RUNX1 Upregulation Causes Mitochondrial Dysfunction via Regulating the PI3K-Akt Pathway in iPSC from Patients with...

Area of Science:

• Genetics and Molecular Biology
• Cell Biology
• Developmental Biology

Background:

• Down syndrome (DS) is linked to mitochondrial dysfunction and nervous system abnormalities.
• The RUNX1 gene, located on chromosome 21, is implicated in apoptosis via the mitochondrial pathway.

Purpose of the Study:

• To investigate the role of RUNX1 in mitochondrial dysfunction in DS.
• To explore the underlying mechanisms of RUNX1's effect on mitochondrial function in DS.

Main Methods:

• Detected RUNX1 expression in DS-induced pluripotent stem cells (DS-iPSCs) and normal iPSCs (N-iPSCs).
• Assessed mitochondrial functions (ROS, membrane potential, ATP, lysosomal activity) after manipulating RUNX1 levels.
• Utilized RNA-sequencing for global gene expression analysis.

Main Results:

• DS-iPSCs showed significantly higher RUNX1 expression and impaired mitochondrial function compared to controls.
• Overexpressing RUNX1 in N-iPSCs induced mitochondrial dysfunction.
• Inhibiting RUNX1 in DS-iPSCs ameliorated mitochondrial dysfunction.

Conclusions:

• Abnormal RUNX1 expression is critical for mitochondrial dysfunction in DS.
• RUNX1 may promote apoptosis in DS via the PI3K/Akt pathway.
• Targeting RUNX1 could be a therapeutic strategy for DS-related mitochondrial issues.