The AmAZI1ng Roles of Centriolar Satellites during Development

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The precise trafficking and spatial organization of signaling molecules within cells is critical for many fundamental cellular processes. Two interconnected microtubule-based organelles, the centrosome and primary cilium, have been making headlines recently due to their role as central “hubs” for coordinating such signaling events. The centrosome is the major microtubule-nucleating center in animal cells, which polarizes microtubule arrays and thereby directs microtubule-based trafficking toward itself and its associated structure, the primary cilium. [1]. The primary cilium is a tiny hair-like sensory organelle that is templated by one of two centrioles, core elements of the centrosome, and protrudes above the apical surface of almost every cell in the human body (Figure 1). Together, the centrosome and cilium mediate the initiation and transmission of extracellular signals to the interior of the cell, thus controlling many aspects of cell physiology [2], [3]. Defects in the structure and/or function of these organelles result in human disease conditions termed “ciliopathies,” a heterogeneous group of disorders with phenotypes including cystic kidneys; digit, bone, and brain anomalies; infertility; and even cancer [4], [5].