RPL27A encodes a structural component of the large ribosomal subunit, contributing to the ribosomal machinery responsible for protein synthesis 12. As a ribosomal protein, RPL27A participates in both translation and nucleolar integrity maintenance 3. The gene is located on human chromosome 11 and shares conserved exon-intron structure with its mouse homolog, featuring typical ribosomal protein gene regulatory elements including Sp1 binding sites 4. Clinically, RPL27A expression is significantly dysregulated in multiple cancers. In triple-negative breast cancer (TNBC), RPL27A is markedly upregulated in metastatic cancer cells and promotes cell migration and invasion through EIF2 signaling activation 5. Similarly, high RPL27A expression predicts poor prognosis in hepatocellular carcinoma (HCC) patients and serves as an independent prognostic predictor, with expression linked to TP53 mutations and immune infiltration 6. In Alzheimer's disease, RPL27A and other ribosomal proteins are specifically upregulated in brain capillaries, correlating with increased protein processing and N-glycosylation 7. In postmenopausal osteoporosis, RPL27A was identified as one of eight diagnostic biomarkers achieving high predictive accuracy (AUC 0.961) 8. At the mechanistic level, RPL27A downregulation by miR-595 inhibition induces p53-dependent apoptosis and blocks erythroid proliferation 3, while c-Myc transcriptional inhibition reduces RPL27A expression and suppresses HCC progression 9.