CSGALNACT1 (Chondroitin Sulfate N-Acetylgalactosaminyltransferase 1): CSGALNACT1 is a gene that plays a crucial role in the biosynthesis of chondroitin sulfate, a key component of the extracellular matrix in cartilage. It is essential for cartilage development and proper joint function, and alterations in its activity have been associated with skeletal disorders and joint diseases.