Abstract
Mitochondrial morphology and function are crucial for tissue homeostasis, such as for skeletal development, but the cellular and molecular mechanisms remain unclear. Here, we provide evidence that regulator of G-protein signaling 12 (RGS12) is present in the mitochondria of primary chondrocytes and cartilage tissues. Deletion of RGS12 in type II collagen-positive cells led to a significant decrease in mitochondrial number, membrane potential, and oxidative phosphorylation function. Mechanistically, RGS12 promoted the function of ATP5A as an enhancer of tyrosine phosphorylation. Mice with RGS12 deficiency in the chondrocyte lineage showed serious body retardation, decreased bone mass, and chondrocyte apoptosis due to the defective activity of ATP synthase. To our knowledge, this is the first report that RGS12 is required for maintaining the function of mitochondria, which may allow it to orchestrate responses to cellular homeostasis.