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Updated: Nov 9, 2025

Obtaining High Quality RNA from Single Cell Populations in Human Postmortem Brain Tissue

Obtaining High Quality RNA from Single Cell Populations in Human Postmortem Brain Tissue

Published on: August 6, 2009

Agonal Factors Distort Gene-Expression Patterns in Human Postmortem Brains.

Jiacheng Dai^1,2, Yu Chen¹, Rujia Dai³

¹Center for Medical Genetics, Department of Psychiatry, School of Life Sciences, National Clinical Research Center on Mental Disorders, The Second Xiangya Hospital, Central South University, Changsha, China.

Frontiers in Neuroscience

|April 12, 2021

Summary

This summary is machine-generated.

Agonal factors like fever and infection significantly alter postmortem brain gene expression. Accounting for these pre-death conditions is crucial for accurate molecular analysis of brain tissue.

Keywords:

agonal factors brain cell types gene co-expression gene expression post-mortem brain studies

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Area of Science:

Neuroscience
Molecular Biology
Genomics

Background:

Postmortem brain studies are vital for understanding neurological diseases.
Gene expression analysis is a key tool in these studies.
Agonal factors, conditions before death, can potentially confound results.

Purpose of the Study:

To investigate the impact of agonal factors on postmortem brain gene expression.
To identify specific agonal conditions that influence molecular profiles.
To emphasize the need for correcting agonal factors in data preprocessing.

Main Methods:

Utilized gene expression data from 262 ROSMAP study samples.
Detailed terminal state information (e.g., fever, infection) was recorded for each donor.
Statistical analyses were performed to correlate agonal factors with gene expression changes.

Main Results:

Fever and infection were identified as primary contributors to gene expression changes.
Agonal factors influenced brain cell-type-specific gene expression and cell proportions.
Previous postmortem brain gene expression studies may have been confounded by these factors.

Conclusions:

Agonal factors, particularly fever and infection, significantly impact postmortem brain molecular quality.
Correction for agonal factors is essential during data preprocessing for accurate gene expression analysis.
Future study designs should meticulously document and account for agonal conditions.