{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRPS26 is a critical ribosomal protein whose genetic alterations are tightly linked to Diamond–Blackfan anemia (DBA). Multiple studies have identified distinct point mutations and deletions in RPS26 that lead to abnormal pre‐rRNA processing—for example, an accumulation of the 18S‐E precursor—in DBA patients. These observations underscore the pivotal role of RPS26 in ribosome assembly and early steps of rRNA maturation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDuring the final maturation of pre‐40S ribosomal subunits, RPS26 plays an essential role by cooperating with factors such as the ATPase RIO1 to displace the rRNA–binding protein DIM2, thereby triggering precise cleavage of the 18S rRNA by NOB1. Furthermore, the intact C‐terminal region of RPS26 is indispensable for its proper association with nucleophosmin—a multifunctional chaperone that contributes to nuclear export—thus ensuring the production of translation‐competent ribosomes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond ribosome biogenesis, RPS26 exerts regulatory functions in cellular stress responses. Its depletion has been shown to stabilize and activate p53 via an RPL11‐dependent mechanism, while also impairing the transcriptional activation of p53 target genes in response to DNA damage. In addition, RPS26 can directly interact with Mdm2 to reduce p53 ubiquitination, highlighting a multifaceted role in the regulation of cell cycle and the maintenance of genomic integrity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nRPS26 also participates in the regulation of its own pre-mRNA splicing. Experimental data demonstrate that the protein binds specifically to intronic regions of its pre-mRNA, thereby modulating splice site selection and suppressing alternative splicing events. Such an autoregulatory mechanism appears to be crucial for maintaining proper RPS26 levels in the cell."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAs a structural component of the small ribosomal subunit, RPS26 is integral to the formation of the mRNA binding channel. In particular, a eukaryote-specific motif in RPS26 mediates interactions with mRNA near the exit site, which may influence the selective translation of specific transcripts and contribute to the fine-tuning of protein synthesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, emerging genetic association studies point to broader roles for RPS26 in human diseases beyond ribosomopathies. Preliminary evidence has linked altered RPS26 expression or specific polymorphisms with endocrine disorders, including polycystic ovary syndrome and various forms of diabetes, suggesting a potential pleiotropic function that may extend to metabolic regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Leana Doherty, Mee Rie Sheen, Adrianna Vlachos, et al. 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