Molecular and cellular dynamics of the developing human neocortex at single-cell resolution.

Area of Science:

• Neuroscience
• Developmental Biology
• Genomics

Background:

• Human neocortex development involves intricate gene regulation and cellular differentiation.
• Understanding these processes is key to deciphering neural development and associated disorders.

Purpose of the Study:

• To create a comprehensive atlas of gene regulatory networks in the developing human neocortex.
• To identify progenitor subtypes and their lineage relationships during neurogenesis and gliogenesis.
• To investigate the link between developmental processes and neurological diseases like glioblastoma and autism spectrum disorder (ASD).

Main Methods:

• Paired single-nucleus chromatin accessibility and transcriptome sequencing from 38 human neocortical samples (first trimester to adolescence).
• Spatial transcriptomic analysis for cellular organization and communication.
• Progenitor purification and lineage-tracing experiments.
• Integration with Genome-Wide Association Studies (GWAS) data.

Main Results:

• Cataloged cell type-, age-, and area-specific gene regulatory networks.
• Identified a tripotential intermediate progenitor (Tri-IPC) responsible for producing GABAergic neurons, oligodendrocyte precursor cells, and astrocytes.
• Found that glioblastoma cells transcriptomically resemble Tri-IPCs.
• Generated a disease-risk map linking second-trimester intratelencephalic projection neurons to enriched ASD risk.

Conclusions:

• The developed atlas provides insights into the gene regulatory landscape and cellular dynamics of the human neocortex.
• The identification of Tri-IPC sheds light on progenitor plasticity and its potential role in cancer.
• The study highlights the connection between developmental trajectories and neurodevelopmental and neurological disorders.