SOX5 Gene - SRY-Box Transcription Factor 5: Function, Mutations, and Disease Associations

SOX5 encodes a member of the SOX (SRY-related HMG-box) family of transcription factors, characterized by a conserved high-mobility group (HMG) DNA-binding domain. SOX5 plays critical roles in embryonic development, particularly in chondrogenesis (cartilage formation) and neurogenesis. It acts as a transcriptional activator or repressor depending on context and partner proteins. Mutations in SOX5 are associated with Lamb-Shaffer syndrome (LAMSHF), a neurodevelopmental disorder characterized by intellectual disability, speech delay, and facial dysmorphism. SOX5 is also implicated in several cancers, including glioblastoma and melanoma, where it can promote tumor progression.

Tissue Expression

Cell Line Expression

Hotspot Mutations

Mutation functional classification

• Chondrogenesis and skeletal development (Reactome: R-HSA-5619507)

• SOX-mediated regulation of neural crest cell migration (Reactome: R-HSA-5619508)

• Transcriptional regulation by SOX5 in glioblastoma (KEGG: hsa05214)

• Melanogenesis and MITF regulation (KEGG: hsa04916)

SOX5 is a 763-amino acid transcription factor containing an N-terminal HMG box DNA-binding domain, a coiled-coil dimerization domain, and a C-terminal transactivation domain. It binds DNA as a monomer or dimer and interacts with partner transcription factors (e.g., SOX6, SOX9) to regulate target genes. SOX5 is essential for chondrogenesis, where it cooperates with SOX6 and SOX9 to activate collagen type II and aggrecan expression. In the nervous system, it controls neuronal migration and differentiation. Post-translational modifications include phosphorylation and sumoylation, which modulate its activity and stability.