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The kizuna centrosomal protein, known by the gene symbol KIZ or C2orf39, is an important protein associated with the centrosome in cells. The centrosome is a key cellular structure that plays a crucial role in organizing microtubules and is critical for the process of cell division (mitosis). Kizuna is particularly vital during the mitotic phase, where it helps maintain the integrity of the centrosome and ensures proper mitotic spindle formation.This protein was dubbed "kizuna" because the term means "bonds" in Japanese, reflecting its function in maintaining the cohesive structure of the centrosome during the stressful conditions of cell division. Just as kizuna signifies strong social bonds or ties between people, the kizuna protein helps maintain the structural cohesion between centrioles, the cylindrical structures that comprise the centrosome.

Mutations or dysfunctions in the KIZ gene or the kizuna protein can lead to errors in cell division, which may have implications for various diseases, including cancer, where cell division becomes unregulated. Additionally, proper centrosomal function is crucial for the development and maintenance of organismal complexity, so alterations in proteins like kizuna can have significant developmental consequences.Kizuna's role extends beyond simply holding the centrosome together; it is also involved in the recruitment of other proteins to the centrosome and can influence the timing of cell cycle progression.