ZNF606 interacts with Sox9 to regulate chondrocyte differentiation.

SRY-related high-mobility-group box 9 (Sox9) gene is a transcription factor that plays an essential role in chondrocyte differentiation and cartilage formation. In this study, we identified the transcriptional factor ZNF606 as an interacting partner for Sox9 in cells. We further demonstrated that overexpression of ZNF606 inhibited the transcriptional activity of Sox9, while knockdown of ZNF606 increased Sox9-mediated transcription. Chromatin immunoprecipitation analysis revealed that ZNF606 prevents Sox9 binding to the enhancers of its target gene col2a1. Importantly, the interaction between ZNF606 and Sox9 was decreased during chondrocyte differentiation. Consistent with these findings, ZNF606 inhibited chondrocyte differentiation. Thus, our results demonstrate that ZNF606 acts as a novel Sox9 co-regulator that inhibits Sox9-mediated chondrocyte differentiation.

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