MicroRNAs: newcomers into the ALS picture

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease affecting motor neurons, leading to progressive muscle impairment and death.
• ALS etiology is complex, involving non-cell-autonomous mechanisms with contributions from various non-neuronal cells.
• Genetic mutations in genes like C9ORF72, SOD1, FUS/TLS, and TDP43 are linked to familial ALS, while sporadic forms exist without known mutations.

Purpose of the Study:

• To review the emerging role of microRNAs (miRNAs) in the pathogenesis of amyotrophic lateral sclerosis (ALS).
• To explore how miRNA dysregulation contributes to ALS-related neuroinflammation and neurodegeneration.
• To highlight the potential of miRNAs as therapeutic targets for novel neuroprotective agents against ALS.

Main Methods:

• Review of existing literature on miRNA biogenesis, function, and their involvement in ALS.
• Analysis of the impact of miRNA dysregulation on cellular and molecular pathways in ALS.
• Examination of mechanistic insights into miRNAs for developing new therapeutic strategies.

Main Results:

• MicroRNAs (miRNAs) are fine regulators of gene expression, with over 20-30% of human protein-coding genes potentially controlled by them.
• Mutated proteins TDP43 and FUS/TLS, implicated in ALS, are involved in miRNA biogenesis, suggesting a role for miRNA dysregulation in the disease.
• Dysregulated miRNAs contribute to neuroinflammation and neurodegeneration pathways observed in ALS.

Conclusions:

• MicroRNA (miRNA) dysregulation plays a significant role in the molecular mechanisms underlying amyotrophic lateral sclerosis (ALS).
• Understanding these miRNA mechanisms provides a basis for developing novel miRNA-based neuroprotective therapies for ALS.
• Further comparative studies on neuroinflammatory and neurodegenerative mechanisms involving miRNAs promise broader impact on ALS treatment strategies.