Truncating PKHD1 and PKD2 mutations alter energy metabolism

Area of Science:

• Biochemistry
• Cell Biology
• Genetics

Background:

• Polycystin 1 deficiency impacts cellular energy metabolism.
• Autosomal recessive and dominant polycystic kidney diseases (PKDs) are linked to mutations in PKHD1 and PKD2 genes.

Purpose of the Study:

• To investigate if mutations in PKHD1 and PKD2 genes affect cellular energy metabolism similarly to polycystin 1 deficiency.
• To analyze extracellular acidification and glucose metabolism in kidney cyst cell models.

Main Methods:

• Utilized human embryonic kidney (HEK-293) cell lines with PKHD1 and PKD2 truncating mutations.
• Measured extracellular acidification rates and oxygen consumption.
• Assessed mitochondrial morphology.

Main Results:

• PKHD1 and PKD2 mutations increased extracellular acidification and oxygen consumption rates.
• PKHD1 mutations specifically elevated nonglycolytic acidification, suggesting increased TCA cycle or glycogenolysis.
• Mutations altered mitochondrial morphology, mimicking polycystin 1 deficiency effects.

Conclusions:

• Defects in major PKD genes (PKHD1, PKD2) induce significant changes in mitochondrial energy metabolism.
• These findings suggest potential therapeutic benefits of targeting energy metabolism in PKD treatment.
• Further in vivo validation is warranted to confirm these observations.