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Top-Down Proteomics Enables Comparative Analysis of Brain Proteoforms Between Mouse Strains.

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This study used top-down proteomics to analyze mouse brain proteoforms across four inbred strains, revealing strain-specific differences in protein expression and modifications like ARPP-21 phosphorylation. These findings advance our understanding of neurobiology and genetic influences on brain function.

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Area of Science:

  • Neuroscience
  • Proteomics
  • Genomics

Background:

  • Mass spectrometry-based proteomics has advanced the study of the brain proteome, including protein expression and modifications.
  • Top-down mass spectrometry now enables high-throughput identification and quantification of intact proteoforms.
  • Murine models, particularly inbred strains, are crucial for understanding genotype-phenotype relationships in brain development and disease.

Purpose of the Study:

  • To apply label-free quantitative top-down proteomics for the first time to analyze the mouse brain proteome.
  • To identify physiochemical differences in the intact proteome of four healthy inbred mouse strains (C57BL/6J, DBA/2J, FVB/NJ, BALB/cByJ).
  • To catalog findings in a new Mouse Brain Proteoform Atlas and disseminate them using the TDViewer tool.

Main Methods:

  • Utilized label-free quantitative top-down mass spectrometry.
  • Analyzed intact proteoforms within the 3.5-30 kDa mass range.
  • Performed Gene Ontology (GO) analysis on differentially expressed proteoforms.

Main Results:

  • Identified 131 gene products and fully characterized 343 out of 593 detected proteoforms.
  • Discovered differential expression of phosphorylated ARPP-21 proteoforms (inhibitors of calmodulin) across the four inbred strains.
  • GO analysis highlighted similarities and differences in strain phenotypes based on proteoform expression.

Conclusions:

  • This study presents the first label-free quantitative top-down proteomic analysis of the mouse brain.
  • The findings reveal strain-specific proteomic variations, offering insights into the genetic basis of neurobiological differences.
  • The Mouse Brain Proteoform Atlas and TDViewer tool provide valuable resources for future neuroscience research.