Spatial transcriptomic survey of human embryonic cerebral cortex by single-cell RNA-seq analysis

Area of Science:

• Neuroscience
• Developmental Biology
• Genomics

Background:

• Human brain development is complex, but regional cerebral cortex characterization via single-cell transcriptomics is lacking.
• Understanding early cellular and molecular events is crucial for deciphering brain development.

Purpose of the Study:

• To provide a comprehensive regional characterization of the human cerebral cortex using single-cell transcriptome analysis.
• To identify cell sub-clusters, regional gene expression patterns, and neuron maturation dynamics during embryonic development.

Main Methods:

• RNA sequencing (RNA-seq) was performed on over 4,000 individual cells.
• Cells were sourced from 22 distinct brain regions of human mid-gestation embryos.
• Bioinformatic analysis identified 29 cell sub-clusters and regional gene expression profiles.

Main Results:

• Identified 29 distinct cell sub-clusters with varying proportions across 22 brain regions.
• Observed asynchronous neuron maturation, with dorsal regions appearing more mature than ventral regions.
• Discovered region-specific genes in neuronal sub-clusters, many linked to neural diseases.

Conclusions:

• Presents a systematic landscape of regional gene expression and neuron maturation in the developing human cerebral cortex.
• Highlights the importance of regionalization and asynchronous development in early human brain formation.
• Identified numerous neural disease-related genes, offering insights into developmental neuropathologies.