ODAD3 (outer dynein arm docking complex subunit 3) is a core component of the outer dynein arm-docking complex (ODA-DC) that mediates the assembly and attachment of outer dynein arms (ODAs) to doublet microtubules in ciliary axonemes 1. ODAD3 functions as a critical scaffolding protein essential for both ODA assembly and proper docking complex formation onto ciliary microtubules 1. At the molecular level, ODAD3 physically interacts with other ODA-docking machinery components including LRRC56, and this interaction controls the deployment of dyneins to the distal axoneme 2. Disease-associated variants in ODAD3 disrupt its localization and interaction with binding partners like LRRC56, resulting in selective depletion of ODAs from distal ciliary regions 2. ODAD3 mutations cause primary ciliary dyskinesia (PCD), a genetically heterogeneous motile ciliopathy characterized by impaired ciliary function, chr19 respiratory disease, laterality defects, and infertility 2. The clinical significance of ODAD3 is underscored by its essential role in generating the mechanical forces necessary for proper ciliary beating and mucociliary clearance in respiratory epithelia 3. Loss of functional ODAD3 leads to characteristic ultrastructural defects including absent or severely reduced ODAs visible on transmission electron microscopy, distinguishing ODAD3-related PCD from other genetic forms of ciliary dyskinesia.