value from samples collected in resource-limited environments, improving transcriptomic assays.
Area of Science:
- Space biology
- Molecular biology
- Histology
Background:
- High-throughput assays in phenome-to-genome studies risk false results due to sample bias.
- Minimizing sample bias by using the same tissue for phenotypic and genotypic analysis is crucial.
- Collecting samples in resource-limited environments, like the International Space Station (ISS), presents unique challenges.
Purpose of the Study:
- To develop a robust methodology for obtaining high-quality results from compromised frozen tissue specimens.
- To optimize sample preservation for both histological and molecular analyses under austere conditions.
- To enhance the scientific value derived from tissues collected in challenging environments.
Main Methods:
- Snap-frozen mouse carcasses were immersed in 10% neutral buffered formalin at 4°C for prolonged periods.
- Tissues were processed for hematoxylin and eosin (H&E) staining and slide fixation.
- A novel method using an incubator shaker was employed to recover tissue specimens from H&E slides for RNA extraction.
Main Results:
- Prolonged cold formalin fixation minimized ice crystallization artifacts in frozen tissues.
- The protocol yielded tissues with optimal histomorphology for H&E staining.
- Sufficient RNA was recovered from recovered tissue for downstream transcriptomics assays.
Conclusions:
- A cost-effective protocol was established to maximize scientific utility from frozen tissues collected in austere conditions.
- The method preserves tissue integrity for both histological and molecular analyses.
- This approach can potentially improve the spatial resolution of transcriptomic assays.
