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Effect of pre- and postmortem variables on specific mRNA levels in human brain
W J Burke1, K L O'Malley, H D Chung
1Department of Neurology, Veterans Administration Medical Center, St. Louis, MO.
Brain Research. Molecular Brain Research
|August 1, 1991
Summary
Investigating mRNA stability in autopsy brain tissue revealed that factors like hypoxia and postmortem intervals significantly impact levels of specific mRNAs, including those for PNMT, APP, and actin. These findings highlight the need to consider pre- and postmortem conditions when analyzing mRNA data.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Accurate quantification of mRNA levels in postmortem brain tissue is crucial for understanding disease mechanisms.
- Pre- and postmortem factors can potentially introduce variability and confound results in molecular studies.
- Specific mRNA transcripts may exhibit differential stability under various biological and environmental conditions.
Purpose of the Study:
- To investigate the influence of premortem and postmortem factors on the stability of specific mRNAs in human autopsy brain tissue.
- To correlate various factors with the levels of phenylethanolamine N-methyltransferase (PNMT), amyloid precursor protein (APP) splice forms, and actin mRNAs.
- To establish the necessity of accounting for pre- and postmortem variables before comparing mRNA levels across different disease states.
Main Methods:
- Polymerase chain reaction (PCR) was employed to quantify mRNA levels.
- Pearson's correlation coefficient was used to analyze relationships between factors and mRNA levels.
- Ten control human autopsy brain samples from the C1 region were analyzed.
Main Results:
- Significant negative correlations were observed between hypoxia and PNMT mRNA levels.
- Postmortem and storage intervals showed significant negative correlations with APP751 and beta-actin mRNA levels.
- A positive correlation was found between death-refrigeration interval and total APP and APP695 mRNA levels, and between seizure activity and APP770 mRNA levels.
Conclusions:
- Multiple pre- and postmortem factors demonstrably affect the stability and levels of specific mRNAs in autopsy brain tissue.
- The study underscores the importance of considering and controlling for these variables in molecular research.
- Future studies comparing mRNA levels in disease states must rigorously investigate the impact of pre- and postmortem conditions.