Conserved Cell Type Signatures Across the Brainstem and Spinal Cord in the Mouse Central Nervous System

Area of Science:

• Neuroscience
• Genomics
• Molecular Biology

Background:

• Understanding cell type organization is crucial for deciphering central nervous system (CNS) function.
• The brainstem and spinal cord share organizational principles yet exhibit regional specializations.

Purpose of the Study:

• To map conserved cell type signatures and molecular architecture in the adult mouse brainstem and spinal cord.
• To investigate the interplay between cell-type identity and positional identity across CNS regions.

Main Methods:

• Integration of single-nucleus Multiome (RNA+ATAC) sequencing and spatial transcriptomics.
• Computational analyses to identify shared and region-specific cell types and regulatory programs.
• Chromatin accessibility profiling to uncover cell-type-specific regulatory elements and transcription factor roles.

Main Results:

• Identification of a shared core of neuronal and non-neuronal cell types across the brainstem and spinal cord.
• Discovery of conserved cellular niches and a continuous organizational logic at the brainstem-spinal cord boundary.
• Demonstration that cell-type and positional identities are largely orthogonal, with motor neurons showing strong positional coupling, unlike interneurons.

Conclusions:

• The study provides a comprehensive reference for the shared molecular architecture of the brainstem and spinal cord.
• Findings reveal conserved gene expression modules and signaling programs underlying shared circuit features.
• The orthogonal relationship between cell-type and positional identity offers insights into CNS development and organization.