Bdf1p deletion affects mitochondrial function and causes apoptotic cell death under salt stress

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• The Saccharomyces cerevisiae BDF1 gene encodes a bromodomain-containing transcription factor.
• Previous studies showed Bdf1p deletion increases sensitivity to NaCl stress.

Purpose of the Study:

• To investigate the role of Bdf1p in salt tolerance beyond known stress-response pathways.
• To elucidate the specific mechanisms by which Bdf1p influences cellular responses to NaCl stress.

Main Methods:

• Deletion of the BDF1 gene in yeast.
• Assessment of salt tolerance.
• Analysis of mitochondrial membrane potential (Delta Psi) and reactive oxygen species (ROS) accumulation.
• Chromatin integrity analysis.

Main Results:

• Bdf1p's function in salt tolerance is independent of the Ena1p-mediated Na(+) extrusion system and other known stress pathways.
• Absence of Bdf1p under NaCl stress leads to mitochondrial dysfunction, including decreased mitochondrial membrane potential and increased ROS.
• NaCl stress in Bdf1p-deficient cells results in chromatin fragmentation and condensation.

Conclusions:

• Bdf1p plays a significant role in maintaining cellular homeostasis under salt stress.
• Mitochondrial dysfunction and chromatin alterations are key consequences of Bdf1p loss during NaCl stress.
• The bromodomain-containing protein Bdf1p is implicated in the regulation of apoptosis in yeast cells.