Protocol for the purification and transcriptomic analysis of mouse astrocytes using GFAT.

Area of Science:

• Neuroscience
• Molecular Biology
• Genomics

Background:

• Astrocytes, crucial glial cells in the central nervous system, regulate neuronal activity.
• Understanding astrocyte function requires detailed molecular analysis, but isolating pure astrocyte populations can be challenging.

Purpose of the Study:

• To present a novel protocol, glyoxal-fixed astrocyte nuclei transcriptomics (GFAT), for the purification and transcriptomic analysis of astrocyte nuclei.
• To enable parallel profiling of astrocytes and neurons from mouse brain tissue without genetic modification.

Main Methods:

• The GFAT protocol involves tissue dissection, glyoxal fixation, homogenization, and nuclei isolation from mouse brain.
• Purification is achieved through antibody staining and fluorescence-activated cell sorting (FACS).
• Downstream analysis includes RT-qPCR or bulk RNA sequencing for transcriptomic profiling.

Main Results:

• The GFAT protocol successfully isolates and purifies astrocyte nuclei from adult and aged mouse cortex and cerebellum.
• The method is effective without the need for transgenic animal lines or viral injections.
• Parallel profiling of both astrocyte and neuron nuclei is feasible using this approach.

Conclusions:

• Glyoxal-fixed astrocyte nuclei transcriptomics (GFAT) provides a robust and versatile method for studying astrocyte biology at the transcriptomic level.
• This protocol facilitates research into astrocyte function and dysfunction in various physiological and pathological conditions.
• GFAT offers a valuable tool for comparative transcriptomic analyses between astrocytes and neurons.