Cell-Type-Dependent Recruitment Dynamics of FUS Protein at Laser-Induced DNA Damage Sites

Area of Science:

• Molecular Biology
• Cell Biology
• Neuroscience

Background:

• DNA damage accumulation is linked to aging and neurodegenerative diseases.
• Fused in sarcoma (FUS) protein participates in DNA repair pathways and its mutations cause amyotrophic lateral sclerosis (ALS).
• ALS-associated FUS mutations impair DNA damage repair, suggesting cell-type-specific vulnerabilities.

Purpose of the Study:

• To investigate whether FUS protein recruitment dynamics to DNA damage sites differ across various human cell types.
• To explore the role of cell type in FUS-mediated DNA damage response and repair.

Main Methods:

• Generated engineered human induced pluripotent stem cells (hiPSCs) expressing wild-type FUS fused to eGFP.
• Utilized laser micro-irradiation to induce localized DNA damage.
• Developed a workflow to analyze real-time FUS recruitment dynamics at DNA damage sites in different cell derivatives.

Main Results:

• FUS-eGFP recruitment to DNA damage sites was observed in most cell types studied.
• Human induced pluripotent stem cells (hiPSCs) showed reduced FUS recruitment, with only 70% of cells exhibiting this response.
• Kinetics of FUS recruitment varied significantly among different cell types following laser-induced DNA damage.

Conclusions:

• FUS protein exhibits cell-type-dependent recruitment behavior during the DNA damage response and repair process.
• The developed real-time analysis workflow is a valuable tool for studying protein dynamics at DNA damage sites.
• Findings contribute to understanding cell-type-specific mechanisms in DNA repair and neurodegeneration.