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Polo-like kinase 5 (PLK5) is a member of the Polo-like kinase family, notable for its involvement in cell cycle regulation processes such as mitotic entry, spindle formation, and cytoplasmic division. PLK5 is distinguished from other family members by its low expression levels, particularly within different immunophenotypes, except for being notably elevated in the C5 subtype. Its expression has been linked to poor prognosis in non-small cell lung cancer, although this is not universally supported by all data sources, suggesting complex roles in tumor biology. In a mouse model, PLK5 functions as a DNA damage-inducible gene with nucleolar localization, facilitated by a specific nucleolus localization signal in its N-terminal. The protein's ectopic expression can lead to G1 phase arrest, indicating its role in cellular response to DNA damage. Research is ongoing to fully elucidate its function and prognostic implications across various cancer types.
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