Related Experiment Video
Updated: Jun 6, 2026
Analysis of Translation in the Developing Mouse Brain using Polysome Profiling
Published on: May 22, 2021
Polysome Profiling Method for Low-Input Human Postmortem Brain
Vandana Sharma1,2, Anuj Choudhary2, Mrunali Dinesh Dhokne2
1Department of Zoology and Physiology, University of Wyoming, Laramie, WY, 82071, USA.
Abstract:
Polysome profiling is a powerful technique used to analyze the association of mRNA with ribosomes, providing insights into the translational status of a cell. It relies on the separation of ribosome-bound mRNAs through sucrose density gradient centrifugation, where the number of ribosomes on an mRNA correlates with its sedimentation rate. While numerous studies have successfully applied this method to cell line and mouse tissue, application to the human postmortem brain remains scarce due to challenges related to sample quality and low concentration of recoverable material. To overcome these challenges, we: 1. Implemented a protocol specifically optimized for low-concentration human post-mortem brain tissue. 2. Implemented a gradient-maker-free method to manually prepare sucrose gradients with tunable sensitivity for low-input samples. 3. Adapted the human brain tissue protocol for neuronal cell lines and mouse brain with minimal modification.
Insights
Polysome profiling was adapted for low-input human postmortem brain tissue, overcoming sample quality challenges. This optimized method enables deeper insights into brain translation and disease mechanisms.
Area of Science:
- Molecular Biology
- Neuroscience
- Genomics
Background:
- Polysome profiling analyzes mRNA-ribosome complexes to assess cellular translation dynamics.
- Sucrose density gradient centrifugation separates ribosome-bound mRNAs based on sedimentation rate.
- Existing methods are challenging for low-quality, low-input human postmortem brain samples.
Purpose of the Study:
- To develop and optimize a polysome profiling protocol for scarce human postmortem brain tissue.
- To enable the study of translational regulation in the human brain, particularly in postmortem conditions.
Main Methods:
- Implementation of a gradient-maker-free manual sucrose gradient preparation method.
- Adaptation of the protocol for low-concentration, low-input human postmortem brain samples.
- Validation of the protocol on neuronal cell lines and mouse brain tissue.
Main Results:
- Successfully optimized polysome profiling for low-input human postmortem brain tissue.
- Demonstrated the adaptability of the protocol for neuronal cell lines and mouse brain.
- Enabled tunable sensitivity for low-input samples using manual gradient preparation.
Conclusions:
- The developed polysome profiling protocol overcomes key limitations for human postmortem brain analysis.
- This advancement facilitates research into translational control in neurological disorders.
- The protocol's adaptability broadens its utility across various biological samples.
