Disentangling glial diversity in peripheral nerves at single-nuclei resolution

Area of Science:

• Neuroscience
• Cell Biology
• Genomics

Background:

• Peripheral nerves comprise diverse cell types crucial for function.
• Conventional single-cell methods face challenges with complex cell morphologies.

Purpose of the Study:

• To create a comprehensive peripheral nerve cell atlas using single-nuclei RNA sequencing.
• To identify and characterize distinct cell subtypes, particularly Schwann cells.
• To investigate potential changes in cell populations in amyotrophic lateral sclerosis (ALS).

Main Methods:

• Single-nuclei RNA sequencing of multiple peripheral nerves.
• Bioinformatic analysis to identify cell types and subtypes.
• Comparative analysis between healthy and disease models.

Main Results:

• A detailed mouse peripheral nerve cell atlas was generated, revealing diverse cell populations.
• Multiple Schwann cell (SC) subtypes were identified, including a novel myelinating SC subtype.
• This distinct SC subtype expresses Cldn14, Adamtsl1, and Pmp2, and ensheathes motor axons.
• The number of Pmp2+ SCs was significantly reduced in an ALS mouse model (SOD1G93A) and human ALS nerve samples.

Conclusions:

• The study highlights the cellular diversity within peripheral nerves, including SC subtypes.
• A specific motor axon-associated SC subtype was identified.
• Reduced numbers of these SCs in ALS suggest a potential role in disease pathogenesis.
• The generated atlas serves as a valuable resource for future peripheral nerve research and disease studies.