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In situ hybridization demonstrates the stability of mRNA in post-mortem rat tissues
1University Department of Pathology, Royal Infirmary, Glasgow, U.K.
Abstract:
In situ hybridization was used to detect messenger RNA (mRNA) in a variety of rat tissues which were fixed in formalin either immediately after death or after a 24 h period of storage at 5 degrees C. A synthetic polydeoxythymidine [poly d(T)] oligonucleotide probe was used to demonstrate polyadenylated [poly (A)] mRNA in the small intestine, pancreas, liver, cerebellum, and pituitary. Of these tissues, only the liver showed a small reproducible reduction in hybridization signal following delayed fixation. Synthetic oligonucleotide probes complementary to albumin and pro-opiomelanocortin (POMC) mRNAs were hybridized to liver and pituitary, respectively. There was no significant reduction in hybridization signal in post-mortem tissues. The results suggest that some mRNAs may be remarkably stable under certain post-mortem conditions and this should encourage the wider application of in situ hybridization techniques to post-mortem material.
Insights
Messenger RNA (mRNA) is stable in rat tissues for up to 24 hours post-mortem, suggesting in situ hybridization is viable for post-mortem studies.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- In situ hybridization (ISH) is a powerful technique for detecting nucleic acids within cells and tissues.
- Assessing the stability of messenger RNA (mRNA) in post-mortem tissues is crucial for the reliable application of ISH in forensic and research settings.
Purpose of the Study:
- To investigate the stability of polyadenylated (poly(A)) mRNA and specific mRNAs in various rat tissues after a 24-hour post-mortem delay.
- To evaluate the impact of delayed formalin fixation on the integrity of mRNA for ISH.
Main Methods:
- In situ hybridization was performed on rat tissues fixed immediately or after 24 hours at 5°C.
- Synthetic oligonucleotide probes targeting poly(A) mRNA, albumin mRNA, and pro-opiomelanocortin (POMC) mRNA were utilized.
- Hybridization signals were quantified to assess mRNA stability.
Main Results:
- Poly(A) mRNA was detected in the small intestine, pancreas, liver, cerebellum, and pituitary.
- A minor reduction in hybridization signal was observed in the liver following delayed fixation.
- No significant reduction in hybridization signal was found for albumin or POMC mRNA in post-mortem liver and pituitary tissues, respectively.
Conclusions:
- Certain messenger RNAs exhibit remarkable stability in rat tissues under post-mortem conditions for up to 24 hours.
- These findings support the broader application of in situ hybridization techniques to post-mortem biological samples.
- The stability of mRNA suggests that ISH can yield reliable results even with delayed tissue fixation.