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Spatial Single-cell Analysis Decodes Cortical Layer and Area Specification.

Xuyu Qian1,2,3, Kyle Coleman4,3, Shunzhou Jiang4,3

  • 1Division of Genetics and Genomics, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.

Biorxiv : the Preprint Server for Biology
|June 25, 2024
PubMed
Summary
This summary is machine-generated.

This study maps human fetal brain development using spatial single-cell analysis, revealing early layer formation and a sharp molecular border in visual cortex. This challenges gradient models and highlights spatial context in brain development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genomics

Background:

  • The human cerebral cortex, crucial for cognition, has six layers and specialized areas, defined by molecular and structural organization.
  • Existing single-cell transcriptomics lose spatial context, limiting understanding of human cortical development.
  • Spatial relationships are vital for molecular specification of cortical layers and areas.

Purpose of the Study:

  • To examine the molecular, cellular, and cytoarchitectural development of the human fetal cortex with spatially resolved single-cell resolution.
  • To create an extensive spatial atlas of human cortical development across multiple areas and time points.
  • To investigate the molecular mechanisms underlying cortical arealization and layer formation.

Main Methods:

  • Utilized multiplexed error-robust fluorescence in situ hybridization (MERFISH) for spatial transcriptomics.
  • Employed deep-learning-based cell segmentation for enhanced analysis.
  • Integrated MERFISH with single-nuclei RNA-sequencing and in situ whole transcriptomics.

Main Results:

  • Established a spatial atlas of 16 million single cells across eight cortical areas and four gestational time points (second and third trimesters).
  • Observed early establishment of the six-layer structure by mid-gestation, preceding cytoarchitectural layer emergence.
  • Discovered a sharp molecular border between primary (V1) and secondary (V2) visual cortices at gestational week 20, characterized by an abrupt binary shift in neuronal subtype specification, challenging continuous gradient models.
  • Identified early upregulation of synaptogenesis in V1-specific Layer 4 neurons, suggesting its role in discrete border formation.

Conclusions:

  • Spatial relationships are crucial for the molecular specification of cortical layers and areas.
  • The findings challenge the notion that continuous morphogen gradients solely dictate mid-gestation cortical arealization.
  • This work provides a valuable resource and establishes a spatial single-cell analysis paradigm for future human brain development atlases.