TCTN2 is a member of the Tectonic protein family. Tectonic proteins are transmembrane proteins that regulate the Hedgehog (Hh)-signaling pathway. Defects in TCTN2 can lead to Meckel syndrome type 8. This disorder is characterized by a combination of renal cysts and variable associated features which includes developmental anomalies of the central nervous system, hepatic ductal dysplasia and cysts, and polydactyly.