Granules Gone Rogue: Nuclear and Cytoplasmic Ribonucleoprotein Structures in Amyotrophic Lateral Sclerosis-Fused in...

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease with genetic subtypes.
• Mutations in the fused in sarcoma (FUS) gene are linked to aggressive ALS with early onset and rapid progression.
• FUS protein regulates DNA/RNA metabolism and forms ribonucleoprotein (RNP) granules.

Purpose of the Study:

• To review the role of FUS in regulating RNP granule dynamics under physiological and pathological conditions.
• To explore how FUS mutations disrupt subcellular localization and RNP granule function in ALS.
• To discuss therapeutic strategies targeting FUS pathology and RNP granule dysregulation.

Main Methods:

• Literature review of studies on FUS, ALS, and RNP granule dynamics.
• Analysis of FUS protein function, mutation effects, and cellular mechanisms.
• Synthesis of information on therapeutic interventions for FUS-related ALS.

Main Results:

• Pathogenic FUS mutations lead to cytoplasmic mislocalization and aggregation, disrupting stress granules and paraspeckles.
• Loss of nuclear FUS function elevates NEAT1 lncRNA and alters paraspeckle assembly.
• Impaired nucleocytoplasmic transport and RNP granule dynamics increase motor neuron vulnerability.
• FUS interactions with other proteins suggest common ALS disease mechanisms.

Conclusions:

• FUS-mediated RNP granule regulation is critical for cellular resilience in motor neurons.
• Dysregulation of FUS and RNP granules contributes significantly to ALS pathogenesis.
• Targeting FUS pathology and RNP granule dynamics offers promising therapeutic avenues for ALS.