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Single-cell proteomic landscape of the developing human brain.

Tianzhi Wu1, Lihua Jiang2, Tanzila Mukhtar1

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Researchers developed a new method to analyze single-cell protein levels in the developing human brain. This proteomic analysis reveals significant differences between gene and protein expression, especially in neurodevelopmental disorders.

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Area of Science:

  • Neuroscience
  • Proteomics
  • Genomics

Background:

  • Single-cell protein analysis in human tissues is difficult.
  • Transcriptome and proteome levels often do not align in the human cerebral cortex.

Purpose of the Study:

  • To develop and optimize a workflow for quantitative single-cell proteomics in the developing human brain.
  • To achieve deep proteomic coverage in individual cells, including small prenatal neurons.

Main Methods:

  • Combined label-free single-cell mass spectrometry with precise sample preparation.
  • Analyzed proteomes of individual cells from the developing human brain.

Main Results:

  • Achieved deep proteomic coverage (~800 proteins per cell) in small prenatal neurons.
  • Documented extensive transcriptome-proteome discordance across cell types, particularly for neurodevelopmental disorder genes.
  • Demonstrated higher cell-type specificity for proteins compared to their mRNA.
  • Reconstructed developmental trajectories at the proteomic level, identifying dynamic protein co-expression modules.

Conclusions:

  • Proteomic analysis is crucial for understanding cell-type specificity and developmental dynamics.
  • Identified the intermediate progenitor-to-neuron transition as a vulnerable phase for autism spectrum disorder.