CDKL4 is a serine/threonine kinase with emerging roles in ciliary structure and potentially in stress-responsive behavioral regulation. Primary function involves regulation of ciliary architecture, specifically in controlling proximal segment length through interaction with intraflagellar transport (IFT) machinery 1. CDKL4 associates with IFT motors (kinesin-II and KIF17) and influences the positioning of the proximal-distal segment boundary, functions independent of other known ciliary length regulators 1. This structural role is essential for cilium-dependent sensory processes, including cGMP signaling and chemotaxis 1. Beyond ciliary function, CDKL4 has clinical relevance in colorectal cancer; increased copy number of CDKL4 is associated with elevated recurrence and mortality risks in stage III CRC patients receiving oxaliplatin-based adjuvant chemotherapy, with predictive models achieving AUC of 0.77-0.82 for outcome prediction 2. Additionally, CDKL4 expression patterns correlate with behavioral responsiveness to acute stress in rat brain regions including hippocampus, amygdala, and frontal cortex, suggesting involvement in stress-responsive phenotypes 3. The kinase thus bridges ciliary biology with potential roles in cancer chemotherapy response and neurobiological stress adaptation, though detailed molecular mechanisms in non-ciliary contexts require further investigation.