CFAP36 is a conserved ciliary protein that functions as an effector for the small GTPase ARL3, playing a critical role in ciliary protein homeostasis. Structurally, CFAP36 contains a BART-like domain and recognizes a specific LLxILxxL motif on ARL3's N-terminal amphipathic helix, facilitating interaction between these proteins 1. Mechanistically, CFAP36 acts as a cargo adaptor that binds polyubiquitinated proteins destined for ciliary export through a coincidence detection mechanism, simultaneously engaging two IFT subunits accessible only in retrograde intraflagellar transport trains 2. This coupling of ubiquitinated cargo to retrograde IFT is essential for ciliary protein retrieval and homeostasis. Depletion of CFAP36 causes pathological accumulation of K63-linked ubiquitin within cilia and disrupts hedgehog signaling, a developmental pathway critically dependent on the retrieval of ubiquitinated receptors 2. The protein's importance extends to reproductive biology, where CFAP36 shows differential transcript usage across mammalian oocyte maturation stages, suggesting roles in cell-cycle regulation during oogenesis 3. These findings establish CFAP36 as a central regulator of ubiquitin-mediated ciliary protein transport, with implications for understanding ciliopathies and developmental signaling disorders.