Knocking Down FRMD4A, a Factor Associated with the Brain Development Disorder and a Risk Factor for Alzheimer's...

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Genetic mutations in FRMD4A are linked to developmental brain disorders and Alzheimer's disease.
• FRMD4A and FRMD4B are FERM domain proteins potentially involved in cell morphogenesis and polarization in the central nervous system.
• The precise roles of FRMD4A and FRMD4B in neuronal morphogenesis remain largely uncharacterized.

Purpose of the Study:

• To investigate the function of FRMD4A and FRMD4B in neuronal process elongation.
• To explore the potential of hesperetin in restoring normal neuronal morphology when FRMD4A/FRMD4B are impaired.

Main Methods:

• Knockdown of Frmd4a and Frmd4b using CRISPR-Cas13 technology in primary cortical neurons and N1E-115 neuronal cell lines.
• Assessment of neuronal process elongation and marker expression.
• Treatment with hesperetin to evaluate its effect on neuronal morphology and MAPK/ERK signaling.

Main Results:

• Knockdown of Frmd4a or Frmd4b significantly reduced process elongation in neuronal cells.
• Hesperetin treatment rescued the decreased process elongation caused by Frmd4a/Frmd4b knockdown.
• Hesperetin stimulated MAPK/ERK phosphorylation, suggesting a role in promoting neuronal processes.

Conclusions:

• FRMD4A and FRMD4B play critical roles in regulating neuronal process elongation.
• Hesperetin demonstrates potential in restoring normal neuronal phenotypes by modulating MAPK/ERK signaling pathways.
• These findings highlight FRMD4A/FRMD4B and hesperetin as potential targets for treating neurodevelopmental disorders.