Rethinking Nucleolar Evolution: New Insights into Structure and Function

The nucleolus, earlier considered a ribosome production site, presently recognized as a dynamic center that influences all aspects of cell genome composition, from stress effects to the aging process. The nucleolus generally exists in eukaryotic cells; however, recent research provides evidence of nucleolus-like structures in some prokaryotes, indicating an ancient origin for nucleolus-related functions. This review explores the evolutionary aspect of the nucleolus and evaluates its structural and functional diversity among primary to developed organisms. The proteins in the nucleolus serve a vital role in ribosome biogenesis and also in cell-cycle regulation, DNA repair, and cellular stress, directly linking its activity to health and disease. The nucleolar dysfunction implicated in ribosomal pathology, neural dysfunction confirmed the nucleolus as a critical target for prospective therapeutic approaches. Thus, the nucleolus may be considered as a model for how cellular prospects can evolve to cater to complex biological functions. The presented review about the organization and function of the nucleolus can suggest new insights about basic concepts that conduct cellular organization.