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