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Disentangling transcriptomic heterogeneity within the human subgenual anterior cingulate cortex.

Aaron K Jenkins1, Micah A Shelton1, RuoFei Yin2

  • 1Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, 450 Technology Drive, Suite 223, Pittsburgh, PA 15219, United States.

Cerebral Cortex (New York, N.Y. : 1991)
|July 25, 2024
PubMed
Summary
This summary is machine-generated.

Researchers explored gene expression in the human subgenual anterior cingulate cortex (sgACC). They found distinct transcriptional profiles between cortical layers 3 and 5, suggesting functional differences within this emotion-processing brain region.

Keywords:
RNA-sequencingdifferential expressionfunctional neuroanatomylaser capture microdissectionpostmortem

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genomics

Background:

  • The subgenual anterior cingulate cortex (sgACC) is crucial for processing emotion and affect.
  • The sgACC comprises multiple Brodmann Areas (BAs) with varying cytoarchitectures.
  • Layer 5 in some sgACC BAs is further divided into sublayers (L5a and L5b), impacting projection targets.

Purpose of the Study:

  • To investigate transcriptional differences across Brodmann Areas (BAs), layers, and sublayers of the human sgACC.
  • To understand the molecular basis of potential functional heterogeneity within the sgACC.
  • To identify normative transcriptional features of the sgACC.

Main Methods:

  • Laser capture microdissection was used to collect specific cortical layer strips from the human sgACC.
  • RNA sequencing was performed on the collected samples to analyze gene expression profiles.
  • Pathway analysis was conducted to interpret the functional implications of observed transcriptional differences.

Main Results:

  • No significant transcriptional differences were found between Brodmann Areas (BAs) within the sgACC.
  • Striking and consistent differences in transcript expression were identified between Layer 3 and Layer 5 (L5a/L5b) across sgACC BAs.
  • Layer 5 sublayers (L5a and L5b) exhibited similar transcriptional profiles.
  • Pathway analysis revealed overlapping synaptic function processes but distinct enrichments: Layer 3 for cell-cell junctions and dendritic spines, Layer 5 for brain development and presynaptic function.

Conclusions:

  • Cortical layers within the human sgACC display distinct transcriptional profiles, particularly between Layer 3 and Layer 5.
  • These layer-specific transcriptional differences suggest potential functional specializations within the sgACC.
  • The study provides a foundational understanding of the normative transcriptional landscape of the sgACC.