CLNS1A regulates genome stability and cell cycle progression to control CD4 T cell function and autoimmunity

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• Pathogenic CD4 T cells are central drivers of autoimmune diseases like multiple sclerosis (MS) and inflammatory bowel disease (IBD).
• Understanding the molecular mechanisms regulating these pathogenic T cells is critical for developing novel therapeutic strategies.

Purpose of the Study:

• To identify key regulators of inflammation in pathogenic CD4 T cells.
• To elucidate the role of chloride nucleotide-sensitive channel 1A (CLNS1A) in T cell function and autoimmunity.

Main Methods:

• Forward genetic screen in the experimental autoimmune encephalomyelitis (EAE) model.
• Genetic deletion of CLNS1A in T cells.
• Analysis of T cell proliferation, DNA damage, cell cycle, and effector functions.
• Investigation of CLNS1A interaction with protein arginine methyl transferase 5 (PRMT5).
• Assessment of histone modifications and gene expression related to DNA repair and cell cycle.

Main Results:

• CLNS1A was identified as a key regulator of inflammation in the EAE model.
• CLNS1A is expressed in pathogenic T helper 17 (pT_H17) cells.
• T cell-specific deletion of CLNS1A led to DNA damage, cell cycle arrest, and impaired T cell function.
• Mice lacking CLNS1A in T cells were protected from EAE and IBD.
• CLNS1A interacts with PRMT5 and regulates symmetric histone dimethylation.
• CLNS1A controls the expression of genes involved in DNA repair, replication, and cell cycle.

Conclusions:

• CLNS1A is essential for the function and survival of pathogenic CD4 T cells.
• CLNS1A promotes genome stability and cell cycle progression in T cells.
• Targeting CLNS1A represents a potential therapeutic strategy for autoimmune diseases.