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Postmortem delay has minimal effect on brain RNA integrity.

John F Ervin1, Erin L Heinzen, Kenneth D Cronin

  • 1Department Medicine (Neurology), Joseph and Kathleen Bryan Alzheimer's Disease Research Center, Duke University Medical Center, Durham, North Carolina 27710, USA.

Journal of Neuropathology and Experimental Neurology
|December 20, 2007
PubMed
Summary
This summary is machine-generated.

High-quality mRNA can be successfully isolated from banked human brain tissue for Alzheimer disease (AD) research. This finding supports the use of postmortem brains for gene expression studies, even many hours after death.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Alzheimer disease (AD) research increasingly focuses on gene transcript variations.
  • High-quality mRNA from banked human brains is crucial for studying gene expression in AD.
  • Understanding gene regulation's role in AD requires reliable RNA sources.

Purpose of the Study:

  • To assess the quality and suitability of postmortem human brain tissue for gene expression studies.
  • To determine if clinical variables impact mRNA integrity in banked brain samples.

Main Methods:

  • RNA was isolated from multiple brain regions (frontal, temporal, occipital cortex, cerebellum, hippocampus) of 32 Alzheimer disease (AD) cases and 36 controls.
  • Clinical variables including postmortem interval, agonal state, and cerebrospinal fluid pH were analyzed.
  • mRNA integrity was assessed across different brain regions and correlated with clinical data.

Main Results:

  • Intact mRNA was successfully isolated from most brain regions tested, across numerous postmortem hours.
  • No significant correlation was found between clinical variables (e.g., postmortem interval, pH) and mRNA integrity.
  • Banked brain tissue provides a viable source for gene expression studies in Alzheimer disease.

Conclusions:

  • Undegraded mRNA can be reliably obtained from most brain regions of banked human brains, many hours postmortem.
  • Postmortem interval and cerebrospinal fluid pH do not predict mRNA integrity in this cohort.
  • The study validates the use of postmortem brain tissue for future Alzheimer disease gene expression research.