FUS-dependent microRNA deregulations identify TRIB2 as a druggable target for ALS motor neurons

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• MicroRNAs (miRNAs) are crucial regulators of gene expression, and their dysregulation is implicated in diseases like amyotrophic lateral sclerosis (ALS).
• The Fused in Sarcoma (FUS) gene is a known causal factor in ALS and influences miRNA production, making it a key area of investigation.

Purpose of the Study:

• To systematically analyze miRNA expression profiles in the central nervous system (CNS) of ALS-FUS mice.
• To elucidate the role of FUS-dependent miRNA deregulation in ALS pathogenesis.
• To identify potential therapeutic targets for ALS.

Main Methods:

• miRNA profiling of spinal cord and hippocampal tissues from ALS-FUS mice.
• Analysis of miRNA expression across different CNS regions and disease states.
• Investigating the targeting relationship between miR-1197 and Trib2.
• Assessing Trib2 expression in patient-derived cells and evaluating therapeutic interventions.

Main Results:

• Differentially expressed miRNAs were identified between CNS regions and disease states in ALS-FUS mice.
• miR-1197 was found to be upregulated and targets the pro-survival gene Trib2.
• Reduced Trib2 expression was observed in induced pluripotent stem cell (iPSC)-derived motor neurons from ALS patients.
• Pharmacological stabilization of Trib2 protein rescued motor neuron survival in vitro.

Conclusions:

• miRNA profiling is a valuable tool for understanding the molecular mechanisms of selective vulnerability in ALS.
• Trib2 represents a promising therapeutic target for ALS treatment.
• Restoring Trib2 function may offer a viable therapeutic strategy for ALS, including sporadic forms.