Function
TNIK (Traf2- and Nck-interacting kinase) is a serine/threonine kinase that plays a pivotal role as an activator of the Wnt signaling pathway. It is recruited to promoters of Wnt target genes and is essential for activating their expression. TNIK is thought to mediate this activation by phosphorylating TCF4/TCF7L2. Additionally, it appears to function upstream of the JUN N-terminal pathway. TNIK may be involved in the cellular response to environmental stress. It is part of a signaling complex composed of NEDD4, RAP2A, and TNIK that regulates neuronal dendrite extension and arborization during development. More broadly, TNIK may participate in cytoskeletal rearrangements and regulate cell spreading. It also phosphorylates SMAD1 on Thr-322.