A transcriptomic atlas of mouse neocortical layers

Area of Science:

• Neuroscience
• Genomics
• Transcriptomics

Background:

• The mammalian cortex exhibits a layered structure crucial for cognitive functions.
• Understanding the molecular basis of this layered organization is essential.

Purpose of the Study:

• To comprehensively map the transcriptomes of individual cortical layers (1-6b) in the mouse somatosensory cortex.
• To identify differentially expressed protein-coding and noncoding genes across these layers.
• To associate specific functional and disease annotations with each cortical layer.

Main Methods:

• RNA sequencing of transcriptomes from adult mouse somatosensory cortex layers 1-6b.
• Application of a naive Bayes machine-learning model to identify "patterned" gene expression.
• Genome-wide analysis of coding and noncoding loci.

Main Results:

• Identified 5,835 protein-coding genes and 66 noncoding RNA loci with differential expression across cortical layers.
• Each layer (2-6b) demonstrated unique functional and disease-related gene expression profiles.
• Discovered candidate alternatively spliced transcripts with layer-specific expression patterns.

Conclusions:

• The study provides a high-resolution transcriptomic map of the mouse somatosensory cortex layers.
• This resource enhances understanding of the biological roles and functional specialization of cortical layers.
• The findings offer valuable insights into the genetic underpinnings of cortical cytoarchitecture and cognition.