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Experimental Approaches for Biochemical Analysis of Glial Fibrillary Acidic Protein and Its Disease-associated Variants
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Experimental Approaches for Biochemical Analysis of Glial Fibrillary Acidic Protein and Its Disease-associated Variants

Published on: November 28, 2025

Alternative mRNA splicing from the glial fibrillary acidic protein (GFAP) gene generates isoforms with distinct

Rune Thomsen1, Tina F Daugaard, Ida E Holm

  • 1Department of Biomedicine, Aarhus University, Aarhus, Denmark.

Plos One
|August 31, 2013
PubMed

Insights

Alternative splicing of Glial fibrillary acidic protein (Gfap) mRNA generates distinct isoforms, Gfapα and Gfapδ. These isoforms exhibit unique mRNA localization patterns in astrocytes, influencing intermediate filament dynamics during brain development and disease.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Astrocytes utilize intermediate filaments, primarily composed of Glial fibrillary acidic protein (Gfap), for structural integrity.
  • Alternative splicing of Gfap mRNA produces various protein isoforms, with Gfapα being the most abundant.
  • The Gfapδ isoform is specifically found in developing and adult human and mouse brain astrocytes.

Purpose of the Study:

  • To characterize mouse Gfapδ mRNA and Gfapδ protein.
  • To investigate the expression patterns and subcellular localization of Gfapδ in the developing mouse brain.
  • To explore the impact of alternative splicing on Gfap mRNA localization and its potential role in astrocyte function.

Main Methods:

  • Quantitative real-time PCR (RT-qPCR) to analyze Gfapδ and Gfapα mRNA expression levels.
  • Immunohistochemistry to determine Gfapδ protein localization in developing mouse brain.
  • Immunofluorescence microscopy to assess subcellular localization and co-localization with Gfapα.
  • Subcellular mRNA localization studies in primary mouse astrocytes.

Main Results:

  • Gfapδ and Gfapα mRNA expression levels increase coordinately during the postnatal period.
  • Gfapδ protein is localized in sub-ventricular zones of the developing mouse brain, consistent with human studies.
  • Gffapδ integrates into the intermediate filament network, showing overlapping subcellular localization with Gfapα.
  • Gfapα mRNA predominantly localizes to astrocyte protrusions, while Gfapδ mRNA shows differential localization, influenced by distinct 3'-exon sequences.

Conclusions:

  • Alternative Gfap mRNA splicing generates isoforms with distinct mRNA localization patterns.
  • Differential mRNA localization leads to varied local mRNA concentrations, potentially regulating subcellular intermediate filament dynamics.
  • These findings offer insights into the role of Gfap isoform-specific localization in brain development, maintenance, and disease processes.

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